Access profile

The natural route for entering the doctoral programme is for students who have competed and passed the master's degree in Structural and Construction Engineering at the UPC (MEEC-UPC). Students who have taken other master’s degrees must show that they have basic knowledge of the main subjects in construction technology, that is: structural concrete, metal and mixed structures, construction materials, durability, maintenance and management of structures and civil works. Students should have some knowledge of programming and software packages for the analysis and calculation of the structures.

Output profile

Doctoral candidates who complete a doctoral degree will have acquired the following competencies, which are needed to carry out quality research (Royal Decree 99/2011, of 28 January, which regulates official doctoral studies):

a) A systematic understanding of the field of study and a mastery of the research skills and methods related to the field.
b) An ability to conceive, design or create, put into practice and adopt a substantial process of research or creation.
c) An ability to contribute to pushing back the frontiers of knowledge through original research.
d) A capacity for critical analysis and an ability to assess and summarise new and complex ideas.
e) An ability to communicate with the academic and scientific community and with society in general as regards their fields of knowledge in the manner and languages that are typical of the international scientific community to which they belong.
f) An ability to foster scientific, technological, social, artistic and cultural progress in academic and professional contexts within a knowledge-based society.

The award of a doctoral degree must equip the graduate for work in a variety of settings, especially those requiring creativity and innovation. Doctoral graduates must have at least acquired the personal skills needed to:

a) Develop in contexts in which there is little specific information.
b) Find the key questions that must be answered to solve a complex problem.
c) Design, create, develop and undertake original, innovative projects in their field.
d) Work as part of a team and independently in an international or multidisciplinary context.
e) Integrate knowledge, deal with complexity and make judgements with limited information.
f) Offer criticism on and intellectually defend solutions.

Finally, with respect to competencies, doctoral students must:
a) have acquired advanced knowledge at the frontier of their discipline and demonstrated, in the context of internationally recognised scientific research, a deep, detailed and well-grounded understanding of theoretical and practical issues and scientific methodology in one or more research fields;
b) have made an original and significant contribution to scientific research in their field of expertise that has been recognised as such by the international scientific community;
c) have demonstrated that they are capable of designing a research project that serves as a framework for carrying out a critical analysis and assessment of imprecise situations, in which they are able to apply their contributions, expertise and working method to synthesise new and complex ideas that yield a deeper knowledge of the research context in which they work;
d) have developed sufficient autonomy to set up, manage and lead innovative research teams and projects and scientific collaborations (both national and international) within their subject area, in multidisciplinary contexts and, where appropriate, with a substantial element of knowledge transfer;
e) have demonstrated that they are able to carry out their research activity in a socially responsible manner and with scientific integrity;
f) have demonstrated, within their specific scientific context, that they are able to make cultural, social or technological advances and promote innovation in all areas within a knowledge-based society;
g) have demonstrated that they are able to participate in scientific discussions at the international level in their field of expertise and disseminate the results of their research activity to audiences of all kinds.

Number of places

20

Duration of studies and dedication regime

Duration
The maximum period of study for full-time doctoral studies is three years, counted from the date of admission to the programme to the date of submission of the doctoral thesis. The academic committee of the doctoral programme may authorise a doctoral candidate to pursue doctoral studies on a part-time basis. In this case, the maximum period of study is five years, counting from the date of admission to the programme to the date of submission of the doctoral thesis. For calculating these periods, the date of admission is considered to be the date of the first enrolment for tutorials, and the date of submission the moment in which the Doctoral School officially deposits the doctoral thesis.

For full-time doctoral candidates, the minimum period of study is two years, counted from the date of an applicant's admission to the programme until the date on which the doctoral thesis is deposited; for part-time doctoral candidates it is four years. When there are justified grounds for doing so, and the thesis supervisor and academic tutor have given their authorisation, doctoral candidates may request that the academic committee of their doctoral programme exempt them from the minimum period of study requirement.

