摘要
为探究钢管混凝土柱抗震性能及累积损伤机理,对其进行以低周往复加载的有限元分析,变化参数为λ=35、52、63。结果表明,应力主要集中于柱脚区域,长细比增大显著降低初始刚度,λ=63的试件承载力下降幅度较λ=35的试件减小15%;截面长宽比增大显著提升初始刚度,A/B=1.5试件下降段斜率较截面A/B=1试件增加35%,由刚度退化可知累积损伤集中于位移角为1/100~1/66 rad,揭示了高轴压比试件在位移角1/100 rad后刚度退化加剧的非线性演化规律。研究可为工程抗震提供参考依据。
In order to explore the seismic performance and cumulative damage mechanism of concrete-filled steel tubular columns,the finite element analysis of concrete-filled steel tubular columns under low-cycle reciprocating loading is carried out.The parameters areλ=35、52、63.The results show that the stress is mainly concentrated in the column base area,and the increase of slenderness ratio significantly reduces the initial stiffness.The bearing capacity of the specimen withλ=63 decreases by 15%compared with that of the specimen withλ=35.The increase of the length-width ratio of the section significantly increases the initial stiffness.The slope of the descending section of the A/B=1.5 specimen is 35%higher than that of the A/B=1 specimen.From the stiffness degradation,it can be seen that the cumulative damage is concentrated in the range of displacement angle from 1/100 to 1/66 rad,which reveals the nonlinear evolution law of the stiffness degradation of the high axial compression ratio specimen after the displacement angle of 1/100 rad.It provides a reference for engineering earthquake resistance.
作者
杨圣春
赵君燃
YANG Shengchun;ZHAO Junran(College of Civil Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,China)
出处
《四川建材》
2025年第10期105-107,110,共4页
Sichuan Building Materials
关键词
钢管混凝土柱
刚度退化
长细比
有限元分析
concrete filled steel tube column
rigidity degeneration
slenderness ratio
finite element analysis
