九堡大桥引桥组合梁焊钉受力性能研究

九堡大桥引桥为多跨连续组合箱梁桥,截面为开口梯形钢梁与混凝土桥面板组合形式,钢梁与混凝土板间设置了大量的圆柱体焊钉连接件,连接件受力形式与传统钢板梁组合桥不同。文中结合该工程,采用ANSYS有限元程序建立其空间实体模型,采用弹簧单元详细模拟了焊钉,计算了焊钉连接件的受力,分析了焊钉连接件的受力特点。结果表明:焊钉连接件不仅承受沿纵桥向的剪力,还承受沿横桥向的剪力及沿竖向的拉拔力,连接件所受的剪力和拉拔力在全桥范围分布规律复杂。

MECHANICAL BEHAVIOR OF STUD SHEAR CONNECTORS IN COMPOSITE GIRDER OF APPROACH BRIDGE OF JIUBAO BRIDGE

The approch bridge of Jiubao bridge was a multi-span continous composite bridge,whose cross section composed of open trapezoid section steel girder and concrete slabs.Magnitude of headed studs were layout at the interface of steel girder and concrete slab.Mechanical behavior of studs in this type of composite beam is different from that in the steel plate composite beam.Combined with this project,finite element program ANSYS was used to set the solide spatial model in which spring elements were adopted to simulate the studs.Thus mechanical behavior of studs were achieved and analyzed.The analysis results show that: studs carry not only longitudinal shear force along the bridge;but also transverse shear force and vertical tension force,the distribution patterns of these forces along the whole bridge were complex.