Abstract
The current Eurocode 2 (EN 1992-1-1) detailing rules can lead to considerably greater lap and anchorage lengths than previous design recommendations such as the superseded British Standard BS 8110-1. Moreover, fib Model Code 2010 (MC 2010) requires even longer laps than EN 1992-1-1. This research is motivated by complaints from industry that designing to the current EN 1992-1-1 detailing rules leads to numerous construction issues such as reinforcement congestion, as well as cost and sustainability implications, with no apparent justification. This paper presents the experimental programme which was conducted by the authors with a view to justifying reduced lap lengths more commensurate with previously proven UK experience. To this end, a series of three point bending (3PB) and four point bending (4PB) tests were designed and tested in the Structures Laboratory at Imperial College London to investigate bond stress distributions along laps of different lengths consisting of lapped reinforcing bars of the same or different bar diameters. In particular, experiments were aimed at quantifying the effectiveness of very long laps in transferring forces between two lapped bars. The 3PB tests were aimed at investigating whether anchorage capacity of laps is enhanced at high shear locations.
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Acknowledgements
The research work disclosed in this publication is partially funded by the REACH HIGH Scholars Programme – Post-Doctoral Grants. The grant is part-financed by the European Union, Operational Programme II – Cohesion Policy 2014-2020 “Investing in human capital to create more opportunities and promote the wellbeing of society - European Social Fund”. The authors would like to thank The Concrete Centre for its financial and technical support and, in particular, Mr Charles Goodchild. The help received from the Structures Laboratory technicians in the Department of Civil and Environmental Engineering at Imperial College London, in particular Mr. Les Clark, is acknowledged.
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Micallef, M., Vollum, R.L., Izzuddin, B.A. (2018). Investigating the Need for Long Laps in Reinforced Concrete Elements. In: Hordijk, D., Luković, M. (eds) High Tech Concrete: Where Technology and Engineering Meet. Springer, Cham. https://doi.org/10.1007/978-3-319-59471-2_178
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DOI: https://doi.org/10.1007/978-3-319-59471-2_178
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