已下挠连续梁桥加固方案研究  

Study on Reinforcement of Deflected Continuous Beam Bridge

作　　者：石雪飞[1] 陈辉[1] 沈炯伟[1] 

机构地区：[1]同济大学桥梁工程系,上海200092

出　　处：《石家庄铁道学院学报（自然科学版）》2010年第1期1-5,共5页Journal of Shijiazhuang Railway Institute

基　　金：广东省交通科技项目(2007-17)

摘　　要：针对目前一些大跨径预应力混凝土连续梁桥跨中长期挠度过大的问题,以汾江大桥为工程背景,分析导致该桥主梁挠度过大的主要原因。通过实测资料进行计算分析,说明体外预应力加固未能阻止主梁进一步下挠的原因。提出一种以钢箱梁替代跨中梁段的加固方案,通过计算分析其加固效果并与体外预应力加固进行对比,简单分析其可行性并展望应用前景。At present,the long-term deflection of some long span prestressed concrete continuous beam bridge is getting more and more serious.Aiming at this problem,taking Fenjiang Bridge as the engineering background,the reasons that lead to the deflection of the bridge are analyzed.Through calculations and analyses based on the measured data,it is explained why external prestressing did not stop the deflection of the bridge.A reinforcement method is proposed using steel box girder to take the place of the concrete box girder in the mid-span,and the effect of this method is analyzed through calculating results.The feasibility of this method is discussed and its prospect is forecasted.

关 键 词：连续梁桥 长期挠度 加固 体外预应力 截断 

分 类 号：U445.7[建筑科学—桥梁与隧道工程]