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Earthquake resilient RC walls using shape memory alloy bars and replaceable energy dissipating devices

机译：地震弹性RC墙体使用形状记忆合金棒和可更换的能量耗散装置

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摘要

This study presents a novel precast reinforced concrete (RC) wall system using shape memory alloy (SMA) bars and replaceable energy dissipating (ED) devices to achieve earthquake resilience (hereafter referred to as SMA-based RC wall). The major advantages of this structural system include (1) self-centering (SC) capability provided by the unbonded superelastic SMA bars used in the bottom boundary zones of the wall, (2) concentrated energy dissipation and damage in the replaceable steel angles, and (3) an earthquake resilient design that requires minimal repair even after strong earthquakes. The structural details and design considerations of the SMA-based RC wall were first introduced. Subsequently, the mechanical behavior of the SMA bars and ED angles was investigated through cyclic loading tests. The seismic performance of the SMA-based RC walls was computationally investigated using various parameters of interest in seismic applications and evaluated in terms of strength, stiffness, and SC and ED capabilities. The proposed SMA-based RC walls exhibited satisfactory and stable flag-shaped hysteretic loops with excellent SC and satisfactory ED capabilities. Compared with conventional RC walls, the proposed SMA-based RC walls provide a promising solution for high-performance structural systems required by modern resilient and sustainable civil infrastructure.
机译：本研究提出了一种新型预制钢筋混凝土（RC）壁系统，使用形状记忆合金（SMA）杆和可更换的能量耗散（ED）器件，以实现地震弹性（以下称为SMA基RC壁）。该结构系统的主要优点包括（1）由墙壁底部边界区使用的未粘附的超弹性SMA条提供的自定心（SC）能力，（2）浓缩能量耗散和可更换钢角度的损坏， （3）一种地震弹性设计，即使在强大的地震之后也需要最小的修复。首次介绍了SMA的RC墙的结构细节和设计考虑因素。随后，通过循环加载试验研究了SMA条和ED角度的机械特性。基于SMA的RC壁的地震性能使用地震应用中的各种目的参数来计算研究，并在强度，刚度和SC和ED能力方面进行评估。拟议的基于SMA的RC墙壁呈现出令人满意且稳定的旗形滞后环，具有优异的SC和令人满意的ED能力。与传统的RC墙相比，所提出的基于SMA的RC壁为现代弹性和可持续的民用基础设施所需的高性能结构系统提供了有希望的解决方案。

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