连续梁桥施工常见问题分析及工艺改进分析

Analysis of Common Problems and Process Improvement in Continuous Beam Bridge Construction

连续梁桥设计和施工较为复杂,施工不当极易造成工程安全隐患。基于此,本文以某连续梁桥工程为研究对象,总结了支架高度大、梁的线性度难以控制、支架基础难度大等难点。进一步通过有限元软件建立连续梁桥的三维数值模型,分析了不同荷载工况下连续梁桥的承载力和变形规律,对比了偏载和中载两种工况。研究表明,偏载工况下连续梁桥1#、2#梁处于受力最不利状态,中载工况下连续梁桥2#、3#两片中梁始终处于受力最不利状态,在中载工况下整体工作性能表现比在偏载工况下好;中载工况由于荷载比较对称,其荷载横向分布接近于直线当桥梁出现损伤后的整体工作性能及承载能力也要明显优于偏载工况。

The design and construction of continuous beam bridges are relatively complex,and improper construction can easily cause safety hazards in the project.Based on this,this article takes a continuous beam bridge project as the research object and summarizes the difficulties such as high support height,difficult control of beam linearity,and difficulty in support foundation.Further,a three-dimensional numerical model of the continuous beam bridge was established through finite element software,and the bearing capacity and deformation laws of the continuous beam bridge under different load conditions were analyzed.Two different load conditions,namely eccentric load and medium load,were compared.Research has shown that under eccentric loading conditions,the 1# and 2# beams of the continuous beam bridge are in the most unfavorable stress state,while under medium load conditions,the 2# and 3# middle beams of the continuous beam bridge are always in the most unfavorable stress state.The overall working performance under medium load conditions is better than under eccentric loading conditions.Due to the symmetry of the load,the lateral distribution of the load in the medium load condition is close to a straight line.When the bridge is damaged,the overall working performance and bearing capacity are also significantly better than those in the unbalanced load condition.