侧移曲线对基于位移设计的多层自复位摩擦耗能支撑钢框架抗震性能影响研究  

INFLUENCE OF LATERAL DISPLACEMENT CURVE ON THE SEISMIC PERFORMANCE OF MULTI-STORY SELF-CENTERING FRICTION ENERGY DISSIPATION BRACED STEEL FRAMES BASED ON DISPLACEMENT DESIGN

作　　者：徐龙河[1] 杨雪飞 XU Long-he;YANG Xue-fei(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学土木建筑工程学院

出　　处：《工程力学》2019年第12期198-205,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(51578058);北京市自然科学基金项目(8172038)

摘　　要：采用直接基于位移的抗震设计方法时需预先确定结构的侧移曲线,但侧移曲线对设计结果和结构抗震性能的影响有待研究,为此该文以自复位摩擦耗能支撑钢框架为例,考虑结构非线性程度和层数,分析了3种典型侧移曲线对结构抗震性能的影响,为该类支撑钢框架结构的侧移曲线选择提供依据。结果表明:侧移曲线对3层支撑框架的基底剪力设计值影响不大,但对6层支撑框架的基底剪力有明显影响;楼层设计位移角随设计侧移曲线变化而变化,最终导致楼层设计刚度差别较大;3层以下低层自复位摩擦耗能支撑钢框架结构的实际侧移表现为线型,设计时建议采用线型侧移曲线,6层左右的多层结构的实际侧移表现为弯曲型,建议采用弯曲型侧移曲线进行设计。The lateral displacement curve needs to be defined in advance when employing the direct displacement-based seismic design method,and the influence of the curve on the design results and the seismic performance of the structure require further study.Taking the self-centering friction energy dissipation braced steel frames as examples,and considering the structural nonlinearity and the number of stories,the influence of three typical lateral displacement curves on the seismic performance of the structures was analyzed.Results showed that the lateral displacement curve had little effect on the design base shear force of the 3-story braced frame,but had a noticeable effect on the base shear force of the 6-story structure.The design values of inter-story drift ratio varied with the lateral displacement curve,resulting in a great change in story design stiffness.The actual lateral displacement curve was linear-type and bending-type for 3-story braced frame and the 6-story structure,respectively.It is recommended that the linear-type displacement curve could be used for the low-story structure below 3-story and the bending-type displacement curve for the multi-story structure about 6-story.This study is expected to provide a reference for the selection of lateral displacement curves of this type of braced steel frame structures.

关 键 词：直接基于位移的抗震设计 侧移曲线 自复位支撑结构 性能水平 时程分析 

分 类 号：TU318[建筑科学—结构工程] TU352.1