FraMCoS 9 2016 Berkeley, California, USA

Experimental investigations on concrete edge failure of multiple row anchorages with supplementary reinforcement

This paper presents the details and results of the experimental investigations performed on the anchorages with multiple anchor rows of headed studs close to the edge, without and with supplementary reinforcement, loaded in shear towards the edge. The tests were…

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Year 2016
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Abstract

This paper presents the details and results of the experimental investigations performed on the anchorages with multiple anchor rows of headed studs close to the edge, without and with supplementary reinforcement, loaded in shear towards the edge. The tests were performed on anchorages with 2 to 8 headed studs (one to 4 anchor rows) cast in concrete with 4 different levels of supplementary reinforcement. The test results highlight the influence of supplementary reinforcement on load carrying capacity of the anchorages. It is observed that for anchorages with multiple anchor rows, the failure crack always initiates from the back row of anchors, which is in contrast to the current assumption in EN1992-4 [1]. Due to this, more number of stirrups is activated in reality and the anchorage length of the activated stirrups is significantly more than that assumed in current model of EN1992-4. Consequently, for low amounts of supplementary reinforcement, the failure loads calculated by the current model are very conservative when compared to the experimental results. At high amounts of supplementary reinforcement, the concrete strut failure may govern the failure, which is ignored in the current models. Based on the evaluation of these test results, and supporting finite element calculations using 3D FE software MASA developed at University of Stuttgart, a realistic and rational model has been developed to predict the concrete edge failure loads for anchorages with supplementary reinforcement that is presented in accompanying paper.