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| 板桁梁轴弯剪几何特性的通用计算方法 |
| A general calculation method for axial-bending-shear geometrical property of plate truss girder |
| 投稿时间：2024-03-21 修订日期：2024-05-03 |
| DOI： |
| 中文关键词: 板桁梁 等效薄壁截面 轴弯剪几何特性 薄壁单元法 能量原理 加劲肋 |
| 英文关键词:Plate Truss Girder Equivalent Thin-walled Section Axial-bending-shear Geometrical Property Thin-walled Element Method Energy Principle Stiffener |
| 基金项目:国家自然科学基金项目（青年项目，面上项目） |
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| 中文摘要: |
| 为实现采用单梁模型对板桁梁桥的高效计算，研究板桁梁的几何特性（面积，惯性矩，剪切系数）的通用计算方法十分必要。首先，基于剪切刚度等效推导桁架连续化的等效厚度计算公式，并联合桁架的轴向受力等效厚度，实现等效薄壁截面对板桁梁的连续化模拟。随后，采用通用薄壁单元法建立板桁结合梁截面几何特性的计算方法，并编制计算程序。最后，以桁架与板桁梁为例，通过精细化有限元模型对本文方法进行验证。结果表明，本文方法提供的截面几何特性与梁单元结合建立的单梁模型可以应用于板桁梁的计算分析，且与精细模型结果能够较好地吻合；得到的变形结果也明确了剪切变形对板桁梁结构受力的影响不容忽视。 |
| 英文摘要: |
| In order to conduct a highly efficient calculation analysis for plate truss girders using single beam model, it is necessary to establish a general method for their section properties. Firstly, the formulas for the equivalent steel plate thickness of truss are derived based on the equivalent principle of shear rigidity. Also, the equivalent steel plate thickness for the axial behavior of truss is introduced. Thus, the plate truss girder can be modelled in a continuation pattern via an equivalent thin-walled section. Then, the calculation method for geometry properties of plate truss girders is presented through a thin-walled element method. To validate the proposed method, a spatial truss and a plate truss girder are investigated through comparison among analytical solutions, single beam models and refined finite element models. The investigations demonstrate that a single beam model established by combining the present method with beam finite element analysis can effectively analyze plate truss girders under bending and shear. The results obtained from the beam models are consistent with those obtained from the refined finite element models. Furthermore, the calculated deformation results indicate that the influences of the shear deformation on mechanical behavior of plate truss girders cannot be ignored. |
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