小半径钢箱梁温度梯度作用下抗倾覆影响分析

Analysis of Influence on Anti-overturning of Small-radius Steel Box Girders under Action of Temperature Gradient

摘要:

对温度梯度作用下小半径钢箱梁的抗倾覆效应进行参数影响分析，并提出了一种基于公路桥梁规范的抗倾覆计算公式修正方法。研究结果表明：温度梯度作用下，增大支座间距和曲线半径对提高钢箱梁的抗倾覆稳定性具有显著效果；同时发现现行规范中的抗倾覆计算方法未对汽车作用和非汽车作用的失稳效应进行区分，若直接采用将可能导致设计过度保守。

Abstract:

The parameter influence on the anti-overturning effect of small-radius steel box girder under the action of temperature gradient is analyzed, and a correction method for the anti-overturning calculation formula based on highway bridge codes is proposed. The study results indicate that under the action of temperature gradient, the increase of support spacing and curve radius has the significant effect for enhancing anti-overturning stability of steel box girders. Additionally, it is found that the instability effects of automotive action and non-automotive action are not distinguished in the anti-overturning calculation method in the current codes, which may lead to overly conservative design if adopted directly.