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Proceedings of the International Conference on
Advances and New Challenges in Earthquake
Engineering Research, Hong Kong Volume
3Qg
PROGRESS IN THE SEISMIC DESIGN AND RETROFIT OF
BRIDGES IN KOREA, A MODERATE SEISMICITY REGION
Jae Kwan KIM ! , Ick Hyun KIM 2 , Gui-Hyun JUHN 3 and Dae Yeon CHO 4
1 Associate Professor, Department of Civil, Urban and Geosystem Engineering,
Seoul National University, Kwanak-ku, Seoul, 151-742, Korea
E-mail: jkwankim@plaza.snu.ac.kr
2 Assisstant Professor, Department of Civil and Environmental Engineering,
University of Ulsan, Ulsan, 680-749, Korea
3 Research & Development Division, Korea Infrastructure Safety & Technology Corporation,
Ilsan-ku, Koyang, Kyounggi-do, 411-410, Korea
4 REITs and Venture Team, Research Center, Korea Highway Corporation,
Seongnam, Kyounggi-do, 461-703, Korea
ABSTRACT: New performance-based seismic design concept had been developed in 1997 and
included in 2000 edition of Korea Highway Bridge Standards. The limited ductility design approach
appropriate to Korea is under active development. In this year the manual for the seismic assessment
of highway bridges was drafted and approved. The manual for retrofit will be drafted and published
soon. Because it is required by law, many old bridges will be retrofitted in near future. In this seismic
assessment manual a new philosophy is introduced in the determination of design earthquake for
retrofit of bridges. In this paper, this new concept is introduced briefly. In addition the Korean efforts
in the seismic design and retrofit of highway bridges are briefly reported.
INTRODUCTION
Even though Korea is located rather far away from the active plate boundary many historic records and
recent seismic activities indicate Korea belongs to a region of moderate seismicity. In spite of seismic
hazard the earthquake resistant design was introduced to Korea for the first time in 1992 for highway
bridges. But the energetic study and research to develop new seismic design concept has been
activated since the 1995 Kobe earthquake. As a result performance-based design concept was
developed in 1997 and included in 2000 edition of Korea Highway Bridge Standard partially. The
details of this standard are basically similar to those of the AASHTO code of USA. However the
seismic response characteristics of structures in moderate seismicity regions has not been fully taken
into account in the present code. It is clearly recognized that the limited ductility design will be
appropriate in the moderate seismicity regions. Currently research efforts are under progress to
develop the details for the implementation of limited ductility design for the highway bridges. In this
paper the research progress and design details of landmark bridges is reported.