Title

Simulating the Response of CFRP Strengthened Shear-Keys in Composite Concrete Bridges

Document Type

Article

Publication Date

1-2016

Publication Source

Materials & Design

Volume

90

Inclusive pages

733–744

DOI

10.1016/j.matdes.2015.11.032

Publisher

Elsevier Ltd

ISBN/ISSN

02641275

Peer Reviewed

yes

Abstract

The reduction in the integral action between cast-in-situ slab and precast prestressed concrete girders in composite concrete bridges can be attributed to the increase in truck loads; increase in the allowable stress at service loads; exposure to aggressive environments; and the increase in traffic flow. It is a necessity to restore this integral action by strengthening against horizontal shear. In this paper, a finite element analysis (FEA) was performed considering 32 push off specimens using ANSYS software package to evaluate the behavior of shear-keys of composite concrete bridges. The studied parameters include: the concrete compressive strength, spacing of the shear stirrups, the carbon fiber reinforce polymer (CFRP) sheet spacing, and CFRP plate spacing, fiber angle, and anchorage length. The FEA results show that the reduced crack opening and slip in the strengthened shear-keys compared with the control specimen reflect the efficiency of the CFRP strengthening scheme. Moreover, the FEA results indicate that the CFRP composites anchorage length and angle had a notable impact on the longitudinal shear force and corresponding slip, failure mode, stiffness, and toughness. Finally, an empirical model was proposed for predicting the bond-slip behavior of shear-keys based on reliable experimental results available in literature.

Keywords

Finite element method, Cfrp strengthening, Composite concretes, Concrete compressive strength, Anchorages (concrete construction), Anchorages (foundations), Bond strength (materials), Carbon, Carbon fibers, Compressive strength, Concrete beams and girders, Concrete bridges, Concretes, Prestressed concrete, Steel beams and girders, Aggressive environment, ANSYS software package, Carbon fiber reinforce polymers, CFRP composites, Composite concrete bridges, FEA, Shear-key

Disciplines

Engineering

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