摘要
考虑局部屈曲影响的恢复力模型是对薄柔框架结构进行抗震分析的基础。为得到H形截面钢构件绕不同主轴压弯的截面层次的弯矩-曲率恢复力模型,对薄柔H形截面钢构件单轴压弯的滞回性能进行了有限元参数分析。基于试验及参数分析结果,建立了考虑板件局部屈曲相关作用引起的各项退化的恢复力模型,该模型按照退化阶段加载刚度是否有滞升现象分成两种退化模型,绕强轴压弯与腹板有屈曲的绕弱轴压弯采用一般退化模型,腹板无屈曲的弱轴压弯采用刚度滞升模型。通过与多个不同宽厚比、轴压比组配截面的试验与有限元分析结果进行对比,证明了所提恢复力模型正确性与适用性。该文提出的模型体现了薄柔H形截面在屈曲后仍具有一定的延性和耗能能力,这表明在抗震设计中是可以利用的,为轻钢体系建筑的性能化设计提供了设计依据。
It is the basis of elastic-plastic time-history analysis in seismic analysis of the thin-walled frame structures that the effect of local buckling must be considered in the restoring force model. In order to obtain the moment-curvature relationship of a H-section member under cyclic bending about different axes, the hysteretic properties of uniaxial compression and bending of a thin-walled H-shaped section member were analyzed by FEM. Based on the results of tests and of parameter analysis, a restoring force model was established considering the degradation caused by local buckling and by plate interaction effect. The model is divided into two degradation models according to whether there is increased reloading stiffness in the degradation stage. The first type, the general degradation model, was used for the bending around the weak axis with buckled-web and the bending around a strong axis. The second type, increased reloading stiffness model, was used for the bending around the weak axis with unbuckled-web. The correctness of the proposed restoring force model is verified by comparing the results of tests and of numerical analyses with those of multiple cross sections with different widththickness ratios and axial compression ratio. The comparison ensures the accuracy and applicability of the model. The model and conclusion presented show that the thin-walled H-section member has a certain ductility andenergy dissipation capacity after buckling. This shows that it can be used in seismic design, and provides a design basis for the performance-based design of light steel system buildings.
作者
陈乐川
程欣
陈以一
CHEN Le-chuan;CHENG Xin;CHEN Yi-yi(College of Civil Engineering,Taiyuan University of Technology,Shanxi 030024,China;State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)
出处
《工程力学》
EI
CSCD
北大核心
2021年第4期80-92,共13页
Engineering Mechanics
基金
国家自然科学基金项目(51978437)
山西省高等学校科技创新项目(2019L0122)。
关键词
钢构件
H形截面
恢复力模型
单轴压弯
局部屈曲
steel members
H-section
restoring force model
uniaxial beam-columns
local buckling
