Pere Roca

Pere Roca
Universitat Politècnica de Catalunya | UPC · Department of Construction Engineering (EC)

Ph. D., Professor

About

186
Publications
95,945
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3,892
Citations
Citations since 2016
76 Research Items
2810 Citations
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500

Publications

Publications (186)
Article
In the literature, rigid no-tension models were generally observed to not perfectly predict the response of dry-joint masonry arches to large support displacements and, in particular, to overestimate the ultimate displacement capacity obtained in experimental tests. This work investigated the reasons for these discrepancies by analysing the case of...
Conference Paper
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This paper presents an experimental study focused on the mechanical performance of retrofitted brick masonry walls under in-plane cyclic shear test. The specimens were tested in two configurations: unreinforced and retrofitted with Basalt Textile Reinforced Mortar (BTRM). The experimental programme aimed to study the suitability and efficiency of t...
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This paper presents the historical development of the vertical extensions of unreinforced masonry buildings in the Eixample district of Barcelona and their impact on the seismic behaviour. Existing masonry buildings of Eixample present significant seismic risk because, despite the low to moderate seismic hazard of Barcelona, they show a marked vuln...
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The type of floor system has a decisive role in the seismic performance of unreinforced masonry buildings. The in-plane stiffness of the floors has to be adequately represented in the numerical modelling of existing buildings, as it can influence their seismic capacity. This paper investigates the seismic behaviour of one-way arch floor systems com...
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A study is presented on the use of a non-standard 40 × 40 × 40 mm 3 specimen for the experimental measurement of the compressive strength of solid fired clay bricks extracted from existing masonry buildings. The viability of such specimen has been assessed by comparison with experimental results obtained with the standard 100 × 100 × 40 mm 3 specim...
Article
The present paper discusses similitude laws employed for the shaking-table tests of masonry structures with flexible diaphragms. Two tasks are tackled. First, the paper presents a literature review on similitude laws. The discussion focuses on Cauchy and Cauchy-Froude laws. Second, numerical analysis is performed to examine the accuracy and adequac...
Article
Support displacements are a major cause of damage to masonry arches. In the last decades, the effect of large support displacements on the stability of masonry arches has been widely investigated. However, there is still a lack of studies dealing with inclined support displacements. In this work, a large experimental campaign was performed on a 1:1...
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Recent research on the mechanical characterisation of Steel Reinforced Grout (SRG) has highlighted its excellent performance as strengthening solutions for masonry structures. Using SRG with limited fabric density ensures a good textile-matrix interlocking, preventing at the same time the failure due to slippage or debonding from the substrate. Thi...
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This article compares the results obtained from the analyses of seven two-story masonry walls with an asymmetric arrangement of the openings. The walls are modelled with finite elements detailed micromodels and equivalent frame models. The equivalent frame model reliability is evaluated by comparing the results obtained with the two modelling strat...
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Compressive tests on clay tiles used in historical masonry timbrel vaults are hindered by the relatively small thickness of the specimens, resulting in buckling or confinement problems depending on the loading direction. This paper presents an experimental campaign and a numerical validation of a novel testing setup for estimating the compressive s...
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This paper reports an experimental programme on masonry walls composed of handmade solid clay brick and hydraulic lime mortar. Reversed cyclic shear compression tests were carried out on the walls in three different configurations: unreinforced, repaired and retrofitted, and just retrofitted. Damaged walls were repaired and retrofitted with Basalt...
Conference Paper
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As one of the main historical construction materials, masonry is abundant among the architectural heritage of earthquake-prone areas of the Mediterranean countries. Earthquake mitigation approaches are now focusing on strengthening solutions based on compatible and environmentally friendly repair materials. These solutions should efficiently improv...
Conference Paper
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Built vernacular heritage embraces buildings that are not designed by specialists, but are part of a process that involves many people over many generations and relies on empirical knowledge. Its value as a key-element for cultural identity is unquestionable. However, precisely due to its empirical and traditional nature, it is often seen as an obs...
Article
Tile vaults are unreinforced masonry structures made of thin bricks (tiles) and fast-setting mortar that can be constructed without the need of a formwork, except at the boundaries, making them inherently economic. Their slenderness and finishing make them also efficient and expressive. These qualities of tile vaulting can be enhanced by combining...
Conference Paper
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This paper presents a contribution for the damage assessment of historic masonry churches exposed to slow-moving landslides. In particular, the authors identified four global damage mechanisms, which are presented here by means of the critical damage assessment of four case studies located in the Liguria region (Italy) in areas affected by slow-mov...
Conference Paper
