Study on motion analysis of pendulum isolation systems during earthquakes

摘要

After the Hanshin-Awaji Earthquake Disaster, the number of earthquake isolated buildings is increasing. Most of the base isolated buildings or structures are built on laminated rubber bearings in order to give them certain natural peridos. This situation, howeve,r also encourages structural engineers to research and develop non-rubber-type isolation systems ushc as linear motion bearing isolators and friction pendulum systmes. it is considered that the non-rubber type isolation systems cna be applied to important industrial facilities, such as LNG tanks, boiler facilities and so on to refine the seismic reliabilities of them. When using non-rubber-type isolation systems in the open air circumstances, long term durability of the systems must be taken into account and it may be very difficult to maintain the conefficient of friction of the system. In this study, dynamic motion of the isolated structure mounted on four of Friction Pendulum Bearing (FPB) systems is investigated, using an in-plane analytical model, considering a variance of coefficent of friction of each FRB system, a distribution of the mass of superstructures and so on.