An anchorage system is necessary in most reinforced concrete structures for connecting attachments. It is very\nimportant to predict the strength of the anchor to safely maintain the attachments to the structures. However, according to\nexperimental results, the existing design codes are not appropriate for large anchors because they offer prediction equations only\nfor small size anchors with diameters under 50 mm. In this paper, a new prediction model for breakout shear strength is suggested\nfrom experimental results considering the characteristics of large anchors, such as the prying effect and size effect. The proposed\nequations by regression analysis of the derived model equations based on the prying effect and size effect can reasonably be used\nto predict the breakout shear strength of not only ordinary small size anchors but also large size anchors.
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