INFLUENCE OF BENDING COMPRESSIVE STRESSES ON THE CONCRETE CONE CAPACITY

摘要

In the present paper the influence of bending compressive stresses on the concrete cone failure load of anchor bolts used to anchor a column into a foundation was investigated. The compressive stresses spread from the column base conically toward the foundation base and can influence the concrete cone failure capacity. To investigate the problem a column-foundation connection was designed and analyzed with the nonlinear FE program MASA. The distance between the resulting compressrve force and the anchor tensile force was varied. Usually anchorages are designed using the CC-method (Concrete Capacity Method) neglecting this positive influence of compressive stresses on the concrete cone failure load. In order to take this effect into account the numerical results are compared with the CC-method and a multiplication coefficient is suggested. The multiplication coefficient is dependent on the relation between the internal lever arm of the column and the effective embedment depth.