Numerical simulation of soft brick unreinforced masonry walls subjected to lateral loads

Vemuri, Jayaprakash; Ehteshamuddin, Syed; Subramaniam, Kolluru V. L.

doi:10.1080/23311916.2018.1551503

Cited by 15 publications

(3 citation statements)

References 28 publications

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“…Bed joint (𝑓 𝑡𝑥 ) and head joint (𝑓 𝑡𝑦 ) are signified as horizontal and vertical spaces in the brick as shown in Figure 1. The bed joint and head joint strength is varied in the range 25x10 4 to 37.5x10 4 N/m 2 and reduced to 25x10 4 to 17x12.5 4 N/m 2 respectively as shown in Figure 7 and Figure 8. Friction-based head joint friction is utilized to examine its effect on the response of the wall.…”

Section: Cracking Parametersmentioning

confidence: 99%

“…However, because of the non-linear and composite character of masonry, URM constructions are extremely susceptible to damage under the enormous lateral stresses generated by powerful earthquakes, and their performances need to be improved. [2][3][4][5]. The correlations between the mechanical properties of masonry at shear and compression differ greatly due to the non-homogeneity and anisotropy of masonry.…”

Section: Introductionmentioning

confidence: 99%

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Finite element analysis of unreinforced masonry walls with different bond patterns

Wani,

Kodali,

Reddy

et al. 2023

Sustainable Engineering and Innovation

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Masonry is the oldest building material, yet it is also the least understood due to the non-linear and composite nature of masonry, which consists of brick units, mortar, and unit-mortar contact. In this paper, the response of a two-dimensional masonry wall with a window opening subjected to an in-plane lateral pushover loading is simulated by varying the interface properties of brick such as crushing, elastic, cracking, and shear properties. The simplified micro-modeling technique with the Engineering Masonry model for bricks and linear stiffness properties for the interfaces in the bed and head joints is employed to investigate the geometric nonlinear behavior of the masonry wall. The pushover curves obtained from the numerical simulations indicate that there is a significant influence on the lateral load response of the wall due to elastic, crushing, and shear parameters while the cracking parameters have less impact on the ductile capacity of the structure. Moreover, the study is also extended to examine the effect of bond patterns such as English, Stretcher, Flemish, and Header bond with varied aspect ratios of 1,1.5 and 0.75. In all four bond patterns, it was observed that the walls with lower aspect ratios exhibited higher strength. Further, in comparison to the other bond patterns, walls with the Flemish bond pattern demonstrated higher strengths at both lower and higher aspect ratios.

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Section: Cracking Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Finite element analysis of unreinforced masonry walls with different bond patterns

Wani,

Kodali,

Reddy

et al. 2023

Sustainable Engineering and Innovation

View full text Add to dashboard Cite

show abstract

“…Lourenço and Rots [6] proposed an SMM-II approach in which the response of the interface elements was described by a three-surface interface constitutive model based on softening plasticity. This constitutive model could simulate shear sliding, tensile cracking, and compressive crushing, and was later extended, based on plasticity theory, to simulate the cyclic response of masonry structures [10] in many different applications [24][25][26][27][28][29][30][31]. Macorini and Izzuddin [4] proposed a three-dimensional twosurface interface constitutive model that used a co-rotational approach to account for geometric nonlinearity.…”

Section: Introductionmentioning

confidence: 99%

Capabilities and limitations of existing finite element simplified micro-modeling techniques for unreinforced masonry

Kumar¹,

Barbato²,

Rengifo-López³

et al. 2022

Res. Eng. Struct. Mater.

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Finite element (FE) simplified micro-modeling techniques are commonly used to investigate and predict the mechanical behavior of masonry structures because they provide a good compromise between accuracy and computational cost. These FE techniques generally discretize masonry structural elements into expanded masonry units and zero-thickness interface joints of assumed known locations. These joints correspond to actual masonry joints and to preferential cracking surfaces, which are often placed vertically in the middle of the expanded masonry units to simulate the cracking mechanisms that are typically observed in masonry bricks and blocks. Three different versions of simplified micromodels (SMMs) are widely used in the literature to model the response of masonry walls and assemblies: SMMs with rigid, elastic, and elasto-plastic constitutive models for the expanded masonry units. All SMMs are based on the hypothesis that the masonry inelastic behavior and cracking are concentrated along the pre-defined zero-thickness interface joints. The hypothesis is often satisfied for ordinary masonry, in which masonry units are generally stronger than the masonry joints, i.e., mortar and unit-mortar interface. However, this hypothesis is not always satisfied for historical masonry with units of irregular shapes or for earth block masonry, in which masonry units and masonry joint can have similar mechanical properties. This paper highlights the capabilities and limitations of SMM techniques by comparing the experimentally-measured and numerically-simulated response of ordinary and earth block masonry walls, for which well-documented experimental results are available in the literature. It is found that SMMs can properly reproduce the mechanical behavior of masonry when the masonry units are significantly stronger than the masonry joints; however, SMMs produce poor estimates of the mechanical response when this hypothesis is not satisfied. This finding highlights the need to develop more general FE models to investigate the mechanical behavior of different masonry materials and construction techniques, as well as to identify the parameters controlling the cracking patterns and the conditions under which SMM techniques can be accurately use.

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Evaluation of Ground Motion Scaling Techniques

Vemuri

Subramaniam

2020

Lecture Notes in Civil Engineering

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Numerical simulation of soft brick unreinforced masonry walls subjected to lateral loads

Cited by 15 publications

References 28 publications

Finite element analysis of unreinforced masonry walls with different bond patterns

Finite element analysis of unreinforced masonry walls with different bond patterns

Capabilities and limitations of existing finite element simplified micro-modeling techniques for unreinforced masonry

Evaluation of Ground Motion Scaling Techniques

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