This paper aims to investigate the effects of geometrical imperfections on the response of a scaled dry-joint arch to the vertical displacement of one support. The arch behaviour was analysed in the large displacement regime using both physical and numerical modelling. The experimental tests were performed on 1:10 small-scale models made of bi-comp...
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The prediction of the structural capacity of masonry buildings against lateral loads requires an accurate characterization of the masonry strength and general response under shear stresses. The experimental determination of shear strength parameters typically relies on shear tests on wallettes, or on standard triplets. Aiming to avoid the behaviour...
Article
The Extended Limit Analysis of Reinforced Masonry (ELARM) is a simple and user-friendly method for the design and structural analysis of singly-curved, reinforced tile vaults [1]. It is based on limit analysis but takes into account the reinforcement’s contribution to the composite cross-section’s bending capacity. A three-dimensional approach to E...
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The masonry tensile strength and shear modulus play a key role in the definition of the shear capacity of masonry structures. These properties are often determined experimentally by means of the diagonal compression test on square walls, which is regulated by the ASTM E519 standard. In spite of its wide use, the interpretation of the test is still...
Article
In this paper, the structural response of a segmental dry-joint masonry arch subjected to increasing support displacements was investigated. The arch behaviour was analysed in the framework of large displacements using finite element (FE) and rigid block (RB) models, both based on a micro-modelling strategy. Once the two modelling approaches were v...
Conference Paper
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This paper presents an experimental campaign carried out in an historical industrial building of Barcelona from the 19 th century, considering in-situ and laboratory minor destructive testing (MDT) techniques. The results obtained showed a good relationship between the in-situ MDT techniques and the tests carried out in the laboratory. The experime...
Conference Paper
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This paper focuses on the application of composite materials to improve the in-plane shear strength of existing brick masonry walls. The experimental program involved the construction of walls composed of handmade solid clay brick and hydraulic lime mortar joints, a recurrent typology for historical buildings in the Mediterranean countries. The wal...
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This paper presents the systematic use of numerical analysis as a tool for addressing some of the most common challenges encountered in the structural analysis of complex historical masonry structures, i.e. the description of the effects of history-related phenomena and the uncertainty of material properties. The numerical strategy is based on the...
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Masonry heritage structures are often affected by slow irreversible deterioration mechanisms that can jeopardise structural stability in the foreseeable future. Static structural health monitoring (SHM), aimed at the continuous measurement of key slow‐varying parameters, has the potential to identify such mechanisms at a very early stage. This can...
Conference Paper
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Static structural health monitoring (SHM), aimed at the continuous measurement of slow-varying parameters over a long period, has been proved to be a powerful tool to support the diagnosis of masonry heritage structures. In such applications, the initial interpretation task involves the identification of evolutionary conditions from recorded data....
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This paper presents an experimental study of the structural behaviour of masonry walls retrofitted with Textile Reinforced Mortar (TRM) to improve their in-plane shear strength and deformation capacity. The experimental programme consists in diagonal compression testing of ten specimens of clay brick and lime mortar masonry retrofitted with three d...
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This paper presents an experimental programme aimed at investigating the use of limestone filler additions to modify the mechanical properties of commercial premixed hydraulic lime based mortars. The influence of adding recycled limestone filler was evaluated from the mechanical point of view, i.e. by comparing the experimental compressive and flex...
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This research presents an experimental and numerical study focusing on the compression test of cylindrical samples core drilled from existing masonry walls. This method is suitable for the minor destructive assessment of the mechanical properties of historical masonry, like that composed of aerial lime mortar joints and solid clay bricks. This part...
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This paper presents the results of an experimental programme about the evaluation of the size effect on the compressive behaviour of cylindrical samples of existing masonry. The study focuses on the in-situ coring and experimental testing of core specimens with 150 mm and 90 mm diameter. The 150 mm cylinder, recurrent in minor destructive evaluatio...
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This work presents a probabilistic method to assess the seismic vulnerability of historical masonry structures, such as churches or cathedrals, including uncertainty analysis of the material parameters. The proposed approach considers the pushover analysis using the finite element method for the structural evaluation of the seismic behaviour of mas...
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The paper discusses the seismic assessment of Mallorca cathedral in Spain. This cathedral is an audacious Gothic structure built on the island of Mallorca during 14th-16th centuries, characterized by its large dimensions and slender structural members. For that purpose, different analysis methods were used. A 3D Finite Element (FE) model of the cat...
