Journal of the Korean Society for Advanced Composite Structures (복합신소재구조학회 논문집)

Korean Society for Advanced Composite Structures (한국복합신소재구조학회)
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A Study on the Secure Plan of Clamping Force according to the Variation of Torque-Coefficient in Torque-Shear High Strength Bolts

토크전단형 고력볼트의 토크계수 변동에 따른 체결축력 확보방안에 관한 연구

  • 이현주 (한국전력공사 전력연구원) ;
  • 나환선 (한국전력공사 전력연구원) ;
  • 최성모 (서울시립대학교 건축학부)
  • Received : 2014.09.01
  • Accepted : 2014.09.19
  • Published : 2014.09.30
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Abstract

Torque control method and turn of nut method are specified as clamping method of high strength bolts in the steel construction specifications. Quality control of torque coefficient is essential activity because torque control method, which is presently adopted as clamping method in domestic construction sites, is affected by variation of torque coefficient. The clamping of torque shear bolt is based on KS B 2819. It was misunderstood that the tension force of the TS bolt was induced generally at the break of pin-tail specified. However, the clamping forces on slip critical connections do not often meet the intended tension, as it considerably varies due to torque coefficient dependent on the environmental factors and temperature variables despite the break of the pin tail.This study was focused to evaluate the effect of environmental factors and errors of installing bolts during tightening high strength bolts. The environmental parameters were composed of 'wet' condition, 'rust' condition, 'only exposure to air' condition. And the manufacture of trial product was planned to identify the induced force into the bolts. The algorithm for a trial product was composed of the relation between electricity energy taken from torque shear wrench and tension force from hydraulic tension meter.

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References

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