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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 102
PROCEEDINGS OF THE FOURTEENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING
Edited by: B.H.V. Topping and P. Iványi
Paper 85

Evaluation of the Seismic Performance of a Highway Bridge considering the Subsidiary Fracture of the Rubber Bearings

T. Mazda1, C. Joon-Ho2 and T. Nishimura1

1Department of Civil and Environmental Engineering
Faculty of Engineering, Kumamoto University, Japan
2Department of Civil Engineering, Faculty of Engineering
Kyushu University, Japan

Full Bibliographic Reference for this paper
T. Mazda, C. Joon-Ho, T. Nishimura, "Evaluation of the Seismic Performance of a Highway Bridge considering the Subsidiary Fracture of the Rubber Bearings", in B.H.V. Topping, P. Iványi, (Editors), "Proceedings of the Fourteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 85, 2013. doi:10.4203/ccp.102.85
Keywords: dynamic response analysis, time history, fracture, rubber bearing, plate girder bridge, earthquake.

Summary
The 2011 earthquake off the Pacific coast of Tohoku occurred on March 11th. Several natural rubber bearings of the viaduct in the Tohoku district were fractured due to this earthquake. This type of damage was the first experienced in Japan. In this research, a three span continuous plate girder bridge with reinforced concrete piers was selected as a structure for examination. Natural rubber bearings were set up on the top of each pier. A fracture model of the natural rubber bearing was proposed in this research. Dynamic response analysis of the highway bridge considering the hardening and the fracture of the natural rubber bearing was conducted using TDAP III. The observed record of the nearest point to the damaged highway bridge in Sendai was selected as seismic input motion. From the results of the dynamic response analysis of the highway bridge, an increase of relative displacement in the natural rubber bearing, depending on the fractured bearing was confirmed in a longitudinal direction. The possibility of a fracture progress of the natural rubber bearing was verified. The relative displacement of the natural rubber bearing in the transversal direction was confirmed, the rotational motion of the girder occurred after the fracture of natural rubber bearings. From these results, the response of the highway bridge considering hardening and fracture of the natural rubber bearing was determined.

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