钢管混凝土单圆管肋拱非线性有限元分析

Nonlinear finite element analysis of concrete-filled steel tubular (single tube) rib arch

提出考虑材料与几何双重非线性的钢管混凝土肋拱面内受力的计算方法并编制了有限元程序。有限元建模时采用空间梁单元。材料非线性应用合成法钢管混凝土本构关系。双重非线性采用采用混合法。应用该方法对钢管混凝土模型肋拱的受力全过程进行了分析。计算结果与试验结果比较表明 ,该程序能够反映钢管混凝土肋拱受力全过程的基本特性 ,但在受力的后期有一定的误差 ,表明钢管混凝土肋拱中的材料本构关系有其自身的特点 。

A method is presented to analyze the behavior of concrete-filled steel tubular (CFST) arch, which considers the material and geometric nonlinear property, and a finite element program. In the program, beam element and combined CFST constitutive are used. The method of solution used is that of the mixed procedure (incremental method + modified Newton iteration). Using this method, two CFST model arches are analyzed. Comparisons of numerical results with the test results indicate that, this program can get out the basic mechanic behaviors of the CFST arch on the whole loading progress. However, there is some difference in the final phase which indicates that the material constitutive of the CFST arch has itself property and should be studied more in the further.