한국구조물진단유지관리공학회 논문집 (Journal of the Korea institute for structural maintenance and inspection)

  • 제28권5호
  • /
  • Pages.10-19
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  • 2024
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  • 2234-6937(pISSN)
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  • 2287-6979(eISSN)
한국구조물진단유지관리공학회 (Korea Institute for Structural Maintenance Inspection)
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세장판 복부를 갖는 H형 보의 파형 CFRP 패널을 이용한 최적 전단보강

Optimal Shear Strength Enhancement using Corrugated CFRP Panel for H beam with Slender Web

  • 박가윤 (서울과학기술대학교 건설시스템공학과) ;
  • 성민현 (서울과학기술대학교 건설시스템공학과) ;
  • 김진국 (서울과학기술대학교 건설시스템공학과)
  • 투고 : 2024.07.17
  • 심사 : 2024.08.12
  • 발행 : 2024.10.31
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초록

이 연구에서는 세장판 복부를 가진 H형 보를 보강하는 파형 CFRP 패널의 최적 설계를 목표로 하여 FEM 해석을 수행하였다. 파형 CFRP 패널의 다양한 제원에 따른 좌굴 보강성능을 평가하였으며, 특히 H형 보 복부의 순높이에 따른 수직보강재의 비율이 1차 탄성 좌굴모드의 위치에 미치는 영향을 분석하여 새로운 보강방법을 제안하였다. CFRP 사용량을 최소화하기 위해 부착 각도를 45도로 설정하였다. 나아가, 파형 CFRP 패널의 제원 변화에 따른 매개변수 해석을 수행하여 파형 CFRP 패널의 좌굴 보강성능을 연성지수를 통해 평가하였다. 또한 최대 하중 및 연성지수를 파형 CFRP 패널의 부피와 동시에 고려하여 재료를 효율적으로 사용하고자 하였다. CFRP 적층 수가 2개 또는 3개인 모델이 연성지수가 높고 재료가 효율적으로 사용된다는 것을 확인하였으며, 파형 CFRP 패널의 폭보다는 높이 및 길이에 따라 좌굴 보강성능이 지배적인 영향을 받는다는 것을 확인하였다.

In this study, FEM analysis was performed with the goal of optimal design of corrugated CFRP panels reinforcing H-shaped beams with slender plate webs. The buckling reinforcement performance of corrugated CFRP panels according to various specifications was evaluated, and in particular, a new reinforcement method was proposed by analyzing the effect of the ratio of vertical reinforcement according to the net height of the abdomen of the H-type beam on the location of the first elastic buckling mode. To minimize the amount of CFRP used, the attachment angle was set to 45 degrees. Furthermore, parameter analysis was performed according to changes in the specifications of the corrugated CFRP panel, and the buckling reinforcement performance of the corrugated CFRP panel was evaluated through the ductility factor. In addition, we attempted to use the material efficiently by simultaneously considering the maximum load and ductility factor along with the volume of the corrugated CFRP panels. It was confirmed that the model with two or three-layer CFRP laminate have a high ductility factor and efficient use of materials, and that the buckling reinforcement performance is predominantly affected by the length and height of the corrugated CFRP panel rather than the width.

키워드

과제정보

이 성과는 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임(No. 2022R1F1A1074002).

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