Study On Seismic Response And Method Of Vibration Control Of Quayside Container Crane

As an important equipment for modern port loading and unloading,quayside container cranes play a pivotal role in the port.At present,there is insufficient research on the seismic response of the container crane,which cannot provide systematic guidance for container cranes seismic design.The static method is still used for the seismic design of container crane.In this dissertation,a typical super panama container crane is taken as the research object,through the method of simulation analysis and dynamic model,and the dynamic characteristics and random vibration of different directions of seismic excitation are analyzed.And the simplified model of seismic response analysis and method of vibration control of container crane are studied.The main research work is as follows:(1)The modal analysis is carried out to analyze the natural vibration characteristics of the container crane under two conditions,the beam is horizontal or raised up;Several classical seismic waves are selected for dynamic time history analysis,and the response characteristics of the container crane structure under the seismic action of two directions,parallel to and perpendicular to the crane track,are analyzed respectively.Then the influence of the seismic action in the direction parallel to the crane track on the seismic response of the container crane structure is explored.(2)Through the random vibration analysis method,the Du Xiuli-Chen Houqun ground motion model is selected to conduct a multi-dimensional random seismic response study of the container crane structure,and the influence of different directions combined seismic excitations on the internal force and displacement response of the shore bridge structure is analyzed.Then,the seismic excitation response analysis of different site conditions and the incidence angle of seismic wave for the horizontal structure of the beam of the container crane are carried out respectively,and the influence of the site conditions and the incidence angle of the seismic wave on the seismic response of the quayside structure is explored.(3)A dynamic model for seismic response analysis of a four-degree-of-freedom container crane structure is established,and the feasibility of the established dynamic model is verified by comparison with the results of finite element simulation analysis;then using the multi-degree-of-freedom dynamic model of the container crane and by changing the mass and stiffness parameters of different degrees of freedom,the effects of the mass and stiffness of the shore bridge structure on the seismic response of the container crane structure are analyzed.The results show that the changes in the stiffness of the first layer and the mass of the third layer of the container crane have the greatest impact on the seismic response of the container crane structure.(4)A rocker-type vibration control system with viscous damper for vibration control of beam is proposed.The mechanism of the system’s damping action and the influence of system parameters are analyzed,then the appropriate seismic parameters are selected to analyze the seismic response time history of the container crane structure with a rocker-type vibration control system.By comparing and analyzing the response results of the container crane structure with or without a vibration control system,it is verified that the proposed damping system is effective for vibration control to improve the stability of beam.