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CLT와 Ply-lam에서 층재 직교에 의한 withdrawal resistance 보강 효과
방성준 ( Sung-jun Pang ),안경선 ( Kyung-sun Ahn ),이현정 ( Hyeon-jeong Lee ),양승민 ( Seung Min Yang ),강석구 ( Seog Goo Kang ),오정권 ( Jung-kwon Oh ) 한국목재공학회 2019 한국목재공학회 학술발표논문집 Vol.2019 No.2
In this study, withdrawal resistances of self-tapping screws (STS) in cross-laminated timber (CLT) and Ply-lam, a hybrid CLT made by plywood and structural timber, were investigated. The withdrawal resistances of STS were predicted by design formulas in Korean Building Code, National Design Specification, and Eurocode 5. To predict the withdrawal resistances of CLT and Ply-lam, withdrawal resistances of STS in solid wood and plywood were also tested and predicted by the design formulas. The results showed that the withdrawal resistances of STS in plywood were about two time higher than those in solid wood. The withdrawal resistances of STS in CLT were similar to those in Ply-lam. These results indicate that the withdrawal resistances of STS in plywood, CLT, and Ply-lam were reinforced by an adjacent lamina in cross layer.
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방성준 ( Sung-jun Pang ),안경선 ( Kyung-sun Ahn ),박금성 ( Keum-sung Park ),김현수 ( Hyun Soo Kim ),오정권 ( Jung-kwon Oh ) 한국목재공학회 2020 한국목재공학회 학술발표논문집 Vol.2020 No.1
In this study, the shear capacity of notch connection was investigated to design the CLT-concrete composite floor. The notch connection was composed of cross-laminated timber (CLT) and eco-concrete. Two types of the notch connection with different diameters were manufactured to evaluate the shear capacity according to the area of the notch. The size of CLT was 300 mm × 400 mm, and a 20 mm deep hole (∅100 mm or ∅200 mm) was drilled in the center of the surface. Eco-concrete was poured on the CLT with a thickness of 50 mm. The planar shear test was conducted with an inclination of 11.6 degrees, and the load rate was 2 mm/min. As a result, shear failure of concrete occurred for ∅100 mm notch connection. The load resistance was 16.5 kN (lower 5<sup>th</sup> percentile value) and the slip modulus was 50.8 kN/mm (mean value). In case of ∅100 mm notch connection, shear block failure of CLT occurred. The load resistance was 59.6 kN (lower 5<sup>th</sup> percentile value) and the slip modulus was 75.7 kN/mm (mean value).
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물리적 처리에 따른 낙엽송 방부원주목의 표면할렬 방지효과
방성준 ( Sung-jun Pang ),오정권 ( Jung-kwon Oh ),이상준 ( Sang-joon Lee ),박준호 ( Jun-ho Park ),장성일 ( Sung-il Jang ),이전제 ( Jun-jae Lee ) 한국목재공학회 2017 목재공학 Vol.45 No.1
In this study, the surface check reduction effect of preservative-treated Korean larch round-wood was investigated by applying three physical treatments, such as incising, kerfing, and kiln-drying. Moreover, the possibility of long- term service life was also checked by comparing the depth of surface check and the penetration depth of preservative. A rapid gradient of wood moisture content between surface and center causes a surface check. Thus, the effect of reducing surface check was carried out at the lowest equilibrium moisture content (EMC) condition, temperature (2℃), humidity (44.6%), in outdoor locations in Korea until the test specimens reach to the 8.6% EMC. As a result, the preservative- treated specimens without incising, kerfing, kiln-drying (Type C) could not ensure the long-term service life due to a large surface check. Because the surface check depth of all specimens was deeper than the penetration depth of preservative. In case of the incising treated specimens (Type I), 80% of them, the depth of surface check was not deeper than the penetration depth of preservative. However, when a kerfing was additionally treated (Type B), a possibility of happening deeper surface check than penetration depth of preservative was increased rather than Type I.
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낙엽송 집성재 Glued-in-rod 접합부의 인장성능
방성준 ( Sung-jun Pang ),안경선 ( Kyung-sun Ahn ),김지용 ( Ji Yong Kim ),이한식 ( Han Shik Lee ),오정권 ( Jung-kwon Oh ) 한국목재공학회 2021 한국목재공학회 학술발표논문집 Vol.2021 No.1
In this study, the tensile stiffness and strength of glued-in-rod connections were investigated. A hole (ø20×300mm) was drilled on the cross-section of larch glulam (moisture content: 10%). A steel bar (ø16×500mm) was inserted 300mm into the hole of the glulam. The gap between the hole of glulam and the steel bar was filled with epoxy. Six specimens were prepared and the tensile test was evaluated with UTM (100kN, Zwick) by KS F ISO 9087. The test speed was 3mm/min and a Linear Variable Differential Transformer (LVDT) was installed between the glulam and steel bar. Five of the six specimens were not failed at the maximum capacity of the UTM, and one specimen (No. 3) was destroyed at 89.3kN. When the steel bar was pulled out, the load decreased sharply, and the epoxy and wood were attached around the steel bar. The tensile stiffness was a range of 41.7 kN/mm ~ 54.1 kN/mm, and the average value was 45.8 kN/mm. The tensile strength was 0.3 kN/mm (91.5kN/300mm).
