中文摘要：

为了分析混凝土徐变效应对其空间受力行为的影响,研究过程中首先结合预应力混凝土组合单元,推导了复杂应力状态下混凝土徐变等效节点荷载的递推计算公式,开发了徐变计算的有限元程序。以典型PC连续梁桥为例,进一步研究了混凝土徐变对结构影响规律,发现不同规范徐变计算模式的差别、主梁挠度变化特征和机理、运营期内顶、底板正应力和腹板主应力的重分布特点,并对预应力束合理布置提出了建议。

英文摘要：

To evaluate the influence of concrete creep effect on spatial stress in concrete, the formulas for reeursive calculation of equivalent nodal load of creep of PC composite unit under complex stress were derived, and a FE program for calculation of concrete ereep was developed. Then, taking a typical PC continuous beam bridge for example, the regular pattern of the influence of concrete creep on the structure was analysed, the difference of creep calculation modes in different specifications was found, the changing feature and mechanism of girder deflection was found as well. The characteristics of redistribution of normal stresses in top, bottom of slabs and principle stress in web in the service stage were given, and the reasonable arrangement of prestressed tendons was advised.