Out-of-plane response of ECC-strengthened masonry walls

Abstract

This paper focuses on the flexural behavior of masonry walls strengthened with precast engineered cementitious composite (ECC) sheet. The walls were subjected to out-of-plane static loading and analyzed using ABAQUS. For the validation of numerical results, four masonry walls of size 762 × 480 × 230 mm were cast using burnt clay bricks and cement mortar. Out of four, two masonry walls were strengthened with precast ECC sheet using epoxy as adhesive, and the remaining two acted as control specimens. The validation of numerical results with the experimental results shows that the model can effectively capture the nonlinear behavior of masonry and ECC to predict the strength and failure mechanism. The influence of mesh size on the numerical results is also reported. Further, a parametric study has been carried out to observe the effect of several parameters such as percentage of ECC reinforcement ratio, span/depth (L/d) ratio and width/thickness (b/h) ratio of the strengthened masonry walls. This study reveals that the precast ECC sheet increases the load-carrying capacity and ductility of brick masonry walls and hence demonstrates its performance as a strengthening element for brick masonry structures.

Cyclic Behavior of Masonry Shear Walls Retrofitted with Engineered Cementitious Composite and Pseudoelastic Shape Memory Alloy

“…First, it is essential to note that the numerical parameters utilized in this analysis were previously validated in the Munjal and Singh research work [33]. The behavior of URM is comparable to the empirical performance, with the highest divergence of 0.21% in displacements and 1.48% in maximum stresses.…”

“…The amplitude of lateral cyclic displacements is increased gradually on the sample, and each phase is repeated three times (Figure 1b). The authors used the material properties of the bricks in the Concrete Damage Plasticity (CDP) model experimentally tested and provided by Munjal and Singh [33]. Commercial finite element software Abaqus was used in this study to examine the effect of retrofitting with SMA strips or/and ECC sheets on the cyclic behavior of URMs.…”

“…The modulus of elasticity of masonry and ECC used for analytical modeling are 1450 and 17,500 MPa, respectively, based on experimental results provided by Munjal and Singh [33]. The material parameters required for the CDP model were specified to characterize the plasticity values of the masonry prism in Abaqus, as indicated in Table 4.…”

“…Munjal and Singh [33] investigated the out-of-plane flexural behavior of URM walls reinforced with ECC sheets. The load-carrying capability of torsional reinforced masonry walls with prefabricated ECC sheet was found to be 440% more than that of control/unstrengthened masonry walls.…”

Effect of ECC layer thickness and reinforcement ratio on the load carrying capacity of steel‐reinforced composite beams

“…40 The other parameter K c is defined as the ratio of the second stress invariant of the tensile meridian to the compressive meridian, which is adopted as 2/3 to ensure an elliptical shape for the failure surface. 41,42…”