The calculation of periods of study will not include periods of absence due to illness, pregnancy or any other reason provided for in the regulations in force. Students who find themselves in any of these circumstances must notify the academic committee of the doctoral programme, which, where appropriate, must inform the Doctoral School. Doctoral candidates may also temporarily withdraw from the programme for up to one year, and this period may be extended for an additional year. Doctoral candidates who wish to interrupt their studies must submit a justified request to the academic committee of the doctoral programme, which will decide whether or not to approve the request. Each programme will establish conditions for readmission to doctoral studies.

Extension
If full-time doctoral candidates have not applied to deposit their thesis by the end of the three-year period of study, the academic committee of the programme may authorise an extension of up to one year. In exceptional circumstances, a further one-year extension may be granted, subject to the conditions established by the corresponding doctoral programme. In the case of part-time doctoral candidates, an extension of two years may be authorised. In both cases, in exceptional circumstances a further one-year extension may be granted by the Doctoral School's Standing Committee, upon the submission of a reasoned application by the academic committee of the doctoral programme.

Dismissal from the doctoral programme
A doctoral candidate may be dismissed from a doctoral programme for the following reasons:

• The doctoral candidate submitting a justified application to withdraw from the programme.
• The maximum period of study and of extensions thereof ending.
• The doctoral candidate not having enrolled every academic year (unless he or she has been authorised to temporarily withdraw).
• The doctoral candidate failing two consecutive assessments.
• The doctoral candidate having disciplinary proceedings filed against him or her that rule that he or she must be dismissed from the UPC.

Dismissal from the programme implies that doctoral candidates cannot continue studying at the UPC and the closing of their academic record. This notwithstanding, they may apply to the academic committee of the programme for readmission and the committee must reevaluate them in accordance with the criteria established in the regulations.

Enrollment aid

The programme does not have specific grants available for the enrolment fee.

Organization

• Casas Rius, Joan Ramon

• Casals Casanova, Miquel
• Casas Rius, Joan Ramon
• Etxeberria Larrañaga, Miren
• Oller Ibars, Eva
• Roca Fabregat, Pedro

• Department of Civil and Environmental Engineering (PROMOTORA)
• Department of Project and Construction Engineering

Office 202 – Building C2 (North Campus)
Tel.: (+34) 934 016 497
E-mail: doctorat.ECO.camins@upc.edu

Agreements with other institutions

Access profile

The natural route for entering the doctoral programme is for students who have competed and passed the master's degree in Structural and Construction Engineering at the UPC (MEEC-UPC). Students who have taken other master’s degrees must show that they have basic knowledge of the main subjects in construction technology, that is: structural concrete, metal and mixed structures, construction materials, durability, maintenance and management of structures and civil works. Students should have some knowledge of programming and software packages for the analysis and calculation of the structures.

Access requirements

Applicants must hold a Spanish bachelor’s degree or equivalent and a Spanish master’s degree or equivalent, provided they have completed a minimum of 300 ECTS credits on the two degrees (Royal Decree 43/2015, of 2 February)

In addition, the following may apply:

• Holders of an official degree awarded by a university in Spain or any other country in the European Higher Education Area, pursuant to the provisions of Article 16 of Royal Decree 1393/2007, of 29 October, which establishes official university course regulations, who have completed a minimum of 300 ECTS credits on official university degrees, of which at least 60 must be at the master's degree level.
• Holders of an official Spanish bachelor’s degree comprising at least 300 credits, as provided for by EU regulations. Holder of degrees of this kind must complete bridging courses unless the curriculum of the bachelor’s degree in question included research training credits equivalent in value to those which would be earned on a master's degree.
• Holders of an official university qualification who, having passed the entrance examination for specialised medical training, have completed at least two years of a training course leading to an official degree in a health-sciences specialisation.
• Holders of a degree issued under a foreign education system. In these cases, homologation is not required, but the UPC must verify that the degree certifies a level of training equivalent to an official Spanish master's degree and qualifies the holder for admission to doctoral studies in the country where it was issued. Admission on this basis does not imply homologation of the foreign degree or its recognition for any purpose other than admission to doctoral studies.
• Holders of a Spanish doctoral qualification issued under previous university regulations.

