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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载作用下的力学性能。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梁连接、混凝土开裂后刚度以及变截面梁的抗弯刚度等问题。
An example of a pre-curved beam with variable section was introduced in detail to calculate the method of combining structural bridges with FEM. The mechanical properties of one experimental beam under experimental load were studied by means of finite element method, experimental method and a simplified calculation method. The results of stress and deflection obtained by finite element method are in good agreement with those obtained by experiment and simplified calculation. It is proved that this finite element method can effectively simulate and analyze the composite structural bridges and solve the more difficult concrete and steel beam connection in the composite structural bridge calculation , The stiffness of concrete after cracking and the flexural rigidity of the beam with variable section.