Load capacity of shallow embedded flat plate steel fixings

Abstract

A series of experimental investigations were undertaken on cast-in concrete anchors manufactured from varying arrangements of flat steel plates. This form of anchors is relatively unique to the construction industry in New Zealand and as such very little research has been undertaken to determine their ability to resist applied loads. The experimental investigations were aimed at determining the load deformation responses of the anchors under direct tension, direct shear and a combination of tension and shear loads.

The experimental results obtained from the investigation were compared to the CCD design method which has been adopted in Appendix D of ACI 318. A series of modifications were suggested to allow the CCD design to be used with flat plate anchors and to convert the approach into Metric units suitable for use in New Zealand.

An analytical investigation compared the lower 5th percentile experimental results obtained from the tested anchors with the modified CCD design approach. It was found that the modified CCD design method developed in this investigation lower 5th percentile experimental results and it is suggested that the design approach be adopted in New Zealand to predict the theoretical load carrying capacity of concrete insert anchors.