Study on Concrete Pier Impact Performance after Implementing Equal Cross-Section Stainless Steel with Protection from Closed-Cell Aluminum Foam

Table 7

Test results and comparison of the top displacements.

Height of the drop hammer (m)	Average impact velocity (m/s)	1^st group			2^nd group
		Displacement peak values (mm)		Relative ratio (%)	Displacement peak values (mm)		Relative ratio (%)
		S1-16	Z2-16		S1-20	Z2-20
2	0.72	10.19	13.02	21.74	10.98	13.94	21.23
4	1.10	17.79	22.9	22.31	13.15	16.74	21.45
6	1.42	32.11	41.78	23.15	20.75	26.99	23.12
8	1.67	41.76	66.91	37.59	32.1	48.13	33.31
10	1.84	54.33	93.92	42.15	46.49	70.69	34.23
12	2.08	70.13	121.31	42.19	57.55	87.34	34.11