Research On Dynamic Response Of Fully Flexible Giant Ferris Wheel With Double Flanges

At present,the Ferris wheel has become a symbol of the construction level of spiritual civilization.Ferris wheel not only has the function of amusement facilities,but also brings enormous economic benefits and extensive and far-reaching social benefits.It also promotes the progress and development of various industries,but in terms of the structural system.In order to ensure safety and economical,the weight of the Ferris wheel was lightened.While the safety of flexible cables and double rim structures becomes an urgent problem to be verified.In this paper,through theoretical calculation and finite element analysis,the structural design,safety and response of the flexible double-rim Ferris Wheel under wind and ground motion loads are analyzed and studied for specific engineering projects.First of all,through the analysis of the force combination of the fully flexible Ferris wheel,it is concluded that the calculation of the prestress of the rope is the premise of the over-all structure design.On this basis,the relationship between the rope pretension and the flange deformation is studied.It is found that the inner roundness of the rim is inversely proportional to the change of the initial pretension of the cable.At the same time,the influence of rope sag on metal fatigue of Ferris wheel is analyzed.It is found that the greater rope sag,the smaller the stiffness,the lower the first-order resonance frequency and the more obvious the low-frequency wind vibration effect,so it is easy to cause metal fatigue and fracture.Secondly,the stability analysis of the structure of the flexible Ferris wheel with double rim is carried out,and the dynamic response of the structure under wind load and earthquake load is considered respectively.Before the dynamic response analysis,the prestressed modal analysis of the structure is carried out,and the cross-sectional area of the rope and the influence of the prestressed rope on the modal frequency of each order of the structure are analyzed respectively,and the modal shapes of each order are extracted.It is found that the larger the cross-sectional area of the rope,the greater the natural vibration frequency of the rope.When the cross-sectional area of the rope increases from 1080 mm to 2140 mm.The first-order vibration frequency increases from 0.34659 Hz to 0.38892 Hz,and the other vibration frequencies follow similar rules.When Ferris wheel is affected by earthquake,the maximum displacement of Ferris wheel is 39.2mm,which occurs on the outside side of the middle wheel of Ferris wheel.The maximum stress is at the junction of stable cable and tower top,and its stress is 154.1MPa.The maximum displacement of the Ferris wheel is 43.4mm and the lateral displacement ratio is 1/2765.The maximum stress of the Ferris wheel is 121.4Mpa,which meets the design requirements of the national standard.After the equivalent static and dynamic load response analysis of the double-rim fully flexible Ferris wheel structure,the safety and stability of the structure are verified,which provides theoretical support for the double-rim fully flexible structure of the Ferris wheel.