In the seismic analysis, the boundary condition of a container crane is a complex problem when dealing with the contact between the crane's toes and the ground surface or wharf deck. In operation, the wheels of container cranes move on rails freely but are usually anchored when at rest. Therefore, the wheels could be lifted up and derailed due to seismic excitation. The boundary condition of a container crane has not been fully addressed in past research. It has mostly been simplified as pin supports without considering the possibilities of uplift and derailment of the crane legs. Hence, there is a need to conduct a study focusing on the effects of derailment and uplift on a container crane's seismic response. This paper investigates the seismic response of a container crane via a shake table testing of a 1/20 scale crane constructed according to the similitude law, with a simulation of the boundary condition of the scale crane as a pin and a friction boundary. A white noise test was conducted to determine the natural frequencies of the scale crane, then the seismic response of the container crane was determined via three input ground motions. The three input ground motions were designed by matching real earthquakes to the Korean design elastic response spectrum and scaling down for the shake table testing. Under these seismic excitations, the responses of the container crane were considered in terms of uplift, derailment, portal movement, and bending moments. The shake table testing shows that the maximum difference in the natural frequencies of the crane for the portal sway mode, between the friction boundary and pin support, was 2.1%. Due to the effects of derailment and uplift of the landside legs, the bending moments in the crane's seaside legs with a friction boundary were 109% higher than those with a pinned boundary. In addition, a residual deformation was observed in the portal frame after the vibration had stopped when the scale crane was assigned a friction boundary.

在地震分析中，集装箱起重机的边界条件在处理起重机脚趾与地面或码头甲板之间的接触时是一个复杂的问题。在操作中，集装箱起重机的车轮在轨道上自由移动，但通常在静止时锚定。因此，车轮可能因地震激发而被抬起和脱轨。集装箱起重机的边界条件在过去的研究中没有完全解决。它大多被简化为销支撑，而没有考虑起重机腿上浮和脱轨的可能性。因此，有必要开展一项研究，重点研究脱轨和抬升对集装箱起重机地震响应的影响。本文通过对1/20比例起重机的振动台试验研究了集装箱起重机的地震响应，该振动台是根据相似定律建造的，模拟起重机的边界条件为销钉和摩擦边界。进行白噪声测试以确定秤起重机的自然频率，然后通过三个输入地面运动确定集装箱起重机的地震响应。三个输入地震动是通过将真实地震与韩国设计弹性响应谱相匹配并按比例缩小用于振动台测试而设计的。在这些地震激励下，集装箱起重机的响应被考虑在抬升、脱轨、门架运动和弯矩方面。振动台试验表明，在门式摆动模式下，摩擦边界和销支撑之间的起重机固有频率的最大差异为 2.1%。由于陆侧支腿脱轨和抬升的影响，具有摩擦边界的起重机海边支腿的弯矩比固定边界的高109%。此外，当天平起重机被分配摩擦边界时，在振动停止后，门架中观察到残余变形。