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Publication Citation: Design Procedures for Structures with Supplemental Dampers

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Author(s): Fahim Sadek; Michael A. Riley;
Title: Design Procedures for Structures with Supplemental Dampers
Published: April 01, 2001
Abstract: Passive energy dissipation devices are used to reduce the damage from earthquakes by absorbing a portion of the earthquake-induced energy in structures. Wide acceptance of these devices in structures will depend on the availability of simplified methods for their analysis and design. This study is concerned with: 1) investigating the effect of increased viscous damping on the seismic response of structures; 2) assessing the accuracy of the linear static and dynamic procedures recommended in the NEHRP Guidelines for the Seismic Rehabilitation of Buildings (FEMA 273) for the design of structures with velocity-dependent dampers; and 3) proposing modifications to the current procedures to improve their accuracy. Based on the analysis of several single-degree-of-freedom structures subjected to a large number of earthquake records, the study identifies two limitations of the FEMA 273 procedures: 1) the use of a constant reduction factor for the displacement response of short-period structures; 2) the assumption of a harmonic response to compute the peak velocity and the story and base shears. In most cases, these assumptions result in non-conservative estimates of the peak response and design forces. Comparisons of the methods proposed in this study and in FEMA 273 indicate that the former produces more accurate results.
Conference: U.S.-Japan Cooperative Program in Natural Resources; Panel on Wind and Seismic Effects (UJNR)
Proceedings: Wind and Seismic Effects, Joint Meeting | 32nd | Proceedings of the 32nd Joint Meeting of the U.S.-Japan Cooperative Program in Natural Resources; Panel on Wind and Seismic Effects | NIST
Dates: May 16-19, 2000
Keywords: design codes;passive energy dissipation devices;seismic codes;structural control;supplemental dampers;viscous dampers
Research Areas: Building and Fire Research