摘要
进行了两个空间钢框架的滞回性能试验。框架构件均为宽厚比较大的H形截面,按实际工程尺寸制作。试验结果显示板件宽厚比和柱子轴压比是影响这类结构承载性能的主要因素,构件端部的局部屈曲导致结构破坏的开始并降低了结构的延性和耗能能力。基于试验结构抗震能力及其地震需求的分析,提出了这类钢框架的抗震设计概念:相对小震水平的地震作用,结构弹性设计须留有必要的承载力储备,以保证大震作用下结构的安全性。试验表明,符合这一要求的薄柔构件钢框架的弹性刚度能满足小震时的变形要求,结构的变形能力能满足大震作用下的延性要求。试验结构的数值分析结果与试验结果吻合良好。
Two full-scale spatial steel frames were tested under vertical and cyclic horizontal loads. The frame members are H-shaped steel elements of large width-to-thickness ratios. Testing results show that the width-thickness ratio and the ratio of axial force at columns are the key factors influencing the structural performance of a steel frame composed of members with non-compact elements, it is also shown that structural failure commences with the local buckling at the end of members, which also causes the loss of ductility and energy-dissipating ability of the structure. Based on the analysis of seismic capacity of the specimen, a design concept considering the special features of this type of frames is proposed, i.e. for the sake of the safety in rarely occurred earthquakes, the required resistance of the frame should be kept at a relatively high level as opposed to frequently occurred earthquakes. Test results indicate that the frames meeting the aforementioned requirement have sufficient stiffness and deformation capacity to satisfy the different deformation demands for seismic actions at different hazard levels. Numerical analyses are in good agreement with the experimental measurements.
出处
《土木工程学报》
EI
CSCD
北大核心
2006年第5期51-56,共6页
China Civil Engineering Journal
基金
国家"十五"科技攻关项目(2002BA806B-4-2)
关键词
空间钢框架
滞回性能试验
局部屈曲
薄柔构件
抗震设计
spatial steel frame
testing on hysteretic behavior
local buckling
non-compact member
seismic design
