预应力钢混连续梁桥钢混结合段局部应力分析

Analysis on Local Stress of Linked Part of Steel-Prestressed Concrete Composite Continuous Beam Bridge

预应力钢砼混合连续梁桥作为一种新型组合结构,它要求把钢梁和混凝土梁连接成共同受力的连续的结构体系,以便顺畅地传递各种荷载。以某钢-预应力混凝土组合连续梁桥为背景,针对钢混结合部受力复杂的特点,采用空间有限元的分析方法,建立此桥的钢混结合段的局部有限元模型,并在相关荷载工况下进行分析计算。根据计算结果,分析该桥的应力分布情况,结果表明钢混结合部分存在少数应力超过允许值,但是高应力集中于极小的区域,而结构整体上则处于较小较平均的应力状态下,对整个桥梁以及钢混结合段的整体使用性能安全影响很小。

As a new type of structure, steel-prestressed concrete composite continuous beam brigde makes junction of steel box and concrete box beam as its most critical structure, in order to transfer the various loads smoothly. This paper takes a bridge as the background, based on the complex characteristics force of mixing department of long bridge, using the finite element analysis method, established the finite element model of combination of the bridge＇s steel-concrete, calculated under the condition of the relevant load cases. The results show that there is a small number of steel concrete composite section stress exceeding the allowable value, and high stress concentration in the tiny area and the whole structure is in a smaller state of stress, the entire section of the bridge and steel concrete composite performance are safety of overall.