Experimental and analytical investigation of the crack behaviour of dapped-end beams
Open access
Datum
2025-01-01Typ
- Journal Article
ETH Bibliographie
yes
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Abstract
Reinforced concrete dapped ends are a widely used connection for precast elements in infrastructure and building structures. However, they are prone to major durability problems due to the formation of an inclined crack at the re-entrant corner of the joint. The crack typically forms at low loads and reaches a significant opening under service load conditions, causing corrosion and stress concentration in the reinforcement, which impairs the safety of the connection. The behaviour of these cracks in a highly disturbed structural region is not well understood. This paper presents the experimental results of 28 dapped-end tests in which the crack behaviour in the re-entrant corner was continuously measured using digital image correlation. The main test variables are the amount of dapped-end reinforcement, the presence of diagonal reinforcement and the ratio of horizontal to vertical dapped-end reinforcement area. The bond behaviour of the dapped-end reinforcement was estimated from the measured crack widths and reinforcement strains, assuming a pull-out mechanism with constant bond shear stresses on both crack sides. The paper proposes a model for evaluating the width of corner cracks at service loads, in which the reinforcement strains are derived from strut-and-tie models. The modelling results agreed satisfactorily well with the experimental observations of this study and 28 additional tests from the literature for dapped-ends with reinforcement diameter below 20 mm. Mehr anzeigen
Persistenter Link
https://doi.org/10.3929/ethz-b-000698511Publikationsstatus
publishedExterne Links
Zeitschrift / Serie
Engineering StructuresBand
Seiten / Artikelnummer
Verlag
ElsevierThema
Concrete structures; Dapped-end beams; Experimental study; Strut-and-tie models; Service behaviour; Crack behaviour; Bond behaviour; Digital image correlationOrganisationseinheit
09469 - Kaufmann, Walter / Kaufmann, Walter
ETH Bibliographie
yes
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