苏州国际博览中心东桥厅带巨型钢桁架复杂结构设计

Structural design of giant steel truss of east bridge hall in Suzhou International Expo Center

苏州国际博览中心东桥厅是一个采用巨型钢桁架跨越市政道路的复杂结构,通过在特定位置设置滑移支座来释放温度应力。介绍了结构设计要点、关键节点构造以及带软钢阻尼球形钢支座的设计、工作原理及模型试验。分析结果表明,合理布置竖向传力系统和抗侧力系统是复杂大跨度结构设计的关键;在结构整体计算模型中建入用于调整基础不均匀沉降的拉梁,并按实际考虑基础刚度是有必要的;合理设置滑移支座能够在有效减小结构温度应力的同时保证结构的抗震性能;带软钢阻尼球形钢支座能够在基本不增加造价的情况下提供结构所需要的阻尼力,性价比较高。

The east bridge hall in Suzhou International Expo Center is a complex structure with giant steel truss which spans the municipal road and releases temperature stress by sliding bearings. Structure design characteristics and critical joint details were introduced as well as the design, operating principle and model tests of sphere steel bearing with soft steel damper. Results show that rational arrangements of vertical force system and lateral force resisting system are the key points to design complex large span structures. In the calculation model, it is necessary to consider actual foundation stiffness and arrange tie beams which adjust uneven settlement of the foundation. Suitable sliding bearings reduce temperature stress effectively and ensure seismic performance of the structure. Sphere steel bearing with soft steel damper can provide the required damping force without increase of the cost.