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A Discussion on the Seismic Coefficient for Gravity Quay Wall Considering Frequency Characteristics of Input Earthquake

입력 지진의 주파수 특성을 고려한 중력식 안벽의 수평 지진계수에 대한 고찰

  • Lee, Moon Gyo (Department of Civil and Environmental Engineering, KAIST) ;
  • Ha, Jeong Gon (Department of Civil and Environmental Engineering, KAIST) ;
  • Park, Heon Joon (Department of Civil and Environmental Engineering, KAIST) ;
  • Kim, Dong Soo (Department of Civil and Environmental Engineering, KAIST)
  • 이문교 (KAIST, 건설 및 환경공학과) ;
  • 하정곤 (KAIST, 건설 및 환경공학과) ;
  • 박헌준 (KAIST, 건설 및 환경공학과) ;
  • 김동수 (KAIST, 건설 및 환경공학과)
  • Received : 2017.10.16
  • Accepted : 2017.12.08
  • Published : 2018.01.01

Abstract

Pseudo-static approach has been conventionally applied for the design of gravity type quay walls. In this method, seismic coefficient ($k_h$), expressed in terms of acceleration due to gravity, is used to convert the real dynamic behavior to an equivalent pseudo-static inertial force for seismic analysis and design. Therefore, the calculation of an appropriate $k_h$ considering frequency characteristics of input earthquake is critical for representing the real dynamic behavior. However, the definitions of $k_h$, which is used for simplified analysis in Korea, focuses only on convenience that is easy to use, and the frequency characteristics of input earthquake are not reflected in the $k_h$ definitions. This paper evaluates the influences of the frequency characteristics of input earthquake on $k_h$ by initially reviewing the $k_h$ definitions in the existing codes of Japan for port structures and then by performing a series of dynamic centrifuge tests on caisson gravity quay walls of different earthquake input motions (Ofunato, Hachinohe). A review of the existing codes and guidelines has shown that the $k_h$ values are differently estimated according to the frequency characteristics of input earthquake. On the other hand, based on the centrifuge tests, it was found that the permanent displacements of wall are more induced when long-period-dominant earthquake is applied.

Acknowledgement

Grant : 항만 및 어항설계기준 고도화를 위한 성능기반 내진설계 기술 개발

Supported by : 한국연구재단, 한국해양과학기술진흥원

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