大挑臂钢板组合箱梁矮塔斜拉桥主梁有限元分析

Finite Element Analysis on Main Girder of Large-cantilever Steel Plate Composite Box Girder Low-pylon Cable-stayed Bridge

摘要:

以一座大挑臂钢板组合箱梁矮塔斜拉桥作为背景，利用ANSYS软件建立了“梁-实体单元”混合有限元模型，分析该桥在正常使用极限状态和承载能力极限状态下混凝土桥面板、斜撑和钢箱梁的力学特性。结果表明：在正常使用极限状态下，桥面板局部存在应力集中现象，但仍保持其受压弹性；在承载能力极限状态下，钢箱梁处于弹性状态；各部件均满足相应的受力需求。建模分析与计算过程可为日后类似工程提供参考依据。

Abstract:

Taking a large cantilever steel plate composite box girder low-pylon cable-stayed bridge as the background, the "girder-solid unit" combined finite element model is established by the software Ansys to analyze the mechanical properties of the concrete bridge deck, diagonal brace and steel box girder of the bridge under the normal service limit state and the bearing capacity limit state. The results show that under the normal service limit state, there is the stress concentration in the part of bridge deck, but it still maintains its compressive elasticity. Under the bearing capacity limit state, the steel box girder is in an elastic state. All components meet the corresponding force requirements. This modeling analysis and calculation process can provide the reference and basis for similar projects in the future.