목재의 허용성질의 측정 및 수정

장상식 ( Sang Sik Jang ) 한국목재공학회 1989 목재공학 Vol.17 No.2

장부치수에 다른 장부결합부의 강도 및 강성도 변화

장상식(Sang Sik Jang) 한국가구학회 1994 한국가구학회지 Vol.5 No.2

To Investigate the effect of tenon dimension and using adhesive and wedge on the strength and stiffness of tenon-and-mortise joints, strength tests were performed with specimens having various length, height and width of tenon. The results obtained were summarized as follows:<br/> 1. Load-carrying capacity of tenon-and-mortise joints increased as the length, height and width of tenon increased. Among these three factors, the effect of length increase was greatest.<br/> 2. Tenon-and-mortise joints showed joint modulus of the level of 10-5 rad/kgf' cm for all dimensions used in this study when adhesive was used, which means very stiff joints.<br/> 3. Joint modulus of tenon-and-mortise joints decreased as length, height and width of tenon increased, and these effects were evident when the length of tenon was short.<br/> 4. Tenon-and-mortise joints, in which neither adhesive nor wedge was used, showed also relatively low joint modulus that was around the level of 10-⁴ rad/kgf. em.<br/> 5. Wedge caused increase of strength and stiffness of tenon-and-mortise joints, and the increase was more evident when adhesive was used.<br/>

압축변형 하에서 목재의 응력이완에 대한 이론 모형

장상식(Sang Sik jang),강춘원(Chun Won Kang) 한국가구학회 1998 한국가구학회지 Vol.9 No.2

압축변형 하에서 목재의 응력이완 실험을 실시하였으며 이에 대한 이론모형을 개발하였다. 이론모형을 개발하기 위하여 목재의 크리프에 관한 이론 및 모형들을 기초로 하였으며 모두 세가지의 이론모형들이 개발되었다. 4요소모형인 Burger's model은 지수함수형의 응력이완 모형으로 개발되었으며 점탄성 이론과 점성-점탄성 이론은 각각 점탄성 모형과 삼적분 응력이완 모형을 얻기 위하여 적용되었다. 이론모형의 계수를 구하고 그 정확도를 검증하기 위하여 미송(Douglas-fir)무결점 시험편을 제작하여 500, 1000, 1500, 2000 및 2500kgf(×9,80N)의 압축에 상당하는 변형을 가하여 응력이완 시험을 실시하였다. 500, 1500, 2500kgf(×9,80N)의 하중 하에서의 시험 결과는 이론모형의 계수를 구하기 위하여 사용되었고 나머지 하중 하에서는 시험 결과는 이론 모형의 정확도를 검증하기 위하여 사용되었다. 세가지 이론모형 중에서는 점성-점탄성 이론에 근거한 삼적분모형이 가장 정확한 예측치를 나타내었다.<br/> Keyword:stress relaxation, creep, theoretical model, viscous-viscoelastic theory, compressive strain

플러쉬문의 심재구성에 따른 강성도 및 내충격성의 변화

장상식(Sang Sik Jang) 한국가구학회 2001 한국가구학회지 Vol.12 No.1

This study was carried out to evaluate the feasibility of using HDF as surface panels as well as core mataials for flush door maufacturing. Several core compositions were developed and applied to manufacture door specimens. Core materials were tested under bending load, door manufacturing process was analysed to find better way of using HDF for door manufacturing, and door specimenswere tested under bending, twisting and impact loads.<br/> From this study, it was concluded that HDF can be used to manufacture quality flush doors. And it was desirable to use light color HDF as surface panels because dark color HDF caused a problem in manufacturing process by shadow shown through finishing veneer. HDF doors were light, and showed good quality and higher resistance against bending, twisting and impact loads.<br/> Keywords: Flush door, Stiffness, Core, lmpact-resistance, HDF<br/>

목재 조립보 헤더의 휨 성능 분석

장상식 ( Sang Sik Jang ),김윤희 ( Yun Hui Kim ),박영란 ( Young Ran Park ) 한국목재공학회 2007 목재공학 Vol.35 No.6

환경 노출 조건 하에서 심재구성에 따른 플러쉬문의 변형

장상식 ( Sang Sik Jang ) 한국목재공학회 2003 목재공학 Vol.31 No.2

기둥-보 및 SIP 패널을 이용한 복합 전단벽의 수평하중 저항 성능

장상식 ( Sang Sik Jang ),이형우 ( Hyoung Woo Lee ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.1

SIP(Structure insulated panel) is a form of sandwich panel used in the construction industry. SIP is a sandwich structured composite, consisting of an insulating layer of rigid core sandwich between two layer of structural board, used as a building material. Using SIP will have a tighter building envelope and the walls will have higher insulating properties, which leads to fewer drafts and a decrease in operating cost. In this study, SIP panel composed of 11.1mm thick OSB(SIP-O) or 12mm thick plywood(SIP-P) face and back glued to 140mm thick styrofoam was used as the component providing the shear-resistance. In case of the SIP panel, it was attached to be located outside the post and beam. 270mm long self tapping screws were used spacing 150mm to attach SIP panel to post and beam structural, 63mm nails were used spacing 150mm to attach each SIP panel. Specimens were tested under cyclic lateral-load in accordance with KS F 2154. From the test results, The maximum stiffness coefficient was calculated as 11.95kN/mm and 20.43kN/mm for SIP-O and SIP-P respectively. The maximum shear strength was obtained as 19.08kN/m and 21.92kN/m for SIP-O and SIP-P respectively. When comparing the shear strength of the composite structure developed in this study with that the light-frame shear wall, the composite structure showed about 2.5~3 times higher strength than the light-frame shear wall.

