Fundamental Analysis of RC lap Splices


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Title: Fundamental Analysis of RC lap Splices

Author(s): T. Ichinase, T. Hayashi and W. Lin

Publication: Special Publication

Volume: 180


Appears on pages(s): 431-458

Keywords: Analysis; bond (concrete to reinforcement); cracking (fracturing); epoxy coating; fracture; friction; stirrup; strength

Date: 10/1/1998

An analytical model is presented to evaluate the local bond-slip relationship in RC lap splices considering the influence of splitting cracks, friction between the concrete and rib face, microscopic fracture of concrete in front of rib face, flexural deformation of the cover concrete, and stirrups. The local bond-slip relationship is integrated along the splice length considering the strain in the concrete in the longitudinal direction. It is shown that the lack of friction at a rib face due to epoxy coating reduces the ductility of the local bond slip relationship without stirrups, resulting in lower splice strengths. The contribution of stirrups to the splice strength is dominated by the flexural strength of the cover concrete with stirrups, and is the function of concrete strength rather than the yield strength of the stirrup.