Fluid damper devices in civil structures such as buildings or bridges are commonly used as energy absorbers for seismic protection. The problem in the response analysis of structures with filleddampers mainly consists in the fact that, due to the strongly nonlinear behavior of such equipments, the response spectrum technique fails. Moreover, in order to enhance the damping effect varioustoggle brace configurations have been recently proposed. In this paper by using the concept of power spectral density function compatible with the elasticresponse spectrum and the stochastic linearization technique, the equivalent damping ratio is obtained. It is shown that once the system is linearized results obtained by Monte Carlo simulationand those obtained by stochastic analysis are in good agreement. Furthermore, various toggle brace configurations are analyzed in detail and compared with a new one here proposed. The analysis is performed by taking into account the inherent nonlinearities of the damper by means of stochastic analysis and validated by using time histories of recorded accelerograms and by the stochastic analysis using spectrum consistent power spectral density.
|Numero di pagine||16|
|Stato di pubblicazione||Published - 2008|