L-Tie를 사용한 경골전단벽의 수평하중저항 성능

장상식 ( Sang Sik Jang ),이형우 ( Hyoung Woo Lee ),이덕용 ( Deok Yong Lee ),전재환 ( Jeon Jae Hwan ) 한국목재공학회 2021 한국목재공학회 학술발표논문집 Vol.2021 No.2

지진발생 횟수가 늘어남에 따라 내진설계에 대한 중요성이 높아지고 있다. 우리나라 또한 2016년 경주 지진과 2017년 포항지진이 일어남에 따라 건축법 시행령이 개정 되었고, 소규모 목조건축을 포함한 모든 건축물은 내진설계를 실시하여야 한다. 이 연구는 최근 국내의 목조건축 전문기업인 T기업에서 개발한 L-Tie를 이용한 경골 전단벽의 수평하중저항 성능을 평가하기 위해 수행되었다. L-tie는 목조건물의 내진성능을 향상시키기 위하여 제작된 Hold down 대체 철물로서 L형 철물과 함께 전단벽의 상·하부를 지름 16㎜의 지지봉으로 연결하여 일체화시킴으로서 다양한 복합 지진의 진동을 흡수하고 복원시키는 역할을 한다. 이 연구에 사용된 전단벽은 2″× 6″구조재를 610㎜ 간격으로 배치하였으며, 한 쪽 면에는 7/16″OSB를 8d 못을 사용하여 100㎜-200㎜(LT-100)와 150㎜-300㎜(LT-150) 두 가지의 간격으로 고정시켰다. 이 연구에서는 KS F 2154에 따라서 전단벽 시편에 준정적 반복하중(quasi-static cyclic load)을 가하면서 전반변형을 측정하였다. 전단 강성계수(shear stiffness coefficient)는 LT-150의 경우 5.94kN/mm, LT-100 의 경우 15.13kN/mm로 나타났고, 최대 전단내력(Shear strengh)은 LT-150이 13.48kN/m, LT-100이 18.84kN/m으로 측정되었으며 최대전단내력은 LT-100이 LT-150보다 약 1.3배 높은 것으로 나타났다. 또한 기존의 경골목구조 전단벽의 최대 전단내력과 비교하였을 경우에 LT-100은 약 3.1배, LT-150은 약 2.2배 정도 높은 것으로 나타난다.

반복하중하에서 다보결합부의 역학적 특성

장상식 ( Sang Sik Jang ) 한국목재공학회 1995 한국목재공학회 학술발표논문집 Vol.1995 No.-

기둥-보에 SIP 패널을 설치한 복합구조의 개발

장상식 ( Sang Sik Jang ),이형우 ( Hyoung Woo Lee ) 한국목재공학회 2021 한국목재공학회 학술발표논문집 Vol.2021 No.1

This research was performed to develop highly insulated wall component for heavy timber post and beam structure to improve the energy efficiency and the shear resistance against lateral load. In this study, SIP panel composed of 11.1mm thick OSB face and back glued to a 90mm thick styrofoam at center was used as the component providing the shear-resistance. To attach the SIP panel to the post and beam structure, three different methods depending to the relative position of SIP to the post and beam were employed, which include the followings: outer attachment (E-SIP), middle attachment (P-SIP), inner attachment (N-SIP) 300mm long self tapping screws were used with two spacing of 150mm and 300mm to attach SIP panel to timber structure for the specimen types of E-SIP. in case of P-SIP, 180mm long self tapping screws were used with spacing of 150mm and 300mm to attach SIP panel to timber structure, which 90mm nails were used for the specimen type N-SIP. Specimens were tested under lateral-loads in accordance with KS F 2154. From the test results, the shear stiffness coefficient was calculated as 6.2kN/mm, 5.5kN/mm, 4.8kN/mm, 3.9kN/mm and 6.6kN/mm for E-SIP-150, E-SIP-300, P-SIP-150, P-SIP-300 and N-SIP-150, respectively. The naximum shear strength was obtained as 27.5N/mm, 21.1N/mm, 25.9N/mm, 26.6N/mm and 24.8N/mm for E-SIP-150, E-SIP-300, P-SIP-150, P-SIP-300 and N-SIP-150, respectively. When comparing the shear strength of the composite structure developed in this study with that of the light-frame shear wall, the composite structure showed about 3∼5 times higher strength than the light frame shear wall.