大跨度索穹顶设计与张拉控制

Design of Large Span Cable Dome and Tension Control

针对索穹顶的概念与特点,结合中国(太原)煤炭交易中心中央采光屋盖工程,结构体系采用大跨度平面索网穹顶形式。通过建立整体非线性有限元模型,对大跨度索穹顶屋盖在地震、风、温度等各类工况下的性能进行详细分析,并对节点进行精细模型验证。索穹顶结构的成形过程中,结构会经过自平衡而使内力重分布,形状也随之改变,所以在预应力施加过程监控显得十分重要,以确保结构在初始状态与设计相符。

Based on the concept and characteristic of cable dome and combine with,large span plane cable net dome form structural system is adoptedfor the central lighting roof of Chinese(Taiyuan)Coal Trading Center.Through nonlinear finite element simulation,performance of the large span cable dome roof is analyzed in detail under all kinds of working conditions such as earthquake,wind,temperature etc.,and the connections are checked by a refined solid model.During the forming process of the cable dome structure,internal forces are redistributed to achieve selfbalancing and the shape is changed simultaneously.Monitoring plays a very important role in the process of exerting prestress to ensure the structure meet with the expected design state.