Abstract

Frame and rocking wall (FRW) structures have excellent resilient performance during earthquakes. However, the concrete at interfacial corners of rocking walls (RWs) is easily crushed due to local extreme compression during the rocking process. An innovative RW with a curved interface is proposed to prevent interfacial corners from producing local damage, enhancing its earthquake resilient performance (ERP). The precast wall panel with a curved interface is assembled into an integral self-centering hybrid rocking wall (SCRW) by two post-tensioned unbonded prestressed tendons. Moreover, two ordinary energy dissipation steel rebars and two shear reinforcements are arranged to increase the energy dissipation capacity and lateral resistance. Two SCRW specimens and one monolithic reinforced concrete (RC) shear wall (SW) were tested under pseudo-static loading to compare the ERPs of the proposed SCRW and the SW, focusing on studying the effect of the curved interface on the SCRW. The key resilient performance of rocking effects, failure modes, and hysteretic properties of the SCRW were explored. The results show that nonlinear deformations of the SCRW are concentrated along the interface between the SCRW and the foundation, avoiding damage within the SCRW. The restoring force provided by the prestressed tendons can effectively realize self-centering capacity with small residual deformation, and the resilient performance of the SCRW is better than that of monolithic SW. In addition, the curved interface of the SCRW makes the rocking center change and move inward, partially relieving the stress concentration and crush of concrete. The rocking range of the rocking center is about 41.4% of the width of the SCRW.

中文翻译：

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拟静力加载下弧形界面自定心混合摇墙的回弹性能

摘要

框架和摇墙（FRW）结构在地震期间具有出色的回弹性能。然而，摇动墙（RW）界面角处的混凝土在摇动过程中由于局部极端压缩而很容易被压碎。提出了一种具有弯曲界面的创新RW，以防止界面角产生局部损坏，从而增强其抗震性能（ERP）。具有弯曲界面的预制墙板通过两根后张无粘结预应力筋组装成整体自定心混合摇墙（SCRW）。并设置两根普通消能钢筋和两根抗剪钢筋，增加消能能力和侧向抗力。在伪静力加载下对两个 SCRW 试件和一个整体式钢筋混凝土 (RC) 剪力墙 (SW) 进行了测试，以比较所提出的 SCRW 和 SW 的 ERP，重点研究弯曲界面对 SCRW 的影响。探索了 SCRW 的摇摆效应、失效模式和迟滞特性的关键弹性性能。结果表明，SCRW的非线性变形集中在SCRW与基础之间的界面上，避免了SCRW内部的损坏。预应力筋提供的恢复力可有效实现自复位能力，残余变形小，SCRW的回弹性能优于整体式SW。另外，SCRW的弧形界面使摇摆中心发生变化并向内移动，部分缓解了混凝土的应力集中和破碎。摇摆中心的摇摆范围约为SCRW宽度的41.4%。