This CIDECT programme 5BN deals with a more detailed investigation of chord failures in 50% and 100% overlap joints. The total programme consists of an experimental part carried out by Nanyang University of Technology in Singapore and an analytical and a numerical part carried out by Delft University of Technology, Delft, The Netherlands. This paper deals with the complete numerical investigation of 50% overlap joints covering uniplanar and multiplanar joints.
The numerical results indicate that in most cases the 50% uniplanar overlap joints fail by the overlapping brace effective width criterion.
The multiplanar 50% overlap joints fail mostly by yielding of the chord member at the joint location due to axial load and bending, or by overlapping brace failure (brace effective width criterion). In some cases the capacity of the joints in the calculations was limited by brace member buckling.
It was found that for gap joints and the more stocky overlap joints the same strength equations could be used, provided that for multiplanar joints the larger chord forces were taken into account. It was further shown that for overlap joints with a slender chord and for multiplanar overlap joints with medium to slender b0/t0 ratios a chord face failure could occur, which is not covered by the strength criteria in the current codes and recommendations.
As a logical consequence CIDECT decided to investigate the overlap K- and KK-joints in more detail in this programme 5BN. This programme deals with a more detailed investigation of 50% and 100% overlap joints covering uniplanar and multiplanar joints. The programme consists of an experimental part carried out by Nanyang University of Technology in Singapore and an analytical and a numerical part carried out by Delft University of Technology, Delft, The Netherlands.
