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2023 Vol.33, Issue 4 Preview Page

Research Article

Analytical Verification of Seismic Reinforcement Effect of Port Breakwater during Earthquake

지진시 항만 방파제의 내진보강 성능에 관한 해석적 검증

Yihyuk Kwon1
,
Hyeok Seo2
,
Daehyeon Kim3*
권 이혁1
,
서 혁2
,
김 대현3*
1Graduated Student, Department of Civil Engineering, Chosun University
2Postdoctoral Researcher, Department of Civil Engineering, Chosun University
3Professor, Department of Civil Engineering, Chosun University
1조선대학교 토목공학과 박사과정
2조선대학교 토목공학과 박사후연구원
3조선대학교 토목공학과 교수
*Corresponding Author
31 December 2023. pp. 657-671
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Abstract

As large-scale earthquakes have occurred in Korea and their aftermath continues to be felt, laws and regulations on seismic design have been emphasized, and in Korea, the seismic design standards have been newly revised after the Gyeongju earthquake. In the revised seismic design standards, a stability review for the destruction of the support activity of the breakwater was newly added. Therefore, in this study, we conducted a stability analysis on the seismic reinforcement method for the study site, and checked the ground acceleration of the subgrade and the displacement of the structure over time. As a result of the stability analysis, the safety factor increased by at least 0.5 and up to 1.7. As a result of the time history analysis, the displacement of the superstructure decreased by up to 290 mm and down to 12 mm in both the shallow and deep sections before and after reinforcement, and the ground acceleration decreased by up to 5.33 m/s and down to 0.31 m/s after reinforcement.

Keywords
post breakwater
numerical analysis
safety factor
soft ground
seismic design

국내에 대규모 지진이 발생하고 그로인한 여파가 지속됨에 따라 내진설계에 대한 법령이 강조되어 국내의 경우 경주지진 이후 내진설계기준이 새롭게 개정되었다. 개정된 내진 설계기준에서는 방파제의 원호활동파괴에 대한 안정성 검토가 새롭게 추가되었다. 이에 본 연구에서는 내진보강공법이 반영된 연구대상지반에 대하여 원호활동 파괴에 대한 안정성 검토를 수행하였으며, 시간이력에 따른 하부지반의 지반가속도와 구조물의 변위를 확인하고자 하였다. 원호활동 안정성 검토 결과, 안전율이 최소 0.5~최대 1.7이상 증가하였다. 시간이력해석 결과, 얕은구간과 깊은구간에서 모두 보강전ㆍ후에 따른 상부구조물의 변위 값이 최대 290 mm~최소 12 mm까지 감소하였으며, 지반가속도의 경우 보강 후 최대 5.33 m/s~최소 0.31 m/s까지 감소하는 경향을 확인하였다.

키워드
방파제
수치해석
안전율
연약지반
내진설계
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 33
  • No :4
  • Pages :657-671
  • Received Date : 2023-10-19
  • Revised Date : 2023-12-18
  • Accepted Date : 2023-12-21
  • DOI :https://doi.org/10.9720/kseg.2023.4.657
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