拼宽梁桥横向受力及偏载系数分析

摘要:

以某钢-混凝土拼宽连续梁桥为例，研究了不同连接方案形式下拼宽桥的结构力学性能。通过有限元梁格模型对拼宽桥梁进行了横向受力分析，分析结果表明，连接形式对弯矩的影响主要在横向截面中间连接位置处，而对轴力和剪力的影响主要在横向截面的两端处，铰接形式的受力较刚接形式更为不利。同时本文对桥梁拼宽改造前后的偏载系数进行了研究，分析表明拼宽后偏载系数较原先有所降低，建议偏载系数为1.18，可供同类工程参考。

Abstract:

Taking a steel-concrete split-width continuous beam bridge as an example, the structural mechanical properties of the split-width bridge under different connection schemes are studied. Through the finite element grid model, the lateral force analysis of the wide bridge is carried out. The analysis results show that the influence of the connection form on the bending moment is mainly at the middle connection position of the transverse section, and the influence on the axial force and shear force is mainly in the transverse section. At both ends of the hinged joint, the force is more unfavorable than the rigid joint. At the same time, this paper studies the eccentric load coefficient before and after the bridge widening reconstruction. The analysis shows that the eccentric load coefficient after widening is lower than the original one. The recommended eccentric load coefficient is 1.18, which can be used as a reference for similar projects.