Force Transfer Mechanism Analysis of CFRP-concrete Two-way Composite Slab Connected without Gap under Vertical Load
In order to solve the problems of protruding steel bars in the prefabricated bottom slab of prefabricated concrete composite slabs and complex on-site construction,a method of pasting CFRP strips across the bottom joint of the slab based on the research of ordinary closely assembled composite slabs is proposed in this study.By conducting static load comparative tests and finite element simulation analysis on 6 rectangular single seam tightly jointed bidirectional composite slabs with simple supports on all four sides,the load transmission mechanism at the joint of the composite slab was studied.The results show that compared with ordinary composite slabs connected without gap,pasting CFRP at the joint position can effectively help the concrete at the joint transfer stress to both sides;The force transfer mechanism at the joint of CFRP-concrete two-way composite slabs varies with the increase of load.In the initial stage of load holding,the joint is mainly composed of CFRP at the bottom that transmit force to the concrete on both sides.As the load increases,the additional steel bars enhance their ability to transmit load to both sides,but the CFRP still bear the main tensile stress.In the later stage of loading,after the CFRP off,additional steel bars and truss steel bars,bottom longitudinal bars,form a new force transmission system at the joint.
CFRPconnected without gapcomposite slabsmechanism of force transferstatic testfinite element analysis
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