Note 1: Doctoral studies entrance regulations for holders of an undergraduate degree awarded before the introduction of the EHEA (CG 47/02 2014)

Note 2: Governing Council Decision 64/2014, which approves the procedure and criteria for assessing the fulfilment of academic admission requirements for doctoral studies by holders of non-homologated foreign degrees (CG 25/03 2014)

Admission criteria and merits assessment

Qualifications that provide direct access without the need for bridging courses include:

• master’s degree in Structural and Construction Engineering (MIEC-UPC)
• master’s degree in Civil Engineering
• master’s degree in Civil Engineering
• master’s degree in Industrial Engineering

The academic committee of the doctoral programme may recognise the equivalence of other masters of science (in the Bologna Process) or even other qualifications. To recognise equivalence, the committee will assess whether the qualification corresponds with the MIEC-UPC in terms of the number of credits and subjects that are covered, and the excellence of the academic institution in which the course was taught. Students who hold master’s degrees or other qualifications recognised as equivalent to the MIEC-UPC will be admitted automatically.

The admission of students who do not meet this criterion could be considered and analysed by the academic committee of the doctoral programme in Construction Engineering. In general, holding a master’s degree of an academic or scientific nature adapted to the guidelines of the Bologna Process will be an essential condition for access to the doctoral programme. In this case, the committee will decide whether to accept each applicant on an individual basis. The committee will assess the following aspects, according to the weighting indicated in brackets:

• The characteristics of previous studies (particularly the degree of equivalence with the master’s degree in Structural and Construction Engineering - scientific pathway) (25%).
• The grants and financial aid that have been awarded (5%).
• Academic record (20%).
• Possibility of supervision by lecturers in the department (30%).
• Previous research experience (15%).
• Language knowledge (5%).

Training complements

The academic committee for the programme may require that doctoral students pass specific bridging courses. In this case, it will monitor the bridging courses that are taken and establish appropriate criteria to limit their duration.

Bridging courses will be on research training. Doctoral students will never be required to enrol for bridging courses worth 60 ECTS or more.

The required bridging courses in methodological or scientific training could be established for each student by:

1. The academic committee, as an admission requirement or after admission as a condition for continuation to be completed within the time limit given below.
2. The tutor or the thesis supervisor, as a result of observing gaps in the student’s knowledge or performance.
3. The thesis supervisor, as a result of observing gaps in the student’s training or as an additional advanced training need in the topic(s) of the doctoral thesis.

The committee will establish the need for bridging course on admission. The tutor and the thesis supervisor could identify and establish the need for bridging courses during the first year.

The decision about which bridging courses a student must take is made by agreement between the tutor and the academic coordinators of the programme. This decision is then approved by the academic committee.

Bridging courses to take

The committee will establish the required credits and subjects in each case. In general, subjects will be selected from the UPC master's degree in Structural and Construction Engineering, when it is considered that students need to take these subjects to achieve a suitable initial level of knowledge. For each student, the committee can define two types of additional training:

1. Training requirements prior to entering the doctoral programme. Admission to the programme will depend on passing these subjects.

2. Requirements for training in methodology, research, oral and written communication techniques.

The deadline for completing this training is one-and-a-half years (18 months) when bridging courses are required by the academic committee as a condition for definitive admission. The committee could rule to discontinue the student if the required bridging courses have not been completed in the first 18 months.

Enrolment period for new doctoral students

From around mid-September to mid-October of each academic year.

February (extraordinary enrolment) mainly for students who have been waiting for visas and grants.

More information at the registration section for new doctoral students

Enrolment period

From around mid-September to mid-October of each academic year.

More information at the general registration section

Procedure for the preparation and defense of the research plan

Doctoral candidates must submit a research plan, which will be included in their doctoral student activity report, before the end of the first year. The plan may be improved over the course of the doctoral degree. It must be endorsed by the tutor and the supervisor, and it must include the method that is to be followed and the aims of the research.

At least one of these annual assessments will include a public presentation and defence of the research plan and work done before a committee composed of three doctoral degree holders, which will be conducted in the manner determined by each academic committee. The examination committee awards a Pass or Fail mark. A Pass mark is a prerequisite for continuing on the doctoral programme. Doctoral candidates awarded a Fail mark must submit a new research plan for assessment by the academic committee of the doctoral programme within six months.

