DYNAMIC BOND BEHAVIOR OF GFRP SHEET-CONCRETE INTERFACE UNDER IMPACT LOADING

摘要

Glass fiber reinforced polymer(GFRP)sheet/plate is widely used in reinforced concrete structures.Existing studies show that the bond behavior of FRP sheet-concrete plays a key role in FRP reinforced system.However,most of the researches focus on the bond behavior of GFRP sheet-concrete interface under static loading.The dynamic bond behavior of GFRP sheet-concrete interface in shear was experimentally investigated with the drop-mass impact test method in this paper.The test results showed that strain distribution gradient of GFRP sheet under impact loading was greater than that under static loading,and the dynamic shear stress should be larger than the static shear stress.Additionally,the ultimate load of GFRP sheet-concrete interface increased obviously due to strain rate effect and the effective bond length decreases slightly.