Dowel action and shear strength contribution of high strength rebar embedded in ultra-high performance fiber reinforced concrete

Author(s): Y. Xiao, J. Xia, K. Mackie, A. Mirmiran
Paper category: Symposium
Book title: RILEM-fib-AFGC International Symposium on Ultra-High Performance Fibre-Reinforced Concrete
Editor(s): F. Toutlemonde, J. Resplendino
Print ISBN: 978-2-35158-130-8
e-ISBN: 978-2-35158-131-5
Publisher: RILEM Publications S.A.R.L
Pages: 567 – 576
Total Pages: 10
Language: English

Dowel action influence is usually ignored during normal reinforced concrete beam designs since vertical shear reinforcing bars always offer significant shear resistance. However, for Ultrahigh Performance Concrete (UHPC) beams without shear reinforcement, the dowel action contribution to the shear strength becomes considerable. Its contribution is also important in assuring a non-brittle type of shear failure. The embedded longitudinal rebar can bridge the bottom cracks and transfer the shear force by bearing on concrete core one side and supported by the UHPC in tension on the other side. A series of notched reinforced dowel specimens were tested to verify the contribution from dowel action with interfacial bond between UHPC and rebar eliminated by using plastic tubes around embedded rebar in UHPC. Important dowel action contributions parameters were obtained and the load versus displacement curve was used to calibrate beam on elastic foundation and finite element models.

Online publication: 2014
Publication Type: full_text
Public price (Euros): 0.00

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