Abstract
Reinforced concrete (RC) structural members strengthened with ultrahigh-performance concrete (UHPC) have shown excellent performance in past experimental investigations. However, methods of predicting their capacity are currently very limited. This paper presents six independent methods of predicting the shear capacity of UHPC–concrete composite members based on the application of existing design codes. Three of these methods are based on the conversion of the volume fraction of steel fibres in the UHPC in an equivalent longitudinal steel ratio. The other three methods involve the computation of the shear strength as a sum of the contributions to the shear strength by the RC member and the UHPC layer, each of which is independently calculated. It was demonstrated that the proposed methods based on existing design codes are able to predict the strength of UHPC–concrete composite members with reasonable accuracy.
Highlights
Ultrahigh-performance concrete (UHPC) has been increasingly considered as a potential tool in strengthening reinforced concrete (RC) structural elements
This paper introduces six methods of predicting the shear capacity of ultrahigh-performance concrete (UHPC)–concrete composite members based on modifications to existing design models
A total of six methods of predicting the shear capacity of UHPC–concrete composite members based on existing design codes were presented in this paper
Summary
Ultrahigh-performance concrete (UHPC) has been increasingly considered as a potential tool in strengthening reinforced concrete (RC) structural elements. Several current design codes for RC structural members, such as ACI 318 (2008), or for fibre-reinforced concrete (FRC) members, such as ACI 544 (1988), involve the calculation of the shear strength as the sum of the shear force resisted by normal-strength concrete (NSC) or UHPC and by shear reinforcement Applications based on the modification of existing design models of RC or FRC structures could be useful because they are simple and easy to use For this purpose, this paper introduces six methods of predicting the shear capacity of UHPC–concrete composite members based on modifications to existing design models. The present paper expands on a previous study (Yin et al 2018) by adding new methods, results, and findings
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