独柱墩桥梁抗倾覆验算及加固设计

Anti-overturning Checking Calculation and Reinforcement Design of Single-column Pier Bridge

文中采用桥梁通用有限元分析软件Midas Civil 2021及midas Civil Designer,对水碾坝枢纽互通B匝道桥的独柱墩桥梁进行抗倾覆验算,针对验算结果提出三种加固方案,并通过对比分析选出最优方案。验算结果显示,特征状态1下,虽有一个支座出现脱空,但桥梁结构体系仍然稳定,不会发生倾覆;特征状态2下,桥梁抗倾覆稳定性系数为4.54,满足规范要求。为确保桥梁更高的安全性,文中提出增设拉杆和盖梁支座的加固方案,经实施后,桥梁的抗倾覆系数提高至6.1。水碾坝枢纽互通B匝道桥的独柱墩桥梁在设计和运营上均满足现行规范要求,但为提高其抗倾覆能力和确保行车安全,推荐并实施综合性的加固设计方案。

The bridge general finite element analysis software Midas Civil 2021 and midas Civil Designer is used to check the overturning of the single pier bridge of the B ramp bridge of the roller dam hub.Three reinforcement schemes are proposed according to the test calculation re-sults,and the optimal scheme is selected through comparative analysis.The calculation results show that in the characteristic state 1,although a support is empty,the bridge structure system is still stable and will not overturn.In the characteristic state 2,the stability coefficient of the bridge against overturning is 4.54,which meets the specification requirements.In order to ensure the higher safety of the bridge,the reinforce-ment scheme including the addition of pull rod and cover beam support is proposed.After the implementation,the anti-overturning coefficient of the bridge is increased to 6.1.The single column pier bridge of the B ramp bridge of the water roller dam hub meets the requirements of the current specifications,but in order to improve its anti-overturning ability and ensure driving safety,a comprehensive reinforcement design scheme is recommended and implemented.