铜仁奥体中心体育场车辐式张拉索膜罩棚结构设计研究

Design and research on spoke tensioned cable membrane canopy structure of Tongren Olympic Sports Center Stadium

针对铜仁奥体中心体育场椭圆形车辐式张拉索膜罩棚结构,对其结构体型、雪荷载分布、整体稳定性、抗倒塌性能、索夹抗滑移承载力进行了专项研究。研究结果表明:车辐式索网结构内环与外环平面投影形状相似,径向索沿环索法向布置为力学状态最优方式,可使屋盖整体结构为重力作用下自平衡体系;外环采用冗余度较高的水平桁架可显著减小径向索破断后内环形状突变对外环受力的影响;利用风致积雪试验确定雪荷载分布;根据极限承载力分析,验证了增加内环交叉拉索可显著提高结构整体稳定性;通过抗倒塌分析,保证了整体结构在偶然断索状况下的安全性;最后,通过试验确定了环索索夹抗滑移承载力。

The special researches were conducted on the structural shape,distribution of snow load,overall stability,anti-collapse performance and anti-sliding bearing capacity of cable clamp of the oval spoke tensioned cable membrane canopy structure of Tongren Olympic Sports Center Stadium.The research results show that the plane projection shape of the inner ring bearing and the outer ring of the spoke tensioned cable net structure are similar,and the arrangement of radial cables along the normal direction of the ring cable is the optimal mode of mechanical state,which can make the overall structure of the roof self-balance system under the action of gravity.Using the horizontal truss with higher redundancy of the outer ring can significantly reduce the influence of the sudden change of the shape of the inner ring on the stress of the outer ring after the radial cable is broken.The distribution of snow load is determined by wind-induced snow cover test.According to the analysis of ultimate bearing capacity,it is verified that the increase of inner ring cross stay cable can significantly improve the overall stability of the structure.The collapse resistance analysis ensures the safety of the whole structure under the condition of accidental cable break.Finally,the anti-sliding bearing capacity of cable clamp is determined by experiments.