본 연구는 ASTM D2718의 5점 휨하중 시험법을 사용하여 OSB(oriented strand board)와 국산합판의 굴림전단성능을 평가하기 위하여 수행되었다. 각 시험용 판넬에 대해 길이방향에 평행한 것과 수직인 시험편을 제작하여 각각 시험하였으며, 파괴양상을 관찰하였다. 시험 결과 굴림전단력은 강축방향에 평행한 경우 $1.32-1.938N/mm^2$, 강축방향에 수직인 경우 $1.46-1.99N/mm^2$ 정도로 나타났으며 방향에 따른 차이는 크게 나타나지 않았다. 국산합판은 길이방향에 평행한 경우는 캐나다산 OSB와, 수직인 경우는 칠레산 OSB와 통계적으로 차이가 나타나지 않았다. 파괴는 OSB에서는 모두 전단에 의한 파괴가 나타났으며, 합판의 경우에는 전단, 접착층의 박리, 휨과 전단에 의한 복합파괴가 관찰되었다.
본 연구는 ASTM D2718의 5점 휨하중 시험법을 사용하여 OSB(oriented strand board)와 국산합판의 굴림전단성능을 평가하기 위하여 수행되었다. 각 시험용 판넬에 대해 길이방향에 평행한 것과 수직인 시험편을 제작하여 각각 시험하였으며, 파괴양상을 관찰하였다. 시험 결과 굴림전단력은 강축방향에 평행한 경우 $1.32-1.938N/mm^2$, 강축방향에 수직인 경우 $1.46-1.99N/mm^2$ 정도로 나타났으며 방향에 따른 차이는 크게 나타나지 않았다. 국산합판은 길이방향에 평행한 경우는 캐나다산 OSB와, 수직인 경우는 칠레산 OSB와 통계적으로 차이가 나타나지 않았다. 파괴는 OSB에서는 모두 전단에 의한 파괴가 나타났으며, 합판의 경우에는 전단, 접착층의 박리, 휨과 전단에 의한 복합파괴가 관찰되었다.
This study was conducted to evaluate the planar (rolling) shear strength of OSB (oriented strand board) panels and domestic plywood through 5 point bending test method in ASTM D2718 standard. The test specimens were prepared in parallel and perpendicular direction to major axis (along the length of ...
This study was conducted to evaluate the planar (rolling) shear strength of OSB (oriented strand board) panels and domestic plywood through 5 point bending test method in ASTM D2718 standard. The test specimens were prepared in parallel and perpendicular direction to major axis (along the length of panels) and tested up to failure, and failure modes were also examined. From the test results, rolling shear strength were found to be $1.32{\sim}1.94N/mm^2$ in parallel to major axis, and $1.46{\sim}1.99N/mm^2$ in perpendicular to major axis respectively. Little difference was found between parallel and perpendicular direction of rolling shear strength. There were no statistically significant differences in rolling shear strength between Canadian OSB and domestic plywood in the parallel direction, and between Chilean OSB and domestic plywood in the perpendicular direction. The shear failure was observed in all tested OSB panels, whereas shear failure, glue line delamination, and bending combined with shear failure were observed in the domestic plywood.
This study was conducted to evaluate the planar (rolling) shear strength of OSB (oriented strand board) panels and domestic plywood through 5 point bending test method in ASTM D2718 standard. The test specimens were prepared in parallel and perpendicular direction to major axis (along the length of panels) and tested up to failure, and failure modes were also examined. From the test results, rolling shear strength were found to be $1.32{\sim}1.94N/mm^2$ in parallel to major axis, and $1.46{\sim}1.99N/mm^2$ in perpendicular to major axis respectively. Little difference was found between parallel and perpendicular direction of rolling shear strength. There were no statistically significant differences in rolling shear strength between Canadian OSB and domestic plywood in the parallel direction, and between Chilean OSB and domestic plywood in the perpendicular direction. The shear failure was observed in all tested OSB panels, whereas shear failure, glue line delamination, and bending combined with shear failure were observed in the domestic plywood.
* AI 자동 식별 결과로 적합하지 않은 문장이 있을 수 있으니, 이용에 유의하시기 바랍니다.
