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引言1940年塔科马海峡桥的事故迅速引起人们对悬索桥动力问题的重视。据此,开始进行一些关于悬索桥振动特性的研究,研究结果发现,不仅仅足风,各种动载,诸如行走的车辆和地震都可能引起剧烈的振动。近年来,用计算机进行了一些悬索桥自由振动的分析,以便得到足够数量的有实用精度的固有频率和振型,大多数这类分析是基于理想化的结构,即用质量和弹簧体系来代替实际结构。下面的研究提出了另一种用计算机和有限单元法分析悬索桥竖向自由振动的方法,这种方法用于求解桥梁各个构件的固有频率,振型和能量吸收能力。
Introduction The accident of the Tacoma Strait Bridge in 1940 quickly attracted people’s attention to the power problems of suspension bridges. As a result, some studies on the vibration characteristics of suspension bridges began. The study found that not only the full wind but also various types of dynamic loads, such as walking vehicles and earthquakes, can cause violent vibration. In recent years, some free-vibration analysis of suspension bridges has been carried out by computer to obtain a sufficient number of practical frequencies and modes of practical accuracy. Most of these analyzes are based on an idealized structure that replaces the actual structure. The following study presents another method to analyze the vertical free vibration of suspension bridges by computer and finite element method. This method is used to solve natural frequency, mode shape and energy absorption capacity of various components of bridges.