外倾式拱桥拱肋安装支架设计与应用

Design and Application of Outward-inclined Arch Rib Erection Supports for Arch Bridges

摘要:

针对桥梁施工支架作为临时承载结构的关键作用，为确保外倾式拱肋施工过程的安全性与结构稳定性，开展支架优化设计研究，避免因设计缺陷引发坍塌事故，减少人员伤亡及经济损失。以奚家港大桥外倾式拱肋施工支架为研究对象，提出两种不同的支架设计方案，建立三维有限元模型，通过数值模拟对支架体系进行强度分析、刚度分析及稳定性分析，对比两种方案的力学性能差异。研究结果表明，两种不同的支架设计方案均能满足施工要求，但各有优劣，为类似桥梁工程的支架设计提供了重要的参考依据。研究成果可为同类桥梁施工提供理论依据与设计参考，有效降低工程风险。

Abstract:

Regarding the crucial role of bridge construction supports as temporary load-bearing structures, to ensure the safety and structural stability during the construction of outward-inclined arch ribs, the optimization design and research on the supports are conducted to prevent the collapse accidents caused by design defects, thereby reducing the casualties and economic losses. Taking the construction support for outward-inclined arch ribs of Xijiagang Bridge as the research object, two different support design schemes are proposed. The three-dimensional finite element model is established to perform the numerical simulations for strength analysis, stiffness analysis, and stability analysis of the support system. The mechanical performance differences of the two schemes are compared. The results demonstrate that both different design schemes of supports can meet the construction requirements, but each has its own advantages and disadvantages, which provides the valuable references for support design of the similar bridge projects. The research outcomes offer the theoretical basis and design guidance for the construction of the similar bridges, and the engineering risks can be effectively reduced.