The grouted splice sleeve connector system takes advantage of the bond-slip resistance of the grout and the mechanical gripping of reinforcement bars to provide resistance to tensile force. In this system, grout acts as a load-transferring medium and bonding material between the bars and sleeve. This study adopted the end-to-end rebars connection method to investigate the effect of development length and sleeve diameter on the bonding performance of the sleeve connector. The end-to-end method refers to the condition where reinforcement bars are inserted into the sleeve from both ends and meet at the centre before grout is filled. Eight specimens of grouted splice sleeve connector were tested under tensile load to determine their performance. The sleeve connector was designed using 5 mm thick circular hollow section (CHS) steel pipe and consisted of one external and two internal sleeves. The tensile test results show that connectors with a smaller external and internal sleeve diameter appear to provide better bonding performance. Three types of failure were observed in this research, which are bar fracture (outside the sleeve), bar pullout, and internal sleeve pullout. With reference to these failure types, the development length of 200 mm is the optimum value due to its bar fracture type, which indicates that the tensile capacity of the connector is higher than the reinforcement bar. It is found that the performance of the grouted splice sleeve connector is influenced by the development length of the reinforcement bar and the diameter of the sleeve.
Cold-formed profiled steel decking composite slab is one of the most widely used system of slab after conventional concrete slab for building structure. It is cost effective, straightforwardly designable and readily available in the market for construction. However due to modern architectural desire of large span building, this system weakness that is the requirement of temporary propped support may have an impact toward its cost effectiveness. Generally more propped support are required with the increase of slab span design.This paper present the result of laboratory test on the behavior of reinforced profiled steel decking under loading to increase the span for unpropped composite slabs construction. The load capacity of the steel decks was amplified by reinforcing cold formed C channel on the top flange of steel decks. The experimental program comprises 12 full-scale tests of three length with a set of modification of profiled steel decking using cold formed C channel.The result shown experimental evidence of the role played by the cold formed C channel on altering the cross section properties which supporting the bending capacity of the steel decks. The flexural response of the steel deck was examined using the LVDT instruments to capture the deformation at three points. The finding delivered by the experimental data for the performance of reinforced profiled steel decking are set as the base for the future verification of finite element model.
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