Numerical Simulation On Concrete Strain Rate Effect On Bond-slip Performance

The bond-slip problems in reinforced concrete structures have great significance in the study. In recent years, many scholars in the study of nonlinear finite element analysis of reinforced concrete is committed to the bond-slip between steel and concrete experimental study and numerical simulation, although they have achieved fruitful research results, but mostly limited to the ordinary reinforced concrete under static load of the bond anchorage problems, less research about the performance under the earthquake function of dynamic load and strain rate of concrete effects on bond-slip performance. This article adopts the numerical simulation research on bond-slip and the influence of different concrete strain rate on the bond-slip performance.Using Abaqus software to establish finite element model, simulating the experiment research result of Yang Fulin who research on the bonding strength between steel and concrete and the bearing capacity relationship study of reinforced concrete beam.Using the nonlinear spring element Spring2 simulate the bond-slip between steel and reinforced concrete, based on the different working conditions without considering concrete strain rate analyse bond-slip performance in finite element analysis method, and compare the simulation results with the test results, the results show that the numerical simulation results and the theoretical results fit well with experimental results.Without considering the influence of stirrup, this paper has also established a new model of single steel rectangle cross section beam, research the influence of different strain rate of concrete under earthquake on the bond-slip performance. And analyse the influence of different strain rate of the concrete on the bond-slip performance. Numerical simulation results show that under the step by step loading different strain rate of concrete have no effect on the maximum cohesive force, the maximum slippage and the bond-slip curve.But affecting stress along the steel bar length direction, stress rate increasing with the increase of strain rate along the steel bar length direction.