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방성준 ( Sung-jun Pang ),안경선 ( Kyung-sun Ahn ),김지용 ( Ji-yong Kim ),김민정 ( Min-jeong Kim ),오정권 ( Jung-kwon Oh ) 한국목재공학회 2021 한국목재공학회 학술발표논문집 Vol.2021 No.2
In the era of Carbon neutral, tall timber structures have been expanding to the urban building in the world. In Korea, the timber structures have been concentrated on light-frame construction and there are almost no timber buildings with a span of 10m or longer. Glued-laminated timber (GLT) is manufactured by a combination of laminae so the structural performance can be predicted by the properties of the lamina in the layers. The grades and combinations of GLT lamina differ from country to country. In this study, a prediction model for domestic GLT and hybrid GLT was investigated and a hybrid GLT reinforced with steel on the tensile or compressive side of GLT was analyzed to find out the optimal combinations.
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방성준 ( Sung Jun Pang ),오정권 ( Jung Kwon Oh ),박천영 ( Chun Young Park ),박주생 ( Joo Saeng Park ),박문재 ( Mun Jae Park ),이전제 ( Jun Jae Lee ) 한국목재공학회 2011 목재공학 Vol.39 No.1
Recently, the visual grading rule of Korea Forest Research Institute(KFRI) was revised and it is necessary to investigate the distribution characteristics of visual graded lumber in accordance with the revised rule. Therefore, in this study, the distribution characteristics of bending strength was investigated with revised visual grading rule and changed prior rule, respectively. The size of specimens was 38×140×3,000(mm) and the species were Larix kaempferi and Pinus koraiensis. The moisture content was under 18% and the specimens were tested in accordance with ASTM D-198. The number of No.1 and 2 grades, suitable for structural lumber, was increased when the revised visual grading rule was applied. Moreover, the revised rule was more effective to distinguish sharply between No.1 and 2 grades and below No.3 grade. Meanwhile, the lower 5% exclusion limit and allowable stresses were generally decreased when revised visual grading rule had been applied. However, the announcement of Korea Forest Service, tested with small clear specimen, was much lower than the allowable stresses of this test, tested with structural lumber. Therefore, the revision of allowable design values should be considered for more exact use and effective structural design.
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방성준 ( Sung-jun Pang ),안경선 ( Kyung-sun Ahn ),김지용 ( Ji-yong Kim ),오재원 ( Jae-won Oh ),오정권 ( Jung-kwon Oh ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.1
In this study, a glued-laminated timber (GLT) was reinforced with a steel plate and inclined screws, and its bending performance was analyzed. In a total of 8 GLTs, 3 GLTs were not reinforced (control group) and 5 GLTs were reinforced with steel plates (comparison group). The size of GLT was 80 mm (width) × 120 mm (thickness) × 2400 mm (length). The GLT in the comparison group, a steel plate (SPHC-P, yield strength: 227 MPa, modulus of elasticity 166.33 GPa) was installed with screws (∅9x160mm, 45°). The deflection and load of specimens were measured by a third-point bending test to derive their bending stiffness and load-carrying capacities. As a result of the experiment, all specimens in the control group showed brittle tensile failure, but all specimens of the comparison group showed ductile behavior and maintained a load-bearing capacity of about 30 kN. After the compression failure of the GLT, there was no damage to the screw connection while the steel plate was extended. Therefore, the screw connection sufficiently supported the shear force generated between GLT and steel plate, and the steel plate reinforcement completely changed the GLT behavior.
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방성준 ( Sung-jun Pang ),이한식,안경선 ( Kyung-sun Ahn ),김지용 ( Ji-yong Kim ),오재원 ( Jae-won Oh ),오정권 ( Jung-kwon Oh ),( Kyung Min ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.1
In this study, particleboard shear walls were developed and the lateral load-carrying capacities were evaluated. Seven types of specimens were manufactured by varying the wood species, the stud size, the number of particleboards, and the manufacturing method (glue or nail). (1) Load-carrying capacities of the glued-produced specimens were 71.5~75.9 kN/m. These were about 3 times higher than the typical light-frame shear wall and higher than the experimental data of the CLT wall in the CLT handbook. This would be due to the difference in the structural capacity of the used hold-downs. (2) All the specimens were failed at the hold-down and angle bracket, and no damage at the glue layer between a particleboard and wood studs. (3) Load-carrying capacity of the nail-produced specimen was about 20% lower than the glue-produced specimens. The capacities of glue-produced specimens with various combinations, species, stud size, and the number of particleboards, were not significantly different.
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