钢-混凝土结合梁悬索桥剪力钉滑移效应

发布时间：2018-10-18 08:53

【摘要】：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。
[Abstract]:The steel-concrete composite beams are composed of steel beams, concrete slabs and shear connectors. These three beams have different shear deformation in the process of loading, which leads to the relative slip effect between the steel beam and the concrete slab interface. Based on ANSYS finite element technique, this paper presents a 3D finite element full-bridge model for the world's first 3-tower 4-span ground anchor suspension bridge, Wuhan Parakuzhou Yangtze River Bridge. The fine model of standard segment is embedded into the rod system model of fish-prickly beam by finite element model splicing technique. The slip effect of shear bond between precast deck slab and steel main beam in standard section under the most unfavorable working condition is studied. The calculation results show that under the designed moving load, the maximum shear value of the single nail is 20. 6 kN, and the maximum slip value is 0.086 mm;. The maximum slip value is only 34. 3 kN, of the designed load, and the maximum slip value is 0.086 mm; under the design moving load. The maximum shear strength of single nail is 27 kN, and the maximum slip value is 0.163 mm.. The existing shearing bolt of Parrot Bridge has good working performance and has a large bearing capacity.
【作者单位】：华中科技大学土木工程与力学学院;武汉工程大学环境与城市建设学院;中南电力设计院;
【基金】：国家自然科学基金项目(51178203)
【分类号】：U441;U448.38

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