Abstract Self-centering buckling-restrained braces (SC-BRBs) consisting of BRBs as the primary load-resisting elements and shape-memory alloy (SMA) bars as the supplemental re-centering elements have shown the higher axial resistance in tension and compression along with negligible residual deformation under cyclic loading. Superplastic characteristics of Nickle and Titanium (NiTi) SMA bars provide the self-centering mechanism, which minimizes the residual drift response of buckling-restrained braced frames (BRBFs) under earthquake loadings. The present study is focused on the seismic performance of low to high-rise BRBFs equipped with SC-BRBs, conventional BRBs, and Hybrid braces (i.e., a combination of BRBs and SC-BRBs) under near-field ground motions. 3-story, 9-story, and 20-story frames with both moment-resisting and non-moment-resisting beam-to-column connections have been considered in this study. Nonlinear dynamic analyses have been carried out on eighteen nos. of numerical models developed using a computer software OpenSees for a set of forty near-field ground motions. Though SC-BRBFs exhibited negligible residual drift response, they showed a higher peak interstory drift ratios as compared to BRBFs. Low-rise BRBFs with pinned beam-to-column connections are found to be more vulnerable to failure under near-fault ground motions. The use of Hybrid frames resulted in the improved seismic performance of 9-story and 20-story building frames.

中文翻译：

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近断层地震动下基于SMA的自定心屈曲约束支撑框架的地震响应

摘要 自定心屈曲约束支撑 (SC-BRBs) 由 BRBs 作为主要抗载荷元件和形状记忆合金 (SMA) 杆作为补充的再定心元件，在拉伸和压缩中显示出更高的轴向阻力。循环载荷下残余变形可忽略不计。镍钛 (NiTi) SMA 钢筋的超塑性特性提供了自定心机制，可最大限度地减少地震载荷下屈曲约束支撑框架 (BRBF) 的残余漂移响应。本研究的重点是在近场地面运动下配备 SC-BRB、传统 BRB 和混合支架（即 BRB 和 SC-BRB 的组合）的低至高层 BRBF 的抗震性能。3层，9层，本研究考虑了具有抗弯和非抗弯梁柱连接的 20 层框架。已经对 18 个进行了非线性动力学分析。使用计算机软件 OpenSees 为一组 40 个近场地面运动开发的数值模型。尽管 SC-BRBF 的残余漂移响应可以忽略不计，但与 BRBF 相比，它们显示出更高的层间漂移比峰值。发现具有固定梁柱连接的低层 BRBF 在近断层地震动下更容易发生故障。混合框架的使用提高了 9 层和 20 层建筑框架的抗震性能。使用计算机软件 OpenSees 为一组 40 个近场地面运动开发的数值模型。尽管 SC-BRBF 的残余漂移响应可以忽略不计，但与 BRBF 相比，它们显示出更高的层间漂移比峰值。发现具有固定梁柱连接的低层 BRBF 在近断层地震动下更容易发生故障。混合框架的使用提高了 9 层和 20 层建筑框架的抗震性能。使用计算机软件 OpenSees 为一组 40 个近场地面运动开发的数值模型。尽管 SC-BRBF 的残余漂移响应可以忽略不计，但与 BRBF 相比，它们显示出更高的层间漂移比峰值。发现具有固定梁柱连接的低层 BRBF 在近断层地震动下更容易发生故障。混合框架的使用提高了 9 层和 20 层建筑框架的抗震性能。