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.
Proceedings Title: 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
Conference Dates: May 16-19, 2000
Conference Title: U.S.-Japan Cooperative Program in Natural Resources; Panel on Wind and Seismic Effects (UJNR)
Pub Type: Conferences
design codes, passive energy dissipation devices, seismic codes, structural control, supplemental dampers, viscous dampers