Abstract
Smart materials have found numerous applications in many areas in civil engineering recently. One class of these materials is shape memory alloy (SMA) which exhibits several unique characteristics such as superelasticity and shape memory effect. Due to these characteristics, research efforts have been extended to use SMA in controlling civil structures. This paper investigates the effectiveness of SMA reinforcements in enhancing the behavior of shear walls, especially when subjected to seismic excitations. Two ordinary and coupled shear walls were introduced as reference structures and were modeled by ABAQUS software. For improving the seismic response of the shear walls, vertical SMA reinforcing bars were proposed to be implemented like conventional steel reinforcements, throughout the height of the structures and in every connecting beam in the coupled shear wall system. The one dimensional superelastic model of SMA material was implemented in the computer software using FORTRAN code. The dynamic response of the shear walls subjected to seismic loading was investigated through time history analyses under El-centro and Koyna records. The results showed that using superelastic SMA material instead of steel bars caused remarkable reduction in residual displacement for both ordinary and coupled shear walls. In addition, SMA reinforcements could significantly decrease the maximum deflection of the coupled shear wall system.
Highlights
Many multi-storey buildings contain shear walls around the elevator shafts and stairwells as lateral resisting systems
Two ordinary and coupled shear walls were introduced as reference structures and were modeled by ABAQUS software
Two ordinary and coupled shear walls were introduced as reference structures and their seismic behavior with and without shape memory alloy (SMA) reinforcement was evaluated through time history analyses
Summary
Many multi-storey buildings contain shear walls around the elevator shafts and stairwells as lateral resisting systems. SMA is one example of smart materials that exhibit several unique characteristics such as shape memory effect, superelasticity, and energy dissipation features. Et al in a series of publications studied the effectiveness of SMA materials for use in seismic applications [1]. They studied the implementation of various states of SMA materials for the use of special dampers in structures They proposed different recentering or dissipating devices based on experimental results. Li et al experimentally studied the behavior of smart concrete beams with embedded shape memory alloy bundles [15] They used SMA bundles as actuators to achieve recovery force. Two ordinary and coupled shear walls were introduced as reference structures and their seismic behavior with and without SMA reinforcement was evaluated through time history analyses
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