混凝土收缩徐变对大跨度桥梁跨中下挠的影响研究——以荆州海子湖大桥为例

Research on the Influence of Concrete Shrinkage and Creep on the Mid-span Deflection of Large-span Bridges—Taking Jingzhou Haizihu Bridge as an Example

大跨度桥梁跨中下挠严重的问题影响着桥梁的正常使用,而混凝土收缩徐变、预应力损失、现场施工和桥梁设计不合理等是造成桥梁跨中下挠过大的主要原因。文章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度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,使得桥梁跨中下挠问题更加严重。

The problem of serious mid-span deflection of large-span bridges affects the normal use of bridges,and concrete shrinkage and creep,prestress loss,on-site construction and unreasonable bridge design are the main causes for excessive mid-span deflection of bridges.Taking Jingzhou Haizihu Bridge as the engineering background,this paper studies the influence of concrete shrinkage and creep on the mid-span deflection of large-span bridges.The research shows that the shrinkage and creep of concrete will cause prestress loss,which will cause the deflection of the bridge,and the deflection of the bridge will cause the loss of prestress again,which makes the deflection of the bridges more serious.