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为研究预应力钢箱高强混凝土组合梁从加载到破坏受扭全过程的力学性能,把受扭全过程分为开裂前和开裂后两个阶段。基于变角空间桁架理论模型,通过受力平衡方程、几何条件和应力-应变关系等,推导出适用于预应力组合箱梁全过程分析的一系列方程,进而提出了预应力钢箱高强混凝土组合梁全过程分析的简化算法,并利用VB编制了预应力钢箱高强混凝土组合梁受扭全过程分析的仿真计算程序,制作了输入和输出的可视化界面。最后,对试验和理论分析结果进行了对比,结果表明方法合理,精度满足要求。
In order to study the mechanical properties of prestressed steel box high strength concrete composite beams from loading to failure, the whole process of torsional deformation is divided into two stages before cracking and after cracking. Based on the theoretical model of variable angle space truss, a series of equations suitable for the whole process analysis of prestressed composite box girder are deduced through the stress balance equation, geometric condition and stress-strain relationship, and then the prestressed steel box high strength concrete combination Beam whole process analysis of the simplified algorithm, and the use of VB prepared prestressed steel reinforced high-strength concrete composite beam torsion full process analysis of the simulation program, the input and output of the visual interface. Finally, the experimental and theoretical analysis of the results were compared, the results show that the method is reasonable and accurate to meet the requirements.