钢管混凝土拱肋滞回性能非线性有限元分析

Nonlinear Finite-element Analysis of Hysteretic Behaviors for Concrete Filled Steel Tube Arches

考虑钢管混凝土中钢材与拉压区混凝土的非线性本构关系,引入几何非线性的影响,采用考虑截面特性的空间组合梁单元,建立钢管混凝土构件非线性有限元模型。首先对试验构件进行计算,与试验结果吻合较好,然后深入研究钢管混凝土拱肋竖向弯矩-曲率、纵桥向荷载-位移以及横桥向荷载-位移滞回关系,从中看出钢管混凝土拱肋具有良好的延性和吸能性质,并得出拱肋滞回性能的各种影响因素。

A finite-element model for CFST members with a 3D composite beam fiber element was built taking in to account of the nonlinear constitutive models of steel and concrete under compression and tension, and the geometrical nonlinearities. The theoretical model proves to be valid by comparing the calculating results and the test results on the experimental components, followed by in-depth study on CFST arches＂ hysteretic behaviors of vertical moment-curvature, longitudinal load-displacement and transverse load-displacement relationship. It is eoncluded that CFST arches have reliable capacity of ductility and energy-absorption, and some parameters affecting the hysteretic behaviors of CFST arches are presented.