The committee assesses the research plan every year, in addition to all of the other activities in the doctoral student activity report. Doctoral candidates who are awarded two consecutive Fail marks for the research plan will be obliged to definitely withdraw from the programme.

If they change the subject of their thesis, they must submit a new research plan.

Formation activities

Activity: Tutorial (compulsory).
Hours: 375.

Activity: Seminars (optional).
Hours: 2.

Activity: Research visits to foreign universities and mobility (optional).
Hours: 480.

Activity: Training in information skills (optional).
Hours: 1.5.

Activity: Research methodology (compulsory).
Hours: 12.

Activity: Innovation and creativity (optional).
Hours: 8.

Activity: Language and communication skills (compulsory).
Hours: 18.

Activity: Assessment based on doctoral student activity report (DAD) and research plan.
Hours: 4.

Procedure for assignment of tutor and thesis director

The academic committee of the doctoral programme assigns a thesis supervisor to each doctoral candidate when they are admitted or enrol for the first time, taking account of the thesis supervision commitment referred to in the admission decision.

The thesis supervisor will ensure that training activities carried out by the doctoral candidate are coherent and suitable, and that the topic of the candidate’s doctoral thesis will have an impact and make a novel contribution to knowledge in the relevant field. The thesis supervisor will also guide the doctoral candidate in planning the thesis and, if necessary, tailoring it to any other projects or activities undertaken. The thesis supervisor will generally be a UPC professor or researcher who holds a doctoral degree and has documented research experience. This includes PhD-holding staff at associated schools (as determined by the Governing Council) and UPC-affiliated research institutes (in accordance with corresponding collaboration and affiliation agreements). When thesis supervisors are UPC staff members, they also act as the doctoral candidate’s tutor.

PhD holders who do not meet these criteria (as a result of their contractual relationship or the nature of the institution to which they are attached) must be approved by the UPC Doctoral School's Standing Committee in order to participate in a doctoral programme as researchers with documented research experience.

The academic committee of the doctoral programme may approve the appointment of a PhD-holding expert who is not a UPC staff member as a candidate’s thesis supervisor. In such cases, the prior authorisation of the UPC Doctoral School's Standing Committee is required. A UPC staff member who holds a doctoral degree and has documented research experience must also be proposed to act as a co-supervisor, or as the doctoral candidate’s tutor if one has not been assigned.

A thesis supervisor may step down from this role if there are justified reasons (recognised as valid by the committee) for doing so. If this occurs, the academic committee of the doctoral programme will assign the doctoral candidate a new thesis supervisor.

Provided there are justified reasons for doing so, and after hearing any relevant input from the doctoral candidate, the academic committee of the doctoral programme may assign a new thesis supervisor at any time during the period of doctoral study.

If there are academic reasons for doing so (an interdisciplinary topic, joint or international programmes, etc.) and the academic committee of the programme gives its approval, an additional thesis supervisor may be assigned. Supervisors and co-supervisors have the same responsibilities and academic recognition.

The maximum number of supervisors of a doctoral thesis is two: a supervisor and a co-supervisor.

For theses carried out under a cotutelle agreement or as part of an Industrial Doctorate, if necessary and if the agreement foresees it this maximum number of supervisors may not apply. This notwithstanding, the maximum number of supervisors belonging to the UPC is two.

More information at the PhD theses section

Permanence

The academic committee of the programme may authorise an extension of up to one year for full-time doctoral candidates who have not applied to deposit their thesis by the end of the three-year period of study, in the terms outlined in the Academic Regulations for Doctoral Studies of the Universitat Politècnica de Catalunya. In the case of part-time candidates, an extension of two years may be authorised. In both cases, in exceptional circumstances a further one-year extension may be granted by the Doctoral School's Standing Committee, upon the submission of a reasoned application by the academic committee of the doctoral programme.

