An application of impact-response analysis on small-scale RC arch-type beams without stirrups

To establish a rational impact response simulation method for arch-shape RC beams, the applicability must be confirmed by conducting falling weight impact loading tests of small-scale arch-shape RC beams. However it is not easy to conduct the experiments because of preparing of specimens and fitting of experimental setup. Numerical simulation method may be one good choice, if the accuracy is guaranteed. Because, now a days, impact response analysis for RC members can be performed by using computers. In this paper the applicability of impact response simulation method for arch-shape RC beams has been discussed by comparisons with experimental results. From this study, the following results are obtained: (1) the impact force time history, maximum displacement at the loading point and crack patterns caused in the side-surface of the arch beams can be simulated, which are in good agreement with the experimental results; however, (2) the damped free response after unloading and residual displacement cannot be better simulated.

► Numerical and experimental results are in good agreement; however, the numerical impact forces results tend to be smaller than experimental ones.
► The mid-span displacement time history is in good agreement, but the residual displacement is about 1.5–2.0 times more than the experimental ones.
► The crack pattern near the crown area can be similar. However, the damage obtained from the numerical method near the footing and sidewall are larger.
► These results may be due to the differences between the boundary conditions at the base foundation or footing.