Seismic Response Analyses of the Yokohama Bay Cable-Stayed Bridge in the 2011 Great East Japan Earthquake
Publication: Journal of Bridge Engineering
Volume 19, Issue 8
Abstract
Yokohama Bay Bridge, with a total span length of 860 m, is the second longest span cable-stayed bridge in East Japan, and one of the most densely instrumented bridges in Japan. On March 11, 2011, the Great East Japan (Tohoku) Earthquake hit northeastern Japan with magnitude of 9.0, notably the largest earthquake in Japan’s modern history. Intensity of the maximum scale 7 of Japan Meteorogical Agency’s seismic intensity was recorded on the bridge site. This paper describes seismic response analyses of the bridge, system identification, performance evaluation of link-bearing connections (a seismic isolation system), and postearthquake field observation. Response analyses show that transverse vibration dominated the response of girder and tower, with a maximum girder displacement of 62 cm. The large transverse vibrations induced pounding between tower and girder on the tower–girder connections as shown by the periodic impulses on acceleration records. Meanwhile, longitudinal accelerations indicate that the link-bearing connections functioned properly during the earthquake. System identification reveals nonlinearity of the response as evidenced by variations in natural frequencies and mode shapes during large excitation. Despite these conditions, the bridge did not suffer any structural damages, since the ground motions experienced during the earthquake were less than the design and seismic retrofit ground motions.
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Acknowledgments
The authors gratefully acknowledge Metropolitan Expressway Public Corporation, Tokyo, Japan, for collaboration in this study and for access to the seismic monitoring system. Valuable discussion with Dr. Masaaki Yabe of Chodai Consulting Engineering is also highly appreciated.
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Published In
Journal of Bridge Engineering
Volume 19 • Issue 8 • August 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Sep 20, 2012
Accepted: May 9, 2013
Published online: May 11, 2013
Discussion open until: Jun 13, 2014
Published in print: Aug 1, 2014
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