ABSTRACT

The integrity of precast concrete (PC) shear walls depends strongly on the structural measures and construction quality of the reinforcement connections, which impedes complete equivalence with cast-in-place connections, the construction height, and the applicability to high-seismicity regions. The seismic behaviour of hybrid precast concrete-encased concrete-filled twin steel tube (PCCS)-reinforced composite shear walls was investigated under combined vertical tension and horizontal cyclic loading. Embedded cast-in-place high-strength concrete-filled thin-walled twin steel tube cores (HCSCs) were used to position a PC shear wall panel and stiffen vertical connections for improved load-bearing. Quasi-static cyclic tests were conducted on six PCCS composite shear wall specimens with a shear-span ratio of 1.84 to investigate how the HCSC cross-section ratio, out-of-plane eccentricity, and initial axial tension affected the seismic performance. The specimens failed by combined shear-bending, and the HCSCs served as reliable connections and reinforcements. The specimens exhibited relatively high load-bearing capacities, complete hysteretic curves, good deformation and energy dissipation, and large residual stiffnesses at failure. Shear deformation contributed approximately 21% to the total lateral displacement. The average ultimate drift ratio of 1/42 and average ductility factor of 5.0 of the specimens demonstrated excellent assembly integrity. A parametric analysis of the bearing capacity of the cross-section revealed that as the HCSC cross-section ratio increased, both the shear capacity and lateral stiffness increased, where the latter produced a rapid decrease in the deformation curvature. The shear capacity decreased with increasing initial axial tension and out-of-plane eccentricity. The deformation curvature was increased using an appropriate axial tension level and deteriorated by the out-of-plane eccentricity.

摘要

预制混凝土（PC）剪力墙的完整性在很大程度上取决于钢筋连接的结构措施和施工质量，这阻碍了与现浇连接的完全等效性、施工高度以及对高地震地区的适用性。研究了混合预制混凝土包裹混凝土填充双钢管（PCCS）增强复合剪力墙在垂直拉伸和水平循环荷载组合下的抗震性能。嵌入式现浇高强混凝土填充薄壁双钢管c矿石 (HCSC) 用于定位 PC 剪力墙板并加强垂直连接以提高承载能力。对6个剪跨比为1.84的PCCS复合剪力墙试件进行准静态循环试验，研究HCSC截面比、面外偏心率和初始轴向张力对抗震性能的影响。试件因组合剪切弯曲而失效，HCSC 用作可靠的连接和加强件。试件具有较高的承载能力、完整的滞后曲线、良好的变形和能量耗散以及较大的破坏残余刚度。剪切变形对总横向位移的贡献约为 21%。平均极限漂移比为 1/42，平均延性系数为 5。0 个样本表现出出色的组装完整性。截面承载力的参数分析表明，随着 HCSC 截面比的增加，抗剪能力和侧向刚度都增加了，而后者导致变形曲率迅速减小。抗剪能力随着初始轴向张力和面外偏心率的增加而降低。使用适当的轴向张力水平会增加变形曲率，并因面外偏心而恶化。抗剪能力随着初始轴向张力和面外偏心率的增加而降低。使用适当的轴向张力水平会增加变形曲率，并因面外偏心而恶化。抗剪能力随着初始轴向张力和面外偏心率的增加而降低。使用适当的轴向张力水平会增加变形曲率，并因面外偏心而恶化。