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本文针对日益增多的桥梁偏位问题,以陕西省府谷孤山川11号桥的纠偏工程为例,利用有限元程序对弯梁桥的偏位原因、机理及纠偏方法进行了研究,并对依托工程偏位原因进行分析。分析得出:曲线梁桥在使用过程中,由于其周期性使用荷载的作用,会产生可累积的残余位移,造成桥梁较大的偏位。连续曲线梁桥在温度荷载、活荷载等荷载工况下都会不同程度发生横向位移,其中温度荷载对曲线梁桥横纵位移影响最大。固定支座位置是影响曲线梁桥上部结构横向位移重要因素,合理的布设固定支座可以有效降低温度荷载对曲线桥梁横向位移的影响。此外,本文还根据工程实例,介绍了弯箱梁桥梁体复位以及支座更换技术,该方法操作简单,施工安全性高,适合于梁体横向纠偏和支座更换工作。
In this paper, aiming at the increasing bridge misalignment, taking the correction project of No.11 Bridge in Guanshan Valley, Fugu County, Shaanxi Province as an example, the reason, mechanism and correction method of deflection of the bridge with curved beam are studied by means of finite element program. Engineering reasons for bias analysis. The analysis shows that during the process of using the curved beam bridge, due to the cyclic loading, the accumulative residual displacement will be produced, resulting in a large deflection of the bridge. The continuous curved girder bridges will undergo lateral displacement to different extents under load conditions such as temperature load and live load. Among them, the temperature load has the most significant influence on the lateral and longitudinal displacements of the curved beam bridge. The position of the fixed bearing is an important factor that affects the lateral displacement of the upper part of the curved beam bridge. A reasonable arrangement of the fixed bearing can effectively reduce the influence of the temperature load on the lateral displacement of the curved bridge. In addition, based on the engineering examples, this paper also introduces the bending and bending of the bridge box body and the replacement of the support. The method is simple in operation and high in construction safety. It is suitable for the lateral correction of the beam body and the replacement of the support.