Evaluation of Seismic Response Trends from Long-Term Monitoring of Two Instrumented RC Buildings Including Soil-Structure Interaction

Table 4

Summary of identified frequencies for buildings A and B for pseudoflexible and flexible base models.

Building		Pseudoflexible base				Flexible base
	Mode	Frequency (Hz)				Frequency (Hz)
		Min.	Max.	Avg.	% change	Min.	Max.	Avg.	% change
Building A	1st	3.07	3.52	3.37	13%	3.02	3.50	3.33	14%
	2nd	3.36	3.87	3.67	14%	3.21	3.88	3.61	19%
	3rd	3.57	3.92	3.80	9%	3.48	3.90	3.79	11%
Building B	1st	2.91	3.63	3.33	22%	2.85	3.51	3.28	20%
	2nd	3.28	4.06	3.80	21%	3.22	4.16	3.79	25%
	3rd	3.53	4.63	4.14	27%	3.44	4.62	4.11	29%