Fiber reinforced polymer(FRP)bar reinforced concrete structure has a promising prospect in civil engineering,but currently it is still lack of research on the cyclic behavior.This paper theoretically investigated the bond behavior between basalt FRP and recycle concrete under cyclic loads and proposed constitutive models for the stress-slip relationship.Based on the experimental results of pull-out specimens under static and cyclic loads,the effects of BFRP bar diameter,fatigue stress levels and cycling times on the bond behavior were analyzed.The constitutive model for BFRP bar-concrete cyclic bonding was consisted of the model under cyclic load and the model under static pull-out load.During the cyclic loading process,the cyclic bond stress-slip curve is mainly governed by the cyclic bond stiff-ness and the slip at unloading point.It was found that the initial bond stiffness,fatigue stress level and cycling times could affect the cyclic bond stiffness.The change of cyclic bond stiffness could be simulated by using an exponential function.The bond slip during cyclic loading is mainly related to the fatigue stress level.Therefore,a constitutive model was proposed for the bond stress-slip relationship of specimens under cyclic load,in which the effect of cyclic load was considered.After the complete of cyclic loading,the specimen was in the stage of static pull-out stage.It was found that the cyclic loading history did not obviously affect the bond behavior in this stage and the conventional model for static bonding is still applicable.In the end,the reasonability and accuracy of the proposed model were veri-fied by the experimental results.
FRP bar reinforced concrete structuresconstitutive modelbonding theorycyclic loadbond stress-slip curve
维普
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