Numerical investigations of seismic responses of non-isolated and isolated double-layer cylindrical reticulated shells with substructure

The seismic performance of the spatial double-layer cylindrical reticulated shell was numerically simulated using the finite element program ABAQUS, based on the data obtained from the shaking table test. And the simulated natural frequency, acceleration response, and stress response of the model are compared with the test data. The results show that the numerical analysis of spatial double-layer cylindrical reticulated shells considering lower support can accurately simulate the test results. Due to the significant impact of model vibration and other flaws on the structural reaction and the data collecting system, the precision of the test under small-seismic conditions is lower than that under large-seismic conditions. Consequently, a numerical simulation is employed to study the collapse performance of the test model. The results show that the numerical simulation can accurately investigate the failure and collapse behavior of the structure. Additionally, a numerical simulation is conducted on the shaking table test of a spatial double-layer reticulated shell structure incorporating the new three-dimensional isolation bearing. The numerical simulation results are in good agreement with the test results. However, due to the complex mechanical properties of the new three-dimensional isolation bearing, the simulation accuracy of the isolation model is less than that of the non-isolation model. Finally, the numerical simulation results show that the isolation bearing can significantly improve the seismic performance of the structure and greatly increase the safety of this kind of structure by changing the first three modes of the structure and avoiding the predominant period. The analysis conclusion of this paper will provide a good reference for the seismic isolation research and engineering practice of spatial double-layer cylindrical reticulated shell structure.