Multiscale analysis of out-of-plane masonry elements using different structural models at macro and microscale

Addessi, Daniela; Re, Paolo Di; Gatta, Cristina; Sacco, Elio

doi:10.1016/j.compstruc.2020.106477

Cited by 22 publications

(9 citation statements)

References 32 publications

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“…Usually, in Pakistan, the design and assessment practices of IRC frames only consider the estimated dead load of infill walls [8] while ignoring all other important parameters, including relative strength and stiffness between the RC frame and infill walls, types of bricks, and types of mortar, which are known to alter the seismic performance of IRC frame structures [1,24,25]. For this reason, infill walls made of fire burnt clay bricks are common across the northern part, including Punjab, Khyber Pakhtunkhwa, Pakistan-administrated Kashmir, Baluchistan, the capital territory Islamabad, and other seismic-prone regions of the country [26].…”

Section: Introductionmentioning

confidence: 99%

Effects of Infills in the Seismic Performance of an RC Factory Building in Pakistan

et al. 2021

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Infilled reinforced concrete (IRC) frames are a very common construction typology, not only in developing countries such as Pakistan but also in southern Europe and Western countries, due to their ease of construction and less technical skills required for the construction. Their performance during past earthquakes has been in some cases satisfactory and in other cases inadequate. Significant effort has been made among researchers to improve such performance, but few have highlighted the influence of construction materials used in the infill walls. In some building codes, infills are still considered as non-structural elements, both in the design of new buildings and, sometimes, in the assessment of existing buildings. This is mainly due to some difficulties in modeling their mechanical behavior and also the large variety of typologies, which are difficult to categorize. Some building codes, for example, Eurocode, already address the influence of infill walls in design, but there is still a lack of homogeneity among different codes. For example, the Pakistan building code (PBC) does not address infills, despite being a common construction technique in the country. Past earthquake survey records show that construction materials and infill types significantly affect the seismic response of buildings, thus highlighting the importance of investigating such parameters. This is the object of this work, where a numerical model for infill walls is introduced, which aims at predicting their failure mode, as a function of some essential parameters, such as the friction coefficient between mortar and brick surface and mortar strength, usually disregarded in previous models. A comprehensive case study is presented of a three-story IRC frame located in the city of Mirpur, Pakistan, hit by an earthquake of magnitude 5.9 on 24 September 2019. The results obtained from the numerical model show good agreement with the damage patterns observed in situ, thus highlighting the importance of correctly modeling the infill walls when seismically designing or assessing Pakistani buildings that make use of this technology.

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Section: Introductionmentioning

confidence: 99%

Effects of Infills in the Seismic Performance of an RC Factory Building in Pakistan

et al. 2021

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“…Usually, damage-based [9,17,18] and plasticity-based [19] formulations are used. Multiscale procedures were also proposed representing a modern and attractive approach to face the mechanical modeling of microstructured materials [20][21][22], allowing to obtain a costeffective tool when parallel computing sources are employed. Lastly, discrete models were successfully developed and used to evaluate masonry bridge structural response [23,24].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Dynamic Analysis of a Masonry Arch Bridge Accounting for Damage Evolution

et al. 2021

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This study investigates the nonlinear dynamic response of the masonry bridge ‘Ponte delle Torri’ in Spoleto, aiming at assessing the seismic performance of the structure and evaluating the occurring damaging mechanisms. A 3D Finite Element (FE) macromechanical procedure implemented in the FE program FEAP is adopted to model the bridge. To reproduce the typical nonlinear microcracking process evolving in masonry material when subjected to external loads, an isotropic damage model is used. This is based on a scalar damage variable introduced in the stress-strain constitutive law and equally degrading all the components of the elastic constitutive operator. A nonlocal integral definition of the damage associated variable, that is the equivalent strain measure governing its evolution, is adopted to overcome the mesh dependency problems of the FE solution typically occurring in the presence of strain softening behavior. Based on the results of a recent study by some of the authors, a single equivalent pier is analyzed, whose geometry and boundary conditions are selected so that its response can provide useful information on the out-of-plane dynamic behavior of the overall bridge. To perform the seismic assessment, a set of recorded accelerograms is properly selected to simulate the seismic history of the Spoleto site. The nonlinear dynamic response of the structure is evaluated and monitored in terms of top displacement time history, evolution of the global damage index, and distribution of the damage variable. First, a set of analyses is performed by imposing the selected ground motions one by one on the initial undamaged configuration for the structure with the aim of emphasizing the damaging effects on its dynamic response. Then, the accelerograms are arranged in sequence to reproduce the seismic history of the site and analyze the influence of accumulated damage on the dynamic amplification of the response. A critical comparison of the bridge response to the sequence of accelerograms and the single records is made, and the interaction between the damaged structure dynamic response and the signal characteristic is highlighted, as well.

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“…The damagefriction law originally proposed in [16] is employed for joints. This allows to capture the typical failure modes of arches due to fracture mode I and II, and has been recently extended to mortar joints modeled as 2D [17] or 3D [18] interfaces. Moreover, when dealing with strengthened arch systems, reinforcements are modeled with truss elements, whose constitutive response is properly identified to also reproduce the debonding and delamination phenomena in a simplified and conventional way [8,10,19].…”

Section: Introductionmentioning

confidence: 99%

Micromechanical Analysis of Unreinforced and Reinforced Masonry Arches

Addessi¹,

Gatta²,

Nocera³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Multiscale analysis of out-of-plane masonry elements using different structural models at macro and microscale

Cited by 22 publications

References 32 publications

Effects of Infills in the Seismic Performance of an RC Factory Building in Pakistan

Effects of Infills in the Seismic Performance of an RC Factory Building in Pakistan

Nonlinear Dynamic Analysis of a Masonry Arch Bridge Accounting for Damage Evolution

Micromechanical Analysis of Unreinforced and Reinforced Masonry Arches

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