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Structural Engineering and Mechanics Volume 32, Number 4, July10 2009 , pages 477-488 DOI: https://doi.org/10.12989/sem.2009.32.4.477 |
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Evaluation of slip coefficient of slip critical joints with high strength bolts |
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Hwan-Seon Nah, Hyeon-Ju Lee, Kang-Seok Kim and Woo-Bum Kim
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| Abstract | ||
| A slip critical joint has various values to adopt the proper slip coefficient in various conditions of faying surfaces in the following codes: AISC, AIJ and Eurocode 3. However, the Korean Building Code still regulates the unique slip coefficient, 0.45, regardless of the diverse faying conditions. In this study, the slip resistance test, including five kinds of surface treatments were conducted to obtain the proper slip coefficients available to steel plate KS SM490A. The faying surfaces were comprised of a clean mill, rust, red lead paint, zinc primer, and shot blast treatment. The candidates for high strength bolts were torque-shear bolts, torque-shear bolts with zinc coating, and ASTM A490 bolts. Based on the test results, the specimens with a shot blasted surface and rusted surface exhibited ks, 0.61, and 0.5, respectively. It is recommended that the specimens with zinc primer exhibit ks | ||
| Key Words | ||
| slip coefficient; slip critical joint; tension; high-strength bolts; relaxation. | ||
| Address | ||
| Hwan-Seon Nah, Hyeon-Ju Lee and Kang-Seok Kim: Environmental & Structural Lab., Korea Electric Power Research Institute 65 Munji-Ro, Yusung-Gu, Daejon 305-380, Korea Woo-Bum Kim: Architectural Engineering Department, Kongju National University, 182 Shinkwan-Dong Kongju, Chungnam, Korea | ||