钢管混凝土构件受扭有限元非线性分析方法

Nonlinear finite element methods on torsional mechanism for concrete filled steel tube

以钢管混凝土单圆管构件扭转试验为基础,采用有限元实体单元建模,选取适用于钢管混凝土有限元实体模型的混凝土本构关系,建立了钢管混凝土构件扭转受力的有限元非线性分析方法.通过与构件受扭试验结果的对比,验证了此有限元非线性分析方法的准确性.同时,对试件抗扭极限承载力计算结果的比较表明,采用此分析方法与简化实用公式两种方法得到的极限承载力计算结果较为符合.

Based on experimental study on circular shape sections of concrete-filled steel tubular members under torsional loads,solid element was adopted to build finite element model.By choosing the constitutive relationships of core concrete applied to finite element solid model,it built the nonlinear finite element method for study on torsional mechanism.By comparisons of finite element and experimental results,the accuracy of this finite element method was verified.In addition,the calculated results of torsional carrying capacity by presented FE method and simplified formula were consistent.