独柱墩曲线钢箱梁桥抗倾覆稳定性分析

Analysis of anti-overturning stability of curved steel box girder bridge with single column pier

以某两跨独柱墩曲线钢箱梁桥为研究背景,对曲线桥梁结构的抗倾覆稳定性开展研究。首先,依据设计资料建立该两跨独柱墩曲线钢箱梁桥的空间有限元模型,分别考虑活载系数为1.0,1.5以及2.5时的抗倾覆稳定系数及各支座支反力;进一步探讨了支座布置形式、支座间距对该类型桥梁结构抗倾覆稳定性的影响规律,并采用支座反力与抗倾覆稳定系数对桥梁结构的抗倾覆性能进行分析。研究结果表明,随着车辆荷载的增加,桥梁的抗倾覆能力逐渐下降;此外,支座布置形式及支座间距对独柱墩曲线钢箱梁桥的抗倾覆稳定性具有重要影响,采用双支座体系的曲线梁桥梁具有较好的抗倾覆稳定性,且在合理范围内增大支座间距可有效提高桥梁结构的抗倾覆安全性能。

Taking a two span curved steel box girder bridge with single column piers as the research background,the anti-overturning stability of curved bridge structure is studied.Firstly,the spatial finite element model of the two span curved steel box girder bridge with single column piers is established according to the design data,and the anti-overturning stability coefficient and the reaction force of each support when the live load coefficient is 1.0,1.5 and 2.5 are considered respectively.Further exploration was conducted on the influence of support arrangement and spacing on the anti-overturning stability of this type of bridge structure,and the anti-overturning performance of the bridge structure was analyzed using support reaction force and anti-overturning stability coefficient.The research results indicate that as the vehicle load increases,the anti-overturning ability of the bridge gradually decreases.In addition,bearing layout and bearing spacing have an important impact on the anti-overturning stability of curved steel box girder bridges with single column piers.Curved girder bridges with double bearing systems have better anti overturning stability,and increasing the bearing spacing within a reasonable range can effectively improve the anti-overturning safety performance of bridge structures.