204976.fig.001a
(a)
204976.fig.001b
(b)
Figure 1: (a) Picture of the experimental site with the heavy load (iron ball) suspended at the height of 1 m over the beam. (b) Example of a frame acquired by HFI FLIR camera. The frame depicts the heavy load just before the impact on the concrete beam. The black arrow indicates the mixed pixels (i.e., background and beam) used for calculating the oscillation frequency after the impact.