预应力钢-混凝土组合箱梁弯扭全过程研究

Whole-course study on bending-torsion behavior of prestressed steel-concrete composite box-beam

为了探讨复合弯扭作用下预应力组合箱梁的受力特性,对其进行了弯扭全过程研究。通过引入预应力影响系数和弯矩影响系数,建立了开裂前预应力组合箱梁复合弯扭作用下扭矩、扭转角计算公式。由受力平衡条件和变形协调条件,建立了开裂后预应力组合箱梁复合弯扭作用下的非线性全过程分析方法。结合试验研究,给出了全过程分析流程图,并与试验所测结果进行了对比分析。分析表明,其误差在22%以内,吻合良好。

In order to explore mechanical properties of the prestressed composite box-beam under combined bending and torsion,the whole-course study is launched in this paper. The formulas of torque and torsion angle of prestressed composite box-beam are obtained under combined bending and torsion by introducing prestressed influence coefficient and moment coefficient. And then,based on the theory of space truss with variable angle,the method of nonlinear full-range analysis of prestressed composite box-beam is discovered after cracking of concrete flange. Combined with experimental study,the flow chart of whole-course study is deduced and analysis between test and theory is launched as well. The results show that the maximum error is less than 22% and the calculation values are consistent with the experiment results.