约束扭转状态下钢管混凝土抗扭承载力的有限元建模及参数分析

Finite Element Modeling and Parameter Analysis on Ultimate Torsion Bearing Capacity of CFST under Restrained Torsion

随着建筑结构跨度的不断增加以及形式的多样化发展,使建筑物抗扭性能的研究变得尤为重要.运用大型有限元通用软件ANSYS建立约束扭转状态下钢管混凝土构件的有限元实体模型,模拟其受扭全过程的荷载-位移曲线,并对该有限元模型进行验证.在此基础上,选取含钢率、钢材屈服强度、混凝土强度和长细比作为参数进行有限元参数分析,探讨这4个参数与抗扭承载力的相关关系.结果表明:长细比对约束扭转状态下的钢管混凝土抗扭性能有一定的影响,混凝土强度和钢材强度对抗扭承载力的影响基本是独立的,而混凝土对钢管混凝土抗扭承载力的影响不能忽略.

The research on the uhimate torsion bearing capacity is becoming more important with the increasing span of architectural structure and diversified structural style. Finite element software ANSYS was utilized to simulate the torsion-deformation curves during the process of whole loading when Concrete Filled Steel Tubular （CFST） member under restrained torsion. Based on the verified finite element model, four parameter, namely steel ratio, steel yield strength, concrete strength and slenderness ratio are under consideration of the relationship with the torsion capacity of CFST member under restrained torsion. From the analysis result, slenderness ratio has some influences on the torsion bearing capacity of CFST member under restrained torsion, and the influence to the torsion bearing capacity of CFST member has no relativity between concrete strength and steel yield strength, also the influence of core concrete can not be ignored.