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钢-混凝土结合梁由钢梁、混凝土板和剪力连接件组合而成,这三者在结合梁受力过程中分别存在不同程度的剪切变形,导致钢梁和混凝土板界面之间的相对滑移效应。本文基于ANSYS有限元技术,对世界上首座3塔4跨地锚式悬索桥——武汉鹦鹉洲长江大桥建立三维空间有限元全桥模型,通过有限元模型拼接技术将标准节段的精细化模型嵌入鱼刺梁式的杆系模型中,研究最不利工况状态下标准节段中预制桥面板与钢主梁之间剪力键的滑移效应。计算结果表明:在设计的移动荷载下,鹦鹉洲大桥最大的单钉剪力值为20.6 kN,仅为其设计承载强度的34.3%,最大滑移量值为0.086 mm;在1.5倍设计移动荷载下,最大的单钉剪力值为27 kN,为其设计承载强度的44.9%,最大滑移量值为0.163 mm。鹦鹉洲大桥现有剪力连接栓钉工作性能良好,承载富余较大。
The steel-concrete composite beams are composed of steel beams, concrete slabs and shear connectors. All three have different degrees of shear deformation during the stress of the composite beams, resulting in the relative slip between the steel beams and the concrete slab interface. Based on the ANSYS finite element method, a three-dimensional finite element full-bridge model is established for the world’s first 3-tower 4-span suspension bridge-Wuhan Parrot Island Yangtze River Bridge. The refined model of the standard section is embedded by finite element model In the fishbone beam model, the sliding effect of the shear bond between the prefabricated bridge deck and the steel girder in the most unfavorable conditions is studied. The calculated results show that under the designed moving load, the maximum single-screw shear force at Parrot Island Bridge is 20.6 kN, which is only 34.3% of the design load strength and the maximum slip value is 0.086 mm. At 1.5 times the designed moving load , The maximum single-screw shear force is 27 kN, which is 44.9% of the designed load-bearing strength and the maximum slip is 0.163 mm. Existing Parrot Chau Bridge shear connection work well, carrying a larger surplus.