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

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.