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NIST Authors in Bold
|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|