Dynamic Performance Analysis Of The Single-Layered Cylindrical Grid Shell

As we know,among the long-span spatial structures , the grid shell structure has many advantages compared to the other spatial structure.The processing can be.standardized.and.normalized.because.the.combination.of. The.reasonableness of mechanics and the economy production.The characteristics of light make materials transport and installation convenient. This structure has more wider application than the others because of more mature design tools. At present,the static stability problem of spatial structure has been well solved,but the research about dynamic properties and seismic performance is imperfect,especially about single-layered cylindrical grid shell.So this paper does some research about the vibration characteristics and seismic performance on the base of numerical analysis.Firstly, on the basis of wide-range reading of relevant internal and foreign documentation datum about the grid shell structures, this paper looks back and summarize systematically developed history,researching present status and the application about engineering experience of the Hybrid-structure. This paper also introduces background of the single-layered Cylindrical Grid Shell, researching present status and the application about engineering experience of the single-layered cylindrical grid shell. Then the main contents are pointed out.Secondary, the finite element equation of the single-layered cylindrical grid shell is established and the choices about solving means of nonlinear system of equations are introduced in this paper. This paper also introduces the features of the ANSYS analytical software and the characteristics of the elements .It also summarizes the static characteristics of the mature single-layered cylindrical grid shells,laying the foundation of the subsequent analysis of the dynamic properties of the structure.Subsequently, finite element analysis of auto oscillation characteristics of the top structure is analyzed by use of structural dynamic theory and subspace method. Structural frequency, corresponding vibration shapes, stiffness distribution and basic auto oscillation characteristics of the top structure are ascertained and grasped. The influence on structural auto oscillation characteristics of different parameters(these parameters include vector cross-over, roof quality,long-span ratiao,span) and change condition of frequency and corresponding vibration shapes are researched and analyzed. Then, shock-resistant capability of the top structure is researched by use of the spatial multi earthquake modal response spectrum theory.The theory also analyzes node time-displacement curve.Mainly by the time-course analysis,to do dynamic analysis about the single-layered cylindrical grid shell structure.And it also discusses and analyzes the changes of the parameters (inclding vector cross-over, roof quality,long-span ratiaoand span ) in the different direction of dynamic internal force,and the changes about the moving internal forces and displacement in the different parameters.By doing more in-depth studies about the force Performance under the seismic behavior in this structured concludes something benefits structuredesign.Ultimately, the conclusions of static and dynamic capability are drawn on the basis of analysis and research about single-layered cylindrical grid shell and the recommendation and perspectives are put forward.