Implications of Friction Coefficient Variation in the Seismic Analysis of Structures With Triple Friction Pendulum Systems (Fpt). An Application Case

Abstract eng:
The earthquake at Pedernales in April 16 2016, of magnitude 7.8, caused too much damage in the structures of the provinces of Manabi and Esmeraldas in Ecuador, and marked the beginning of a new way of construction using passive control systems, such as seismic isolators or energy dissipators. At Universidad de las Fuerzas Armadas ESPE, located in the Valley of Los Chillos in Ecuador, five structural blocks with triple friction pendulum seismic isolators are being built. This paper describes the results of tests conducted to 61 isolators of this construction project, subjected to vertical loads of 250 tonf. In each test, three load cycles were applied at a rate of 12 seconds each, with a maximum amplitude of 30 cm. The friction coefficients obtained in each cycle and in each isolator were recorded. On this basis, three sets of data for the coefficient of friction of the plates of the isolation system were selected: one data base with maximum values, other with minimum values and another with nominal values. With these values, a seismic analysis was performed on the ESPE structural blocks using the simplified analysis model in ASCE 7, the Mc Vitty and Constantinou (2015) three-stages model and the Fenz and Constantinou (2007) five-stages model. The results are compared in terms of displacements and forces. Finally, the force and displacement results were compared at each level of friction coefficients: maximum, minimum and nominal values.

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