某连续刚构桥梁体外预应力加固性能分析

Performance Analysis of External Prestressing Reinforcement for a Continuous Rigid Frame Bridge

随着大跨度连续刚构桥梁的大量建设,受环境变化、材料性能、现有施工技术水平等限制,在营运过程中箱梁梁体出现了裂缝、跨中下挠等病害,经济发展带来交通运输量的快速增长更是使得病害趋向于严重化态势发展,降低了连续刚构桥梁的承载能力和大幅度缩短了桥梁的使用寿命。以某连续刚构桥为例,简述了该桥的病害情况,分析了病害成因并依据计算提出了加固处治方案,可为类似桥梁加固提供参考和借鉴。

With the extensive construction of large-span continuous rigid frame bridges,due to environmental changes,material performance,existing construction technology levels,and other limitations,box girder beams have developed diseases such as cracks and mid span deflection during operation.The rapid growth of transportation volume brought about by economic development has led to a trend of serious disease development,reducing the bearing capacity of continuous rigid frame bridges and significantly shortening the service life of bridges.Taking a continuous rigid frame bridge as an example,this paper briefly describes the disease situation of the bridge,analyzes the causes of the disease,and proposes reinforcement treatment plans based on calculations,which can provide reference and reference for similar bridge reinforcement.