Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
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Comparative Analysis of Fire Resistance in Glued Laminated Timber: The Impact of Adhesives and Surface Direction

구조용 집성재의 접착제 종류 및 접착면 방향성에 따른 내화성능 비교 분석

  • Choi, Yun-Jeong (Department of Construction Test & Certification Center, Korea Institute of Civil Engineering and Building Technology) ;
  • An, Jae-Hong (Department of Construction Test & Certification Center, Korea Institute of Civil Engineering and Building Technology) ;
  • Baik, Kwon-hyuk (Department of Construction Test & Certification Center, Korea Institute of Civil Engineering and Building Technology)
  • Received : 2023.10.30
  • Accepted : 2023.12.12
  • Published : 2023.12.20
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Abstract

The fire resistance design of timber structures involves calculating the residual section based on charring depth, which is then utilized in structural design. Charring depth is determined from fire-resistance test results in Korea, which currently do not account for the charring properties of the adhesive used in Glued Laminated Timber(GLT) production. This study fabricated GLT using various adhesives employed in domestic GLT production, comparing the charring properties by adhesive type and the fire resistance performance relative to the directionality of the laminated surface. Melamine demonstrated the most advantageous fire resistance performance, followed by resorcinol and polyurethane. Furthermore, it was established that the laminated section exhibited a higher charring rate, influenced by the adhesive, compared to the laminated surface, which significantly impacts the fire resistance performance.

목구조 내화설계는 탄화두께를 이용하여 설계에 반영할 잔존단면을 산정하여 구조설계에 반영한다. 유럽이나 미국에서는 목재의 특성에 따라 탄화두께를 제시하여 적용하고 있으며, 국내에서는 내화시험을 통해 탄화두께를 산출하고 있다. 본 연구에서는 국내 구조용 집성재에 사용되고 있는 접착제별로 구조용 집성재를 제작하여 접착제 종류에 따른 탄화특성과 접착면의 방향성에 따라 내화성능에 미치는 영향을 비교하였다. 집성재 집성 시 사용되는 접착제중 멜라민이 내화성능에 가장 유리한 것으로 나타났으며, 다음으로 레소시놀, 폴리우레탄 순이었다. 또한 적층면보다는 적층단면이 접착제의 영향으로 인해 탄화속도가 커서 내화성능에 더 많은 영향을 주는 것으로 확인되었다.

Keywords

Acknowledgement

This study was carried out with the support of 'R&D Program for Forest Science Technology(Project No. 2023496A00-2325-AA02)' provided by Korea Forest Service(Korea Forestry Promotion Institute).

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