Research on performance of a novel periodic foundation considering damping effects
Sun Feifei1,2 Liu Yue2 Dai Xiaoxin2 Xiao Lei2
1. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;
2. College of Civil Engineering, Tongji University, Shanghai 200092, China
Abstract：Periodic structure can be used as periodic isolation foundation in the field of civil engineering because of its unique bandgap characteristics which can filter the vibration in the bandgap frequency range. In this work, a novel periodic foundation based on inertial amplification mechanism is proposed, and the attenuation domain of the periodic foundation is optimized so that it has better attenuation effect on the main frequency range of far-field ground motions. However, at the formant outside the attenuation domain, the periodic foundation has the defect of amplifying the response. At the same time, due to the randomness of ground motions, the response of the structure under some special earthquake records may be amplified. Therefore, the rotational viscous damper is introduced into the periodic foundation in order to overcome the above defects. Based on frequency response analysis and time history analysis, the influences of different stiffness ratios, mass ratios, off-angles, damping ratios and numbers of element on the attenuation domain of the periodic foundation are studied. The results show that the novel periodic foundation achieving good attenuation and robustness can reduce the peak response of the original structure by 39.6% ～ 69.2%, and has a significant effect on the 44 far-field ground motions taken in this study.
孙飞飞 刘越 戴晓欣 肖蕾. 考虑阻尼影响的新型周期性基础性能研究[J]. 土木工程学报, 2021, 54(7): 1-11， 42.
Sun Feifei Liu Yue Dai Xiaoxin Xiao Lei. Research on performance of a novel periodic foundation considering damping effects. 土木工程学报, 2021, 54(7): 1-11， 42.
