异形分叉钢箱梁人行天桥设计与分析

Design and Analysis of Special-shaped Forked Steel Box Beam Pedestrian Overpasses

摘要:

随着城市化进程的持续推进，兼具功能性和景观性的异形钢结构人行天桥正逐渐成为城市基础设施建设的重要选择。但异形钢箱梁桥受力复杂，采用梁格模型或单梁模型计算时，结果往往存在偏差。为此，以某简支32 m、Y形钢箱梁人行天桥工程为背景，通过建立板单元有限元模型，分析了异形分叉钢箱梁的设计特点及其在人群、温度等荷载作用下的受力特征。结果表明：异形分叉钢箱梁在纵向弯曲、扭转、畸变等方面存在较大不确定性，通过合理设置横隔板等措施，可以减小不规则外形带来的影响，满足工程设计要求。

Abstract:

With the continuous advancement of urbanization, the special-shaped steel structure pedestrian overpass combining functionality and landscape is gradually becoming an important choice for the construction of urban infrastructure, but the force of special-shaped steel box beam bridge is complex. When using the beam-grid model or the single-beam model for calculation, the results often have deviations. Therefore, taking a 32-m simple-supported Y-shaped steel box beam pedestrian overpass as the background, and through the establishment of plate element finite element model, the design features of the special-shaped forked steel box beam and its force characteristics under the action of loads such as crowds and temperature are analyzed. The results show that the special-shaped forked steel box beam has the considerable uncertainties in terms of longitudinal bending, torsion and distortion. By reasonably setting up transverse partitions and other measures, the influence brought by irregular shapes can be reduced to meet the engineering design requirements.