Seismic Response Analysis Of Dissipative Damping Structure Based On CANNY Program

Structural vibration control technology has been more widely used in the field of disaster prevention and mitigation in China. The method of evaluating the vibration attenuation and energy dissipation effect of structural passive control technology is always a key issue in the field of earthquake engineering and civil engineering. In this paper, a three-dimensional nonlinear structural analysis program (CANNY) is utilized to analyze comparatively the seismic response of concrete frame structure before and after setting up passive energy dissipation devices. From which, the energy distribution characteristics and the time of plastic hinges in frame structures under the earthquake are investigated, and the transference of the seismic input energy in the frame structures is analyzed. The main contents and conclusions are as follows:①CANNY program and its multi-spring model are used to establish the finite element analysis model of a two-storey single-span reinforced concrete frame structure. The top-floor displacement response of the frame model under different intensity earthquakes is analyzed and compared with the pseudo-dynamic test results. The results show that the maximum difference between the calculation and the experimental values of the peak displacement in top-floor is about4%, which verify the reasonableness of the model builded in this paper. It also could be found that the calculated top-level peak displacement of the frame model decreases from30%to60%after setting metallic dampers, which is consistent with the test results.②A six-story three-span concrete frame structure, which is simulated with CANNY program, is selected as an example to analyze the seismic response of structures under the influence of the spectral characteristics, the ground motion amplitude and the damping ratio. The distribution characteristics of total seismic input energy and structural hysteretic energy are also studied in this paper, and the appearing time of plastic hinges is obtained to analyze the transfer process of structural energy. The results show that the structural hysteretic energy and total seismic input energy ratio decreases with the increase of damping ratio under the rare earthquakes; the interlaminar distribution rule of structural hysteretic energy is consistent with that of beam hysteretic energy, and the value of column hysteretic energy decreases from the bottom to the top. In addition, the structure energy dissipated depends on the plastic deformation of columns early in the earthquake, however, with the development of structural nonlinear, the beams will play a dominant role on energy consumption. ③The study of the influence of metal energy dissipation device to the structural earthquake response is developed in this paper. Through the dynamic elastic-plastic time-history analysis of a reinforced concrete frame structure with metallic dampers, we can find that the top-level peak displacement of the frame and the maximum displacement angle between layers decrease from10%to15%owing to the metallic dampers, and the hysteretic energy of the structure was reduced by about50%. It also turns out that setting dampers could reduce the difference between each layer’s hysteretic energy, while the distribution rule of structural hysteretic energy between layers is basically unchanged. Additionally, with metallic dampers in frame, the number of plastic hinges is decreased and the appearing time of plastic hinges is delayed.Through the dynamic elastic-plastic time-history analysis of a reinforced concrete frame structure with metal energy dissipation device, the influence of the metal dampers on structural energy distribution characteristics, the appearance order of plastic hinges and the transfer process of energy are studied, which provide foundation for performance-based design of dissipative damping structures.