Study On Structural Performance Of Single Elliptical Reticulated Shell With Central Opening

Reticulated shell,as a kind of curved surface space grid structure,has the characteristics of good mechanical behavior,direct transmission line,light weight,low cost and graceful shape.In order to meet the architectural requirements and architectural requirements of large span venues,theaters and exhibition halls,more and more reticulated shells with openings at the top have been built.At present,the regulations on the opening of reticulated shells in our country are still not clear.Based on the actual project,the sports center roof as the research object,using SAP2000 structure analysis,analysis,analysis of vibration characteristics and seismic stability of the static performance of the special-shaped reticulated shell structure with central hole.The influences of different support constraints on the bearing capacity of reticulated shell are compared and analyzed.Firstly,this paper introduces the general situation of the shell structure of the project and the loading conditions,the static performance analysis of the single-layer latticed shell structure with central hole by using the SAP2000 software,the shell structure of bearings in different loading combinations under the action of force,the axial force and node displacement.The analysis shows that the reticulated shell has stronger whole space action,larger structural rigidity and better static characteristics.The effects of different support constraints on the static performance of the central open shell are compared.Secondly,the whole stability of the single-layer reticulated shell is analyzed.The geometric nonlinear analysis of the structure under consideration of initial imperfections is carried out to determine the structure load displacement curves and critical loads.It is concluded that the buckling factor of eigenvalue buckling analysis is too large and can only be considered as the upper limit of nonlinear global stability analysis.The stability analysis of open single-layer reticulated shells should take into account the influence of geometric nonlinearity.The influence of different support constraints on the stability of the central open shell structure is compared.Thirdly,the modal analysis is used to study the natural vibration characteristics of reticulated shell,and the change law of the frequency of the shell structure is obtained.It is concluded that the natural frequency distribution of the reticulated shell is intensive,and the correlation between the vibration modes should be taken into account when the vibration mode response spectrum method is used for dynamic analysis,so as to obtain accurate results.Finally,this paper using the mode decomposition response of dynamic reticulated shell under single dimensional and multidimensional seismic response spectrum method,the seismic condition of rod structure internal force distribution,and using the time history method of checking.The analysis results show that the modal response of the structure is in error,and the direct integration method should be used to calculate the seismic response.The influence of different support constraints on the seismic performance of the central open shell structure is compared.