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Experimental study on bond behavior of longitudinal reinforcement in modified recycled concrete beam column joints under cyclic loading

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Document pages: 13 pages

Abstract: In order to study the bond performance of longitudinal reinforcement at recycled concrete beam column joints, cyclic load tests were carried out on three recycled concrete beam column joints (including two modified recycled concrete beam column joints with 15 fly ash replacement rate). The load strain hysteretic curve of longitudinal reinforcement is obtained. The relative bond strength of longitudinal reinforcement in each characteristic stage is calculated. The test results show that the longitudinal reinforcement in RAC joint can provide stable bond stress in both complete cracking stage and ultimate stage, which means that the requirements of stress transfer and displacement coordination between Rac and reinforcement can be met. The larger the bar diameter, the larger theore serious the bond strength degradation. The RAC with fly ash can improve the interface compactness and bond strength of recycled aggregate in full crack stage. When beam-column interface of concrete compression zone reaches ultimate strain, the compressive stress of the longitudinal reinforcement cannot be exerted. The bond stress of the steel bar cannot realize the pull and compressive stress conversion in the length of the core area of the joint owing to the stress hysteresis of the compression rebars.

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