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. 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.

ABSTRACT
 1. 서 론
 2. 현장 문제점 분석
  2.1 현장반입 및 보관 단계
  2.2 체결전 검사, 가볼트 체결
  2.3 1차 체결, 금매김
  2.4 2차 체결, 검사
 3. 실험 및 결과분석
  3.1 실험체 구성 및 방법
  3.2 실험결과
 4. 결론
 참고 문헌

• 이현주(한국전력공사) | Lee Hyeon-Ju
• 나환선(한국전력공사) | Nah Hwan-Seon