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탄소강 용접접합부의 모재블록전단내력에 관한 실험적 연구
이화영(Lee, Hwa-Young),황보경(Hwang, Bo-kyung),이후창(Lee, Hoo-Chang),김태수(Kim, Tea-Soo) 대한건축학회 2018 大韓建築學會論文集 : 構造系 Vol.34 No.1
An experimental study on the ultimate behaviors of the mild carbon steel (SPHC) fillet-welded connection is presented in this paper. Seven specimens were fabricated by the shielded metal arc welding (SMAW). All specimens failed by typical block shear fracture in the base metal of welded connections not weld metal. Block shear fracture observed in the base metal of welded connection is a combination of single tensile fracture transverse to the loading direction and two shear fractures longitudinal to the loading direction. Test strengths were compared with strength predictions by the current design equations and suggested equations by previous researchers. It is known that current design specifications (AISC2010 and KBC2016) and Oosterhof & Driver"s equation underestimated overly the ultimate strength of the welded connection by on average 44%, 31%, respectively and prediction by Topkaya’s equation was the closest to the test results. Consequently, modified equation is required to be proposed considering the stress triaxiality effect and material property difference on the block shear strength for base metal fracture in welded connections fabricated with mild carbon steel.
연단거리를 변수로 갖는 오스테나이트계 스테인리스강(STS201) 일면전단 볼트접합부의 최대내력에 관한 해석연구
차은영,황보경,이후창,김태수,Cha, Eun-Young,Hwang, Bo-Kyung,Lee, Hoo-Chang,Kim, Tae-Soo 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 논문집 Vol.21 No.5
This study focused on the ultimate behaviors(ultimate strength and fracture mode ) of single shear bolted connection with austenitic sainless steel(STS201) and curling effect on the ultimate strength using finite element analysis based on test results. Main variables are end distance in the parallel direction to loading and edge distance in the perpendicular direction to loading. The validation of finite element analysis procedures was verified through the comparisons of ultimate strength, fracture mode and curling(out-of-plane deformation) occurrence between test results and numerical predictions. Curling was observed in both test and analysis results and it reduced the ultimate strength of single- shear bolted connections with relatively long end distances. Strength reduction ratios caused by curling were estimated quantitatively by maximum 19%, 32%, respectively for specimens with edge distance, 48 mm and 60 mm compared with strengths of uncurled connections with restrained out-of-plane deformation. Finally, analysis strengths were compared with current design strengths and it is found that design block shear equations did not provide the accurate predictions for bolted connections with strength reduction by curling.
오스테나이트계 스테인리스강(STS304) 필릿 용접접합부의 모재 블록전단강도에 관한 실험적 연구
황보경(Hwang, Bo-Kyung),이후창(Lee, Hoo-Chang),김태수(Kim, Tae-Soo) 대한건축학회 2017 大韓建築學會論文集 : 構造系 Vol.33 No.1
Many studies on structural behaviors of stainless steel structural members have been performed thanks to their superior material properties such as ductility, fire resistance and corrosion resistance. Austenitic stainless steels (STS304) with nickel have been used the most in building structure among stainless steel groups. This paper focused on the block shear fracture behavior of base metal in fillet-welded connection fabricated with austenitic stainless steel. Although the block shear behavior for welded connection due to stress triaxiality and shear-lag effect is different from that of bolted connection, the block shear strength equation of welded connection in current design specifications has been referred to that of bolted connection. Main parameters are weld length and welding method (Arc and TIG welding). It is known from test results that there was no big difference in ultimate strengths according to welding method. Predictions by current specifications (KBC, AISC and EC) and existing proposed equations were compared with those of test results. Most of strength equations underestimated overly test strengths and predictions by Oosterhof et al.’s equation was close to block shear strength of base metal in fillet-welded connections.