NEHRP Clearinghouse
 Title
 Linear Static and Dynamic Procedures for Structures with VelocityDependent Supplemental Dampers.
 File

PB99139859.pdf
 Author(s)
 Sadek, F.; Mohraz, B.; Riley, M. A.
 Source

May 1999,
60 p.
 Identifying Number(s)
 NISTIR6329
 Abstract
 The objectives of this study are: (1) to investigate the effect of increased viscous damping on the seismic response of structures; (2) to assess the accuracy of the linear static (LSP) and linear dynamic (LDP) procedures recommended in the NEHRP Guidelines for the Seismic Rehabilitation of Buildings (FEMA 273) for design of structures with velocitydependent passive energy dissipation devices; and (3) to propose modifications to the current design procedures to improve their accuracy and reliability. The study also identifies the following limitations of the FEMA 273 procedures: (1) the use of a constant reduction factor for the displacement response of shortperiod structures; (2) the assumption of a harmonic response to compute the peak velocity; and (3) the computation of design forces based on the assumption that the structure undergoes a harmonic motion with an amplitude equal to the peak displacement and a frequency equal to that of the fundamental mode.
 Keywords
 Passive systems; Static response; Earthquake resistance; Building codes; Design analysis; Performance evaluation; Dynamic structural analysis; Structural vibration; Vibration damping; Dampers; Structural response; Seismic effects; Degrees of freedom; Linearity; Energy dissipation