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选取合适的混凝土收缩徐变模式是保证大跨径混凝土刚构桥分析准确的前提条件。本文采用三种不同的收缩徐变模式,对苏通大桥连续刚构梁体的应力状态、跨中挠度和预拱度等进行分析,并结合施工监控的实测数据进行了对比分析。研究表明,CEB-FIP 78收缩徐变模式更能反映该桥施工阶段的实际情况。
Choosing the appropriate concrete shrinkage and creep mode is the precondition to ensure the accurate analysis of the long-span concrete rigid frame bridge. In this paper, three different modes of shrinkage and creep are adopted to analyze the stress state, mid-span deflection and pre-camber of continuous rigid-frame beam of Sutong Bridge. The contrastive analysis is made with the measured data of construction monitoring. The study shows that the mode of shrinkage and creep of CEB-FIP 78 can better reflect the actual situation of the bridge construction stage.