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

JANG, Sang Sik; LEE, Hyoung Woo

doi:10.5658/wood.2019.47.5.547

[국내논문] Lateral Resistance of CLT Wall Panels Composed of Square Timber Larch Core and Plywood Cross Bands 원문보기

목재공학 = Journal of the Korean wood science and technology, v.47 no.5, 2019년, pp.547 - 556

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)

Abstract ▼ AI-Helper

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.

주제어

표/그림 (17)

그림 Fig. 1. Sawing method for small logs to produce small square timbers.
그림 Fig. 2. CLT wall panel with T&G edge.
그림 Fig. 3. Nailing patterns for NGCLT specimen.
그림 Fig. 4. Making parallel T&G joints between the adjacent CLT wall panels.
그림 Fig. 5. Standard single MP shear wall.
그림 Fig. 6. Testing method for lateral-load resistance of wall panels as given in KS F 2154.
그림 Fig. 7. Quasi-static cyclic load function applied to lateral resistance tests of CLT wall panels.
그림 Fig. 10. Load-displacement diagram obtained from lateral-load resistance test for MP specimen.
그림 Fig. 8. Load-displacement diagram obtained from lateral-load resistance test for S150 specimen.
그림 Fig. 9. Load-displacement diagram obtained from lateral-load resistance test for S100 specimen.
그림 Fig. 11. Load-displacement diagram obtained from lateral-load resistance test for CGCLT specimen.
그림 Fig. 12. Load-displacement diagram obtained from lateral-load resistance test for NGCLT specimen.
그림 Fig. 13. Comparison of the load-displacement diagrams for S150, MP, CGCLT and NGCLT specimens.
그림 Fig. 14. Envelop curve obtained from the loaddisplacement diagram for S150 specimen.
그림 Fig. 15. Envelop curve obtained from the loaddisplacement diagram for MP specimen.
그림 Fig. 16. Envelop curve of compression part, tension part and their average for each of three loading steps for NGCLT specimen.
표 Table 1. Results of lateral-load resistance tests for wall panel specimens

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제안 방법

In this study, larch small square timbers were edge glued together to form core panel for CLT manufacturing, and 12 mm thick plywood panels were used as cross bands by covering the surface and the back of core panel. The plywood was attached to the surface and the back by two method including gluing and pressing, and gluing and nailing.
In this study, straight small larch logs were selected, sawed, dried and finished to produce square timbers with 90 mm × 90 mm cross section, which were glued laterally to form core panels used to manufacture CLT wall panels.
The pressure required to make a strong bonding was applied by two method. The first method was application of 1 MPa of pressure for 2 hours, which produced the specimen named CGCLT. The second method was nailing of 8d nails with 150 mm spacing along the edge and 300 mm spacing in the field, which produced the specimen named NGCLT.

대상 데이터

S150 specimen was constructed with 38 mm × 89 mm dimension lumber framing with 406 mm spacing, 11.1 mm thick OSB as sheathing, and nailing of 8d nails with 150 mm edge nail spacing and 300 mm field nail spacing.
Small square timbers were glued together laterally to form 1,220 mm × 2,440 mm panels, which were used as cores for CLT wall panels.

이론/모형

The lateral-load resistance tests were performed in accordance with KS F 2154. To investigate the lateral resistance of CLT wall panels under horizontal loads the testing method given in KS F 2154 was applied as shown in Fig.
The lateral-load resistance tests were performed in accordance with KS F 2154. To investigate the lateral resistance of CLT wall panels under horizontal loads the testing method given in KS F 2154 was applied as shown in Fig. 5. During the tests, displacement was measured at three point including bottom at both ends and top right-hand side.

참고문헌 (13)

Design of solid wood panels with cross layer Blass 543 2004
Testing of wooden wall panels applying realistic boundary conditions Dujic 1186 2006
CLT Handbook, Canadian edition Gagnon 2011
Jang S.S. 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 2012
Jang S.S. 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 2015
CLT Handbook, U.S. edition Karacabeyli 2013
Method of shear resistance test for light-frame wood shear walls. KS F 2154 Korea Standard Association 2006
Structural glued laminated timber. KS F 3021 Korea Standard Association 2013
Structural plywood. KS F 3113 Korea Standard Association 2016
Design of cross laminated timber(CLT) Mestek 61 2008
Journal of the Korean Wood Science and Technology Oh 45 6 746 2017 10.5658/WOOD.2017.45.6.746 End distance of single-shear screw connection in cross-laminated timber

원문보기 상세보기
Journal of the Korean Wood Science and Technology Pang 45 6 728 2017 10.5658/WOOD.2017.45.6.728 Bending behavior of nailed-jointed cross-laminated timber loaded perpendicular to plane

원문보기 상세보기
Journal of the Korean Wood Science and Technology Song 44 4 607 2016 10.5658/WOOD.2016.44.4.607 Evaluation of bonding strength of larch cross-laminated timber

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