预应力混凝土连续梁桥有限元数值模拟及设计探讨

Prestressed Concrete Continuous Beam Bridge Simulation and Design Through Finite Element

通过有限元软件来模拟不同工况下预应力混凝土连续梁桥的疲劳特性。工况1为通过调查统计获得的桥梁运营中实际车辆荷载谱,工况2利用MATLAB生成服从正态分布的车辆荷载,利用ANSYS软件的后处理程序将服从正态分布荷载下的梁桥时间历程瞬态动力来判断梁桥的疲劳特性。研究结果表明:工况2下危险截面材料疲劳寿命低于工况1,危险部位损伤度符合正态分布;预应力混凝土连续梁桥跨中循环次数最多,该位置混凝土正截面承受最大的压应力,造成疲劳损伤最大,桥梁疲劳寿命周期主要取决于混凝土。基于正态分布下的随机车辆荷载谱在预应力混凝土连续梁桥的疲劳分析中更符合实际工况。

In this paper,finite element software is used to simulate the fatigue characteristics of prestressed concrete continuous beam bridge under no operating conditions.Condition through an investigation statistics for the bridge operation of the actual vehicle load spectrum,the working condition of two obey normal distribution vehicle load generated by the MATLAB and ANSYS software of post-processing program will obey normal distribution under the load of girder bridge time process transient power to determine the fatigue characteristics of girder bridge.The results show that the fatigue life surface of the material with dangerous section under condition 2 is lower than that under condition 1.In the prestressed concrete continuous girder bridge across most times,the position of normal section concrete bear the biggest compressive stress,fatigue damage,the largest bridge fatigue life cycle mainly depends on the concrete.The random vehicle load spectrum based on normal distribution is more in line with the actual condition in the fatigue analysis of prestressed concrete continuous beam bridge.