【摘要】 为了研究高耸结构在地震作用下的动力特性,以HHT变换和简谐地震反应理论为基础,采用振型分解法对多自由度体系进行地震瞬态反应计算和分析,获得了长短周期结构的位移响应特征的差异;并提出了多自由体系的长短周期结构的判定标准。最后研究了某一烟囱在地震动作用下的动力特性,研究表明:120m高的烟囱在地震波作用下,在高度约50m以上的部分结构总位移受瞬态振动控制,体现了长周期结构的动力响应特性;在高度约50m以下的部分结构总位移受稳态振动控制,体现了短周期结构的动力响应特性。得出的有益结论为研究高耸结构在抗风振设计、施工荷载和突发性意外横向荷载作用下的结构性能提供一些基础性的资料。更多还原

【Abstract】 Based on HHT and harmonic earthquake response theory,the dynamic properties of skyscraper structures under seismic motion are studied.Using model superposition method,computation and analyses of earthquake transient response of MDOF systems are conducted.Different characteristics of displacements of long-period structures and short-period structures are obtained,and criteria put forward.The study of the dynamic properties of a high chimney under seismic motion reveals that when a 120-meter-high chimney is subjected to earthquake wave,the displacement of the structure above 50m is controlled by transient vibration,which reflects the long-period characteristics of displacement response,while the displacement of the structure below 50m is controlled by steady vibration,which reflects the short-period characteristics of displacement response.更多还原