基于屈服点谱的钢筋混凝土框架-剪力墙结构抗震设计

Seismic design of reinforced concrete frame-shear wall structure based on yield point spectra

以设防地震下"生命安全"和罕遇地震下"防止倒塌"为结构性能目标,采用结构位移角和墙肢基底塑性转角为性能控制指标,对钢筋混凝土框架-剪力墙结构进行基于位移的抗震设计。通过等效单自由度体系,估计框架-剪力墙结构体系第一振型的等效屈服位移,并利用加速度反应谱构造考虑非弹性需求的屈服点谱,确定结构最大基底剪力。总框架与总剪力墙承担的基底剪力比例可人为假定,各墙肢所承担的弯矩值按与墙肢实际或等效截面高度的平方成正比进行分配。以某10层钢筋混凝土框架-剪力墙结构为例,详细阐述了建议方法的设计过程,并利用PERFORM-3D软件对其进行动力时程分析,通过分析结果与设计预期的对比,表明了该设计方法对一定层数范围内的结构非弹性性能设计,具有一定的参考意义。

According to the multiple performance objectives including the Life Safety objective under moderate earthquake and the Collapse Prevention objective under rare earthquake,a displacement-based seismic design method was presented for the reinforced concrete( RC) frame-shear wall structure. For each performance level,roof drift,interstory drift of the structure and plastic hinge rotation at the base of the wall were selected to be the primary performance parameters. An nominal yield displacement corresponding to the first mode of structure was estimated based on the equivalent single-degree-of-freedom( ESDOF) system, then the required maximum base shear force was determined by using Yield Point Spectra( YPS) considering the inelastic demand,which is formed by the acceleration response spectrum. The base force proportion taken by total frame and total shear wall may be assumed by designers and engineers,and the nominal bending moment for each wall branch was assigned in proportion to the square of actual or equivalent length of wall. A ten-story RC frame-shear wall structure was taken as an example to demonstrate the design process of the method in detail. Furthermore,subsequent nonlinear dynamic analyses were performed using the computer program PERFORM-3D. The analysis results show that the proposed method is sufficiently accurate for design,and can be referred for the inelastic structural design within a certain range of building floors.