【摘要】 为了更好地研究矩形钢管混凝土柱的力学性能,在以往试验和理论研究的基础上,提出一种适用于任意截面形状的三节点八自由度单元模型.结合混凝土和钢材的本构关系建立了非线性有限元模型,用于对单调和反复加载受力方案进行计算分析.对包括纯弯、轴压、偏压和低周反复荷载等多种受力模式下的矩形钢管混凝土试件进行计算,并与试验结果进行比较,两者较为吻合,证明所提出的非线性有限元分析方法可以较好地模拟矩形钢管混凝土的受力和变形性能.更多还原

【Abstract】 In order to study the mechanical behavior of concrete-filled rectangular steel tubular columns,an unit mode with eight degrees of freedom(DOF) and three nodes,applicable to any kind of sectional shape,was proposed based on the past experimental and theoritical researches.In combination with the constitutive relation between concrete and steel,a nonlinear finite element model was established,and was used for the calculation analysis on force schemes with monotonic and repeated loading.The concrete-filled rectangular steel tubular specimens under various force modes such as pure bending,concentric compression,eccentric compression and low-cycle repeated loads were calculated.It is found through comparison that the calculated results are consistent with the experimental ones.It proves that the proposed nonlinear finite analysis method can better simulate the force and deformation behaviors of concrete-filled rectangular steel tubular.更多还原