连续梁桥悬臂施工整体倾覆稳定安全系数研究

Study of overturning stability safety factors of continuous girder bridges during cantilever construction

提出了一种基于可靠度反分析理论的连续梁桥悬臂施工整体倾覆稳定安全系数研究方法.该方法在已知给定的目标可靠指标的前提下,通过可靠度反分析理论,在计入结构参数随机性的前提下,求解连续梁桥悬臂施工整体倾覆稳定安全系数.运用该方法对一座连续梁桥的倾覆稳定安全系数进行计算,并进行参数分析.倾覆稳定安全系数计算结果表明,参数的随机性会对连续梁桥悬臂施工整体倾覆稳定安全系数产生较大影响,忽略参数随机性的影响会导致过高地估计连续梁桥悬臂施工整体倾覆稳定安全系数.

This paper presents a study method for overturning stability safety factors of continuous girder bridges during cantilever construction based on inverse reliability theory. This method which both consid- ered influence of uncertainty factors among structure parameters and satisfied prescribed reliability level was used to get inverse safety factors through target reliability indices. Overturning stability factors of continuous girder bridges during cantilever construction are estimated using the proposed method. The re- sults show that the parameters uncertainty has a major effect on overturning stability safety factors of con- tinuous girder bridges during cantilever construction. Ignoring parameters uncertainty will produce overes- timation of overturning stability safety factors of continuous girder bridges during cantilever construction.