Spectrum characterization of two types of long‐period ground motions and seismic behavior of frame‐core wall structures under multidimensional earthquake records

Summary With the wide application of long period such as high‐rise and super high‐rise buildings, long‐period ground movement can easily cause resonant effects and serious destructions on the long‐period structures. The Fourier amplitude spectrum and response spectrum of three translational components about typical and actually measured long‐period ground motions show that all three translational components exhibit the long‐period characterization and the dynamic behavior and seismic damage of high‐rise buildings subjected to multidimensional long‐period earthquake records urgently deserves further study. Then, the analytical method of numerical simulation was employed to establish the finite element model of a high‐rise frame‐core wall structure with the fundamental period of 2.64 s. And the suggested modeling techniques and the accuracy of the numerical method were verified. Furthermore, the nonlinear time history analysis on the reinforced concrete frame‐core wall structures subjected to multidimensional long‐period earthquake records was conducted, and the seismic behavior of the structure were studied. The analytical results show that the mutual interaction on strength and stiffness under 2‐D or 3‐D long‐period seismic action will obviously amplify the dynamic behavior and seismic damage of the structure. The distribution rule about the weakest story, the design focus of seismic defense line, the distribution rule of hysteretic energy and the characteristics of destructive mode can provide a theoretical basis for the seismic design of high‐rise structures subjected to long‐period earthquake records.