Study on nonlinear overall stability of single-layer elliptical paraboloid gridshell structure

Taking a single-layer elliptical parabolic grid shell with a span of 30 m× 30 m with practical engineering significance as the research object, the nonlinear overall stability performance of the grid shell was systematically analyzed by ABAQUS finite element program, and the influence of vector span ratio, initial geometric defects, constraints and other factors on the stability of the grid shell was considered. The buckling mode and buckling path of the grid shell were investigated, the whole process curve and ultimate stable bearing capacity were obtained, and the regularity of the overall nonlinear instability of the single-layer elliptical parabolic grid shell was comprehensively understood. The results show that the ultimate bearing capacity of the mesh shell gradually increases with the increase of the sagittal span ratio of the structure. It is sensitive to the asymmetric distribution and initial geometric defects of vertical loads, and the buckling load in the half-span vertical direction is only 70% of the full-span vertical load. The increase of the stiffness of the support can appropriately increase the ultimate bearing capacity of the grid shell.