波形钢腹板PC组合箱梁纯扭性能的非线性分析

在钢筋混凝土变角软化桁架模型薄膜元理论的基础上,提出了针对波形钢腹板PC组合箱梁这种新型桥梁结构的纯扭性能分析模型。在该模型中对该类型箱梁的受力特点进行了合理简化,建立了一组充分满足平衡条件、变形协调条件和材料本构关系的方程,并给出了求解这些方程的有效算法。对部分试件的计算验证表明:该模型可以用于准确预测极限抗扭承载力,同时为混凝土翼板开裂后梁的全过程分析提供了有效途径。

Nonlinear Analysis of Pure Torsion Property for Prestressed Concrete Composite Box Girders with Corrugated Steel Webs

Based on the rotating-angle softened-truss model of reinforced concrete,a nonlinear analysis model for pure torsion property of prestressed concrete composite box girders with corrugated steel webs was developed.In the model,the mechanical characteristics of such girders were taken into account and a series of equations were derived from equilibrium,compatibility and constitutive laws of materials.An efficient algorithm was proposed to solve these simultaneous equations.Through analyzing several specimens available in the literature,it shows that the model can not only predict the limited torsional bearing capacity but also provide effective way of analyzing the entire load-deformation history analysis for beam after concrete flange crack.