新型外包钢－混凝土组合梁受扭的非线性有限元分析

Non-linear analysis of torsion on steel-encased concrete T-composite beams

基于5根新型外包钢-T形截面混凝土组合梁受纯扭作用的试验成果,采用ANYSY参数化程序设计语言(APDL)编制了命令流,对纯扭作用下组合梁的受扭性能进行了非线性有限元分析(FEM)。FEM分析考虑了钢筋和混凝土间的相互作用,以及外包钢和混凝土间的相互作用,较好地模拟了新型外包钢—混凝土T形截面组合梁以及T形截面钢筋混凝土梁受扭构件的受力、破坏全过程。模拟得到构件的扭矩-扭率关系曲线以及构件的极限扭矩与试验结果吻合较好,验证了所建模型分析组合梁受扭全过程分析方法的可行性,以及所编制的APDL命令流程序对组合梁受扭计算的有效性,为组合梁受扭设计提供了实用的计算软件。

Five specimen of steel-encased concrete T-composite beams,which had varied stirrup ratio,were analyzed using the nonlinear three-dimensional finite element method （FEM）.Analysis of the specimen was conducted after testing to determent the behavior of the specimen. FEM analysis that took into consideration the interaction between the reinforcement and concrete and that between the steel and concrete simulated the behavior of the damage and torsion well of composite beams and reinforced Concrete beam.The curve of T-θ＇ and ultimate torgue Contrast between FEM and test result Show that model can Correct Simulate the entire process of torsion,the APDL order flow is right for Torsion Calculation and FEM is a Practical Software.