Determination of Period of RC Buildings by the Ambient Vibration Method

Table 4

Comparisons of period/height ratios in average.

	Set 1 before infill wall	Set 1 with infill wall	Set 2 before retrofit	Set 2 after retrofit
Average period/height ratio	0.0240	0.0190	0.0300	0.0240
Standard derivation	0.0115	0.00404	0.00843	0.00703
Decrease on period/height ratio (%)	21		20