一、前言 随着港口、矿山等装卸事业的飞跃发展,大型露天作业的起重机(门座起重机、装卸桥等)不断增多。对于这些起重机结构除了必须满足风载荷引起的强度、刚度要求外,还必须特别重视风致振动问题。例如应用极为广泛的门座起重机在非工作状态下经常可以观察到刚性拉杆在垂直风向发生剧烈的振动。1981年12 I. Introduction With the rapid development of loading and unloading operations in ports and mines, the cranes (portal cranes, loading and unloading bridges, etc.) for large-scale open-air operations have been on the increase. In addition to these crane structures must meet the wind load caused by the strength, stiffness requirements, but also must pay special attention to wind vibration problems. For example, the most widely used gantry cranes often observe severe vibration of the rigid tie rods in the vertical wind direction when not in operation. 1981 12