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Title |
Evaluation on the Behavior of Slip Critical Joints with TS High Strength Bolts Subjected to a Size of Bolt Holes
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Authors |
이현주 ; 김강석 ; 나환선 ; 이강민 ; 김현철 |
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Keywords |
고력볼트 ; 볼트 구멍 ; 미끄럼하중 ; 미끄럼계수 ; 장기축력이완 High strength bolts ; Hole size of bolts ; Slip load ; Slip coefficient ; Relaxation |
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Abstract |
The oversized and slotted holes are frequently required for the built-up in construction sites. The foreign provisions specify the reduction of the slip load subjected to the size of bolt holes and the direction of load. There are no domestic building codes and researches on the bolt holes. Therefore, it is necessary to evaluate a change of joint strength quantitatively according to the bolt-hole size and surface condition by means of experiment. This study was conducted to evaluate the slip load subjected to the size of bolt holes ,and measured on a change of clamping force of high strength bolts during 168 and 800 hours to analyze the trend of relaxation after fastening bolts. Torque shear bolts defined on KS B 2819 was used for the specimen. Test results exhibit that the variation on the slip load of the others was below 10% by contrast with the standard hole and the highest rate of relaxation was 2.66% of the initial clamping force at the case of the long-slotted hole of 2.5D.
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