长沙市八一路跨线桥加固改造设计

Reinforcement and Retrofitting Design of Viaducts of Bayi Road in Changsha

长沙市八一路跨线桥由于近年来交通流量大增,实际行车荷载等级提高,使得该桥处于超负荷的营运状态,为了保证大桥营运安全,需要对此桥的主体结构进行加固,在选择加固方案时对比了三种加固方法:钢-混凝土组合结构加固方法、混凝土结构扩大截面加固方法、粘钢加固方法。经分析比较采用钢-混凝土组合截面加固设计方案。实践证明此方案技术可行、结构可靠、经济合理,具有明显的社会经济效益。可以为以后此类结构的加固提供参考。

Because traffic flow greatly increases in recent years and the rank of actual driving load enhances, causing this bridge to be at the excess load the service condition, so in order to guarantee the bridge＇ s transport security, the main body structure of the bridge should be reinforced. There are three methods of reinforcement as follow： Steel-concrete built-up structural reinforcement; concrete-structure sectionexpansion reinforcement; sticking the steel. By analyzing and comparing these methods, the second method, which is feasible in technology, reliable in structure, reasonable in economy, and can obtain obvious social economic benefit, is adopted. Moreover, it can also provide a reference for reinforcement.