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| 上跨既有高速公路钢箱梁临时支架设计及优化研究 |
| Design and Optimization of Temporary Supports for Steel Box Girders over Existing Expressways |
| 投稿时间：2026-04-27 |
| DOI：10.16018/j.cnki.cn32-1650/n.202602010 |
| 中文关键词: 钢箱梁 临时支架 有限元模型 截面优化 格构柱布置 稳定性 |
| 英文关键词: steel box girder temporary support finite element model section optimization lattice column arrangement stability |
| 基金项目:安徽交控工程集团有限公司科技研发项目(2024-RD01) |
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| 中文摘要: |
| 在钢箱梁上跨既有通车路段施工过程中,临时支架设计方案直接影响施工安全及道路通行保障。本文以G0321德州至上饶高速公路祁门至皖赣界段金字牌枢纽跨黄浮高速分离立交主线桥第二联50 m简支钢箱梁为研究对象,对钢箱梁架设跨高速临时支架,借助Midas Civil软件建立支架1:1的空间有限元模型,对施工周期内支架应力分布、竖向变形及整体稳定性进行系统核算,并重点分析了两类关键变量对受力状态的影响。结果表明,支架体系力学响应主要受整体刚度分布与稳定裕度影响,而非构件自身的强度储备;原设计"水平联系杆+斜撑"的分层布置更契合跨路临时支架传力规律,其强度、刚度及整体稳定性均满足现行公路桥涵规范要求;外侧与中分带立柱截面同步增大可显著优化整体受力性能,但综合材料用量提升。 |
| 英文摘要: |
| During the construction of steel box girders over existing expressways under traffic, the design of temporary supports directly affects construction safety and traffic operation. This paper takes the second unit 50 m simply supported steel box girder of the mainline bridge of the Jinzipai Hub grade-separation over the Huangfu Expressway, G0321 Dezhou-Shangrao Expressway Qi—men-Anhui-Jiangxi Border Section, as the research object. For the temporary supports used during the erection of the steel box girder crossing the expressway, a 1:1 spatial finite element model of the support system was established using Midas Civil software. The stress distribution, vertical deformation , and overall stability of the supports during the construction period were systematically checked, and the effects of two key variables on the mechanical behavior were analyzed. The finite element analysis results show that the mechanical response of the support system is mainly governed by the distribution of overall stiffness and stability margin, rather than by the strength reserve of individual members. The original layered arrangement of "horizontal bracing + diagonal brace" is more consistent with the force transmission mechanism of cross-road temporary supports, and its strength, stiffness, and overall stability all meet the requirements of current highway bridge and culvert specifications. Simultaneously increasing the cross-sections of the outer columns and central median columns can significantly improve the overall mechanical performance. However, improving mechanical performance comes at the cost of increased material consumption. |
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