NEHRP Clearinghouse
- Title
- New Floor Response Spectrum Method for Seismic Analysis of Multiply Supported Secondary Systems.
- File
- PB84239417.pdf
- Author(s)
- Asfura, A.; Der Kiureghian, A.
- Source
- National Science Foundation, Washington, DC.; Electric Power Research Inst., Palo Alto, CA., June 1984, 130 p.
- Identifying Number(s)
- UCB/EERC-84/04
- Abstract
- The method defines and utilizes an extension of the conventional floor response spectrum denoted cross-oscillator, cross-floor response spectrum (CCFS). The CCFS is defined to be proportional to the covariance of the responses of two fictitious oscillators subjected to the motions of the primary system at two support points. Through this extended concept, important effects not accounted for in the current floor-spectrum methods, are correctly included in the analysis. These effects include: cross-correlations between motions of the support points, cross-correlations between modal responses of the secondary system, interaction between primary and secondary systems, resonance or tuning between the frequencies of the two subsystems and the non-classical damping effect of the combined primary-secondary system.
- Keywords
- Supports; Seismic waves; Vibration; Damping; Spectrum analysis; Earthquake engineering; Resonance; Motion; Dynamic structural analysis