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本文采用数值计算与现场测试相结合的方法对上海“东方明珠”广播电视塔下球楼层结构的动力特性进行了研究。文中用有限元方法建立了下球标高86.3米楼层结构承重体系的三维动力分析模型,采用Lanc-zos法对二种工况下的特征值问题进行了求解,并用共振法做了现场测试,得到了楼层结构的自振频率、振型和阻尼等结果,为避免和防止游乐惯性车动荷载作用所产生的干扰与楼层结构发生共振或拍振现象提供了理论依据。
In this paper, the dynamic characteristics of the floor structure of Shanghai “Oriental Pearl” radio and television tower are studied by using a combination of numerical calculation and field testing. In this paper, a three-dimensional dynamic analysis model of the bearing system with 86.3 meters of floor height is established by finite element method. The eigenvalue problem under two working conditions is solved by the Lanc-zos method, and field tests are performed by the resonance method. The results of the natural vibration frequency, vibration mode, and damping of the floor structure provide a theoretical basis for avoiding and preventing the interference generated by the dynamic load of a freewheeling vehicle and the occurrence of resonance or vibration in the floor structure.