Experimental and numerical study on the dynamic response of steel-reinforced concrete composite members under lateral impact

摘要

This paper investigates the dynamic response of steel-reinforced concrete (SRC) composite members under lateral impact using experimental and numerical studies. A total of 11 specimens composed of structural steel encased in reinforced concrete were tested under drop hammer impacts. The dynamic responses of SRC members including damage observations, impact force, and mid-span displacement were obtained and analyzed with emphasis on the effect of impact velocity, boundary condition, and axial load. It was found that the specimens failed in a shear-flexural response and impact velocity played a significant role in determining the dynamic response of SRC members. It was also found that the amount of residual displacement was linearly proportioned to the displacement ductility. Followed by the experimental study, a finite element analysis (FEA) model was established and verified based on the test results. The distributions of impact energy among different components are obtained using FEA models. It was found that the energy dissipation was dominated by concrete rather than structural steel or reinforcement. However, with the increase in impact energy, the percentage of energy dissipation in the structural steel increases, meaning that encasing structural steel in concrete elements is an effective method to improve impact resistance.