Study On Static And Dynamic Characteristics Of A Single-layer Latticed Shell Structure With Bidirectional Spiral Lines

Because of the advantage of perfect load-carrying performance, light weight,large span and diverse form, latticed shells are widely used in engineering projects. Tothe background of the single-layer latticed shell structure with bidirectional spirallines of the Yujiapu Railway Station, using the ansys finite element software, someresearch was done from the following aspects, and some conclusions were gotten.The analysis on static performance of the single-layer latticed shell structure withbidirectional spiral lines. It mainly included: the analysis on static characteristics ofthe structure; the analysis on the impact of the rotation of box section beams aroundtheir axes on the static performance of the structure; the analysis on the impact of theconstraint forms on the static performance of the structure. The following conclusionswere gotten: the maximum stress, the maximum stress ratio about stability and themaximum displacement of the structure all met the requirements of designspecifications, but the shearing of the horizontal reaction force to supports should befully taken into account; through comparative analyses, it was concluded that theimpact of the rotation of box section beams around their axes on the staticperformance of the structure was very little, but it was very significant to a singlebeam, which should be fully taken into account in the analysis of a single beam;through analyses of the constraint forms, it was concluded that the constraintcondition of this structure was reasonable, which was called normal hinging constraintwithout tangential constraint.The analysis on dynamic characteristics of the single-layer latticed shell structurewith bidirectional spiral lines. It was about three parts: the natural vibrationcharacteristics of the structure; the impact of the rotation of box section beams aroundtheir axes on the dynamic performance of the structure; the impact of the constraintforms on the dynamic performance of the structure. The following conclusions weregotten: The fundamental frequency was1.52Hz, and the stiffness was well. It wasbetter to choose the1st to the90th modes to study. Translational vibration modelswere major. The fundamental frequency and the stiffness were a litter lager after the rotation. The constraint condition of this structure was reasonable, which was callednormal hinging constraint without tangential constraint.The mode decomposition response spectrum analysis and the seismic checking ofthe single-layer latticed shell structure with bidirectional spiral lines. The responses ofthe structure under frequent and rare earthquake actions were analysed respectively,and the section seismic checking was done. The following conclusions were gotten:the structure was more sensitive to the earthquake of y direction, but less sensitive tothe earthquake of z direction; the stiffness of the structure was sufficient underfrequent and rare earthquake actions, and the internal force and deformation met therequirements.The time history analysis of the single-layer latticed shell structure withbidirectional spiral lines. The responses of the structure under frequent and rareearthquake actions were analysed respectively by three selected seismic waves, whichwere compared with the results by the method of the mode decomposition responsespectrum. The following conclusions were gotten: The structure seismic checkingcould meet the requirements of seismic design by the method of the modedecomposition response spectrum. The results with the method of the modedecomposition response spectrum could be verified by the method of the time history.The analysis on wind-induced vibration response of the single-layer latticed shellstructure with bidirectional spiral lines. Firstly, total wind speed time series indifferent locations of the structure surface were imitated, which included pulsatingwind. Secondly, the wind pressure coefficients in different locations of the structuresurface were gotten by the wind tunnel model tests of the structure. Thirdly, dynamicwind loads in different locations of the structure surface were gotten. Lastly, thewind-induced vibration response of the structure was gotten through the time historyanalysis of the structure. As a result, the wind vibration coefficients of the structurewere gotten, which could be used to guide the analysis and design of the structure.