Revised Seismic Intensity Parameters for Middle-Field Horizontal and Rocking Strong Ground Motions
Publication: Journal of Structural Engineering
Volume 143, Issue 1
Abstract
This paper presents a new method for determining rocking ground motion considering the effects of both time delay and loss of coherency in spatially variable seismic ground motions. Acceleration, velocity, and displacement response spectra resulting from the rocking component are also derived. Next, new seismic intensity parameters are proposed to estimate the combined action of the middle-field horizontal and rocking motions on the earthquake excitation of structures. These seismic intensity parameters are revised forms of the widely used ones for characterizing translational components, namely, peak ground velocity, peak ground displacement, cumulative absolute displacement, acceleration response spectrum, acceleration spectrum intensity, Fajfar intensity, and Kappos spectrum intensity. In addition, an expression for the estimation of the effect of the base tilt due to the rocking ground motion on the structural response is presented. The main advantage of the proposed relations is that they can be easily used to evaluate the approximate effect of the rocking component on the seismic excitation of structures.
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Acknowledgments
This study was supported in part by the U.S. National Science Foundation under Grants No. CMMI-0900179 and CMMI-1129396. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the U.S. National Science Foundation.
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© 2016 American Society of Civil Engineers.
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Received: Dec 27, 2015
Accepted: Jul 14, 2016
Published online: Aug 22, 2016
Published in print: Jan 1, 2017
Discussion open until: Jan 22, 2017
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