Response of Subsystems on Inelastic Structures

by Jon Lin, Univ of California, Berkeley, Berkeley, CA, USA,
Stephen A. Mahin, Univ of California, Berkeley, Berkeley, CA, USA,

Document Type: Proceeding Paper

Part of: Structural Engineering in Nuclear Facilities


Preliminary analyses are performed to obtain insight into the seismic response of subsystems supported on simple structures that yield during severe earthquake ground motions. Current design recommendations for subsystems accounting for yielding of the supporting structures are assessed and found to be unconservative. An amplification factor is defined to quantify the effects of inelastic deformations of the supporting structure on subsystem response. Design guidelines are formulated for predicting the amplification factor based on statistical evaluation of the results generated for ten earthquake ground motions. Using these values, design floor response spectra can be obtained from conventional linear elastic floor response spectra accounting for yielding of the supporting structure without having to perform inelastic analysis. The effects of non-zero subsystem mass are examined. The recommended amplification factors are found to be applicable even when the mass of subsystem approaches that of the supporting structure.

Subject Headings: Inelasticity | Floors | Response spectra | Linear analysis | Elastic analysis | Load and resistance factor design | Ground motion | Nuclear power

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