Abstract
The implementation of precast concrete and recycled aggregate concrete (RAC) for construction could achieve the purpose of high efficiency and environmental benefit. In this paper, an innovative type of precast recycled fine aggregate (RFA) concrete beam-column joint with pressed sleeve connections is introduced and investigated through experimental study, in order to explore the potential of employing RAC and pressed sleeves in new precast concrete construction. The upper and lower concrete columns and the two precast beams were prefabricated in factory using RAC, then they were assembled on-site by using pressed sleeves to connect the longitudinal reinforcements in columns. Ten 2/3-scale specimens were designed according to the current Chinese code, and were manufactured and tested under cyclic loadings. Different longitudinal reinforcement ratio (ρb = 1.03%, 1.71% and 2.09%) for beams, various replacement ratio of RFA (ω = 0, 30% and 70%) in precast concrete, different axial compression ratio (nd = 0.2 and 0.5) for joints and two manufacturing methods (precast or cast-in-situ) were considered in the specimen design. Experimental results proved the desirable performance of the proposed connection using pressed sleeves, as well as the feasibility of using recycled fine aggregate concrete in the precast elements for the beam-column joints. Most of the specimens in the experiment were subjected to beam flexure failure. The failure mode, hysteretic behaviour, skeleton curves, bearing capacity, deformation capacity, stiffness and energy dissipation of the precast beam-column joints were similar as those of the conventional monolithic cast-in-situ counterpart. The analytical methods for predicting the flexural capacity of beams in the joint and the shear capacity of core joint were recommended. The results predicted by the analytical methods had satisfactory agreement with the experimental results, which provides a reference for future further theoretical research.
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