杨雅斌, 石广玉. 正交异性钢桥面板肋-面板焊缝疲劳验算的应力分析模型评估[J]. 工程力学, 2019, 36(S1): 98-105. DOI: 10.6052/j.issn.1000-4750.2018.04.S018
引用本文: 杨雅斌, 石广玉. 正交异性钢桥面板肋-面板焊缝疲劳验算的应力分析模型评估[J]. 工程力学, 2019, 36(S1): 98-105. DOI: 10.6052/j.issn.1000-4750.2018.04.S018
YANG Ya-bin, SHI Guang-yu. EVALUATION OF FINITE ELEMENT ANALYSIS MODELS FOR FATIGUE STRESS AT RIB-TO-DECK WELDED JOINTS OF ORTHOTROPIC STEEL DECK[J]. Engineering Mechanics, 2019, 36(S1): 98-105. DOI: 10.6052/j.issn.1000-4750.2018.04.S018
Citation: YANG Ya-bin, SHI Guang-yu. EVALUATION OF FINITE ELEMENT ANALYSIS MODELS FOR FATIGUE STRESS AT RIB-TO-DECK WELDED JOINTS OF ORTHOTROPIC STEEL DECK[J]. Engineering Mechanics, 2019, 36(S1): 98-105. DOI: 10.6052/j.issn.1000-4750.2018.04.S018

正交异性钢桥面板肋-面板焊缝疲劳验算的应力分析模型评估

EVALUATION OF FINITE ELEMENT ANALYSIS MODELS FOR FATIGUE STRESS AT RIB-TO-DECK WELDED JOINTS OF ORTHOTROPIC STEEL DECK

  • 摘要: 以天津塘沽海河大桥的正交异性钢桥面板为例,建立钢箱梁节段的有限元分析(FEA)模型、简化FEA模型和基于钢箱梁节段的子模型进行肋-面板焊缝疲劳应力分析模型的评估。计算结果表明:对于远离纵腹板处的肋-面板焊缝,通过提高简化FEA模型中横隔板高度和约束横隔板底部翼缘的方式可减小与钢箱梁节段FEA模型结果的误差;对于靠近纵腹板处的肋-面板焊缝,所有简化FEA模型的应力计算结果均低于钢箱梁节段FEA模型的结果,且误差超过23%。基于钢箱梁节段的三跨子模型可以准确地给出钢桥面板任意位置的肋-面板焊缝的疲劳应力。它具有钢箱梁节段FEA模型的计算精度和简化FEA模型的计算效率,因此它可作为正交异性钢桥面板任意位置处肋-面板焊缝疲劳应力分析的准确和高效计算模型。

     

    Abstract: Based on the orthotropic steel deck of Haihe Bridge in Tanggu, Tianjin, three finite element analysis (FEA) models for the fatigue stress analysis of rib-to-deck welded joints are evaluated, where the three FEA models are a FEA model of a standard steel box girder segment, a simplified FEA model, and a submodel of a steel box girder. The results show that the deviation between the simplified FEA model results and the FEA model results of a standard steel box girder segment can be reduced by increasing the diaphragm depth and constraining the flanges at the bottom edges of the diaphragm when analyzing the fatigue stress of rib-to-deck joints far away from a longitudinal web. All the simplified FEA models are not applicable to the stress analysis of the rib-to-deck joints near a longitudinal web since the stresses given by all simplified FEA models are at least 23% lower than that given by a standard steel box girder segment model. The 3-span submodel based on a steel box girder can give accurate results for the fatigue stress of rib-to-deck joints at any position of an orthotropic steel deck. Therefore, the 3-span submodel proposed is an efficient and accurate FEA model for the fatigue stress analysis of rib-to-deck welded joints at any position of a orthotropic steel deck, because it has the computational accuracy of the FEA model of a standard steel box girder segment and the computational efficiency of the simplified FEA model.

     

/

返回文章
返回