Numerical simulation analysis for RC shear walls under impact load

In order to study performances of reinforced concrete (RC) walls under impact load, the software LS-DYNA was used to establish a finite element (FE) model, and simulate the existing tests. The simulation results agreed well with the test data to prove the correctness of the established model. Then the LS-DYNA FE model for 28 RC shear walls divided into 7 groups under impact load was established to analyze effects of impact energy, impact mass, axial compression ratio and reinforcement ratio on anti-impact performance of RC shear walls. The results indicated that when impact mass keeps unchanged, impact energy and the maximum displacement at middle of walls have a linear growing relation; when impact energy keeps unchanged, change of impact mass affects impact energy distribution in reinforcement and concrete; with decrease in impact mass and increase in impact velocity, concrete local damage increases, energy absorbed by reinforcement decreases, and decrease in energy dissipated by deformation causes displacement to decrease; when axial compression ratio is less than 0.3, axial force is beneficial to walls' anti-impact ability, so axial force can be ignored in the case of small axial compression ratio for wall design with results on safe side. Finally, the design method based on energy was discussed, and the design idea using the static design method of wall plate's plastic hinge lines to resist corresponding impact energy was proposed, the design flow path was summed and recommended values of parameters in formulas were given. © 2019, Editorial Office of Journal of Vibration and Shock. All right reserved.