某高速公路独柱墩连续箱梁桥抗倾覆稳定分析与加固设计

Anti-overturning Stability Analysis and Reinforcing Design of Single Column Pier Continuous Box Girder Bridges on a Freeway

在汽车超载或偏载作用下,独柱墩连续箱梁桥可能存在横向倾覆失稳的隐患,如何保证已建独柱墩梁桥抗倾覆稳定能力,需要进行抗倾覆稳定分析与加固设计。分析独柱墩梁桥横向倾覆的过程,总结失稳机理;针对现行规范中抗倾覆理论的不足,按照4种验算依据,对位于某高速公路的2座独柱墩四跨连续箱梁桥进行抗倾覆稳定分析,并提出抗倾覆加固设计。加固验算和抗倾覆加固工程工后检测结论表明,采用的验算依据和提出的加固设计方案是有效可行的。

Owing to the hidden risk of lateral overturning instability of a single column pier continuous box girder bridge subjected to vehicle overloading or unbalance loading,then how to ensure the anti-overturning capacity of those built bridges,anti-overturning stability analysis and reinforcing design is needed. In this paper,the process of lateral overturning of single column pier girder bridge was analyzed,the mechanism of instability was summarized,and 4 basis of checking calculation to the deficiency of anti-overturning theory in the current codes were used to analyze the overturning stability of two single column pier four-span continuous box girder bridges located in Zhan-Xu freeway,and the feasible reinforcing design scheme was put forward,. Finally,these checking calculation basis and reinforcing design scheme has confirmed to be effective and feasible by the checking result and the test conclusion after anti-overturning reinforcement working.