Study On Analysis Method And Application For The Seismic Response Of Quayside Container Crane

Quayside container crane is an essential handing equipment at the port.With the development of the large scale of the container crane,it is more likely to be damaged by the earthquake.Present study on the seismic response analysis method of the quayside container crane is lack of systematic theory,and the existing seismic conditions design method is simple,which resulting in an increase of the structure weight and the cost of normal operation and maintenance.This paper focus on the quayside container crane as the research object,analyzes the elastic dynamic response characteristics,elastic-plastic dynamic response characteristics and seismic collapse resistant capacity of the quayside crane under the different earthquake magnitude by the finite element simulation and vibration mechanical model.The main research contents and results are as follows:(1)The two boundary conditions of the wheel-rail friction contact analysis modal and the articulated analysis modal are established.The dynamic time analysis method is used to compare the seismic response of different key positions under the two boundary constraint modals,which explores the influence of the friction contact analysis modal in analyzing the seismic dynamic behavior characteristics.Based on the friction contact model,a series of geometric amplitude seismic wave acceleration history curves are applied to seismic response analysis in the vertical track direction and parallel track direction.Through comparing the seismic response development tendency in different seismic input directions,the sensitive direction of the quayside container crane under the earthquake action is analyzed.(2)The shake table test of a 1:20 scaled container crane is carried out,and the vibration test plan is designed to verify the reliability of the finite element simulation analysis.The seismic design response spectrum is constructed which is compared with the results of static method analysis.A conclusion is drown that the deviation of the wheel pressure obtained by static method and the actual wheel pressure under earthquake action makes the structure weigh of the crane increased,which causes the rise in the economic cost of the crane structure design.In addition,a vibration mechanical analysis modal of four degrees of freedom is proposed,and the numerical response curves of different critical position are obtained,which are compared with the previous finite element simulation results.The consistency of response curves between the two analysis methods illustrates the mathematical modal accurate and reliable.(3)The elastic-plastic dynamic response is obtained considering the nonlinear factors of materials,which are compared with the elastic response results.Above analysis results illustrate that the internal force response is reduced of the yielding position of the crane and the deformation response is increased,while the increase is not obvious.Besides,the difference of seismic dynamic response influence caused by gravity second-order effect between elastic dynamic response and elastic-plastic dynamic response of the crane is analyzed.The results show that the elastic-plastic dynamic analysis requires gravity second-order effect which makes a greater difference on yielding structure.(4)Based on the incremental dynamic analysis method,the seismic collapse resistant capacity of the quayside container crane is analyzed.By comparing the IDA curves of different internal forces and deformation parameters,it is found that the displacement response is reasonable as the structural damage index.Then,the IDA curves of different height positions of the crane are compared and analyzed,which shows the pillar of the quayside bridge below port frame structure cross beam is the weakest seismic resistant position.In addition,the seismic collapse resistant performance of the whole crane structure is evaluated.The results illustrate that the yielding connection position of the pillar and port frame structure cross beam is destroyed primarily,which causes the overall collapse of the quayside container crane under the severe earthquake impact.