Behavior of Jointed Portion of Strengthened RC Beams by Attaching Lattice-Form CFRP with a Joint and Shotcreting Polymer Cement Mortar

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  • アンカーと継手部の補強が異なる格子状CFRPで下面増厚補強したRCはりの力学的性状

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The mechanical performance of many RC road bridge slabs constructed over the past several decades is decreasing. The application of the depth thickening method to the lower part of slabs is promising in terms of enhancing the mechanical behavior of damaged slabs. This research examines the damaged RC beam strengthening effect obtained by attaching a lattice-form CFRP with a joint and shotcreting polymer cement mortar. To study the mechanical behavior of RC beams attached with these reinforcing materials, static loading tests were performed with a number of variables such as the type of mechanical fastener, the number of rivets used for the purpose of fixation of the CFRP, the lattice number and length of jointed CFRP, the mechanical shotcreting methods of jointed part, and the type of polymer mortar. It is clear from the experimental results that the use of lattice-form CFRP for strengthening RC road bridge slabs is highly effective, especially when using a sufficient number of rivets that are well distributed, jointed CFRP, and a professional system for applying good-quality polymer mortar.

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