考虑失稳效应的角钢非线性滞回模型研究  

Nonlinear hysteretic model of angle steel considering instability effect

作　　者：刘俊才 田利[1] 毕文哲 刘文棚 孟祥瑞 LIU Juncai;TIAN Li;BI Wenzhe;LIU Wenpeng;MENG Xiangrui(School of Civil Engineering,Shandong University,Jinan 250061,China)

机构地区：[1]山东大学土建与水利学院,山东济南250061

出　　处：《振动与冲击》2022年第23期19-26,35,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(51578325,51208285);山东大学青年学者未来计划项目(2017WLJH33)。

摘　　要：选取不同截面尺寸、长细比和两端约束的等边角钢,开展循环加载试验,研究角钢在低周循环拉压荷载下的滞回行为。基于角钢的滞回特性,考虑受压屈曲效应和塑性应变累积效应,提出了一种非线性滞回模型,通过参数分析对该滞回模型中的关键参数进行拟合与优化。通过与加载试验结果进行对比,验证了该滞回模型能够真实地呈现出角钢在轴向循环拉压荷载下复杂的非线性物理特性:受拉屈服及应变硬化现象、受压屈曲及后屈曲行为、反向受拉加载时的刚度退化现象和受压屈曲承载力退化现象,具有良好的模拟能力且提高了计算效率,为角钢非线性滞回行为的预测研究提供高效且可靠的分析方法。Here, equilateral angle steels with different cross-section sizes, slenderness ratios and constraints at both ends were selected to conduct cyclic loading tests, and study hysteretic behavior of angle steel under low cyclic tension and compression loads. Based on hysteretic characteristics of angle steel, considering compression buckling effect and plastic strain accumulation effect, a nonlinear hysteretic model was proposed, and key parameters in this hysteretic model were fitted and optimized through parametric analysis. By comparing with the loading test results, it was shown that the proposed hysteretic model can truly reveal complex nonlinear physical characteristics of angle steel under axial cyclic tension and compression loads: tensile yield and strain hardening, compression buckling and post buckling behavior, stiffness degradation under reverse tension loading and compression buckling capacity degradation;the proposed model can have a good simulation ability and improve calculation efficiency;it can provide an efficient and reliable analysis method for predicting nonlinear hysteretic behavior of angle steel.

关 键 词：角钢 滞回行为 非线性滞回模型 循环加载试验 屈曲承载力 

分 类 号：TU392.1[建筑科学—结构工程]