Based Open Sees Single-Layer Cylindrical Shells Strong Earthquake Response

Analysis of stability of single-layer cylindrical reticulated shell is a key issue in the research and design.Under the earthquake action,single-layer reticulated shell before the overall buckling of the brace buckling is likely to happen.But current stability analysis of single-layer cylindrical reticulated shell is idealistic,without considering the effects on the internal forces of the structure of brace initial defect such as materials,production,and installation.This paper adopts the initial bending instead of the initial defects,analyze the brace include initial bending by finite element analysis software of OpenSEES,and determine the parameters of initial bending of the brace,provide appropriate solution methods for analyzing effects of initial defects on overall stability influence of single-layer cylindrical reticulated shell under the earthquake.On the basis of consulting the research literature at home and abroad,this paper main research content is as follows:We choose the beam-column elements based on flexibility method(Nonlinear Beam Column),adopt the method of displacement control load,use OpenSEES to analyze the bending brace,to simulation of the brace buckling,and determined the simulation parameters as needed under the condition of static analysis: number of bar segment,the number of integration points and cross-section fiber.Determine the modeling method of finite element analysis software OpenSEES.Build geometric model by the software 3 d3 s,transform the command flow of model through pretreatment of OpenSEES software OpenSEES Navigator,and set up every parameter of the model in static analysis and dynamic analysis,provide an easy way of modeling for web shell model in OpenSEES analysis.We use OpenSEES to analysis the single-layer cylindrical reticulated shell,and determine the number segment what simulating bar buckling need by analysis dynamic stability ofsingle-layer cylindrical reticulated shell model with different section segment.Provide an effective and reasonable way of modeling and analysis for analyzing the initial bending effect the stability of the structure.Analyze the overall stability of single-layer spherical reticulated shell simply using every parameter decided,separately calculate the mode of initial bending and without initial bending,and analyze the two kinds of model calculation results,research the earthquake response of single-layer cylindrical reticulated shell.Results show that the bars in structure after initial bending enter into the plastic stage early,which agree with the static analysis results of single bar,but little impact on the whole seismic performance of structure.