乐山奥体中心体育场车辐式单、双层组合索网罩棚结构设计

针对乐山奥体中心体育场索膜罩棚西侧外高内低、东侧内高外低的不对称构形,提出并设计了一种车辐式单、双层组合索网结构,充分发挥单、双层索网各自特点,此类型组合索网结构系国内外首例.针对此类结构的找形方法、关键影响参数、力学特点、屋面排水组织、整体稳定性、抗倒塌性能、关键节点进行了研究.结果 表明:采用以力密度法为基础的"虚...

Design of Leshan Olympic Center Stadium dome of spoke tension structure with single-double-combined layer cable

This paper proposes a spoke tension structure with single-layer and double-layer combined cable, which is the first application in the world on Leshan Olympic Center Stadium dome with an unsymmetrical shape. Some problems about the single layer and double layer combined cable design are discussed, such as form-finding method, key parameters, mechanics features, roof drainage measures, stability of cable structure, anti-collapse performance, and key joints. A form-finding method called ‘virtual strut method’ is proposed based on force density method, which avoids iteration and finds the cable structure shape directly and easily by changing performance parameters. The static analysis show that the structural rigidity of the single-layer cable is much smaller than the double-layer cable, which is controlled by prestress mainly, and the fall of the single-layer part will result in the rise of the double-layer part. Roof rainwater in the west flows to the inner ring, and then to the south or north circumferentially, and finally to outer ring radially. Meanwhile, roof rainwater in the east flows to the outer ring directly. Some additional drainage measures are needed to rain deposition in low slope places. It proves that the crossing of single-layer inner cable and double-layer inner cable can improve the stability of cable structure significantly. By cable-breaking analysis，it proves that damage of single radial cable will not lead to failure of the whole structure. Some key joints are proposed by comparing the mechanics and the construction convenience.