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JDR Vol.12 No.6 pp. 1215-1225
doi: 10.20965/jdr.2017.p1215
(2017)

Paper:

Duration of Strong Motion Exceeding Bridge Design Spectra in the 2016 Kumamoto Earthquake

Nobuoto Nojima*,† and Taiki Yamamoto**

*Department of Civil Engineering, Gifu University
1-1 Yanagido, Gifu 501-1193, Japan

Corresponding author

**Graduate School of Natural Science and Technology, Gifu University, Gifu, Japan

Received:
December 27, 2016
Accepted:
October 2, 2017
Online released:
November 29, 2017
Published:
December 1, 2017
Keywords:
strong motion duration, velocity response, bridge specification, design spectra, the 2016 Kumamoto Earthquakes
Abstract

The duration of strong motion exceeding the bridge design spectra in the bridge design specification in Japan is evaluated for the 2016 Kumamoto Earthquake. The structural response duration is defined as the total threshold interval of the velocity response envelope calculated for a viscously damped (5%) single-degree-of-freedom oscillator with various natural period. The prescribed design spectra are employed as frequency-dependent thresholds. The ground acceleration records observed at the K-NET and KiK-net stations during the Kumamoto earthquake are used for the analysis. Spectrum representations of the duration and number of cycles are obtained for four representative ground motion observation stations. The distribution maps of the duration are also presented for the strong motion observation stations in the Kumamoto prefecture.

Cite this article as:
N. Nojima and T. Yamamoto, “Duration of Strong Motion Exceeding Bridge Design Spectra in the 2016 Kumamoto Earthquake,” J. Disaster Res., Vol.12, No.6, pp. 1215-1225, 2017.
Data files:
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Last updated on Aug. 19, 2018