CONCRETE CAPACITY DESIGN (CCD) APPROACH FOR FASTENING TO CONCRETE

A user-friendly, highly transparent model for the design of post-installed steel anchors or cast-in-place headed studs or bolts, termed the concrete capacity design (CCD) approach, is presented. This approach is compared to the well-known provisions of the American Concrete Institute (ACI) 349-85. The use of both methods to predict the concrete failure load of fastenings in uncracked concrete under monotonic loading for important applications is compared. Variables included single anchors away from and close to the edge, anchor groups, tension loading, and shear loading. A data bank including approximately 1,200 European and American tests was evaluated. The comparison shows that the CCD method can accurately predict the concrete failure load of fastenings for the full range of investigated applications. On the other hand, depending on the application in question, the predictions of ACI 349 are sometimes unconservative and sometimes conservative. The CCD method is more user-friendly for design. Based on this, the CCD method is recommended as the basis for the design of fastenings.