A re-examination of the current design rule for staggered bolted connections
Xue-Mei Lin,Michael C.H. Yam,Ke Ke,Binhui Jiang,Qun He
Abstract
This paper summarised and re-examined the theoretical basis of the commonly used design rule developed by Cochrane in the 1920s to consider staggered bolt holes in tension members, i.e., the s 2 /4g rule. The rule was derived assuming that the term two times the bolt hole diameter (2d0) in Cochrane' s original equation appreciably overestimates the net section area of a staggered bolted connection with a small g/d0 ratio. However, the assumed value of 0.5 for the fractional deduction of a staggered hole underestimates the staggered net section area for small g/d0 ratios. To improve the applicability of the above two assumptions, a modified design equation, which covers a full range of g/d0 ratio, was proposed to accurately predict the staggered net section area and was validated by the existing test data from the literature and numerical data derived from this study. Finally, a reliability analysis of the test and numerical data was conducted, and the results showed that the reliability of the modified design equation for evaluating the net section resistance of staggered bolted connections can be achieved with the partial factor of 1.25.
Key Words
bolted connections; finite element analysis; net section area; parametric study; staggered hole arrangement; theoretical analysis
Address
Xue-Mei Lin and Michael C.H. Yam and Qun He — 1)Department of Building and Real Estate, The Hong Kong Polytechnic University, Hong Kong, China 2)Chinese National Engineering Research Centre for Steel Construction (Hong Kong Branch), The Hong Kong Polytechnic University, Hong Kong, China
Ke Ke — School of Civil Engineering, Chongqing University, Chongqing, China
Binhui Jiang — School of Civil Engineering, Central South University, Changsha, China
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