组合梁桥有限元计算方法

摘要

A FEA method for composite beam bridge is presented by an example of a preflex beam with variable cross -section. An experiment is conducted. FEA results agree well with experimental resuits and proves the FEA method to be an effective way to solve the most difficult problems in calculation of composite beam, such as contact and interaction between concrete and steel web, eoncrete cracking,concrete post-cracking stiffness and bending stiffness of beam with variable cross - section.%采用了一个变截面预弯梁的例子详细介绍了用有限元计算组合结构桥梁的方法.通过有限元方法、试验方法以及一种简化计算方法研究了一片实验梁在实验荷栽作用下的力学性能.有限元计算获得的应力、挠度结果与实验及简化计算方法所得结果吻合良好,证明这一有限元方法可以有效的模拟分析组合结构桥梁,并解决组合结构桥梁计算中较为困难的混凝土与钢粱连接、混凝土开裂后刚度以及变截面梁的抗弯刚度等问题.