单层屈曲约束支撑框架的抗震参数  

Seismic parameters of single-layer buckling-restrained braced frame

作　　者：冯玉龙[1] 吴京[1] 孟少平[1] 付康[1] 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京210096

出　　处：《东南大学学报（自然科学版）》2015年第3期544-549,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51278105);中央高校基本科研业务费专项资金资助项目;江苏省普通高校研究生科研创新计划资助项目(KYLX_0153)

摘　　要：为了给屈曲约束支撑框架设计提供参考,对单层屈曲约束支撑框架的抗震参数进行了研究.通过结构侧移分析,推导出表征该结构体系受力和变形特性的3个关键参数：支撑-框架刚度比、支撑-框架屈服强度比和梁-柱线刚度比.以特定地震动下结构最大位移和残余位移作为评价指标,对结构进行了参数化分析.分析结果表明：当支撑-框架刚度比和梁-柱线刚度比较小时,增大刚度比可以明显减小结构位移;支撑-框架屈服强度比主要对结构的屈服位移和机制影响较大;支撑-框架刚度比、支撑-框架屈服强度比和梁-柱线刚度比的合理值分别为2,0.7和0.45～5.00.据此设计了2个单层算例,并进行了抗震性能分析.结果表明：在结构中,形成了支撑-梁-柱屈服机制;当支撑屈服后,框架承担的剪力比逐渐增大;支撑布置方式对结构顶点位移响应基本无影响,对相邻柱的轴力影响则较大.To provide the design reference for the frame structure with buckling-restrained brace（ BRB）,the seismic parameters of the single-layer buckling-restrained braced frame（ BRBF） structure are studied. By lateral displacement analysis,three key parameters characterizing the structural force and deformation,the BRB-to-frame stiffness ratio,the BRB-to-frame yield strength ratio and the beam-to-column line stiffness ratio,are derived. By taking the maximum displacement and the residual displacement under the specific ground motion as the evaluation indexes,parametric analyses are carried out. The analysis results showthat when the BRB-to-frame stiffness ratio and the beam-to-column line stiffness ratio are small,both kinds of displacements decrease with the increase of the ratios. The BRB-to-frame yield strength ratio influences greatly on the structural yield displacement and mechanism. The reasonable values of the BRB-to-frame stiffness ratio,the BRB-to-frame yield strength ratio and the beam-to-column line stiffness ratio are 2,0. 7 and 0. 45 ～ 5. 00,respectively.Base on these reasonable values,two examples are designed and the corresponding seismic performance is analyzed. The results showthat the BRB-beam-column yield mechanism is formed in the structures. After the BRB yields,the ratio of the shear forces of the frame increases gradually. The layout principle of BRB has almost no obvious influence on the roof displacement response,but affects significantly the axial force of the adjacent columns.

关 键 词：单层屈曲约束支撑框架 抗震参数 合理参数值 布置方式 

分 类 号：TU352.1[建筑科学—结构工程]