Multi‐directional response of unreinforced masonry walls: experimental and computational investigations

Dolatshahi, Kiarash M.; Aref, Amjad J.

doi:10.1002/eqe.2714

Cited by 16 publications

(5 citation statements)

References 39 publications

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“…The numerical simulations conducted by the authors underlined the accuracy and robustness of the proposed modeling approach. A similar approach was also used in Dolatshahi and Aref [21] for studying the response of masonry walls subjected to different sets of multi-directional loading combinations considering both monotonic and cyclic quasi-static loading protocols. The above studies show the advantages and the potentialities in using modeling approaches based on interface elements for modeling the interaction among different components of structural systems.…”

Section: Introductionmentioning

confidence: 99%

Coupled interface-based modelling approach for the numerical analysis of curved masonry specimens strengthened by CFRP

Grande

Fagone

Rotunno

et al. 2018

Composite Structures

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Aim of the present paper is to numerically study the bond behavior of curved masonry specimens externally strengthened by Carbon Fiber Reinforced Polymer systems (CFRP). A simple 1D-modeling approach is presented to this aim, where the coupled behavior between shear and normal stresses developing at the reinforcement/masonry interface level is specifically introduced to properly account for the role played by the curvature radius. The model is indeed enriched by the introduction of shear stress-slip laws able to account for the beneficial friction effect, when compression normal stresses develop at the interface level and the reduction of the slip strength corresponding to the de-cohesion in presence of normal stresses in tension. Considering some case studies derived from the current literature, consisting of shear-lap bond tests of curved masonry specimens characterized by different curvatures of the bonded surface and different strengthening configurations, the validation of the proposed approach is carried out. In particular, two modeling strategies are considered and critically compared: the first one, denoted as approach (A), where the presence of the mortar joints is neglected, and the second one, denoted as approach (B), where mortar joints are specifically introduced in the model. Finally, the results obtained by using the proposed simple approach are compared with those obtained from both sophisticated FE numerical models and theoretical formulas deduced form the current literature.

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Section: Introductionmentioning

confidence: 99%

Coupled interface-based modelling approach for the numerical analysis of curved masonry specimens strengthened by CFRP

Grande

Fagone

Rotunno

et al. 2018

Composite Structures

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show abstract

“…Other SMM-II approaches available in literature are based on different interface constitutive models based on damage and friction [36][37][38][39], elasto-plasticity [2,3,12], damage-plasticity [35,40], softening fracture [41], and viscoplasticity [42]. More recently, SMM-I [31] and SMM-III approaches [43][44][45][46] have been developed to simulate the cyclic behavior of masonry systems. Bolhassani et al [47] also used an SMM-III approach to investigate the nonlinear behavior of hollow and partially grouted concrete block masonry walls using a damageplasticity traction-separation law for the masonry joint interfaces, and a damage-plasticity continuum constitutive model for expanded masonry units.…”

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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“…However, the traditional structure form is deficient in poor antiseismic performance, high weight, bad tension, and poor ductility. When an earthquake takes place, the structure is often damaged due to the serious displacement outside the complete wall plane [7][8][9][10]. Earthquakes have caused so many tragedies, involving house damage, wall cracks, and resultant living risks, as well as large destructions such as direct collapse, economic losses, and casualties.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Crack Distributions of the Single‐Layer Building under Seismic Waves

2018

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This paper conducts a numerical simulation of the antiseismic performance for single-layer masonry structures, completes a study on crack distributions and detailed characteristics of masonry structures, and finally verifies the correctness of the numerical model by experimental tests. This paper also provides a reinforced proposal to improve the antiseismic performance of single-layer masonry structures. Results prove that the original model suffers more serious damage than the reinforced model; in particular, longitudinal cracks appear on bottoms of two longitudinal walls in the original model, while these cracks appear later in the reinforced model; a lot of cracks appear on the door hole of the original model, and no crack appears in the reinforced model till the end of seismic waves; seismic damage of walls in the reinforced model is obviously lighter than that in the original model; dynamic responses at all observed points of the reinforced masonry are obviously less than those of the original model. Strains at all positions of the reinforced model are obviously smaller than those of the original model. From macroscopic and microscopic perspectives, the computational results prove that the reinforced proposal proposed in this paper can effectively improve the antiseismic performance of the masonry structure.

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Multi‐directional response of unreinforced masonry walls: experimental and computational investigations

Cited by 16 publications

References 39 publications

Coupled interface-based modelling approach for the numerical analysis of curved masonry specimens strengthened by CFRP

Coupled interface-based modelling approach for the numerical analysis of curved masonry specimens strengthened by CFRP

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

Numerical Study on Crack Distributions of the Single‐Layer Building under Seismic Waves

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