Browse > Article
http://dx.doi.org/10.11004/kosacs.2012.3.1.008

Estimation of Long Term Clamping Force of High Strength Bolts By Coating Thickness Parameters of Slip Faying Surfaces  

Nah, Hwan-Seon (한국전력공사 전력연구원)
Lee, Hyeon-Ju (한국전력공사 전력연구원)
Ryoo, Jae-Yong (서울시립대학교 건축공학과)
Choi, Sung-Mo (서울시립대학교 건축학부)
Publication Information
Journal of the Korean Society for Advanced Composite Structures / v.3, no.1, 2012 , pp. 8-15 More about this Journal
Abstract
The initial clamping forces of high strength bolts depending on different faying surface conditions drop within 1,000 hours regardless of loading, any other external force or loosening of the nut. This study is focused on an expectation model for relaxation of high strength bolt, which is confined to creep on coated faying surfaces after initial clamping. The range of this experiment is limited to estimate the relaxation of bolted joints coated by inorganic zinc primer. The candidate bolts were dacro-coated tension control bolts. The parameters of coated thickness for the faying surface were 96, 168,and $226{\mu}m$ respectively. From experiments, it exhibited that the logarithmic function for creep strain was derived due to the parameter of coating thickness. By using the creep strain, subsequently the quantitative model for estimating long term relaxation of high strength bolt can be taken with the elapsed time. The experimental results showed that the relaxation after the initial clamping of high strength bolt rose to a much higher range from 10% to 18% due to creep of the coating as the coating thickness was increased. This study showed that the clamping force reflecting relaxation after the elapse of constant time can be calculated from the initial clamping force of high strength bolt.
Keywords
torque-shear bolt; temperature; torque coefficient; tension; torque;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
연도 인용수 순위
1 Nah, H.-S., Lee, H.-J., Kim, K.-S., Kim, J.-H. and Kim, W.-B. (2009b) Evaluation of slip coefficient of slip critical joints with high strength bolts, Structural Engineers & Mechanics, 32(4), pp.477-488.   과학기술학회마을   DOI   ScienceOn
2 Nah, H.-S., Lee, H.-J., Kim, K.-S., Kim, J.-H. and Kim, W.-B. (2010) Evaluating relaxation of high-strength bolts by parameters on slip faying surfaces of bolted connections, International Journal of Steel Structures, 10(3), pp.295-303.   DOI   ScienceOn
3 Webster J. (1994) Design Formula to Predict Retained Steel Bolt Stretch when Joining A380 Aluminum Components at High Temperature, International Off-highway & Powerplant Congress & Exposition, SAE Technical Paper Series 941738, pp.1-9.
4 Yang J. and DeWolf J. (1999) Mathematical Model for Relaxation in High Strength Bolted Connections, Journal of Structural Engineering, Aug., 125(8), pp.803-808.   DOI
5 Yang J. and DeWolf J. (2000) Relaxation in High Strength Bolted Connections using Galvanized Steel, Journal of Bridge Engineering, May, 5(2), pp.99-106.   DOI
6 日本建築學會 (2003) 高力ボルト接合設計施工指針, 日本建築學會, pp. 124-126
7 김진호, 우해성, 최성모(2003) 고력볼트 마찰접합부의 설계기준 및 내력에 관한 연구, 대한건축학회논문집, 제19권 4호, pp.27-35.   과학기술학회마을
8 이승훈(2008) Minitab을 이용한 공학통계 자료분석, 이레테크, 경기도군포, pp. 179-195
9 한국강구조학회(2009) 고력볼트표준접합 설계편람, 도서출판 구미서관, 서울, pp. 19-25
10 Arimond J. (1996) Bolt-load modeling for composites, Machine Design, Farmington Hills, Michigan, USA. pp.114-118
11 ASTM F 2280-06 (2006) Twist off type tension control structural bolt/nut/washer assemblies, steel, heat treated, 150ksi minimum tensile strength, ASTM International, Philadelphia, PA, USA.
12 Bickford J. H. (1990) An introduction to the design and behavior of bolted joints, Marcel Dekker Inc., New York, N.Y., USA. pp.97-99
13 Kulak G. L, Fisher J. W. and Struik J. H.A. (2003) Guide to design criteria for bolted and riveted joints, 2nd Ed., AISC Inc., Chicago, IL., USA. pp.62-182
14 Nah, H.-S., Lee, H.-J., Kim, K.-S., Kim, J.-H. and Kim, W.-B. (2009a) Method for estimating the clamping force of high strength bolts subjected to temperature variation, International Journal of Steel Structures, 9(2), pp.123-130.   과학기술학회마을   DOI