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

Abstract

The behavior of masonry shear walls reinforced with pseudoelastic Ni–Ti shape memory alloy (SMA) strips and engineered cementitious composite (ECC) sheets is the main focus of this paper. The walls were subjected to quasi-static cyclic in-plane loads and evaluated by using Abaqus. Eight cases of strengthening of masonry walls were investigated. Three masonry walls were strengthened with different thicknesses of ECC sheets using epoxy as adhesion, three walls were reinforced with different thicknesses of Ni–Ti strips in a cross form bonded to both the surfaces of the wall, and one was utilized as a reference wall without any reinforcing element. The final concept was a hybrid of strengthening methods in which the Ni–Ti strips were embedded in ECC sheets. The effect of mesh density on analytical outcomes is also discussed. A parameterized analysis was conducted to examine the influence of various variables such as the thickness of the Ni–Ti strips and that of ECC sheets. The results show that using the ECC sheet in combination with pseudoelastic Ni–Ti SMA strips enhances the energy absorption capacity and stiffness of masonry walls, demonstrating its efficacy as a reinforcing method.

The Utilization of Shape Memory Alloy as a Reinforcing Material in Building Structures: A Review

“…The results showed that this method improved the bearing capacity and ductility of the wall and delayed strength degradation. In order to solve the problem of brittle cracking of ordinary concrete, Tabrizikahou et al [140] combined Ni-Ti SMA strips and ECC to form an SMA-ECC shear wall and used Abaqus software (https://www.3ds.com/products/simulia/abaqus) for evaluation, as shown in Figure 14d. The results revealed that the combination of the two methods improved the shear wall's energy dissipation capacity and led to a superior self-resetting ability and self-healing ability, thereby improving the seismic performance and durability of the shear wall structure.…”

Shape Memory Alloy‐Based Seismic Retrofit of an existing URM Building

“…Experimental and numerical studies proved stable rocking behavior without significant residual rotations. More recently, numerical investigations regarded the employment of pseudoelastic Ni-Ti SMA strips and engineered cementitious composite (ECC) sheets in masonry reinforcement demonstrating the enhancement of the energy absorption capacity and the stiffness of masonry walls [11].…”

Out-of-Plane Behavior of Masonry Prisms Retrofitted with Shape Memory Alloy Stripes: Numerical and Parametric Analysis

“…The impact of applying different contact characteristics (tie, adhesive, surface-to-surface) is explored in another publication by the authors [ 24 ]; the contact properties between SMA stripes and masonry prism were established in the present study based on those results. An adhesive contact with tie interaction was employed to embed the SMA strips on the exterior surface of the masonry prisms.…”

“…Tabrizikahou et al [ 24 ] numerically analyzed the application of a novel hybrid retrofitting method using SMA stripes embedded in engineered cementitious composite (ECC) installed on masonry brick walls. A parametric analysis was carried out to investigate the effect of different retrofitting factors on the cyclic behavior of the masonry walls.…”