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44,10 €ISBN 978-3-8191-0459-6184 pages74 figuresEnglishThesis
January 2026
eBook (PDF)
José Ignacio Croppi
Lap splices between post-installed and cast-in-place reinforcements
Design and experiments
Post-installed (PI) lap splices provide a reliable solution for connecting concrete elements that are cast at different times by overlapping cast-in-place (CI) reinforcing bars (rebars) with PI rebars. Although PI rebars embedded in high-performance mortars can provide improved bond-splitting behavior compared to CI rebars, their design is still restricted by guidelines originally developed for lap splices that exclusively involve CI rebars (CI lap splices).
This thesis investigates the bond behavior of PI lap splices to explore efficient design alternatives. It focuses on high-performance mortars under static or quasi-static tensile loading. The research is structured into three main fields: i) single CI and PI rebar anchorages, ii) PI lap splices in ordinary and steel fiber-reinforced concrete (SFRC), and iii) conventional one-to-one CI and PI lap splices, as well as novel non-contact PI lap splice designs featuring (n)-to-(n-1) and two-to-one configurations.
The findings indicate that PI single anchorages can achieve up to three times higher bond strength than CI rebars under confined conditions. Experimental investigations show that PI lap splices exhibit bond strength and crack control performance comparable to, or even exceeding, that of CI lap splices. Furthermore, the evaluation of PI lap splices in SFRC demonstrates enhanced bond capacity and ductility.
At the structural level, the investigation confirms that (n)-to-(n-1) and two-to-one non-contact PI lap splices achieve steel yielding with very short lap lengths. These novel designs offer significant advantages over conventional approaches. Based on these findings, this thesis provides recommendations for incorporating this design concept into the next-generation Eurocode 2.
This thesis investigates the bond behavior of PI lap splices to explore efficient design alternatives. It focuses on high-performance mortars under static or quasi-static tensile loading. The research is structured into three main fields: i) single CI and PI rebar anchorages, ii) PI lap splices in ordinary and steel fiber-reinforced concrete (SFRC), and iii) conventional one-to-one CI and PI lap splices, as well as novel non-contact PI lap splice designs featuring (n)-to-(n-1) and two-to-one configurations.
The findings indicate that PI single anchorages can achieve up to three times higher bond strength than CI rebars under confined conditions. Experimental investigations show that PI lap splices exhibit bond strength and crack control performance comparable to, or even exceeding, that of CI lap splices. Furthermore, the evaluation of PI lap splices in SFRC demonstrates enhanced bond capacity and ductility.
At the structural level, the investigation confirms that (n)-to-(n-1) and two-to-one non-contact PI lap splices achieve steel yielding with very short lap lengths. These novel designs offer significant advantages over conventional approaches. Based on these findings, this thesis provides recommendations for incorporating this design concept into the next-generation Eurocode 2.
Keywords: reinforced concrete; lap splice; bond; post-installed rebar; fiber-optic sensor; direct tension test; pullout test; bond stress distribution; steel fiber reinforced concrete; splitting failure
Schriftenreihe des Instituts für Konstruktiven Ingenieurbau
Edited by Prof. Dr.-Ing. R. Breitenbücher, Prof. Dr.-Ing. Rüdiger Höffer, Univ.-Prof. Dr. Markus Knobloch, Univ.-Prof. Dr.-Ing. habil. Peter Mark and Prof. Dr.-Ing. Markus Thewes, Bochum
Volume 2026,1
Other formats
Print version: 978-3-8191-0503-6
DOI 10.2370/9783819104596
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