Design Method Of Sleeve Reinforcement For Compress Members Of Grid Structure

With the development of steel structures,the application of large-span space grid structures has become increasingly widespread.In the actual structural design process,the grid structures design method is often based on highly optimized design theory,and even the full stress design,so that in the actual use of the grid structure,often due to boundary conditions,use conditions and design input conditions,there is a deviation,resulting in the instability of the compress members in the grid structure causes insufficient structural bearing capacity.In severe cases,it even leads to structural collapse,resulting in significant casualties and property losses.Therefore,it is of great engineering significance to study the reinforcement of the grid structure.To this end,this paper makes the finite element parameters analysis about the reinforcement method of the compress members of the grid structure,and proposes relevant design suggestions based on the results of the finite element analysis.The main contents are as follows:1.Based on the research background of grid structure compress members reinforcement,the related methods of different reinforcement are expounded,the sleeve components are introduced,and the research at home and abroad is reviewed.The research direction and research content of this paper are clarified(Chapter 1).2.A numerical simulation method based on quasi-static analysis for compress members sleeve reinforcement was established.The existing test and test results were used as reference.The reliability of the analytical method was verified by comparing the results of the finite element method with the test results.sleeve reinforcement analysis provides support(Chapter 2).3.The simplified mechanical model of the compression sleeve member is proposed,and the finite element analysis model is established.The relevant design parameters are proposed and the calculation results are analyzed.The eigenvalue buckling analysis is carried out to get the first six-order buckling mode and eigenvalues of the inner tube.The nonlinear buckling analysis is used to obtain the bearing capacity of the inner tube considering the initial defect;for the differentlength and thickness sleeve reinforcement members and the experimental results of multi-segment reinforcement and sleeve-reinforced components with different bolt pre-tightening forces are summarized and analyzed.The study found that: a single-segment with a length of inner tube length of 60% and a thickness consistent with the inner tube,a pre-tightening sleeve Reinforcement,comprehensive stress,deformation and bearing capacity,the reinforcement effect is better,and more economical(Chapter 3).4.Based on the results analysis in Chapter 3 and the actual requirements of engineering implementation,the proposed values of relevant design parameters are proposed for single-segment sleeve reinforcement,and the reinforcement of 35.1m grid structure trestle of a cement plant is taken as an application case to analyze application effect of the relevant design parameters in the overall structure.By analyzing the load factor,structural stress and deformation before and after reinforcement,it is found that the sleeve reinforcement design is carried out under the suggested parameters of the sleeve reinforcement design method.After the reinforcement,the overall stress level of the structure decreases to a certain extent,the overall stiffness of the structure increases,and the overall deflection decreases.The overall structural stability is improved and the structural bearing capacity is increased.Overall,the reinforcement effect is better,and the effectiveness of the sleeve reinforcement and sleeve reinforcement design method is verified.Provide reference for future project implementation(Chapter 4).