A doctoral candidate may be dismissed from a doctoral programme for the following reasons:

• The doctoral candidate submitting a justified application to withdraw from the programme.
• The maximum period of study and of extensions thereof ending.
• The doctoral candidate not having enrolled every academic year (unless he or she has been authorised to temporarily withdraw).
• The doctoral candidate failing two consecutive assessments.
• The doctoral candidate having disciplinary proceedings filed against him or her that rule that he or she must be dismissed from the UPC.

Dismissal from the programme implies that doctoral candidates cannot continue studying at the UPC and the closing of their academic record. This notwithstanding, they may apply to the academic committee of the programme for readmission and the committee must reevaluate them in accordance with the criteria established in the regulations.

International Mention

The doctoral degree certificate may include International Doctorate mention. In this case, the doctoral candidate must meet the following requirements:

a) During the period of study leading to the award of the doctoral degree, the doctoral candidate must have spent at least three months at a respected higher education institution or research centre outside Spain to complete courses or do research work. The stays and activities carried out must be endorsed by the thesis supervisor and authorised by the academic committee of the programme. The candidate must provide a certifying document issued by the person responsible for the research group of the body or bodies where the stay or activity was completed. This information will be added to the doctoral student’s activity report.
b) Part of the thesis (at least the summary and conclusions) must be written and presented in one of the languages commonly used for science communication in the relevant field of knowledge, which must not be an official language of Spain. This rule does not apply to stays and reports in Spanish or to experts from Spanish-speaking countries.
c) At least two PhD-holding experts belonging to a higher education institution or research centre outside Spain must have issued officially certified reports on the thesis.
d) The thesis examination committee must have included at least one PhD-holding expert from a higher education or research institution outside Spain who was not responsible for the candidate’s stay abroad (point a) above).
e) The thesis defence must have taken place on UPC premises or, in the case of joint programmes, at the location specified in the collaboration agreement.

List of authorized thesis for defense

• SADROLODABAEE, PAYAM: Sustainability, Durability and Mechanical Characterization of a New Recycled Textile-Reinforced Strain-Hardening Cementitious Composite for Building Applications.
  
  Author: SADROLODABAEE, PAYAM
  Thesis file: (contact the Doctoral School to confirm you have a valid doctoral degree and to get the link to the thesis)
  Programme: DOCTORAL DEGREE IN CONSTRUCTION ENGINEERING
  Department: (DECA)
  Mode: Article-based thesis
  Deposit date: 27/05/2022
  Reading date: 11/07/2022
  Reading time: 12:00
  Reading place: Sala O.C. Zienkiewicz, Edifici C1, Planta 2a.C - Centre Internacional de Mètodes Numèrics a l'Enginyeria (CIMNE) - Gran Capità s/n, 08034 Barcelona
  Thesis director: DE LA FUENTE ANTEQUERA, ALBERTO | CLARAMUNT BLANES, JOSEP
  Committee:
       PRESIDENT: PLIZZARI, GIOVANNI
       SECRETARI: PUJADAS ÁLVAREZ, PABLO
       VOCAL: FARINA, ILENIA
  Thesis abstract: Cementitious materials have one of the highest compressive strength-to-weight ratios compared to other construction materials. Nonetheless, both tensile strength capacity and toughness result to be an order of magnitude less respect to the former, which thereby leads to cracking under tensile stresses caused by service loads. This lack of tensile strength capacity of the material leads to cracking and fragile failure in case the material is insufficiently reinforced. Within this context, fibers can be used in cementitious matrices aiming at enhancing the toughness, energy absorption capacity, post-cracking behavior as well as flexural and tensile strength.Although during the past decades, various types of fibers such as asbestos, steel, glass, and polymeric have been tested in brittle matrices, there have been some disadvantages such as detrimental health effects, high cost, and specifically, substantial environmental footprint. Likewise, based on the statistics, the construction sector is responsible for about 40% of the European Union's total final energy consumption, 35% of its total CO2 emissions, and 45% of waste generation. That is why significant efforts should be devoted to applying the `3Rs¿ concept of reducing, reusing, and recycling in the building sector and material fabrication.On the other hand, the textile leftover is one of the predominant waste resources worldwide while only less than 20% is being recycled. The textile industry produces textile wastes (TW) from the primary stages of garment production (pre-consumer waste such as fiber, yarn, and fabric) to the end of its useful life (post-consumer waste: discarded clothes). Thus, the reuse of this textile waste in construction is becoming interesting and convenient due to the shortage of natural mineral resources and increasing waste disposal costs.Recently, sustainable fibers produced from renewable, biodegradable, waste, recycled, available, and low-cost resources becoming a focal point. In this sense, vegetable and cellulosic fibers have already been used as reinforcement in cementitious materials for low- to medium-performance structural applications. TW fiber could be another sustainable alternative for reinforcement in cementitious composites.In view of the abovementioned, this research comprehensively verifies, by means of physical, mechanical, and durability-based material characterization tests, the possibility of incorporation of short TW fiber as well as the nonwoven TW fabric in the cementitious composites as internal reinforcement to produce a sustainable, ductile, and durable composite to be used in building applications. In this regard, several experimental tests were carried out on different mix design samples to characterize the mechanical, microstructural, durability, thermal, acoustic, fire, and shrinkage properties.The results have shown that the recycled TW fiber, especially in the form of nonwoven fabric, could be a technically feasible, sustainable, and durable reinforcement to be used in the cementitious mortar for low to medium-performance structural applications (e.g., façade panels, roofing, raised floors, and masonry structures). Further, the sustainability of the optimum composite as a façade cladding panel (as an example of one projected application) was assessed through the MIVES, a new comprehensive and integrated Multi-Criteria Decision-Making method that embraces the three pillars of sustainability: economic, environmental, and social.Future works on this kind of fiber-reinforced cementitious mortar could be to develop a numerical model simulation or produce a 3D concrete printing (3DCP) prototype by employing additive manufacturing technology.
  

