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大跨钢桁拱桥采用悬臂法施工,中跨大悬臂施工过程中,结构倾覆力矩大,为确保结构稳定安全,需按规范要求进行压重设计。该文依托珠海横琴二桥主桥施工工程,对抗倾覆性压重控制技术包括抗倾覆系数计算原理、压重实施方法进行详细阐述分析,建立全桥施工有限元模型,综合考虑风荷载作用以及边跨杆件受力情况对关键施工工况进行倾覆计算分析,确定最优压重方案。
Large-span steel truss arch bridge by cantilever construction, mid-span large cantilever construction process, the structure of overturning moment, in order to ensure the stability and safety of the structure, according to specifications required weight design. This article relies on Zhuhai Hengqin Bridge construction of the main bridge, against capsize weight control technology, including anti-overturning coefficient calculation principle, detailed implementation of the method of stress analysis, the establishment of full-bridge construction finite element model, considering the role of wind load and The calculation of the key construction conditions overturning across the force of the bars shall be carried out to determine the optimal weighting plan.