Simplified analytical fracture mechanics model for the evaluation of concrete cone capacity of a single headed stud and experimental validation on anchors with various embedment depths
Résumé
In structural engineering applications, cast-in place steel headed studs are commonly used to transfer external loads to concrete members. When subjected to a tensile load, a single headed stud placed far from concrete edges and adjacent anchors is likely to fail by pulling out a cone-shaped concrete chunk. To determine the concrete cone failure load of a single headed stud, most of the current design-oriented documents adopt the well-known Concrete Capacity Design (CCD) method. This method is userfriendly for engineers, as the only required entry data are the anchor embedment depth and the compressive strength of the concrete. However, as this method was mainly derived from regression analyses of experimental results obtained at room temperature, it might not be suitable for conditions where concrete has been exposed to high temperature. In this paper, a simplified theoretical model using fracture mechanics theory to describe the concrete cone capacity of a single headed stud at room temperature is presented. Then, the accuracy of the model for four different embedment depths is verified. In the model, hypothesis and simplifications are made on the basis of the failure mechanism, and the controlling material parameters are the fracture energy and Young's modulus of concrete. This approach is advantageous for its simplicity without, however, losing the description of the failure mechanism. Confrontation of the predictions of the model to experimental results yielded good agreement for all embedment depths. This analytical model could be used for future development of prediction methods in special contexts, such as the presence of thermal loading.
Domaines
Structures
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