曲线箱梁桥变形及受力影响因素分析

Analysis of Factors Affecting Deformation and Stress of Curved Box Girder Bridge

为研究连续曲线箱梁桥变形及受力影响因素,结合有限元软件建立连续曲线梁桥数值模型,针对不同固结方式、合理跨径、桥梁坡度和桥墩高度对桥梁主梁位移和弯矩的影响规律进行对比分析。分析结果表明:桥梁采用一处墩梁固结时,曲线梁桥主梁变形最小,受力最均匀;随着桥梁跨径增大,主梁位移和弯矩均逐渐增大,跨径布置为5×20m时,桥梁的变形和受力最为适宜;合适的桥梁坡度可以极大减小曲线梁桥受力;曲线桥梁变形与坡度没有直接关系;适宜的桥墩高度可以有效减少桥梁变形;桥墩高度与桥梁受力没有直接关系。研究结果可为曲线箱梁桥设计优化提供理论参考。

For the purpose of studying factors affecting deformation and stress of curved box girder bridge,this paper build continuous curved beam bridge numerical model with finite element software to analyze affecting rules of different consolidation methods,reasonable span,bridge slope and pier height on bridge main beam displacement and bending moment.The result shows that deformation of curved bridge girder is minimum and the stress is uniform when the bridge is consolidated with a pier and beam. With the increasing of span,girder displacement and bending moment both gradually increase.When span is 5×20 m,the deformation and stress become the most suitable condition.Appropriate pier height could reduce the deformation greatly.There is not any direct relationship between the pier height and the stress.The research results could help further with optimization of curved box girder bridge.