摘要
目前钢管混凝土扭转刚度和剪切模量的计算公式相当复杂,而且完全基于有限元回归拟合所得。首先从理论上对钢管混凝土受扭过程进行了分析,分别采用经典弹性理论和等效空间桁架模型,把钢管混凝土的扭转过程分为3个阶段,即弹性阶段、弹塑性阶段和塑性强化阶段,得到了相应的扭转刚度和等效剪切模量的理论公式;然后通过有限元分析,拟合给出了对理论公式的修正意见。
Currently,the formulas for calculating the shear modulus and torsion rigidity of CFST are very complicated and mostly got by regression analysis. In this paper, using classical elastic theory and the equivalent space truss model, the process of twisting is analyzed theoretically and divided into three stages：elastic stage, elasto-plastic stage, plastic stage. Then the theoretical formulas of equivalent torsion stiffness and shear modulus were obtained. Finally using fitting method, this paper gives modifications of the theoretical formulas with finite element analysis.
出处
《建筑钢结构进展》
北大核心
2012年第3期1-7,共7页
Progress in Steel Building Structures