Last update: 02/07/2022 04:45:34.

List of lodged theses

Last update: 02/07/2022 04:30:23.

List of defended theses by year

• AIDAROV, STANISLAV: Fibre reinforced concrete column-supported flat slabs: from material and structural characterization to design and economic optimization.
  
  Author: AIDAROV, STANISLAV
  Thesis link: http://hdl.handle.net/10803/674306
  Programme: DOCTORAL DEGREE IN CONSTRUCTION ENGINEERING
  Department: (DECA)
  Mode: Article-based thesis
  Reading date: 06/05/2022
  Thesis director: DE LA FUENTE ANTEQUERA, ALBERTO | TOSIC, NIKOLA
  

  Committee:
       PRESIDENT: FERNÁNDEZ RUIZ, MIGUEL
       SECRETARI: MURCIA DELSO, JUAN
       VOCAL: VIDAL SARMIENTO, ELENA
  Thesis abstract: Fibre reinforced concrete (FRC) has proven to be a suitable material for statically indetermi-nate elements. The FRC column-supported flat slabs with partial or even total substitution of reinforcing steel bars constructed within the scope of this thesis, provided the positive outcomes from both technical and sustainability perspectives, being a supporting evidence for this state-ment. Despite the successful experiences of FRC slab construction, the widespread use of this technology is still hindered because of a number of factors related to the general comprehension of the material¿s properties, design procedure, and accurate assessment of both technological and economic aspects. In this context, further research is required to complement the current scope of knowledge, providing to practitioners and researchers a clear example of structural capacity of FRC column-supported flat slabs. Moreover, straightforward procedures focused on the design and following evaluation of the potential technological and economic benefits due to use of FRC should be de-rived. Therefore, a rather comprehensive doctoral thesis that covers the majority of the above-mentioned topics is proposed herein. The first part of the study focuses on the material characterization and analysis of the flex-ural behaviour of FRC column-supported flat slab. A full-scale FRC slab was constructed and tested under different load magnitudes, assessing the structural response at both ultimate and serviceability limit states. The results derived proved the sufficient flexural strength at ultimate conditions along with the capacity of moment redistribution and the ductility of the system. Fur-thermore, the studied FRC slab evidenced the acceptable performance in terms of cracking and deflections. Subsequently, the straightforward design-oriented method is proposed to estimate the struc-tural response of FRC column-supported flat slabs in terms of flexural strength, cracking con-trol, and instantaneous deformations. The results derived were compared with a nonlinear anal-ysis, highlighting a suitable accuracy and precision of the proposed approach. Finally, an industrial-oriented study was carried out with the main objective of elaborating a simplified method for the preliminary comparison of traditional and FRC solutions for column-supported flat slabs in terms of economic benefits. The results reflected an increment of direct costs for both fibre and hybrid (fibre + reinforcing steel bars, HFRC) solutions; however, these increments can be compensated by the reduction of the construction period and, as a conse-quence, time-dependent costs (i.e. preliminaries, equipment costs, overheads, and finance costs).
  