제안 방법
In this study, the 5-point bending test was applied to the OSB and domestic plywood which are widely used in the wood construction site, and the rolling shear force was measured to conduct a comparative study on their performance.
대상 데이터
The test specimens parallel to the longitudinal direction from each structural panel had the dimensions of thickness × width × length = 11 (plywood: 12) × 120 × 400 mm, while the test specimens perpendicular to the longitudinal direction had thickness × width × length = 11 × 120 × 290 mm (plywood: 12). Five test specimens were cut and randomly selected from each panel, a total of 15 test specimens were prepared in each type of panel. The specimens were conditioned at 20℃, 65% relative humidity for about 10 days before testing.
The structural panels used in this study were four kinds, 1 domestic plywood and 3 imported OSBs, imported from Europe, Canada and Chile, respectively, and purchased from professional companies to be used as test materials. Table 1 shows the thickness, density and moisture content of specimens from each structural panel of 4 × 8 size.
데이터처리
ANOVA test and Duncan's multiple test for data analysis were performed using SPSS statistical program to verify the statistical difference for each measured value.
The significant difference between rolling shear strength of the panels was first verified by ANOVA test and then Duncan's multiple test was conducted.
이론/모형
The 5-point bending test method of ASTM D 2718 was used to determine the rolling shear force of imported OSBs and domestic plywood, which are currently used as typical cover materials in wood construction, and the results are analyzed.
The direct shear performance test method for structural panels is ASTM D2718. In this test method, the 5-point bending load test method is widely used since it is simple and economical, and the shear performance can be directly measured through it (Thomas, 2004; Nadir and Jerrold, 2007).
성능/효과
No statistically significant difference was observed between the domestic plywood and the Canadian OSB, which was statistically verified to have the same shear performance when parallel to the longitudinal direction, and the Chilean OSB, which was statistically verified to have the same shear performance when perpendicular to the longitudinal direction. Therefore, it is considered that it is possible to yield the allowable stress of the same level as those of the two structural panels.
The findings show that when parallel to the main axis, the highest shear force was 1.19 N/mm² for Chilean OSB, and 1.67 N/mm² for Canadian OSB, 1.71 N/mm² for plywood, and 1.32 N/mm² for European OSB which is the lowest value, respectively.
참고문헌 (13)
American Society for Testing and Materials. 2000. Standard Test Methods for Structural Panels in Planar Shear (Rolling Shear). ASTM D 2718. ASTM, West Conshohocken, Pa.
Bradtmueller, J.P., Hunt, M.O., Fridley, K.J., Mccabe. G.P. 1997. Mechanical properties of OSB via the five-point bending test. Forest Products Journal 47(9): 70-77.
Fridley, F., French, L. 2000. Five-point bending test for determination of edgewise shear in strructural panels. Forest Products Journal 50(5): 43-46.
Kim, W.C., Dharan, C.K.H. 1995. Analysis of five-point bending for determination of the interlaminar shear strength of unidirectional composite materials. Composite Structures. 30(3): 241-251.
Ministry of Land, Infrastructure, and Transport. 2017. MOLIT Statistics system - Statistics of housing construction (construction consent) - Housing construction records.
Nadir, A., Jerrold, E.W. 2007. Effects of various fire-retardants on plate shear and five-point bending shear properties of plywood. Forest Products Journal 57(4): 44-49.
Oh, S.C. 2013. Withdrawal and Lateral Resistance of Nail Joints Composed of Dimension Lumber and OSB in Light-Frame Wood Construction. Journal of the Korean Wood Science and Technology 41(3): 211-220.
Oh, S.C. 2013. Determining Shear Modulus of 3-ply Laminated Veneer Lumber by Uniaxial Tension Test. Journal of the Korean Wood Science and Technology 41(5): 425-431.
Shrestha, D. 1999. Shear properties tests of oriented strandboard panels. Forest Products Journal 49(10): 41-46.
Sretenovic, A., Gindl, W., Muller, U. 2005. Comparison of the in-plane shear strength of OSB and plywood using five point bending and EN 789 steel plate test methods. Holz als Roh-und Werkstoff 63(2): 160-164.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.