Abstract
This work presents the development and implementation of the Multiple Regression Analysis (MRA) model to Seismic-Isolation (SI) systems consisting of Natural Rubber Bearings and Viscous Fluid Dampers subject to Near-Field (NF) earthquake ground motion. A model representing a realistic five-story base-isolated building is used. Several damper properties are used in creating an array of feasible combinations for the SI system. Two ensembles of seven NF earthquake records are utilized representing two seismic hazard levels. The key response parameters investigated are the Total Maximum Displacement, the Peak Damper Force and the Top Story Acceleration Ratio of the isolated structure compared to the fixed-base structure. Mathematical models for the key response parameters are established via MRA. The MRA models produced acceptable results with significantly less computation. This is demonstrated via a practical example of how the MRA models would be incorporated in the design process, especially at the preliminary stages.
Highlights
Seismic-Isolation (SI) with and without supplemental damping for energy dissipation has proven to be an effective method of control for structures during seismic events
Many types of isolators exist commercially today, which are capable of supplying the system with significant added damping such as the HighDamping Rubber (HDR) bearings and Lead-Rubber Bearings (LRB)
Once supplemental damping is deemed necessary, many designers would prefer utilizing the linear behavior of Natural Rubber Bearings (NRBs) isolators combined with the supplemental damping provided by Viscous Fluid Dampers (VFDs); the use of such a system often results in additional uniformity to the story forces induced in the superstructure due to the reduced out-of-phase velocity and displacement peak responses
Summary
Seismic-Isolation (SI) with and without supplemental damping for energy dissipation has proven to be an effective method of control for structures during seismic events. Once supplemental damping is deemed necessary, many designers would prefer utilizing the linear behavior of NRB isolators combined with the supplemental damping provided by VFDs; the use of such a system often results in additional uniformity to the story forces induced in the superstructure due to the reduced out-of-phase velocity and displacement peak responses This system has been used in many projects in the USA and Japan (Hussain et al 1993; Hussain 1994; Hussain, Retamal 1994; Hussain, Al Satari 2007a, b, 2008; Al Satari, Abdalla 2009; AlHamaydeh, Hussain 2010; Kani, Nishikawa 2010). The most efficient system can later be selected based on the trade-off between minimizing the floor accelerations on one hand and minimizing the DTM and Vb on the other
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