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Damping Ratios for Seismic Design of SC Structures  

Lee, Seung-Joon (아주대학교 건축학부)
Kim, Won-Ki (호서대학교 건축공학과)
Publication Information
Journal of Korean Society of Steel Construction / v.22, no.5, 2010 , pp. 487-496 More about this Journal
Abstract
The structural damping ratios for seismic design of nuclear power plant structures are specified in Regulatory guide 1.61 of the United States NRC for RC structures of 4%(OBE) and 7%(SSE), and for steel structures of 3%(OBE) and 4%(SSE), but not for steel-plate concrete (SC) structures that have been developed recently. The objective of this study is to investigate the damping ratios of SC structures by identifying the relative differences in the damping ratios between RC and SC structures. An experimental study was performed on four specimens, RC-S, RC-M, SC-S and SC-M, where S stands for shear-governed and M for moment-governed. The conducted method was free vibration testing by rupturing a brittle steel plate that linked the actuator and the mass center. The test results were analyzed to determine fundamental frequencies and damping ratios at various load levels. By examining the relative differences in damping ratios of four specimens, it is proposed for SC structures to use the same damping ratio of 4% as RC one at OBE, but 1% less damping ratio than RC one resulting in 6% at SSE.
Keywords
damping ratio; SC structure; nuclear structure; seismic design; free vibration test;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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