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GFRP보강적층목재핀의 휨강도 및 인장형 전단내력 성능평가

Performance Evaluation for Bending Strength and Tensile Type Shear Strength of GFRP Reinforced Laminated Wooden Pin

  • 송요진 (강원대학교 산림환경과학대학 산림바이오소재공학과) ;
  • 정홍주 (강원대학교 산림환경과학대학 산림바이오소재공학과) ;
  • 김대길 (강원대학교 산림환경과학대학 산림바이오소재공학과) ;
  • 김상일 (강원대학교 산림환경과학대학 산림바이오소재공학과) ;
  • 홍순일 (강원대학교 산림환경과학대학 산림바이오소재공학과)
  • 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) ;
  • Kim, Dae-Gil (Department of Forest Biomaterials Engineering, College of Forest and Environmental Sciences, Kangwon National University) ;
  • Kim, Sang-Il (Department of Forest Biomaterials Engineering, College of Forest and Environmental Sciences, Kangwon National University) ;
  • Hong, Soon-Il (Department of Forest Biomaterials Engineering, College of Forest and Environmental Sciences, Kangwon National University)
  • 투고 : 2014.02.04
  • 심사 : 2014.02.21
  • 발행 : 2014.05.25

초록

목구조물 접합부에 기존 드리프트핀(Drift pin)을 대체하고자 단판이나 합판을 유리섬유강화플라스틱(GFRP: Glass fiber reinforced plastic)과 복합 적층시킨 GFRP보강적층목재핀을 제작하였다. 더불어 GFRP보강적층목재핀을 사용하여 집성재 접합부의 인장형 전단내력 시험을 실시하였다. GFRP 배열에 따른 보강적층목재핀의 휨강도 시험결과 GFRP를 각층에 1장씩 삽입한 시험편(Type-A)이 가장 양호한 성능을 발휘하였다. 또한 압체압력 $1.96N/mm^2$, 온도 $150^{\circ}C$에서 한 시간 열압하여 고밀화한 시험편이 고밀화하지 않은 시험편과 비교하여 휨강도 성능이 1.57배 향상됨을 확인하였으며, 하중방향에 따라 Edgewise가 Flatwise보다 3.51배 높은 성능을 발휘하였다. 시험을 통해 가장 양호한 성능을 보인 Type-A 보강적층목재핀을 이용하여 전단내력 시험을 실시하였다. 접합구의 종류와 접합판의 종류를 달리하여 시험한 결과 드리프트핀과 강판을 적용한 시험체(Type-DS)와 비교하여 GFRP보강적층목재핀과 GFRP보강목재적층판을 적용한 시험체(Type-WL)가 1.12배 높은 전단내력이 측정되었으며 최대하중 이후에도 매우 양호한 인성이 관찰되었다.

By replacing the previous metal connector on the joints of timber structure, the GFRP reinforced laminated wooden pin was produced using a wooden material and Glass fiber reinforced plastic(GFRP) composite laminate. In addition, using the reinforced wooden pin, the tensile type shear strength test was conducted. Based on the result of the bending strength test of the reinforced laminated wooden pin according to the GFRP arrangement, a specimen(Type-A) with a single insertion of GFRP for each layer have shown the most favorable performance. Also, it was verified that densified specimen hot pressed for an hour at the temperature of $150^{\circ}C$ and with the oppression pressure $1.96N/mm^2$ have shown the improved performance of 1.57 times than the specimen without the densification. And in the bending strength test considering the load direction, edgewise have shown a higher performance of 3.51 times than the flatwise. A shear strength test was conducted using the Type-A reinforced laminated wooden pin which have shown a moderate performance on the test. Based on the test conducted by differentiating the type of the joint plate and the connector, compared to the specimen(Type-DS) applied with the drift pin and steel plate, the specimen( Type-WL) applied with the GFRP reinforced laminated wooden pin and GFRP reinforced wooden laminated plate have shown 1.12 times higher shear strength and also have shown an excellent toughness even after the maximum load.

키워드

참고문헌

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피인용 문헌

  1. Evaluation of The Moment Resistance Joint Strength of Larch Glulam Using Glass Fiber Reinforced Wood Plate vol.42, pp.5, 2014, https://doi.org/10.5658/WOOD.2014.42.5.571
  2. Interfacial and Mechanical properties of Different Heat Treated Wood and Evaluation of Bonding Property between Stone and Wood for Rock Bed vol.16, pp.2, 2015, https://doi.org/10.17702/jai.2015.16.2.69