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为分析大跨桥梁在脉动风作用下的抖振响应,针对传统桥梁抖振计算采用的广义振型为三维空间状态,分析过程复杂等问题,提出基于独立振型的抖振分析思路,以经典结构动力学理论和风洞试验为基础,根据能量守恒原理,将以广义振型表示的抖振响应分析过程表达为易于采用矩阵表示的n个独立振型的形式,使得结构动力计算由三维空间状态转化为一维状态,简化了分析过程,并且很容易获得关心自由度上的抖振响应,在此基础上,采用该方法对1座主跨800m的三跨悬索桥进行了抖振响应分析。研究结果表明:由于大跨度桥梁主梁刚度较小,其在脉动风作用下的抖振位移响应数值较大,结构设计中不能忽略。
In order to analyze the chattering responses of long-span bridges under pulsating wind, aiming at the problems of the traditional vibration modes such as the three-dimensional space state and the complicated analysis process, the chattering analysis method based on independent modes is proposed. Structure dynamic theory and wind tunnel test, according to the principle of energy conservation, the analysis of the chattering response expressed by the generalized mode is expressed as the form of n independent vibration modes that can be easily expressed by the matrix, which makes the dynamic calculation of the structure from three dimensional space The state is transformed into a one-dimensional state, the analysis process is simplified, and the chattering response on the degree of freedom of interest is easily obtained. Based on the analysis, the chattering response of a three-span suspension bridge with 800 m main span is analyzed. The results show that due to the low rigidity of the main beam of the long-span bridge, its vibration response under pulsating wind is large, so the structural design can not be neglected.