V墩波形钢腹板连续刚构桥中跨合龙段顶推力计算与分析

Calculation and Analysis of Thrust Force of Middle Span Closure Section of V-Pier Corrugated Steel Web Continuous Rigid Frame Bridge

合龙顶推对大跨径V墩波形钢腹板连续刚构桥力学性能与位移有一定影响,论文结合实际工程,分析了混凝土收缩与徐变造成的V墩墩顶位移、V墩墩底弯矩及墩底轴力、V墩墩身裂缝,并采用桥梁博士V4有限元软件建立不同跨中合龙顶推力状态下的有限元模型,分析了在各种跨中合龙顶推力的情况下,V墩波形钢腹板连续刚构桥V墩的力学性能与位移。研究结果表明,在跨中合龙前施加顶推力可以有效减小收缩徐变使V墩产生的位移及内力,改善桥梁受力。

Closure pushing has certain influence on the mechanical properties and displacement of long-span V-pier continuous rigid frame bridge with corrugated steel webs. Combining with practical projects, the paper analyzes the displacement of V-pier top, the bending moment of V-pier bottom, the axial force of V-pier bottom and the cracks of V-pier body caused by concrete shrinkage and creep. The finite element model of V-pier in different thrust state of mid-span closure was established by using Dr. Bridge V4 finite element software. The mechanical properties and displacement of V-pier in continuous rigid frame bridge with corrugated steel web were analyzed under different thrust state of mid-span closure. The results show that applying the top thrust before the mid-span closure can effectively reduce the displacement and internal force of V-pier caused by shrinkage and creep, and improve the force of the bridge.