Abstract
Concrete splitting failure due to tension load can occur when fastening systems are located close to an edge or corner of a concrete member, especially in thin members. This failure mode has not been extensively investigated for anchor channels. Given the current trend in the construction industry towards more slender concrete members, this failure mode will become more and more relevant. In addition, significantly different design rules in the United States and Europe indicate the need for harmonization between codes. Therefore, an extensive numerical parametric study was carried out to evaluate the influence of member thickness, edge distance, and anchor spacing on the capacity of anchor channels in uncracked and unreinforced concrete members. One of the main findings was that the characteristic edge distance depends on the member thickness and can be larger than 3hef (hef = embedment depth) for thin members. Based on the numerical and experimental test results, modifications of the design recommendations for the splitting failure mode are proposed. Overall, the authors recommend performing the splitting verification separately from the concrete breakout to design anchor channels in thin members more accurately.
Highlights
Concrete splitting failure due to tension load can be decisive when installing a fastening system close to an edge or corner, especially in relatively thin concrete members
An extensive numerical parametric study was carried out to evaluate the influence of member thickness, edge distance, and anchor spacing on the capacity of anchor channels in uncracked and unreinforced concrete members
One of the main findings was that the characteristic edge distance depends on the member thickness and can be larger than 3hef for thin members
Summary
Concrete splitting failure due to tension load can be decisive when installing a fastening system close to an edge or corner, especially in relatively thin concrete members. The main objective of this paper is to study the behaviour of anchor channels subjected to tension close to an edge. Possible improvements for the current design model for concrete splitting are proposed and the conclusions are discussed in detail. Another challenge arises from the different design rules for concrete splitting failure in the US (ACI 318 [1] with the amendment of AC 232 [2] for anchor channels) and Europe (EN 1992-4 [3]). A base for the harmonization of the codes in the US and Europe is provided in this paper
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