DOI QR코드

DOI QR Code

Lateral Resistance of CLT Wall Panels Composed of Square Timber Larch Core and Plywood Cross Bands

  • JANG, Sang Sik (Department of Bio-based Materials, College of Agriculture & Life Sciences, Chungnam National University) ;
  • LEE, Hyoung Woo (Department of Bio-based Materials, College of Agriculture & Life Sciences, Chungnam National University)
  • Received : 2019.06.04
  • Accepted : 2019.07.20
  • Published : 2019.09.25

Abstract

Thinned, small larch logs have small diameters and no value-added final use, except as wood chips, pallets, or fuel wood, which are products with very low economic value; however, their mechanical strength is suitable for structural applications. In this study, small larch logs were sawed, dried, and cut into square timbers (with a $90mm{\times}90mm$ cross section) that were laterally glued to form core panels used to manufacture cross-laminated timber (CLT) wall panels. The surface and back of these core panels were covered with 12-mm-thick structural plywood panels, used as cross bands to obtain three-ply CLT wall panels. This attachment procedure was conducted in two different ways: gluing and pressing (CGCLT) or gluing and nailing (NGCLT). The size of the as-manufactured CLT panels was $1,220mm{\times}2,440mm$, the same as that of the plywood panels. The final wall panels were tested under lateral shear force in accordance with KS F 2154. As the lateral load resistance test required $2,440mm{\times}2,440mm$ specimens, two CLT wall panels had to be attached in parallel. In addition, the final CLT panels had tongued and grooved edges to allow parallel joints between adjacent pieces. For comparison, conventional light-frame timber shear walls and midply wall systems were also tested under the same conditions. Shear walls with edge nail spacing of 150 mm and 100 mm, the midply wall system, and the fabricated CGCLT and NGCLT wall panels exhibited maximum lateral resistances of 6.1 kN/m (100%), 9.7 kN/m (158%), 16.9 kN/m (274%), 29.6 kN/m (482%), and 35.8 kN/m (582%), respectively.

Keywords

CLT wall panel;lateral resistance;small square timber;plywood cross band

Acknowledgement

Supported by : Chungnam National University

References

  1. Blass, H.J., Fellmoser, P. 2004. Design of solid wood panels with cross layer. In: Lahti, Finland, Proceedings of the 8th World Conference on Timber Engineering (WCTE 2004) 2, pp.543-548.
  2. Dujic, B., Aicher, S., Zarnic, R. 2006. Testing of wooden wall panels applying realistic boundary conditions. In: Portland, USA, Proceedings of the 9th World Conference on Timber Engineering (WCTE 2006) 2, pp.1186-1193.
  3. Gagnon, S., Pirvu, C., ed. 2011. CLT Handbook, Canadian edition. FP innovations, Pubcation No. SP-528E, Quebec, Canada.
  4. Jang, S.S. 2012. Development of multi-layer glued members used for construction of Korean-style houses by utilizing thinned domestic small logs. Report submitted to Ministry for Food, Agriculture, Forestry and Fisheries, No. 11-1541000-001480-01.
  5. Jang, S.S. 2015. Improvement of structural performance of multi-layer glued members manufactured from domestic small timbers which are not used for high value-added products. Report submitted to Korea Forestry Service, No. 11-1400000-000688-01.
  6. Karacabeyli, E., Douglas, B., ed. 2013. CLT Handbook, U.S. edition. FP innovations, Pubcation No. SP-529E. Quebec, Canada.
  7. Korea Standard Association: Method of shear resistance test for light-frame wood shear walls. KS F 2154, 2006.
  8. Korea Standard Association: Structural glued laminated timber. KS F 3021, 2013.
  9. Korea Standard Association: Structural plywood. KS F 3113, 2016.
  10. Mestek, P., Kreuzinger, H., Winter, S. 2008. Design of cross laminated timber(CLT). In: Miyazaki, Japan, Proceeding of the 10th World Conference on Timber Engineering (WCTE 2008), pp. 61.
  11. Oh, J.K., Kim, G.C., Kim, K.M., Lee, J.J., Hong, J.P. 2017. End distance of single-shear screw connection in cross-laminated timber. Journal of the Korean Wood Science and Technology 45(6): 746-752.
  12. Pang, S.J., Kim, K.M., Park, S.H., Lee, S.J. 2017. Bending behavior of nailed-jointed cross-laminated timber loaded perpendicular to plane. Journal of the Korean Wood Science and Technology 45(6): 728-736.
  13. Song, Y.J., Hong, S.I. 2016. Evaluation of bonding strength of larch cross-laminated timber. Journal of the Korean Wood Science and Technology 44(4): 607-615. https://doi.org/10.5658/WOOD.2016.44.4.607