竖向承载力不规则弯曲型结构抗震延性折减系数研究  

Seismic Ductility Reduction Factor for Flexural-Type Structures with Vertical Irregularities of Bearing Capacity

作　　者：周靖[1,2] 胡小权[1] 王慧英[2] 

机构地区：[1]湘潭大学土木工程系,湖南湘潭411105 [2]华南理工大学亚热带建筑科学国家重点实验室,广东广州510641

出　　处：《湘潭大学自然科学学报》2013年第3期27-33,共7页Natural Science Journal of Xiangtan University

基　　金：湖南省自然科学基金项目(12JJ6047)

摘　　要：研究竖向不规则弯曲型结构的抗震延性折减系数.采用弯曲型多质点系悬臂柱模型,通过修正竖向规则结构的延性折减系数来研究竖向承载力不规则结构的延性折减系数,并分析延性水平、不规则比率和速度脉冲地震效应对修正系数的影响.研究表明:竖向承载力不规则结构的延性折减系数明显小于相应规则结构的延性折减系数,修正系数随不规则比率的减小而减小;速度脉冲地震作用下的修正系数比非速度脉冲地震作用下的修正系数小,且速度脉冲地震效应与不规则比率有交互影响;延性水平对修正系数有一定的影响,但影响规律不显著.最后,通过对计算结果取平均值给出了修正系数的统计值和建议值.Seismic ductility reduction factors for flexural-type structures with vertical irregularities. Based on multi-mass flexural-type cantilever-column models, ductility reduction factors for vertical irregular struc- tures are obtained by modifying those with vertical regular structures through a modification factor, and the influence of ductility ratio, irregularity ratio and velocity pulse-like ground motion on this modification fac- tor are investigated. The results show that ductility reduction factors for bearing irregular systems are clear- ly smaller than those for regular systems, and the modification factors decrease with decreasing irregularity ratio. The modification factors for velocity pulse-like ground motion cases are less than those for non-pulse- like ground motion cases, and there are a few interactions between velocity pulse-like earthquake effects and irregularity ratio. Ductility ratio has indistinctive influences on modification factors. Finally, based on the average results, and statistic modification factors and suggested modification factors are given.

关 键 词：弯曲型结构 延性折减系数 竖向不规则 修正系数 速度脉冲地震作用 

分 类 号：TU318.1[建筑科学—结构工程]