Estimation of inelastic displacement ratio for base-isolated structures

2017 ◽  
Vol 47 (3) ◽  
pp. 634-659 ◽  
Author(s):  
Saman Yaghmaei-Sabegh ◽  
Sina Safari ◽  
Karim Abdolmohammad Ghayouri
Keyword(s):  
Inelastic Displacement ◽  
Displacement Ratio ◽  
Isolated Structures ◽  
Inelastic Displacement Ratio

Prestressed concrete wall system with friction devices: Seismic performance and direct displacement–based seismic design

2021 ◽  
pp. 136943322110427
Author(s):  
Gang Xu ◽  
Tong Guo ◽  
Aiqun Li
Keyword(s):  
Seismic Design ◽  
Prestressed Concrete ◽  
Relative Strength ◽  
Concrete Wall ◽  
Residual Displacement ◽  
Inelastic Displacement ◽  
Displacement Ratio ◽  
Displacement Based ◽  
Inelastic Displacement Ratio ◽  
Wall System

It is convenient to use the inelastic displacement ratio spectra and residual displacement ratio spectra to predict the maximum inelastic displacement and residual displacement of building structures based on linear elastic analysis directly. The prestressed concrete wall system with friction devices (PCW-FD system) can be simulated by single-degree-of-freedom (SDOF) model with self-centering behavior. To investigate the seismic performance of PCW-FD system, the SDOF models with fully and non-fully self-centering behavior are analyzed firstly, and it is concluded that the hysteresis parameters (strength reduction coefficient, post-yield stiffness coefficient, energy dissipation coefficient, and period) have significant influence on the seismic responses (such as constant relative strength inelastic displacement ratio, constant relative strength residual displacement ratio, maximum absolute acceleration, the hysteretic energy, and site classifications) during short period, and the trends of the seismic responses are similar at different site classifications. Then a large amount of the result data is summarized, and the constant relative strength inelastic displacement ratio spectra and the constant relative strength residual displacement ratio spectra with enough precision (the correlation coefficients are 0.957 and 0.947, respectively) are established by conducting regression analysis. Finally, the direct displacement–based seismic design method is improved and verified to be suitable for PCW-FD system.

scholarly journals Functional Model to Estimate the Inelastic Displacement Ratio

2017 ◽  
Vol 13 (4) ◽  
pp. 1-11
Author(s):  
Vlad Ceangu ◽  
Dan Cretu
Keyword(s):  
Seismic Response ◽  
Functional Model ◽  
Degree Of Freedom ◽  
Similar Frequency ◽  
Single Degree Of Freedom ◽  
Inelastic Displacement ◽  
Single Degree ◽  
Ductility Factor ◽  
Displacement Ratio ◽  
Inelastic Displacement Ratio

Abstract In this paper a functional model to estimate the inelastic displacement ratio as a function of the ductility factor is presented. The coefficients of the functional model are approximated using nonlinear regression. The used data is in the form of computed displacement for an inelastic single degree of freedom system with a fixed ductility factor. The inelastic seismic response spectra of constant ductility factors are used for generating data. A method for selecting ground-motions that have similar frequency content to that of the ones picked for the comparison is presented. The variability of the seismic response of nonlinear single degree of freedom systems with different hysteretic behavior is presented.

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