230 / 2022-06-13 19:02:27

Bond behavior of deformed bars in steel-polyethylene hybrid fiber engineered cementitious composites under monotonic and cyclic loading

bond behavior,engineered cementitious composites,hybrid fiber,monotonic and cyclic loading

The bond performance between rebar and steel-polyethylene hybrid fiber engineered cementitious composites (HECC) plays an important role in evaluating the static and seismic behavior of reinforced HECC structures. To understand the bond behavior between the HECC and rebar, direct pullout tests were conducted to systematically investigate the effects of rebar diameter d, anchorage length la, cover thickness c and fiber type on the bond performance between rebar and HECC under static and cyclic loading procedures. A simplified bond-slip constitutive model for rebar embedded in HECC was proposed, and the design anchorage length of the rebar embedded in HECC was suggested based on a reliability analysis under static loading. Then, the effects of design parameters on bond strength under monotonic loading, degradation laws of bond strength, bond stiffness, and energy dissipation capacity under cyclic loading were discussed. Furthermore, the positive influence of hybrid fiber synergic effect on the bond strength, bond stiffness, energy dissipation capacity of HECC was stressed.