钢箱梁桥支座脱空成因分析及处理方案研究

Cause Analysis and Treatment Schemes for Bearing Void of Steel Box Girder Bridge

摘要:

为了研究实际工程中梁桥支座出现的脱空情况，以某钢箱梁桥为例，针对其出现的支座脱空问题，应用有限元软件MIDAS进行成因分析并提出处理方案。通过对比支座脱空量大小、平面位置和标高变化情况与软件算出的支反力分析情况，结果表明理论计算与实际观测情况基本相符。基于脱空现象成因，提出的处理方案包括对脱空的支座进行维护保养、尽快浇筑配重混凝土和持续监测钢箱梁的变形、位移等重要数据，处理后效果符合预期，为钢箱梁桥支座脱空现象的处治提供了参考。

Abstract:

In order to study the occurrence of bearing voids in actual engineering of beam bridges, taking a steel box girder bridge as an example, the causes of bearing voids are analyzed by using finite element software MIDAS and the treatment scheme is proposed. By comparing the size of the bearing voids, the plane position, and the elevation changes with the analysis of the bearing reaction force calculated by the software, the results show that the theoretical calculation is basically consistent with the actual observation situation. Based on the causes of the void phenomenon, the proposed solution includes the maintenance and upkeep of the void bearings, pouring of counterweight concrete as soon as possible, and continuous monitoring of important data such as deformation and displacement of the steel box girders. The treated effect meets the expectations and provides a reference for the treatment of the phenomenon of bearing voids in steel box girder bridges.