Abstract

AbstractUsing ultrahigh-performance fibre-reinforced concrete (UHPFRC) for reinforcement lap splice field connections simplifies construction details, reduces on site labour work and overall enhances connection performance and durability. Existing design equations for determining the required development length for normal concrete cannot be used for fibre-reinforced concrete. This paper presents the development of a refined nonlinear finite element model at rib-scale using the 3D concrete constitutive model EPM3D implemented in ABAQUS which enables explicitly expressing the bond performance of lap splices in UHPFRC according to the tensile properties of the concrete, the cover thickness and the bonded length. The numerical results show accurate simulation of the maximum strength, splitting failure mode, crack pattern, and steel stress distribution over the bonded length from different configurations of experimental bond tests. This methodology illustrates the value of nonlinear finite element analysis toward the harmonization of a bond test configuration and its contribution into the development of design guidelines for UHPFRC lap splice connections.KeywordsNonlinear analysisFinite elementUHPFRCBond

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