城市人行桥加固方案设计探讨

Discussion on the Design of Urban Foot Bridge Reinforcement

通过拆桥新建与桥梁加固两个方案多方面对比分析,确定桥梁加固为本工程的最终方案;将增大截面加固法应用于实际桥梁工程加固中,建立空间有限元理论模型,分析桥梁各构件内力,结合本工程受力及破坏特点,选择受拉区截面正截面承载力计算公式,试算确定加固截面尺寸与配筋,兼顾受压区受力性能,提高拉压区截面承载力,同时保证截面不出现脆性破坏;为类似工程设计提供参考。

Through the comparison and analysis of the two plans of constructing new bridge and bridge reinforcement, the final plan for bridge reinforcement is determined. The enlarging-area reinforcement method is applied to the actual bridge reinforcement, and the spatial finite element theory model is set up to analyze the internal forces of the bridge components. Combined with the stress and failure characteristics of the project, the calculation formula of the bearing capacity of the cross section of the drawing area is selected, and the size of the reinforcement section and the reinforcing amount are determined by the calculation. Taking into account the mechanical properties of the compression zone,the bearing capacity of the section in the tension and compression zone is increased, while the section does not exhibit brittle failure, to provide reference for similar engineering design.