Vibration Isolation of Existing Buildings in Microvibration Traffic Environment

Table 1

Vibration of the midspan and wall-floor junction of typical rooms before and after isolation (dB).

Room	Midspan			Wall-floor junction
Floor	Before isolation	After isolation	Reduction	Before isolation	After isolation	Reduction
SN2
First	58.93	56.87	2.06	55.26	52.95	2.31
Second	59.20	56.94	2.26	56.00	53.88	2.11
Third	59.84	57.67	2.17	57.44	55.55	1.89
Fourth	60.22	57.45	2.77	58.50	56.67	1.83
Fifth	60.57	57.31	3.26	59.16	57.35	1.81
C2
First	58.31	54.28	4.03	55.04	52.72	2.32
Second	58.56	55.45	3.11	56.58	54.29	2.29
Third	59.89	57.47	2.42	58.30	56.18	2.12
Fourth	61.04	58.62	2.41	59.35	57.26	2.09
Fifth	61.66	59.30	2.36	59.89	57.82	2.08
W2
First	56.07	54.59	1.48	54.96	53.86	1.10
Second	56.71	54.89	1.82	55.66	54.00	1.65
Third	57.78	55.72	2.06	56.77	54.87	1.90
Fourth	58.38	55.54	2.84	57.67	55.64	2.04
Fifth	59.14	55.96	3.18	58.32	56.20	2.12