The Research On Overall Stability Of Multi And Tall-layer Steel Structure Parking

With the development of social economy and the improvement of city modernization, vehichles in city suddenly increases, issue of transportation of static state of city town is very outstanding, whether problems of urban congestion and parking could be solved, has already become a key constrained factor which affects the urban construction and economic development. The automatic tridimensional garage is born in this grim situation.With the high-rise steel structure elevator-style tridimensional garage as the primary researchful object, it analyzes overall stability in detail; and investigates the continuous way, simplified design method for garage structure in this paper. The main contents of the thesis are listed as followed:At first, the stiffness matrix of spatial bar element in steel structure tridimensional garage is deduced from theory of finite deformation, the matrix includes the affections of shaft force Nx to the structure, it also contains the influences of shearing force Qy,Qz, torquemoment Mx, bending moment My,Mz, besides these, the effect due to shear deformation is considered in matrix too.The overall stability of garage structure is researched by using software ANSYS in full-course analysis. And the parameters analysis (such as, height to width aspect ratio, scantling, layout spaces of vertical braces and support lever, binomial coefficient of elementary unit in garage) are carried on in order to get the reasonable scopes of parameters of garage structure.Then, the high-rise steel structure tridimensional garage is equivalent to a cantilever mast which is bulit-in ground by simplified analysis method, the calculation of equivalent shear stiffness and bending stiffness of the structure are derived, and the formulas of the structural lateral displacement under different load patterns are developed. The ultimate load of unstability under the vertical load is deduced by using equivalent bending stiffness of the structure, a set of the calculations about the internal force are derived from inverse substitution of the formulas about the structural lateral displacementFinally, the precision of these formulas are obtained by comparing the results of lateral displacements, internal forces, ultimate load of stability which are calculated by these formulas in a couple of garage structures with ANSYS.