Through the modal analysis, it is found that main vibration modes of floating crane structure are swing of rope-load system and vibration of boom, and the vibration frequencies are low;
通过模态分析发现，浮吊结构的振型主要表现为主钩钢丝绳-吊重系统摆动和臂架振动，振动频率都很低；
Integral instability of a gantry crane causes structure to lose load supporting capability.
龙门起重机的整体失稳导致结构丧失承载能力。
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