钢筋混凝土双曲拱桥的病害机理分析及加固策略研究

钢筋混凝土双曲拱桥首创于1964年,由于当初设计时荷载标准较低,再加上多年超载运营,桥梁产生了许多病害,导致承载能力下降,对交通运输安全构成严重威胁.以一实际公路双曲拱桥为工程背景,从设计和计算角度研究了其病害产生的原因,采用数值模拟方法分析了横向联系对桥梁整体刚度、强度及荷载横向分布系数的影响,并提出增设新横系梁的方法提高桥梁整体刚度.通过加固前后理论分析结果的对比,说明本文提出的加固方法对于双曲拱桥的加固具有良好的效果.

Damage Mechanism and Reinforcement Strategy of Reinforced Concrete Double-curved Arch Bridges

Reinforced concrete double-curved arch bridges originated from 1964.The bridges have lots of damages because of imprecise build criterion at that time and perennial excess load for many years,so that the loading capacity of them is reduced,which threatens driving safety greatly.In this paper,the reasons of damages are studied from the point of view of design and calculation,and the influences of lateral connection for an existing reinforced concrete double-curved bridge entire rigidity and strength and transverse distribution are analyzed by using numerical simulation,and then adding straining beam method for increasing bridge entire rigidity is presented.After the comparison of the theoretical results between before and after the reinforcement,the reinforcement method of the double-curved arch bridge has a good effect.