【摘要】 以208 m高的北京某摩天轮结构为研究对象,使用ANSYS对其进行了自振特性和抗震性能分析。首先探讨摩天轮结构自振特性振型特点,并分析了结构随参数变化的自振特性;然后分别采用反应谱法和时程分析法计算多遇地震作用下结构地震响应;最后对结构进行了罕遇地震下弹塑性动力时程分析。研究结果表明:结构基频较低而且结构频谱比较密集,轮盘部分刚度较弱,多数振型以轮盘自身振动为主;在多遇地震作用下,变形指标符合国家现行相关规范要求,整体结构应力水平较低,满足结构弹性、小震不坏的要求;在罕遇地震作用下,摩天轮结构整体结构构件均未屈服并均处于弹性阶段,结构变形指标符合国家现行相关规范要求,抗震性能优于"大震不倒"的抗震性能目标要求。更多还原

【Abstract】 Based on a case study of a 208-meter-high ferris wheel under construction,both its dynamic characteristic and aseismic behavior were studied with ANSYS.Firstly,its natural vibration characteristics with various structural parameters were studied.The numerical results indicated that its basic frequency is lower and its frequency spectrum is concentrated;its main modal shapes reflect rim’s vibration because stiffness of rim structure is smaller.Then,the responses of the structure under frequently occuring earthquake were analyzed with both the response spectrum method and the time-history method,respectively.Its structural deformation met the requirements of Chinese code for aseismic design of buildings.The stress of the whole structure’s members was smaller and met the requirement of no-damage under frequently occuring earthquake.Finally,the responses of the structure under rare earthquake were studied using the dynamic elastic-plastic time-history method.The numerical results demonstrated that the inelastic deformation met the requirements of Chinese code for aseismic design of buildings and no-collapse appears under rare earthquake.更多还原