局部承压矩形钢管混凝土短柱力学性能研究

MECHANICAL BEHAVIORS OF RECTANGULAR CONCRETE-FILLED STEEL TUBE SHORT COLUMNS SUBJECTED TO LOCAL COMPRESSION

基于单调荷载作用下钢材和混凝土的应力-应变关系模型,考虑了材料本构关系的非线性以及不同材料之间的接触关系,采用ABAQUS有限元分析软件,建立了矩形钢管混凝土短柱在局压偏压下的非线性有限元计算模型。计算分析矩形钢管混凝土受局压偏压时的荷载-变形全过程关系曲线,计算曲线与试验曲线吻合较好。通过分析局压面积比、截面含钢率、钢材和混凝土强度以及端板厚度等对钢管混凝土局压力学性能的影响规律,较深入地了解矩形钢管混凝土受局压偏压荷载时的工作机制。最后,在系统参数分析结果的基础上,提出矩形钢管混凝土局压偏压承载力简化计算方法。

Based on the monotonous load function of steel and concretes stress-strain model, considering nonlinearity of construction and contact relations between different materials, a non-linear finite element model of rectangular CFST short columns under different load eccentricity ratio was established by using ABAQUS software. Load de{ormation relationship curves of CFST under local eccentric compression were calculated and analyzed. The calculated curves agree well with the experiment curves. The influences of local compression area ratio, steel ratio, strength of steel and concrete, thickness of end plates and so forth on CFST local compression behavior were analyzed. Finally, based on a systematic parameter analysis, a method of calculating the CFST local eccentric compression bearing capacity was proposed.