In this study, mechanical behavior and designing method for multiple-joints were examined. Three joint forms, which were single-hole joints, two-holes in parallel and two-holes in series, were chosen. As a result, the behavior of the multiple-joints was different with that of singleholed joints. Especially, joints that exhibited bearing failure in single-hole joints appeared nettension failure in two-holes in series. So it is cleared that designing using the data of singlehole is very dangerous since bearing failure appears safety fracture propagation and high strength but net-tension failure appears risky fracture propagation and low strength. So it is necessary to examine the design method that considers the stress distribution of multiple-joints. The proposed strength prediction method using a numericla analysis was applied to multiplejoints. It is cleared that the real jointed structures can be designed by the proposed method since good agreement was obtained between experimental and predicted joint strength.
展开▼
