Failure Behavior Of Arch-supported Reticulated Shell Based On Multi-dimension Damage Accumulation Effect And Study On A New Hollow Cylinder Joints

As the application of space structure, new type of hybrid structures and joints are proposed, which need deeper and more comprehensive research.Static behavior research on arch-supported reticulated shell has been finished by now, but nothing about its dynamic performance. Based on the definition of equivalent strain, the multi-axial damage model is introduced in this paper. The user material subroutine is compiled with ANSYS, which is tested to be applicable for the accurate finite element analysis of large structure. The summary of failure behavior is obtained by the time-history analysis under severe earthquake excitation. Meanwhile, compared with the results of bilinear kinematic hardening model, there is difference between the two material models. And then, a higher span ratio arch-supported reticulated shell under lower seismic incitation tends to dynamic strength failure, otherwise, tends to dynamic instability failure. Finally, it is found that small support stiffness tends to the decrease of the structure dynamic stability.A type of hollow cylinder joints are applied to connect with H-shaped beams in this paper, which are of more ductility and material economical than general welded hollow spherical joints. Based on the Von Mises yield criterion and perfect elastoplasticity, FEM is employed to find ultimate capacity subjecting axial force and bilateral moment respectively. A conclusion is obtained that the ultimate load of the joints determined by their maximum displacement. In the end, the FEA results are testified to be correct by a set of experiment, and simplified calculation formulas of the ultimate load are proposed according to FEA results and numerical fitting. This new type of hollow cylinder joints will be helpful for the components connections of spatial reticulated structures.