大跨度及长悬挑楼层钢结构运动场人员舒适度分析研究

Study on comfort analysis of sport field structure with large-span and cantilevered steel floor

以内蒙古伊旗全民健身体育中心工程为背景,对楼层设置运动场的大跨度及长悬挑钢结构振动模拟及结构的人员舒适度问题进行研究。采用基于实测谱的谐波叠加法模拟人员运动荷载和随机振动法模拟悬挑结构脉动风荷载。对大跨度楼层人员舒适度的荷载激励频率、张弦梁拉索预应力度和楼板厚度等影响参数进行分析,考虑可能出现的各种荷载工况,分析运动员及看台观众的舒适度。分析表明:改变楼层预应力不能有效改善大跨度结构使用舒适度;随着楼层板厚增加,结构竖向加速度和自振频率均近似线性降低;运动场内和观众看台宜采用不同的舒适度控制指标。研究结果可为楼层设置运动场的预应力大跨度及长悬挑楼层钢结构工程的荷载模拟、人员舒适度性能目标和控制标准等提供设计参考。

Based on the floor structure of the National Fitness Center in Ejin Horo Banner,Inner Mongolia,the vibration simulation and comfort level of large-span and cantilevered steel floor used as sport field were studied.First,harmonic superposition method based on the measured spectrum was used to simulate human movement loads and the stochastic vibration method was used to simulate the fluctuating wind load on the cantilevered structure.And then,the key parameters about structural comfort of the large-span floor were analyzed.Next,all possible load cases were considered and the comfort level of the athletes and spectators were analyzed.The result shows： changing the floor prestressing cannot improve the large-span structure comfort level effectively;the vertical acceleration and natural frequency decrease approximately in proportion with the increase of the floor thickness.According to the method of this paper,different comfort control indices should be adopted for sports field and spectators stand,respectively.Design references of load simulation,comfort performance index and control standards are provided in this paper for large-span prestressed and cantilevered steel floor structure project that used for stadium.