A study on high-strength bolts and slip-critical connections with welds

• Main Authors: Kai-Yuan Suei, 隋開元
• Other Authors: Heui-Yung Chang
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/60558647545572034856

碩士 === 國立高雄大學 === 土木與環境工程學系碩士班 === 103 === As suggested by AISC (2010), Taiwan steel design regulations do not recommend slip-critical high strength bolts to use with fillet welds. No similar restrictions are set by AIJ (2012). This paper evaluates the deformation capacity and strength of slip-critical high strength bolts in combination with fillet welds. AIJ suggests that bolts may have sliding deformations of 0.2 mm. The analyzed 45 joints were found to have deformations greater than the sliding deformation, and even greater than the fracture deformations of fillet welds. The joint strength were found to approximate to 90% of the sum of bolt sliding strength and weld fracture strength. The percentage is slightly smaller than that for transvers and longitude welds. The nominal values of bolt sliding strength and weld fracture strength were calculated using AISC formula, and were then summed up to calculation the joint strength as suggested by AIJ. The ratio of test to calculation was taken as the factor of safety (S.F.). The S.F. values of the 119 analyzed joints were found to have a maximum of 2.75, a minimum of 1.23, and an average of 1.92.