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This research presents an experimental programme on the mechanical characterization of masonry under monotonic and cyclic uniaxial compression. Two different types of standard specimens, running bond walls and stack bond prisms, were built using handmade clay bricks and hydraulic lime mortar. The experimental results are compared and discussed in t...
Conference Paper
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Existing heritage structures are frequently composed of diverse masonry typologies, corresponding either to various structural members (e.g. arches, walls, piers) or to additions constructed in different eras. The identification of the material properties of the different masonry typologies is usually demanding due to the high cost of the necessary...
Conference Paper
The mechanical characterization of masonry is of paramount importance for the structural assessment of historical constructions against both vertical and horizontal actions. In particular, the compressive strength of masonry is normally regarded as a critical parameter for structural analysis. However, an accurate determination of the mechanical pr...
Conference Paper
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Macro-models are a common choice for the numerical analysis of large-scale masonry structures. Despite their efficiency in terms of pre-processing and computational cost, these strategies often result in a poor representation of cracking, not properly localized and biased by the finite element mesh orientation. This work presents a remedy to the pr...
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This paper presents a management tool for the large-scale assessment and mitigation of the seismic risk of urban systems. The research introduces a new perspective for a scientifically tackled holistic approach. The proposed methodology considers multiple objectives, from the identification of the most vulnerable buildings whose collapse may hinder...
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The accuracy of the Equivalent Frame Method (EFM) in modelling the seismic non-linear behaviour of unreinforced masonry (URM) buildings is investigated for regular walls (i.e. walls with regular openings' distribution) with different pier-to-spandrel geometrical relations. The developed EFM is composed of pier and spandrel elements with spread plas...
Conference Paper
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For preserving existing structures to the extent possible, vibration-based damage detection techniques are gaining more attention. In specific, tracking the changes in a structure's natural frequencies employing the Principal Component Analysis (PCA) seems to be a promising technique. This paper presents an ongoing research for developing an approa...
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Mallorca cathedral is one of the largest ever built cathedrals in the world. When compared with all other Gothic cathedrals in the world, it is found that its columns have the highest slenderness ratio, its main nave span is the second longest after Girona cathedral, and its main nave is the third highest after those of Beauvais and Milan cathedral...
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An integrated investigation of engineering archaeometry was carried out using dynamic identification, dynamic monitoring and Infra-Red (IR) thermography for the study of the dynamic behavior of Mallorca cathedral in Spain. The cathedral is a large historical masonry structure built during 14-16th c. Dynamic identification and monitoring allowed the...
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This paper represents a continuation of a review on the seismic safety assessment of historical structures using some selected integrated investigation activities. In the first part of this review the dynamic investigation was presented. Here a focus is made on the updating of the numerical models used in the assessment phase and the used technique...
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Assessment of seismic safety of historical structures is a challenging task because the information available about the assessed structure is usually limited. Therefore, it is often necessary to exploit a number of integrated investigation activities to increase the level of knowledge about the historical structure under consideration. Thus, in the...
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Finite element macro-modelling approaches are widely used for the analysis of large-scale masonry structures. Despite their efficiency, they still face two important challenges: the realistic representation of damage and a reasonable independency of the numerical results to the used discretization. In this work, the classical smeared crack approach...
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The Equivalent-Frame Method (EFM), a simplified procedure for structural modelling of masonry constructions, is having a great success for the good balance that it allows between the accuracy of the geometrical description and the simplicity of the mechanical calibration. Despite the widespread use of EFM in scientific and professional field, some...
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Mortar is of all masonry components the most difficult to be experimentally characterised in heritage buildings. This paper investigates the possibility of combining different in-situ and laboratory minor destructive testing (MDT) techniques to assess the strength of mortar in historical brickwork. Lime mortar and clay brick walls were built in the...
Article
The paper presents an integrated approach aimed at assessing the seismic safety of Mallorca cathedral. This cathedral is an extraordinary historical construction dating back to the middle ages. The experimental modal parameters of the cathedral were identified using Ambient Vibration Testing (AVT). The cathedral numerical model was updated using th...
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This paper presents the study of the structural performance of a set of timbrel vaults belonging to the so-called Administration Pavilion of the Hospital de Sant Pau, a large-scale hospital complex located in Barcelona. The paper includes three parts. First, the Administration pavilion of Hospital de Sant Pau is described by putting the emphasis on...