大跨度连续刚构桥长期下挠影响参数分析

The Analysis of the Impact Parameters for Long-term Deflection of Long-span Continuous Rigid Frame Bridge

跨中下挠是大跨度预应力混凝土连续刚构桥常见病害,挠度的不断增大严重影响了桥梁的使用寿命及正常运营。以影响大跨预应力混凝土连续刚构桥主跨跨中长期下挠的影响参数为研究核心,以某二级公路上的一座特大桥为项目背景,建立有限元实桥模型,采用定量计算和定性分析的方法,分析各影响参数对下挠的灵敏性从而得出一些重要的结论,对全面认知大跨预应力连续刚构桥主梁长期下挠的原因以及制定一套行之有效的控制跨中长期下挠的工程措施具有一定的借鉴意义。

Mid-span deflection was a common disease of the long-span PC continuous rigid frame bridge,and the increasing deflection seriously affected the life of the bridge,as well as normal operation.The core research of this essay was based on impact parameters for the mid-span continuing deflection of long-span PC continuous rigid frame bridge.Based on the background of a specially long span bridge of a second class highway to create the finite element model,the essay used the quantitative calculation and qualitative analysis method to analyze various parameters sensitivity,and the impact lever of various parameters to deflection so as to arrive at a number of important conclusions,which can help to completely know the reason of sustaining deflection of long span PC continuous rigid bridge,and can have a certain reference to make a series of methods to control the mid-span sustaining deflection.