陈乐川, 程欣, 陈以一. 考虑局部屈曲的H形截面钢构件单轴压弯恢复力模型研究[J]. 工程力学, 2021, 38(4): 80-92. DOI: 10.6052/j.issn.1000-4750.2020.05.0326
引用本文: 陈乐川, 程欣, 陈以一. 考虑局部屈曲的H形截面钢构件单轴压弯恢复力模型研究[J]. 工程力学, 2021, 38(4): 80-92. DOI: 10.6052/j.issn.1000-4750.2020.05.0326
CHEN Le-chuan, CHENG Xin, CHEN Yi-yi. RESEARCH ON RESTORING FORCE MODEL OF H-SECTION STEEL MEMBERS UNDER UNIAXIAL COMPRESSION AND BENDING CONSIDERING LOCAL BUCKLING[J]. Engineering Mechanics, 2021, 38(4): 80-92. DOI: 10.6052/j.issn.1000-4750.2020.05.0326
Citation: CHEN Le-chuan, CHENG Xin, CHEN Yi-yi. RESEARCH ON RESTORING FORCE MODEL OF H-SECTION STEEL MEMBERS UNDER UNIAXIAL COMPRESSION AND BENDING CONSIDERING LOCAL BUCKLING[J]. Engineering Mechanics, 2021, 38(4): 80-92. DOI: 10.6052/j.issn.1000-4750.2020.05.0326

考虑局部屈曲的H形截面钢构件单轴压弯恢复力模型研究

RESEARCH ON RESTORING FORCE MODEL OF H-SECTION STEEL MEMBERS UNDER UNIAXIAL COMPRESSION AND BENDING CONSIDERING LOCAL BUCKLING

  • 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。

     

    Abstract: 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 width-thickness 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 and energy 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.

     

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