钢管混凝土减震框架与钢管混凝土框架-剪力墙结构的对比试验研究

摘要

Two specimens with the same scale of about 1/4 and the same dimension of beam-column were designed. One specimen is a concrete filled steel tube （CFST） frame structure with new triple-steel tube buckling-resistant brace （BRB）, and the other specimen is a CFST frame-RC shear wall structure. The seismic behavior of the specimens was studied by testing under combined axial constant compression and lateral cyclic load. The failure characteristics, hysteretic behavior, skeleton curve, strength degradation, stiffness degradation, energy dissipation capacity and strain of these two structures were analyzed. The results shows that the CFST frame with BRB has the same excellent bearing capacity as the CFST frame-RC shear wall structure, and the CFST frame structure with BRB was significantly improved in the aspects of deformation capacity, ductility and energy dissipation, with the strength and stiffness degradation reduced. The CFST frame with BRB has more reasonable mechanical behavior and failure mode. The seismic performance of the CFST frame structure was effectively improved by the new triple-steel tube BRB.%设计两榀比例为1：4、梁柱构件尺寸相同的试件：一榀为设置新型三重钢管防屈曲支撑的钢管混凝土减震框架，一榀为普通钢管混凝土框架-剪力墙结构。对两个试件进行反复荷载作用下的抗震性能试验，对比分析两种结构的破坏特征、滞回性能、骨架曲线、强度和刚度退化、耗能能力和关键点应变等抗震性能指标。试验结果表明：钢管混凝土减震框架结构具有与钢管混凝土框架-剪力墙结构相当的承载力，并在变形能力、延性和耗能能力等方面均有明显的提高，对刚度退化和强度退化也有明显的缓解，具有更合理的受力性能和破坏机制，新型三重钢管防屈曲支撑起到良好的耗能减震作用，有效地改善钢管混凝土框架的抗震性能。