桥梁振动问题的内容是很复杂的。本文所谈的仅是在车辆荷载作用下梁式桥跨的铅垂振动问题。这个问题的研究已有一百多年的历史。近年来,由于新型机车车辆的出现,列车速度的提高,以及新型桥梁的出现,对桥梁振动问题提出了新的课题。桥梁的振动问题,因素复杂,只靠理论分析,不能得到实用的结果,一般须采用实验一理论 The content of bridge vibration problem is very complicated. This article is only talking about the vertical vibration problem of beam bridge under vehicle load. The study of this issue has a history of over one hundred years. In recent years, due to the emergence of new locomotives and rolling stock, the increase of train speed, and the emergence of new bridges, new issues have been raised for bridge vibration problems. The bridge vibration problem, the factor is complex, only depends on the theory analysis, can not obtain the practical result, generally must use the experimental theory