竖向收进钢筋混凝土框架-剪力墙结构抗震性能研究

Seismic performance of RC frame-shear wall structures with vertical setback

框架-剪力墙结构在高层建筑中有较广泛的应用。为满足各种使用和外观要求,实际工程中经常会出现竖向收进的结构。本文采用数值模拟的方法对竖向收进的钢筋混凝土框架-剪力墙结构的抗震性能进行了研究。根据现行规范的要求设计了1个20层无收进的竖向规则框架-剪力墙结构(基准结构)和15个竖向收进框架-剪力墙结构。15个竖向收进结构按水平收进尺寸比例、竖向收进高度、收进方式分为3组。利用通用结构分析软件PERFORM-3D建立了这些结构的非线性数值计算模型,对结构进行了三个水准7组地震波输入下的动力时程分析。分析了竖向收进造成结构层间位移角突变以及结构构件的损伤情况,研究了水平收进比例、竖向收进高度、收进方式对竖向收进结构抗震性能的影响规律。

The frame-shear wall structure is widely used in high-rise buildings. In order to meet multiple requirements of usage and architectural appearance, the structures with vertical setback often appear in practice. In this paper, the seismic performance of reinforced concrete frame-shear wall structures with vertical setback is studied by numerical simulation.According to the requirements of current codes, one 20-story vertically regular frame-shear wall structure(reference structure) and 15 vertically irregular frame-shear wall structures are designed. Furthermore, 15 vertical setback structures are divided into three groups according to the horizontal setback ratio, the vertical setback height, and the setback pattern.The nonlinear numerical models of these structures are established by the general structure analysis software PERFORM-3 D, and the dynamic time-history analysis is carried out with the input of seven groups of seismic waves with three seismic intensity levels. The abrupt change of drift ratio and the damage of structural components caused by vertical setback are further analyzed. The influence of horizontal setback ratio, vertical setback height, and setback pattern on the seismic performance of the structures are studied.