• COTS COROMINAS, CARLES: Refuerzo de estructuras de hormigón armado y pretensado por conversión a sección mixta mediante hidrodemolición.
  
  Author: COTS COROMINAS, CARLES
  Thesis link: http://hdl.handle.net/10803/674341
  Programme: DOCTORAL DEGREE IN CONSTRUCTION ENGINEERING
  Department: (DECA)
  Mode: Normal
  Reading date: 06/05/2022
  Thesis director: CASAS RIUS, JUAN RAMON
  

  Committee:
       PRESIDENT: OLLER IBARS, EVA MARIA
       SECRETARI: ALONSO COBO, CARLOS
       VOCAL: APARICIO GARCIA, JORGE
  Thesis abstract: This thesis develops a new structural strengthening technique: converting existing reinforced concrete structures to composite sections by inserting connectors after controlled demolition with high-pressure water. The key point of the research, of a technological nature, is the technique of hydro demolition, which is very unusual in strengthening projects. This technique, applied to existing structures (reinforced or prestressed concrete) makes new reinforcement techniques possible, thanks to the opening of voids and the non-affectation of the existing reinforcement. At present, this technique is mostly used for complex demolition or repair work but not for strengthening. It is in these demolished areas where it is easy to re-reinforce with new rebars, or to insert connectors (to convert to composite section), prior to injection with fluid repair mortars. The increasing robotisation of the hydro demolition terminals already allows an autonomous and programmed advancement of various demolition parameters, even underwater. The resulting interfaces are very solid and crack-free and have good production rates. This ensures a high connection strength, as there are no loose bores and the connectors can be inserted in reinforced areas. This results in very strong reinforcements, as high gradients are transmitted. This results in very strong reinforcements, as high shear forces could be transmitted. To take advantage of the rapid progress of hydro demolition, the use of traditional concretes is discarded and the adaptation and use of high performance mortars (hardening in a few hours) is investigated. To improve post-breaking behaviour, locally in the bolt head area, and to reduce cracking, structural polymeric fibres are incorporated into the interface mortar.This work explores a new structural reinforcement technique, and the development is limited to beam-type elements, although the concept is generically extensible to other structural typologies (walls, D-regions, etc.).The work gives continuity to previous research and realisations carried out in the USA and Sweden, where old steel girder bridges are "post-connected" to originally non-collaborative deck slabs. Likewise, this thesis focuses on the steel plating tensioning of existing concrete beams. This new geometric arrangement will require new construction procedures different from those previously investigated. The use of a connector (high-strength bolt) is proposed, although, again, the reinforcement approach admits other types of connectors.The experimental phase evaluates technological and strength aspects. It is divided into three phases, covering the key points of the technology: field and laboratory validation of the techniques involved, validation of the assembly and numerical and analytical modelling of the results. The technique is performed and validated on a series of beams tested in 3-point bending, with two variants of connectors. To define design criteria and recommendations, the results are compared with simplified analytical models. In addition, they are compared with numerical models to visualise the behaviour in the presence of variations in the support zone. The research validates the constructability and structural response of the technique (in ductility and ultimate capacity). Finally, future lines of research are proposed as this is a new technique: validation in fatigue, shear sections, inclusion of sensors and use of other materials (UHPC, FRP, AMF).
  

• NOGALES ARROYO, ALEJANDRO: Non-linear Finite Element Analysis Oriented to Optimisation of Fibre Reinforced Concrete Structures.
  
