风荷载作用下复杂雨棚结构UHPC人行天桥关键节点分析

Analysis on Key Nodes of UHPC Pedestrian Bridge with Complex Canopy Structure under Wind Load

摘要:

因景观造型的需求，天桥雨棚常设计为复杂的异型结构，在风荷载作用下，会对板厚较薄的UHPC主梁结构受力产生较大影响。以广州某道路快速化改造工程中一座UHPC箱梁人行天桥为研究对象，对风荷载作用下复杂雨棚结构UHPC人行天桥关键节点进行了分析研究，包括装配式超高混凝土桥梁的抗扭计算，扭矩较大的预制箱梁节段接缝处理，雨棚主杆件在箱梁锚固点处处理方式，超宽运输宽度的天桥梯道牛腿及横隔板的后浇处理方式等。

Abstract:

Due to the requirements of landscape modeling, the canopy of the pedestrian bridge is often designed as a complex special-shaped structure. Under the action of wind load, it will have a greater impact on the force of the UHPC main beam structure with thin plate. Taking a UHPC box girder pedestrian bridge in the expressway reconstruction of a road in Guangzhou as the research object, the key nodes of the UHPC pedestrian bridge with complex canopy structure under wind load are analyzed and studied, including the anti-torque calculation of prefabricated ultrahigh concrete bridge, the joint treatment of precast box girder segment with high torque, the treatment mode of main canopy bar at the anchoring point of box girder, and the post-pouring treatment of bridge stairway corbels and transverse partitions with super-wide transportation width.