Numerical Simulation Of Impact Failure Of Pre-stressed Stick Steel Reinforced Concrete Beam

The impact failure of the pre-stressed steel reinforcement concrete beam isnumerically simulated when it is subjected the impact load. Using the ANSYS/LS-DYNAdynamic analysis software, the separate finite element models of the reinforced concretebeam with fixed boundary conditions at both ends and the pre-stressed steel reinforcementconcrete beam model are built. The concrete model is defined as the Holmquist-Johnson-Cook model and steel plate is defined to be the kinematic hardening model.Using falling temperature method to pre-stressed the steel. The impact damagecharacteristics of the reinforced concrete beam under different conditions are analyzed.The main work in this thesis includes:Based on the design and calculation of the bending components, the dimension of thebeam, reinforcement status and the maximum thickness of the steel plate are confirmed.Using three dimensional finite element method, the separate finite element models of theconcrete beam, steel and steel plate are built. The models and parameters of the materialsand the failure criterion of the concrete are provided.Based on the developed model, the mechanical behavior of the concrete beam beforeand after reinforced is analyzed. The analysis contents the change of the speed of theimpact block to the beam, stress wave propagation characteristics of the beam, stress anddeformation of the pre-stressed steel plate, the change of the total energy and the impactdamage of the beam. Through the research, the effect of the pre-stressed steelreinforcement concrete beam’s flexural deflection under different conditions is derived.Based on the analysis, the conclusions are reserved: comparing with the traditionalsteel plate reinforced method, the pre-stressed steel reinforcement can limit the generatingof the cracks in the tensile area at the bottom of the reinforced concrete beam. At the earlyperiod of the impact process, the pre-stressed steel reinforcement can improve theperformance of the bending deformation of the beam and increase the bearing capacity ofthe reinforced concrete beam which achieves a better effect comparing with increasing thethickness of the steel plate. Therefore, selecting suitable thickness of the steel plate and giving a appropriate pre-stress can compress the concrete at the bottom of the reinforcedconcrete beam. It can fully use of the reinforcement steel plate’s strength, perform better inthe deflection of the reinforced concrete beam and increase the ability of beam’s resistanceto impact damage.