工艺与制造英文2025
大跨度FRP-金属组合桁架应急桥梁悬臂推进过程有限元计算方法
Finite element calculation method for the cantilever push process of large span FRP‐metal composite truss emergency bridges
Jiahui Bei, Haojing Wang, Jianguo Li, Meng Wang, Qilin Zhao · College of Mechanical and Power Engineering Nanjing University of Technology Nanjing Jiangsu 211816 China
摘要整理
针对传统有限元计算方法无法准确反映大跨度FRP-金属组合桁架应急桥梁悬臂推进过程中变形和内力状态的问题，本文首先介绍了大跨度FRP-金属组合桁架应急桥梁的结构形式、导梁结构及悬臂推进施工工艺，建立了传统有限元模型和改进有限元模型，对两种模型在悬臂推进过程中的计算结果进行了对比分析。研究发现，两种有限元模型在支座反力工况下的计算结果存在较大差异。通过缩尺模型试验验证，改进的有限元模型能够更准确地模拟实桥推进过程中的变形和内力状态。研究表明，改进的有限元模型考虑了推进过程中的实际约束条件和接触关系，能够更真实地反映结构的力学行为。建议在后续详细设计中采用改进的有限元模型来模拟大跨度FRP-金属组合桁架应急桥梁的悬臂推进施工过程，以提高设计的准确性和安全性。
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