A variable stiffness hydraulic three-dimensional isolation for single-layer reticulated domes

摘要：

　　Base isolation has been recognized as a solution for enhanced functionality of important structures,and applications have grown significantly in the past three decades.To date,however,base isolation is mainly used to improve the horizontal behaviors of structures.The overturning behavior of the structure is one of the reasons preventing the development of three-dimensional isolation.For space frame structures,the vertical responses are usually comparable to the horizontal responses and there is a need to mitigate the vertical responses.Considering the large span of space frame structures,overturning behavior is less significant as in building structures,and therefore the three-dimensional isolation can be used.A novel variable stiffness hydraulic three-dimensional isolation(VSH3DI)device for single-layer reticulated domes is developed.The VSH3DI device is composed with a horizontal linear rubber bearing and a new developed vertical bearing combining hydraulic cylinders.Vertical sliders and connection elements are used to uncouple horizontal and vertical movements.The VSH3DI device can provide three-dimensional isolation capacity with isolation period more than 1 s in each direction,variable vertical stiffness for different loading stage,overturning behavior resisting capacity,and uncoupled movement in horizontal and vertical directions.A 90 m single-layer reticulated dome with the VSH3DI device is simulated using ABAQUS software.The performance of the structures with no isolations,traditional isolations and the VSH3DI device under different amplitudes of near-and far-fault earthquakes are compared.The results indicate that the performance of the single-layer reticulated dome is significantly improved with the VSH3DI device.The axial force,acceleration and reaction force responses of the structure are effectively reduced with the VSH3DI device,while the displacement response of the isolation layer is not larger than the traditional isolations.

关键词： variable stiffness three-dimensional isolation single-layer reticulated domes

作者: Zhaotao Chen Yundong Shi Yang Ding

作者单位: School of Civil Engineering,Tianjin University,Tianjin,China School of Civil Engineering,Tianjin University,Tianjin,China;Key Laboratory of Coastal Civil Enginee

会议类型: 国际会议

会议名称: The 7th World Conference on Structural Control and Monitoring(7WCSCM)(第七届结构控制与监测世界大会)

会议地点: 青岛

会议语种:英文

页码: 990-998

在线出版日期: 2018-07-22（万方平台首次上网日期，不代表论文的发表时间）