Development of a Friction PendulumBearing Base Isolation System for Earthquake Engineering Education Author : Nikolay Kravchuk , Ryan Colquhoun, and Ali Porbaha

WHAT IS THIS DOCUMENT ABOUT? : Base isolation systems have become a significant element of a structural system to enhance reliability during an earthquake. One type of base isolation system is Friction Pendulum Bearings in which the superstructure is isolated from the foundation using specially designed concave surfaces and bearings to allow sway under its own natural period during the seismic events. This study presents development of a base isolation system to physically demonstrate the concept of Friction Pendulum in the laboratory for earthquake engineering education. The responses of a single degree of freedom system with and without base isolation are measured simultaneously and compared for free and forced vibrations using the accelerometers attached to the top of the model structures. The results showed that the maximum acceleration experienced by the structure was 0.23g and 0.57g with and without base isolation, respectively, and the damping of the system increased about 5 times due to base isolation. The experimental tool developed here was implemented in an undergraduate course “Introduction to Earthquake Engineering”, and the results of student analyses are presented. Overall the base isolated system showed a significant improvement in dynamic response of the model structure by reducing the lateral acceleration and increasing the damping of the system.

Keywords	:	Friction Pendulum Base isolation earthquake angineering
file credit	:	Nikolay Kravchuk , Ryan Colquhoun, and Ali Porbaha
file type	:	pdf
file topic	:	Engineering
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file address	:	mase.wustl.edu/wusceel/ucist/publications/publications/Base%20isolation%20system_Ali.pdf

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