Abstract
Base isolation technology is a popular and powerful isolation technology. This technique can greatly reduce the seismic response of the structure, so as to reduce the damage to the structure. Base isolation method decouples the superstructure from the base by installing a flexible layer under each column to reduce dynamic response in the earthquake and elongate the time period of structures due to its inherent flexibility. However, the long time period causes large displacement. In addition, base isolation devices are highly vulnerable due to uplift forces produced by lateral force resisting systems (LFRS). In this study, an adjustable structure with a new configuration, namely double skin semi-base-isolated (SBI) structure is presented to solve the above problems. The LFRS is omitted in the proposed SBI structure and the time period and displacement are reduced compared to the conventional base-isolated structure. The forcedeformation behavior of an isolator is modeled as bi-linear hysteretic behavior which can be effectively used to model all isolation system in practice. This study investigates the seismic performance of 10-story double skin SBI reinforced concrete (RC) structure under far-fault earthquake ground motion by numerical method. Results demonstrate that the SBI system is significantly adjustable with the use of RC coupling beams between the inner core and outer frames. By increasing or reducing the number of connected floors in the SBI system, dynamic behaviors of the SBI system can be changed. The adjusted structure can be created by adding and removing RC coupling beams at every arbitrary floor level.
Highlights
Base isolation is a passive control technique that sued to separate the superstructure from the base with a low stiffness layer to transfer the fundamental frequency of structural vibration to a value lower than the frequencies of earthquake ground motions [1,2,3]
For the reason of some problems in the conventional isolated structure such as long time period, large displacement and eliminate entire lateral force resisting system that cause instability in isolation devises, this study introduced a double skin SBI structure
To investigate the seismic behavior of the double skin SBI structure, numerical analysis has been presented for estimating the seismic behavior of 10-story SBI structures subjected to 22 component pairs of far-fault bi-directional scaled ground motion, using incremental dynamic analysis based on the OpenSees program
Summary
Base isolation is a passive control technique that sued to separate the superstructure from the base with a low stiffness layer to transfer the fundamental frequency of structural vibration to a value lower than the frequencies of earthquake ground motions [1,2,3]. The aim of using base isolation devices is to lengthen the fundamental period of the structure by its inherent flexibility to reduce the transmission of energy from the ground [4, 5] This flexible layer is utilized to reduce the amount of force induced by the ground motions such as story accelerations, relative story drift, and story shear forces. Fu and Zhang [13] proposed an integrated control system to combine double-skin facade and mass dampers in buildings Their results indicated that mass damper systems can significantly reduce structural motions under earthquake excitation. RC coupling beams were utilized in the seismic gap distance between the inner core and outer skin to connect the story floor level to outer frames In this system to overcome the instability of the isolation devices, LFRS such as shear walls and bracings were completely transferred from inner core to the outer skin with fixedbase.
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