Effects of Boundary Condition Models on the Seismic Responses of a Container Crane
Effects of Boundary Condition Models on the Seismic Responses of a Container Crane
复制标题
DOI：
10.3390/app9020241
复制
发表时间：
2019-01
期刊：
影响因子：
--
通讯作者：
Jungwon Huh;V. B. Nguyen;Q. Tran;J. Ahn;Choonghyun Kang
中科院分区：
文献类型：
--
作者：
Jungwon Huh;V. B. Nguyen;Q. Tran;J. Ahn;Choonghyun Kang
近年来，几次大地震导致集装箱起重机倒塌，导致货运中断，严重影响了经济。一些报道关注吊车腿的抬升和脱轨事件，以及吊车本身的坍塌。本文以某集装箱起重机为例，研究了不同边界条件对其在地震激励下的影响。利用SAP2000程序对典型集装箱起重机的支腿(轮子)与地面(轨道)的连接进行了分析，考虑了三种不同的边界条件，即销支撑(PIN)、间隙单元(GAP)和摩擦接触(FC)单元。然后，利用所记录的9个地震动进行了时程动力分析。通过考察三种不同的底座边界条件，从底座总剪力、门座漂移和支腿相对位移三个方面研究了集装箱起重机的动力特性。研究结果表明，当地震烈度大到足以产生扬起和脱轨事件时，边界条件模型的选择对集装箱起重机的动力响应有很大影响。此外，当起重机发生上浮和脱轨时，FC支撑状态最符合起重机的实际行为。另一方面，在低地震激励下，不同的边界条件模型的选择对起重机的行为没有明显的影响。
In recent years, several large earthquakes have caused the collapse of container cranes, which have resulted in halting of freighting, and significantly affected the economy. Some reports are concerned the uplift and derailment events of crane legs, and the collapse of the crane itself. In this study, the effects of different boundary conditions used in the numerical method are investigated for a container crane under seismic excitation. Three different boundary conditions are considered in terms of the connection of the crane’s legs (wheels) and the ground (rails), namely pin support (PIN), gap element (GAP), and Friction contact (FC) elements, by using the SAP2000 program for a typical container crane. Then, time history dynamic analyses are conducted using nine recorded ground motions. Dynamic behaviors of the container crane are studied in terms of the total base shear, portal drift, and relative displacement of legs, by investigating the three types of base boundary conditions. The results of the study show that when the intensity of earthquakes is large enough to create uplift and derailment events, the selection of the boundary condition model considerably affects the dynamic responses of the container crane. In addition, when uplift and derailment of the crane occur, the FC support condition is the most compatible with the real behavior of the crane. On the other hand, under low seismic excitation, there is no significant difference of the crane behavior according to the choice of boundary condition model.