全时程时效分析理论及其在大跨桥梁中的应用

Theory of time based effect analysis and application in large span bridges

以截面平衡方程和结构平衡方程为基础，通过综合考虑混凝土的收缩、徐变及预应力钢束的松驰等时效因素对预应力混凝土结构的影响，提出了一种计算时效影响的理论方法。利用该方法对哈—绥公路上某三跨预应力混凝土连续刚构桥进行了施工阶段的高程控制，并对该桥的长期使用性能进行了预测计算及分析，得到了良好的效果。

On the basis of equation of cross section and equilibrium equation of the whole structure, a time dependent analytical theory is put forward by taking synthetically the shrinkage and creep of concrete and relaxation of tendon in prestressed concrete structure into account. The method is used to control construction elevation and forecast the long term performance of a 3 spans continuous rigid frame bridge of prestressed concrete, and the better results are gained.