- 摘 要
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（1 湖南大學土木工程學院鋼結構研究所， 長沙 410082； 2 湖南科技大學土木工程學院， 湘潭 411201）
［摘要］李自健美術館圓環(huán)結構支承于3個相距50m的帶斜撐鋼結構筒體，最大懸挑長度為19m，最大跨度為45m。以結構動力學理論為基礎，采用數(shù)值模擬方法對結構施加單人行走、多人同步行走、隨機行走、同步起立、單人跳躍、多人跳躍等23種激勵，驗算其振動舒適度。主要研究人致激勵下結構的動力時程響應，將各工況下結構的峰值加速度與美國鋼結構設計協(xié)會（AISC）規(guī)定的限值對比。結果表明，結構人致振動舒適度滿足要求。研究發(fā)現(xiàn)，在對此類復雜結構進行人致振動舒適度設計時，應選取結構敏感頻率范圍內的所有最不利振動區(qū)域進行分析，并根據建筑使用功能選取激勵工況，充分考慮結構在使用周期內可能出現(xiàn)的所有激勵形式，尤其是節(jié)律性激勵，如跳躍和起立激勵。
［關鍵詞］振動舒適度； 人致激勵； 峰值加速度； 大跨樓蓋
中圖分類號：TU391文獻標識碼：A文章編號：1002-848X(2018)15-0019-06
Study on vibration serviceability of circular structure of Li Zijian Art Museum under human-induced excitation
Shu Xingping1, Tian Mengdi1, Lu Beirong2, Liu Zelong1
(1 Steel Structural Institute of Civil Engineering College， Hunan University， Changsha 410082， China; 2 College of Civil Engineering， Hunan University of Science and Technology， Xiangtan 411201， China)
Abstract:The circular structure of Li Zijian Art Museum is supported on the 3 steel core tubes with braces, which are 50m apart. The circular structure′s maximum cantilever extends as long as 19m and its maximum span is 45m. Based on the structural dynamics theory, the numerical simulation method was used to evaluate the vibration serviceability of the structure imposed by 23 excitations including single person walking, harmonic walking, random walking, synchronous standing up, single person jumping and harmonic jumping. The main study was to investigate the dynamic time-history response of the structure under human-induced excitation. The peek accelerations obtained from time-history dynamic analyses were compared with the limited accelerations from American Institute of Steel Construction (AISC). Results show that the vibration serviceability of the structure meets requirements. Studies find that, in the vibration serviceability design for such complex structure under human-induced excitation, designers should find out all the most unfavorable vibration areas in the sensitive frequency range to analyze. Excitation conditions should be selected according to the building service functions and designers should consider all the loading modes possibly occurring in the service period, especially the rhythmic excitations, such as jumping and standing up.
Keywords:vibration serviceability; human-induced excitation; peak acceleration; large-span floor
*國家自然科學基金項目（51278178）。
作者簡介：舒興平，博士，教授，博士生導師，Email: shuxingping@sina.com。
