Experimental and numerical simulation on seismic failure of aluminum alloy reticulated shell

This study aims to analysis the dynamic characteristics and seismic collapse behavior of aluminum alloy reticulated shell structures especially pay attention to the failure mechanism in the failure stages. The collapse process of shell under strong seismic was studied by shaking table experiment, and the seismic response and collapse of structures were obtained. By establishing the finite element model of the shell, the internal force changes, collapse mechanism of the rod under seismic are analyzed. The seismic response differences of reticulated shells under different rise-span ratios and initial defects were analyzed. Then, the performance differences between aluminum alloy reticulated shells and steel reticulated shells in natural frequency and seismic response are compared. The results show that the vertical deformation of the reticulated shell is small before the collapse, which is mainly the rotation of the joint and the in-plane bending deformation of the rods. The frequency is not significantly reduced before and after the collapse, and the stiffness is still large after the failure. With the increase of the rise-span ratio, the collapse load decreases first and then increases. Considering the initial defects, the collapse load of the reticulated shell structure is significantly reduced. The natural vibration period of the aluminum alloy reticulated shell is larger than that of the steel reticulated shell.