Research on overall stability of the Shenzhen Universiade Sports Centre

A type of structural system named as single-layer folded-plane latticed shell structure was adopted in the steel roof of main stadium of the Shenzhen Universiade Sports Center.The cantilevered span of the steel roof ranges between 51.9m and 68.4m.The steel roof was separated from the concrete grandstand completely and supported in a concrete platform by 20 ball joints.Characteristics of this structure were few border constraints,complicated load path and uncertainty of overall stability.The deformation shape due to initial geometric defect was found by characteristic buckling analysis.Then the overall stability was analyzed by nonlinear method.The influence of key positions and important bars to the overall stability was also studied.The results show that the steel roof is insensitive to initial geometric defect.The overall stability coefficient is close to 3,under the most unfavorable load combination of wind loads in both vertical and horizontal directions and considering both geometric nonlinearity and material nonlinearity.The structure has good overall stability.The progressive collapse will not occur even if the critical and important bars were lost.This structural system is feasible,safe and reliable.