A sufficient understanding of mechanical performance of self-anchored suspension bridge with double-sided steel box girder is essential for design and normal use as such bridges are widely built in urban bridge. Using the Yunlongwan Bridge which is a suspension bridge with ultra-wide double-sided steel box girder as an example, this paper investigates its deformation and mechanical performance under vehicle load. Firstly, based on the field test results, the deformation performance of the bridge and the stress distribution of the main girder are analysed, with emphasis on the shear lag effect of double-sided steel box girder. Then, a multiscale model of the bridge was built, and the accuracy of the model was verified by comparison with the test data. Finally, the influence of design parameters on the mechanical behaviour of double-sided steel box girder is studied by numerical simulation. The results show that the deformation of the bridge has good symmetry, there is obvious shear lag effect on the main girder, and the U-rib thickness, diaphragm spacing, and vehicle load could significantly affect the stress of the main girder top plate. The obtained analytical results lead to a better understanding of the mechanical performance and provide reference for the design of self-anchored suspension bridge with double-sided steel box girder.

中文翻译：

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超宽双侧钢箱梁自锚式悬索桥力学性能分析及参数研究

充分了解双侧钢箱梁自锚式悬索桥的力学性能对于城市桥梁中广泛建造的桥梁设计和正常使用至关重要。以超宽双面钢箱梁悬索桥云龙湾大桥为例，研究其在车辆荷载作用下的变形和力学性能。首先，根据现场试验结果，分析了桥梁的变形性能和主梁的应力分布，重点分析了双面钢箱梁的剪力滞效应。然后，建立了桥梁的多尺度模型，并通过与试验数据的对比验证了模型的准确性。最后，通过数值模拟研究了设计参数对双面钢箱梁力学行为的影响。结果表明，桥梁变形具有较好的对称性，对主梁有明显的剪力滞效应，U肋厚度、隔板间距、车辆荷载对主梁顶板应力有显着影响。所得分析结果有助于更好地了解其受力性能，为双侧钢箱梁自锚式悬索桥的设计提供参考。和车辆载荷会显着影响主梁顶板的应力。所得分析结果有助于更好地了解其受力性能，为双侧钢箱梁自锚式悬索桥的设计提供参考。和车辆载荷会显着影响主梁顶板的应力。所得分析结果有助于更好地了解其受力性能，为双侧钢箱梁自锚式悬索桥的设计提供参考。