连续梁桥顶升受力分析

Analysis on Lifting Stress of Continuous Girder Bridge

采用Midas/Civil软件对连续梁桥顶升过程中由于各顶升千斤顶之间的同步误差而产生的应力进行分析,进而得到顶升过程中的最大容许误差,并以之为依据寻找更加安全的顶升方案。计算过程主要以弹性体力学理论以及有限单元法为依据,通过对各种工况的同步误差产生的不同应力分布进行分析比较,来得出有规律的经验型结果。分析过程以一座简单的等截面连续梁桥为例子,进而推广得到一般性结论。分析了桥梁顶升过程中各顶升点的同步误差对桥体局部应力的影响以及误差的控制范围。连续梁桥属于超静定结构,外加位移会产生附加内力。

The stress produced by the synchronous error among various lifting jacks in the course of lifting the continuous girder bridge is analyzed by Midas/Civil software so as to get the maximumallowable error in the course of lifting,and based on it to seek the safer lifting scheme.The calculation process is mainly based on the elastomer mechanics theory and the finite element method.It is to analyze and compare the different stress distributions caused by the synchronous error under various conditions so as to give the rule of experience result.A simple constant dimension continuous girder bridge is taken as the example to analyze so as to spread and get the general conclusion.The article analyzes the influence of the synchronous error of every lifting point on the partial stress of bridge and the control range of error in the course of lifting bridge girder.The continuous girder bridge belongs to the statically indeterminate structure,and the additional inner force will produce,and the additional displacement will produce the auxiliary inner force.