Shake Table Study on the Efficiency of Seismic Base Isolation Using Natural Stone Pebbles

Table 1

Maximum values of some measured experimental results and their ratios.

Applied excitation	Building model	Horizontal displacement of the block center			Vertical uplift of the foundation			Acceleration of the block center			Strain at the bottom of the column
		Artificial	MSB	150	45	0.30	64	15	0.23	11.6	5.5	0.47	0.055	0.029	0.53
Accelerogram	MSSB	173	107	0.62	39	17	0.44	7.6	4.4	0.58	0.850	0.460	0.53
Accelerogram	MSB	120	85	0.71	51	35	0.69	12.1	5.7	0.47	0.058	0.027	0.47
Petrovac	MSSB	142	80	0.56	28	13.5	0.48	7.6	4.5	0.59	0.870	0.460	0.53
Accelerogram	MSB	16.2	16.5	1.02	6.8	5.5	0.81	6.5	5.2	0.80	0.031	0.023	0.74
Ston	MSSB	33.6	32	0.95	3.2	3.7	1.16	3.7	3.7	1.00	0.415	0.380	0.92
Accelerogram	MSB	12	6.5	0.54	4.4	1.7	0.39	5.8	4.1	0.71	0.025	0.018	0.72
B. Luka	MSSB	21	14.5	0.69	1.4	2.3	1.64	2.8	2.4	0.86	0.320	0.220	0.69

, , , , , and are the maximum values for the rigid base. , , , , , and are the maximum values for the pebble layer.