中文摘要：

研究目的：高墩大跨度连续刚构桥悬浇施工中，保证最大悬臂状态下结构的稳定性至关重要。本文以山西省某高墩大跨连续刚构桥（90＋168＋90）m为工程背景，以其2号墩T构最大悬臂状态为分析对象，考虑挂篮正常工作及单侧挂篮跌落两类情况，对高墩线性和非线性稳定进行系统性研究。通过引入“稳定安全储备系数”的概念，对两类稳定问题及是否考虑箍筋约束作用对墩柱非线性稳定性能的影响问题进行对比分析。研究结论：（1）在主梁所承受的恒载中，对刚构桥线性稳定性起控制作用的是结构自重；（2）风荷载不影响结构线性稳定，但对结构非线性稳定有明显影响；（3）对于高墩的稳定性，仍可采用线性稳定的分析方法和评判标准；（4）当考虑墩柱截面箍筋的约束作用时仍可采用稳定系数大于4—5的限值标准，当不考虑墩柱截面箍筋的约束作用时可适当提高稳定系数限值；（5）该研究结果可为高墩大跨连续刚构桥的设计和施工提供参考。

英文摘要：

Research purposes： The stability in the state of the maximum cantilever is crucial to long - span continuous rigid frame bridge with high pier constructed by segmental cantilever casting method. In this paper, the long - span continuous rigid frame bridge （90m ＋ 168m ＋ 90m） with high pier in Shanxi provincewas taken as an engineering background, and the maximum cantilever of pier No. 2 was selected as a research objective to conduct comprehensive study on linear and nonlinear stability of the bridgeunder two conditions of normal operation and unilateral drop of cradle. On the basis, the two kinds stability problems and the nonlinear stability of thehigh pier with or without considering hoop reinforcement effect were made by introducing the conception of stability safety storage coefficient. Research conclusions： （ 1 ） The weight of the bridge plays a key role in controlling linear stability. （2） Wind load does not affect linear stability of the bridge, but has obvious effects on nonlinear stability of the bridge. （3） Analysis method and evaluation standard of linear stability is suitable for the long - span continuous rigid frame bridge with high pier. （4） As for columns considering confinement effect of ordinary hoops, limit value of stabilization coefficient of 4 - 5 is still suitable. However, for columns without considering confinement effect of ordinary hoops, limit value of stabilization coefficient should be increased properly. （5）The results may be referenced in structural design and construction of long- span continuous rigid frame bridge with high pier.