柔性摩天轮结构抗震性能研究

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振动与冲击 ›› 2013, Vol. 32 ›› Issue (12) : 76-83.

论文

柔性摩天轮结构抗震性能研究

游桂模1，丁洁民2，杨晖柱1

作者信息 +

Seismic behaviors of flexible Ferris wheel

YOU Gui-Mo1 DING Jie-Min2 YANG Hui-Zhu1

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文章历史 +

摘要

本文以208m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。

Abstract

Base on a case study of 208-meter-high Ferris wheel under construction, both dynamic characteristic and seismic behavior were studied with ANSYS. Firstly the natural vibration characteristics of various structure parameters were studied. The numerical results indicated that basic frequency was on the small side and frequency spectrum was concentrated. Main mode shape of vibration was rim’s vibration itself because stiffness of rim structure was small. Then the responses of the structure under frequent earthquake were analyzed using both the response spectrum method and time-history method respectively. Structural deformation met the requirements of Chinese code for seismic design of buildings. Stress of whole structure’s members was small and met the requirement of no-damage under frequent 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 seismic design of buildings and no-collapse under rare earthquake.