长联大跨连续梁桥结构计算与参数敏感性分析

Structural Calculation and Parameter Sensitivity Analysis of Long-span Continuous Girder Bridge

对一座长联大跨连续梁桥进行数值模拟分析,利用通用有限元软件Midas Civil建立有限元模型,对长联大跨连续梁结构在施工过程中的关键阶段进行应力和位移分析,并得出重要结论。同时对影响桥梁受力状态的各参数进行敏感性分析,并指出预应力、弹性模量、容重是影响桥梁状态的主要参数,而混凝土徐变是不可忽视的重要参数。分析方法和部分结论对同类桥梁的设计和施工具有一定的指导意义。

Numerical simulation analysis of a long-span continuous girder bridge is carried out.A finite element model is established by the general finite element software MIDAS/Civil to analyze the stress and displacement of a long-span continuous girder structure in the key period of construction process.And the important conclusion is obtained.At the same time,the sensitivity of each parameter affecting the stress state of the bridge is analyzed.And it is pointed out that the prestressing,elastic modulus and bulk weight are the main parameters affecting the bridge state,and the concrete creep is an important parameter that cannot be ignored.The analysis methods and some conclusions have some guiding significance for the design and construction of similar bridges.