  Author: NOGALES ARROYO, ALEJANDRO
  Thesis link: http://hdl.handle.net/10803/674223
  Programme: DOCTORAL DEGREE IN CONSTRUCTION ENGINEERING
  Department: (DECA)
  Mode: Article-based thesis
  Reading date: 11/04/2022
  Thesis director: DE LA FUENTE ANTEQUERA, ALBERTO | TOSIC, NIKOLA
  

  Committee:
       PRESIDENT: PLIZZARI, GIOVANNI
       SECRETARI: PUJADAS ÁLVAREZ, PABLO
       VOCAL: IGNJATOVIC, IVAN
  Thesis abstract: The construction industry is one of the industrial sectors with the largest output worldwide and, thus, of great economic interest. In this sector, reinforced concrete plays a significant role since it is one of the most used materials and particularly in the civil construction sector.This situation presents the research on concrete as a necessity. In the last decades, the addi-tion of fibres into concrete, for structural purpose, has been done for either partial or total sub-stitution of conventional reinforcement (steel rebar). This material is called fibre reinforced con-crete (FRC) and its main feature is its residual (post-cracking) strength, which means that tradi-tional linear elastic analyses are not recommended for implementation since they are not able to take full advantage of the material¿s potential. In this sense, international and national codes and guidelines have included models to characterise the behaviour of this material.Technological breakthroughs in computational tools allow the simulation of FRC aided by non-linear finite element models. In this PhD thesis, by means of these models, different structural elements comprised of FRC currently built in the industry are analysed: precast tunnel segments excavated with tunnel boring machines (TBMs), column¿supported elevated flat slabs and simply supported and two-span continuous beams. To this end, by means of constitutive models im-plemented through a finite element software, the models are calibrated and validated comparing the results with the outcomes obtained from experimental tests. Once this is done, the use of computational tools allows performing broad parametrical analysis to assess the performance of FRC structural elements.This thesis aims to deepen the knowledge of the behaviour of FRC and to contribute towards a better understanding of it in terms of research and structural design. The results derived from the conducted parametrical analyses are used for identifying which parameters have more influ-ence on the structural performance of the different FRC members: evaluating the influence of the residual flexural strength classes, on members with fibres as unique reinforcement, and the combination of the latter with rebar reinforcement ratio on members with hybrid reinforcement. As a result, optimised reinforcement configurations of members made of FRC and code modifi-cations are proposed. The proposed method along with the results are meant to support designers and decision makers to optimise FRC structures. Less material consumption will benefit the construction in-dustry productiveness, in terms of time and direct costs savings, whilst leading it towards a more sustainable production and improving the social perception associated with environmental factors.
  

Last update: 02/07/2022 05:01:06.

Research groups

• ATEM-Structural and Materials Technology
• EC-Construction Engineering
• GRIC-Group of Construction Research and Innovation
• MATCAR-Construction Materials and Roads

Teachers

• Aponte Hernandez, Diego Fernando
• Arrayago Luquin, Itsaso
• Bairan Garcia, Jesus Miguel
• Barra Bizinotto, Marilda
• Casals Casanova, Miquel
• Casanova Hormaechea, Ignasi
• Casas Rius, Joan Ramon
• Cervera Ruiz, Miguel
• Chacon Flores, Rolando Antonio
• de la Fuente Antequera, Albert
• Etxeberria Larrañaga, Miren
• Fernandez Carrasco, Lucia
• Forcada Matheu, Nuria
• Gangolells Solanellas, Marta
• Lopez Almansa, Francisco
• Mari Bernat, Antonio
• Mirambell Arrizabalaga, Enrique
• Molins Borrell, Climent
• Murcia Delso, Juan
• Oller Ibars, Eva
• Pelà, Luca
• Pons Valladares, Oriol
• Ramos Schneider, Gonzalo
• Real Saladrigas, Esther
• Roca Fabregat, Pedro
• Roca Ramon, Xavier
• Segura Perez, Ignacio
• Turmo Coderque, Jose
• Valls del Barrio, Susanna
• Villalba Herrero, Sergi