Earthquake And Wind Resistant Analysis Of A New Complex Ferris Wheel Structure

Weifang Bailanghe Ferris Wheel is the first no-shaft Ferris wheel in China with the use of grid style.Its structure is new and complex,and the distribution of the inertial forces is complicated.In addition,as an important recreational facility,the requirements of safety performance and comfort degree are higher.Therefore,it is necessary to analyze the aseismic and wind-resistant properties of this Ferris wheel,and provide suggestions and references for the design of similar structures in the future.The main contents are presented as follows:(1)The finite element model of the Ferris wheel was established by using the finite element software ANSYS,and the dynamic characteristics of the Ferris wheel was studied.The results showed that the basic frequency of the structure was lower and its frequency spectrum was concentrated.The main modal shapes reflected vibration in y direction,which means the stiffness of the structure in y direction was smaller.(2)The responses of the structure under frequently occurred earthquake were analyzed with both the response spectrum method and the time-history analysis method,and the results obtained by the two methods are compared.The responses of the structure under rare earthquake were studied using the dynamic elastic-plastic time-history method.Under the frequently occurred earthquake and rare earthquake,all the structural members were in the elastic stage and the deformation of the structure met the requirement of Chinese code,and the seismic performance of the structures was good.(3)Based on the AR linear filter method,the program of generating the fluctuating wind speed time-history was written by MATLAB platform.Then,the fluctuating wind speed time-history of the spatial node of the Ferris wheel structure was simulated.The simulation results showed that the AR linear filter method could simulate the wind speed time-history very well.(4)The wind speed time history was transformed into the wind load time history and input into the ANSYS finite element model,then the wind-induced response of the structure was analyzed under ultimate state and operation state respectively.The results showed that the structure satisfies the safety and comfort degree requirements.At last,the displacement wind vibration coefficient of the structure under different wind direction angle was calculated,and the wind vibration coefficient of this kind of structure was proposed.