Abstract
This paper introduces an innovative one-sided bolt with ellipse head and examines its mechanical performance based on experimental and numerical studies of double lapped joint configuration. The design of one-sided bolt mechanism and geometry was completed through detailed Finite Element (FE) analysis considering contact behaviours and bolt pre-tensioning. Four bolt head geometries were assessed and comparatively studied in terms of yielding capacity, slip distance and stress concentration; and two bolt diameters and two installation configurations were introduced for each bolt head geometry. Experiments were then conducted based on the specimens manufactured with the optimised geometry for validation of the design and installation considerations, with comparison to ordinary bolts. It was found that the optimal aspect ratio of the ellipse bolt head is about 1.7 and orthotropic installation configuration was recommended. Such innovative one-sided bolts with simple manufacturing and installation sequence exhibit comparable shear performance with ordinary bolts, enabling the use of closed sections for construction with easy assembly and disassembly.
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