研究目的:高墩桥梁稳定性一直是影响桥梁结构安全的关键因素，如何在保证桥梁外形美观、结构受力 合理的情况下提高高墩桥梁的稳定性，是工程技术人员一直在探讨的问题。本文以京承三期清水河2#桥为 工程背景，采用三维有限元分析软件SAP2000对双肢薄壁高墩刚构桥进行空间稳定性分析，并对比分析在有 无横系梁的情况下最大悬臂施工阶段和成桥阶段桥梁的稳定性。
研究结论:初步得出了墩间横系梁对双肢薄壁高墩桥梁稳定性的影响:墩间横系梁主要对顺桥向的桥梁 稳定性贡献较大，对桥梁横向稳定性基本上没有影响;随着墩间横系梁数量的增加，对稳定性的贡献也趋于稳 定。恰当地设置横系梁能有效地提高双肢薄壁高墩刚构桥梁的稳定性，但随着横系梁数量的增加稳定性提高 并不明显。
Research purposes: The stability of the high-rise pier is always a critical factor for the safe of bridge. How to increase the stability of the high-rise pier, and at the same time make the appearance aesthetic and the force reasonable，is always a question for the engineers explored. The paper analyses the spacial stability for the double-shaft and thin-wall high-rise pier bridge of the Jing-Cheng-San-Qi Qingshuihe 2#, with the three-dimensional finite element analysis software SAP2000，comparisons for the stability of the non-collar beam between the double-shaft of the high-rise pier and the added-collar beams for the longest cantilever construction and the final completion are analyzed.
Research conclusions: The influence of the stability by the collar beam for the double-shaft and thin-wall high-rise pier is preliminarily given; the collar-beam is making a larger contribution to the straight forward stability for the bridge, and has little effect for the lateral stability; increasing the collar-beam between the thin-wall piers , the contribution for the stability comes to the stabilization. The collar-beam between the thin-wall piers is effectively increasing the stability for the double-shaft and thin-wall high-rise pier bridge, but after a certain extent, increasing the numbers of the collar-beam is not apparent.
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