Effects of Vertical Ground Motions on the Seismic Response of Isolated Structures with XY-Friction Pendulum System

Abstract eng:
The effects of vertical ground motions on the response of isolated structures with XY-Friction Pendulum (XY-FP) systems are investigated. The structure is idealized as a three-dimensional singlestory building resting on the XY-FP system. The response of this idealized system subjected to three components (including vertical component) and two components (excluding vertical component) of Tabas 1978 earthquake excitations is investigated. The variation of the base shear and bearing displacement under variation of important structure parameters such as superstructure period, isolation period and sliding coefficient of friction is studied. It is demonstrated that error caused by neglecting the vertical component of earthquake in determining the peak bearing displacement and base shear of the structure are 4 and 31 percent, respectively.

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