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鉴于混合剪力连接件受力特性的复杂性,以厦漳跨海大桥北汊主桥为工程背景,在模型试验研究的基础上,采用壳-梁-实体精细化有限元数值方法对钢锚梁-钢牛腿组合索塔锚固结构混合剪力连接件受力状态、传力机理及其影响因素进行研究。结果表明:焊钉群竖向剪力横桥向上整体呈现边缘大、中间小的分布趋势;竖向上牛腿顶板以上钉群竖向剪力自上向下逐渐增加,顶板以下区域呈马鞍形分布。焊钉群较大轴向拉力出现在牛腿顶板对应位置,较大轴向压力出现在牛腿腹板高度对应位置。PBL剪力键群承担的竖向力和水平力均表现出中间大、边缘小的分布规律。混凝土塔壁承压、竖向力的变化以及面外弯矩的作用,对索力竖向分力在混合剪力连接件间分配的影响依次增大。
In view of the complexity of the force characteristics of hybrid shear connectors, taking the Beixiao main bridge of Xiamen-Zhangzhou Sea-Crossing Bridge as the engineering background, based on the model test and study, the finite element method of shell-beam- Research on Force State, Force Transmitting Mechanism and Influencing Factors of Mixed Shear Connection of Beam - Steel Leg Combination Pylon Anchorage Structure. The results show that the vertical shear force of the welding nail group shows a large distribution of edges and a small distribution in the middle of the vertical bridge. The vertical shear force of the nail group above the ceiling of the corbel gradually increases from top to bottom, and the area under the roof is saddle-shaped . Larger axial nail welding group appeared in the corresponding position of the ceilings, large axial pressure in the corresponding position of the height of the ceilings. The vertical and horizontal forces borne by the PBL shear key group all show a large distribution of the middle and small edges. The influence of concrete tower wall pressure, vertical force change and out-of-plane bending moment on vertical distribution of cable force between mixed shear connectors increases in turn.