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Structural Performance of Joints for Partial Reinforced Beam Using GFRP Laminated Plate and Cylindrical Reinforced LVL Column

GFRP적층판을 활용한 보강보부재와 원통형 단판적층기둥재 접합부의 내력 성능평가

  • Song, Yo-Jin (Department of Forest Biomaterials Engineering, College of Forest and Environmental Sciences, Kangwon National University) ;
  • Jung, Hong-Ju (Department of Forest Biomaterials Engineering, College of Forest and Environmental Sciences, Kangwon National University) ;
  • Lee, Jung-Jae (Department of Forest Biomaterials Engineering, College of Forest and Environmental Sciences, Kangwon National University) ;
  • Suh, Jin-Suk (Dept. of Forest Products, Korea Forest Research Institute) ;
  • Park, Sang-Bum (Dept. of Forest Products, Korea Forest Research Institute) ;
  • Hong, Soon-Il (Department of Forest Biomaterials Engineering, College of Forest and Environmental Sciences, Kangwon National University)
  • 송요진 (강원대학교 산림환경과학대학 산림바이오소재공학과) ;
  • 정홍주 (강원대학교 산림환경과학대학 산림바이오소재공학과) ;
  • 이정재 (강원대학교 산림환경과학대학 산림바이오소재공학과) ;
  • 서진석 (국립산림과학원 임산공학부) ;
  • 박상범 (국립산림과학원 임산공학부) ;
  • 홍순일 (강원대학교 산림환경과학대학 산림바이오소재공학과)
  • Received : 2014.02.04
  • Accepted : 2014.02.26
  • Published : 2014.05.25

Abstract

After being laminated with a combination of glass fiber reinforced plastic and plywood, the GFRP laminated plate was densificated for 1 hour at $150^{\circ}C$ with pressure of $1.96N/mm^2$. A partial reinforced beam was produced by attaching the 5 GFRP laminated plates to the joint of glulam and the column. In addition, the column to beam joint was produced by using reinforced laminated wooden pin which was made of GFRP sheet and plywood, fiber glass reinforced cylindrical-LVL column. The joint was made of round log, glulam and drift pin as the reference specimen, and its moment resistance was evaluated. As a result, the strength performance of specimens with partial reinforced beams were 1.8 times stronger than the reference specimen on average. Furthermore, rupture was neither occurred on partial reinforced beam nor column. Toughness and stiffness of joints were also fine. The GFRP sheet reinforced laminated plate showed better reinforcement effect than GFRP textile reinforced one. GFRP sheet was inserted into each layer of laminate, and it showed good condition in rotation-angle and strength, therefore it is the most appropriate to reinforce the part of the beam.

합판과 유리섬유강화플라스틱을 조합하여 적층 후 $1.96N/mm^2$의 압력으로 $150^{\circ}C$에서 1시간 고밀화시킨 유리섬유 강화플라스틱 적층판을 제작하였다. 제작된 5가지의 유리섬유강화플라스틱 적층판을 각각 기둥재와 접하는 집성재에 부착하여 부분보강보부재를 제작하였다. 더불어 합판과 시트형 유리섬유강화플라스틱을 적층한 보강적층목재핀과 유리섬유로 보강한 원통형 단판적층기둥재로 기둥-보 접합부를 제작하였다. 기준시험편으로는 원주목과 집성재로 제작한 보부재, 드리프트핀을 사용한 접합부를 제작하여 모멘트 저항 내력을 평가하였다. 시험결과 기준시험편과 비교하여 부분보강보부재를 사용한 시험체들이 평균 1.8배 높은 내력성능이 측정되었다. 모든 부분보강보부재와 원통형 단판적층기둥재에는 파단이 발생하지 않았으며 접합부의 인성과 강성이 모두 양호하게 측정되었다. 부분보강보부재의 보강효과는 시트형 유리섬유강화플라스틱이 직물형 유리섬유강화플라스틱으로 보강한 적층판보다 양호한 보강효과를 보였으며, 시트형 유리섬유강화플라스틱을 각층에 삽입한 적층판이 접합내력과 변형각 모두 양호하여 보부재의 부분보강에 적합한 것을 확인하였다.

Keywords

References

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Cited by

  1. Bending Strength Performance Evaluation of Glass Fiber Cloth Reinforced Cylindrical Laminated Veneer Lumber vol.44, pp.3, 2016, https://doi.org/10.5658/WOOD.2016.44.3.415