A New Insight to Vibration Characteristics of Spans under Random Moving Load: Case Study of 38 Bridges in Ho Chi Minh City, Vietnam

Table 10

Natural frequencies of Ong Nhieu bridge.

Ong Nhieu				Frequencies (Hz)
Spans	Measurement times	Measurement directions	Traffic states
1	1	x	Minivans, cars, dumper trucks,…, 8 h 35 : 9 h 10 am, 17/6/2011	4.8
		z		10.3
	2	x	Trucks, buses,…, 9 h 5 : 11 h am, 10/10/2011	4.8
		z		10.5
	3	x	Minivans, cars, dumper trucks,…, 11 h: 12 h 20 am, 25/12/2011	4.9
		z		10.3
	4	x	Minivans, cars, dumper trucks,…, 8 h: 90 h 45 am, 20/4/2012	4.8