Title: Seismic Resistant Precast Concrete Beam-Column Joints Incorporating Ductile Fibre Reinforced Connect

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Publication: CIA

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Date: 2/13/2011

Abstract:
Two equivalent monolithic precast concrete beam-column joints constructed with in-situ concrete connections in the joint core regions were subjected to simulated earthquake loading. Shear strength in the joint core was provided by ductile fibre reinforced cementitious composites (DFRCC) instead of conventional transverse reinforcement, significantly reducing reinforcement congestion and thus simplifying construction. Although DFRCC is expensive compared to ordinary concrete, the small volume of the connection and the ease of construction make this construction method a practical alternative for real structures. The two beam-column joints differed only in the reinforcement detail used in the joint core. Both test units performed well until very high drift and ductility levels were reached. The eventual cause of failure of the beam-column joints differed depending on the reinforcement detail used to anchor beam reinforcement in the joint core, with failure occurring due to buckling of reinforcement in the plastic hinge regions when hooked anchorages were used, or due to shear failure of the joint core when straight anchorages were used. Strut-and-tie models were used to examine the reasons for the different performance of the two joint cores, from which it was concluded that joint shear failure was a result of greater reliance on force transfer by direct tension stresses when straight reinforcement anchorages were used.