Seismic response analysis of single-degree-of-freedom yielding structures with fluidic self-centering systems

摘要

Analyses of single-degree-of-freedom yielding structures with fluidic self-centering systems are performed for a wide range-of parameters and the results are utilized to (a) illustrate the effect of the added fluidic self-centering devices on the behavior of the structural system, and (b) to arrive at conclusions on the appropriate strategy for selection of the structural system and self-centering system properties for design. The results suggest that the primary structural system could be designed for a base shear force not less than 75% of the minimum base shear force prescribed in ASCE 7-2010 for the building exclusive of the self-centering system, and that the drift criteria would be satisfied and the residual drift will be minimal when the fluidic self-centering system is designed for a preload equal to about (or more than) 20% of the story shear yield strength and a viscous damping ratio of at least 10% of critical under elastic frame conditions. Simplified methods of analysis are then presented and verified by comparison to non-linear response history analysis results. The simplified methods of analysis are found to be reasonably accurate for most practical cases of structural system and self-centering system parameters except for cases of long period structures and when near-fault, pulse-like ground motions are considered. (C) 2016 Elsevier Ltd. All rights reserved.