Linear procedures for structures with velocity-dependent dampers

Citation
F. Sadek et al., Linear procedures for structures with velocity-dependent dampers, J STRUC ENG, 126(8), 2000, pp. 887-895
Citations number
9
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Civil Engineering
Journal title
JOURNAL OF STRUCTURAL ENGINEERING-ASCE
ISSN journal
0733-9445 → ACNP
Volume
126
Issue
8
Year of publication
2000
Pages
887 - 895
Database
ISI
SICI code
0733-9445(200008)126:8<887:LPFSWV>2.0.ZU;2-L
Abstract
Passive energy dissipation devices are used to reduce the damage from earth quakes by absorbing a portion of the earthquake-induced energy in structure s. Wide acceptance of these devices in structures will depend on the availa bility of simplified methods for their analysis and design. The objectives of this study are to (1) investigate the effect of increased viscous dampin g on the seismic response of structures; (2) assess the accuracy of the lin ear static and linear dynamic procedures recommended in the NEHRP Guideline s for the Seismic Rehabilitation of Buildings (FEMA 273) for design of stru ctures with velocity-dependent passive energy dissipation devices; and (3) propose modifications to the current design procedures to improve their acc uracy. Based on the analysis of single-degree-of-freedom structures subject ed to a large number of earthquake records, the study identifies the follow ing limitations of the FEMA 273 procedures: (1) The use of a constant reduc tion factor for the displacement response of short-period structures; and ( 2) the assumption of a harmonic response to compute the peak velocity as we ll as the story and base shears. In many cases, these assumptions result in nonconservative estimates of the peak response and base shear. Comparisons of the results using the methods proposed in this study and in FEMA 273 wi th time-history analyses for several single- and multi-degree-of-freedom st ructures indicate that the proposed procedures give more accurate results.