混凝土收缩徐变对大跨桥梁跨中下挠的影响研究  

Study on Effect of Concrete Shrinkage Creep on Mid-span Deflection of Large-span Bridges

作　　者：邹明 刘新辉 ZOU Ming;LIU Xinhui(The Fourth Engineering Company of China Railway Seventh Group Co.,Ltd.,Wuhan 430074,Hubei,China;School of Civil Engineering,Central South University,Changsha 410075,Hunan,China)

机构地区：[1]中铁七局集团第四工程有限公司,湖北武汉430074 [2]中南大学土木工程学院,湖南长沙410075

出　　处：《建筑施工》2023年第7期1472-1475,共4页Building Construction

摘　　要：为找到因混凝土收缩徐变、预应力损失、现场施工、桥梁设计是否合理等造成的大跨度桥梁跨中下挠问题,以荆州海子湖大桥为工程背景,研究混凝土收缩徐变对大跨桥梁跨中下挠的影响。研究表明,混凝土收缩徐变会使预应力损失造成桥梁下挠,桥梁下挠又会造成预应力再次损失,使得桥梁跨中下挠更加严重。In order to find the problem of mid-span deflection of large-span bridges due to concrete shrinkage creep,prestress loss,field construction,and whether the bridge design is reasonable or not,the effect of concrete shrinkage creep on mid-span deflection of large-span bridges is studied with Jingzhou Haizihu Bridge as the engineering background.The study shows that concrete shrinkage creep will cause the loss of prestress causing bridge deflection,and bridge deflection will cause the loss of prestress again,making the bridge mid-span deflection more serious.

关 键 词：大跨度桥梁 跨中下挠 混凝土收缩徐变 预应力损失 

分 类 号：TU526[建筑科学—建筑技术科学]