混凝土连续梁桥空心墩墩顶局部应力分析

大跨度预应力混凝土连续梁桥桥墩是结构的关键部位之一,桥墩墩顶截面的受力很复杂。本文通过建立某连续梁桥空心墩的空间有限元模型,分析了空心墩在竖向荷载及温度荷载作用下的墩顶局部应力分布特征,指出在墩顶对称轴附近存在较大拉应力,特别在墩实体过渡段下部;而且在骤然降温时,桥墩外表面出现较大横向拉应力。因此要注意配筋,防止出现裂缝。

Analysis of Partial Stress of Concrete Continuous Beam Bridges on the Top of Hollow Pier

Pier is an important part of the longspan PC (prestressed concrete) continuous beam bridge;the mechanics state of the top section of the pier is very complicated.This paper established a dimensional finiteelement model of the hollow pier of some continuous beam bridges.The partial stress distributing character is analyzed under vertical load and temperature load in this paper.It is pointed out that the bigger tensile stress appears in the vicinity of the symmetrical axis of the pier coping,especially under the transition part,furthermore,when the temperature descends suddenly,the bigger traverse tensile stress occurs on the surface of the pier.So we must pay attention to configuring steels and prevent cracking.