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Dynamic Response Analysis of Irregular Story Isolation Structures under Near-field Earthquake Conditions

LI Hui1,2,BAO Chao2,DU Yong-feng1,2 (1.Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education,Lanzhou Univ.of Tech.,Lanzhou,Gansu 730050, China;2.Institute of Earthquake Protection and Disaster Mitigation,Lanzhou Univ.of Tech.,Lanzhou,Gansu 730050,China)  
As a new form of isolation,the story isolation structure not only can reduce the dynamic response of upper structures but also can make up for the deficiency of foundation isolation structures.The existing literature mostly analyzes the regulated story isolation structures in far-field earthquakes.In this paper,an eight-story house with a podium-reinforced concrete frame story isolation structure,a foundation isolation structure,and a seismic structure are simulated by using SAP2000.The dynamic responses of the three structures in near-field earthquake conditions are compared.The results show that the whiplash effect is different in the top stories of the three structures in the near-field conditions.However,compared with the seismic structure,the other two kinds of isolated structures show very good damping behavior.In addition,the damping properties of the foundation isolation structure are better than the story isolation structure.Therefore,structures with a podium should be strengthened at the top of the podium.
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