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

    Authors

    J. Xia; Y. L. Xiao; K. R. Mackie; M. Al-Ramahee;A. Mirmiran

    Comments

    Authors: contact us about adding a copy of your work at STARS@ucf.edu

    Abbreviated Journal Title

    Eng. Struct.

    Keywords

    Beam on elastic foundation; Beam on nonlinear foundation; Dowel force; Tension modulus; BEHAVIOR; STEEL; BEAMS; BARS; Engineering, Civil

    Abstract

    The influence of dowel action is usually ignored during normal reinforced concrete beam designs since vertical shear reinforcing bars always offer significant shear resistance. However, for ultra-high performance concrete (UHPC) beams without shear reinforcement, the dowel action contribution to the shear strength becomes considerable and is important in assuring a non-brittle type of shear failure. The embedded longitudinal rebar transfers the shear force by concrete core bearing and UHPC support in tension on alternate sides of the shear crack. A series of notched UHPC dowel specimens were tested to verify the contribution from dowel action. The interfacial bond between UHPC and rebar was eliminated by covering plastic tubes on the embedded rebar. Important dowel action contribution parameters were obtained and the load versus displacement curves were used to calibrate beam on elastic foundation (BEF) and beam on nonlinear foundation (BNF) theoretical models. The experimental and analytical estimates of the peak dowel force are compared with existing equations calibrated for normal strength concrete. (C) 2014 Elsevier Ltd. All rights reserved.

    Journal Title

    Engineering Structures

    Volume

    83

    Publication Date

    1-1-2015

    Document Type

    Article

    Language

    English

    First Page

    223

    Last Page

    232

    WOS Identifier

    WOS:000347363000019

    ISSN

    0141-0296

    Share

    COinS