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01.30: Evaluation on clamping load of high strength bolts under ambient environment
Author(s) -
Nah HwanSeon,
Choi SungMo
Publication year - 2017
Publication title -
ce/papers
Language(s) - English
Resource type - Journals
ISSN - 2509-7075
DOI - 10.1002/cepa.78
Subject(s) - clamping , torque , tension (geology) , materials science , bolted joint , structural engineering , composite material , engineering , ultimate tensile strength , mechanical engineering , physics , finite element method , thermodynamics
The torque shear type high strength bolt is clamped in general when pin‐tail of shank is cut off. However the clamping loads of high strength bolt did not often meet the required tension due to variation of torque coefficient. This is why the viscosity of lubricant on bolt shank affects the torque coefficient by temperature, dust and debris. In this study, the clamping tests of various high strength bolts were performed independently both at indoor condition and at construction sites for six years. The temperature of construction sites was recorded with the range from −11°C to 34°C‥ The temperature at indoor condition was set up to compose from −10°C to 50°C at each 10°C interval. At construction sites, the clamping load of high strength bolt was varied from 159 to 210 kN and the torque value was varied from 405 to 556 Nm. The torque coefficients at construction sites were analyzed from 0.126 to 0.158 whereas tensions were measured from 179 to 192 kN by using tension meter. The torque coefficients at construction sites were analyzed to range from 0.118 to 0.152. From these tests, the diverse equations on torque coefficient, tension subjected to temperature were taken by statistic regressive analysis.