摘要
针对宜城汉江大桥主梁出现的较严重裂缝及下挠,根据所做的荷载试验结论以及原桥设计状况的复核计算,对主梁病害成因进行了分析,并在此基础上对主梁的损伤进行了反复的模拟与试算。提出包络设计的思路,建立包含上、下限的的加固控制模型;采用分级张拉体外索的方法对主梁进行加固处理,并对主梁刚度偏低部位增设钢桁架进行刚度补强。
After twenty years of operation,the Yicheng Han River bridge has occurred many serious problems which has greatly influenced the structural system of the bridge which in return made it cannot run in a good condition.Based on the load test conclusion and the status of the original bridge design calculations,the reasons of the diseases were deeply analyzed.According to it＇s results,this article propose the idea of envelope design,thus setting up a reinforcement model.Finally the reinforcement measures are proposed to make sure the safety operation of bridge.
出处
《交通科技》
2012年第2期64-66,74,共4页
Transportation Science & Technology
关键词
连续梁
包络设计
体外预应力
加固
损伤模拟
continuous girder
envelope design
external prestress
strengthening of structure
damage simulation
