Shear failure analysis on ultra-high performance concrete beams reinforced with high strength steel

    Authors

    J. Xia; K. R. Mackie; M. A. Saleem;A. Mirmiran

    Comments

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    Abbreviated Journal Title

    Eng. Struct.

    Keywords

    Bond strength; Passive reinforcement; Shear reinforcement; Dowel action; Moment-shear interaction; COMPRESSION FIELD-THEORY; TRANSVERSE REINFORCEMENT; MODEL; MEMBERS; Engineering, Civil

    Abstract

    A new deck system for moveable bridges was developed that makes use of ultra-high performance concrete (UHPC) reinforced with high strength steel (HSS) rebar to achieve the light weight and high strength requirements in moveable bridge applications. However, the typical deck strips of this deck system failed predominantly due to shear cracks in simply supported beam proof tests. This paper investigates the mechanism of the deck strip shear failure experimentally and analytically. Experimental studies were performed at several scales, including material characterization, bond strength tests, small-scale prism tests, and full-scale beam tests. Specimens with traditional shear strengthening techniques were also tested. Several existing formulas were utilized to predict the shear strength, and the results were compared to the experimental results. The accuracy and limitations of these formulas are discussed. The shear failure of UHPC-HSS beams is not characterized by brittle response or catastrophic load reduction as with normal reinforced concrete. Therefore, this particular shear failure mode is regarded as acceptable. However, the additional shear resistance caused by the localized deformation of the longitudinal reinforcement is not recommended to be considered for design capacity formulas. (C) 2011 Elsevier Ltd. All rights reserved.

    Journal Title

    Engineering Structures

    Volume

    33

    Issue/Number

    12

    Publication Date

    1-1-2011

    Document Type

    Article

    Language

    English

    First Page

    3597

    Last Page

    3609

    WOS Identifier

    WOS:000297823200045

    ISSN

    0141-0296

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