梁柱退化和剪力比对自定心BRB双重体系抗震性能的影响

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摘要自定心屈曲约束支撑(SC-BRB)双重体系由抗弯框架和SC-BRB框架组成。分别采用考虑梁柱退化和不考虑梁柱退化两种建模方式建立不同剪力比(抗弯框架部分承担剪力与设计基底剪力之比)的SC-BRB双重体系的分析模型，并通过非线性静力分析和动力时程分析研究了梁柱退化和剪力比对SC-BRB双重体系抗震性能的影响，结果表明：考虑梁柱退化会减小结构的基底剪力，减弱相邻楼层侧向刚度突变的影响，并可能改变最大层间位移角沿结构高度的分布，但会引起结构残余变形的增大；而剪力比的增大会提高梁柱退化的影响，并使结构整体的旗帜形滞回特征减弱，但能有效减小地震时结构的最大层间位移角和变形集中效应。

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	谢钦
	周臻
	孔祥羽
	孟少平

关键词 ：自定心, 梁柱退化, 剪力比, 双重体系, 抗震性能

Abstract：

Self-centering bucklingrestrained brace (SC-BRB) dual systems are composed of moment resisting frames and SC-BRB frames. The analysis models of SC-BRB dual systems with different shear ratio (the ratio of shear bear by moment resisting frame to the design base shear) were built by adopting two kinds of modeling methods, considering beamcolumn degradation and without considering beamcolumn degradation, respectively. The nonlinear static analysis and dynamic time history analysis were conducted to investigate the influence of beamcolumn degradation and shear ratio on seismic performance of SC-BRB dual systems. The result demonstrates that considering beamcolumn degradation will decrease the structural base shear, and weaken the influence of the lateral stiffness mutation between adjacent floors, which may change the peak story drift ratio distribution along the structure height, but increase the residual deformation of structures; the increasing of shear ratio will increase the influence of beam-column degradation, and weaken the flag shape hysteretic characteristic of the whole structures, but can effectively decrease the peak story drift ratio and deformation concentration effect of structures under earthquake.

Key words： self-centering beam-column degradation shear ratio dual system seismic performance

收稿日期: 2016-12-29 出版日期: 2018-04-18

引用本文:

谢钦，周臻，孔祥羽，孟少平. 梁柱退化和剪力比对自定心BRB双重体系抗震性能的影响[J]. 振动与冲击, 2018, 37(8): 9-16.
XIE Qin, ZHOU Zhen, KONG XiangYu, MENG Shaoping. The effect of beam-column degradation and shear ratio on seismic performance of self-centering BRB dual systems. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(8): 9-16.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2018/V37/I8/9

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