Journal of the Architectural Institute of Korea Structure & Construction (대한건축학회논문집:구조계)

Architectural Institute of Korea (대한건축학회)
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An Experimental Study on Block Shear Strength of Carbon Steel Fillet Welded Connection with Base Metal Fracture

탄소강 용접접합부의 모재블록전단내력에 관한 실험적 연구

  • 이화영 (유탑엔지니어링건축사사무소) ;
  • 황보경 (한밭대 대학원 건축공학과) ;
  • 이후창 (한밭대 대학원 건축공학과) ;
  • 김태수 (한밭대 건축공학과)
  • Received : 2017.07.28
  • Accepted : 2017.10.31
  • Published : 2018.01.30
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Abstract

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.

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Acknowledgement

Supported by : 한국연구재단

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