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송현근(Song Hyun-Geun),정효원(Jung Hyo-Won),김지환(Kim Ji-Hwan),양일승(Yang Il-Seung),김순철(Kim Soon-Chul),문연준(Moon Youn-Joon) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
The full penetration welded joint should not be gap, but the welding defects in the field are sometimes occurred. Because the strength reduction in the full penetration welded joint with gaps are expected, the allowable tolerance must be kept. This study, tensile tests on beam-beam welded joints with gaps are conducted to evaluate the relationship between tensile strength and the amount of gaps. The thickness(t) tensile specimens is 19㎜ and, SS400 class steel is used. The main variables are beveling shape(L-type, K type), unevenness(e: 0, 2, 4, 6 (㎜)), backing piece(1, 2), and the unevenness direction (up, down). And, the CO₂ gas shield arc semi-automatic welding is used. Also, the temperature of the welding between pass was less than 250 ℃. Also, comparison of a criterion and to the experiment results was performed. It is concluded that specimens with unevenness over 4㎜ on full penetration welded joint has lower yield strength, maximum strength and smaller deformation ability than a specimen with normal specimen. Afterward, studies of repairing of welded joints are required.
김순철(Kim Soon-Chul),문연준(Moon Youn-Joon),송현근(Song Hyun-Geun),양일승(Yang Il-Seung) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.5
The easy assembly joint system is required because the number of skillful carpenters is decreasing remarkably in korea. Main objective of this study is to investigate experimently the structural performances of the new type connecting system, which is composed of metal connector and adhesive. The metal connectors embedded into the wood with adhesive in new type connecting system. In order to improve the bond strength, threaded steel rods are used as metal connector. The advantages of this system are as follows. (1) Easy control of strength, (2) Easy assembly, (3) Fire resistance, (4) corrosion resistance, (5) Fine appearance, (6) Saving material. Tension tests for splices, bending tests for mid-span splices and tension strength of splices for curing period were carried out. From this result, the fundamental data for structural design of wooden frame was obtained. The assembly at connection and reasonable structural design can be carried out easily by using this new connection system.