Effects of CFRP Strengthening on Dynamic and Fatigue Responses of Composite Bridge

Table 3

A comparison of natural frequency of the bridges.

Number of steel girders	Type of composite bridges	Natural frequency (Hz)		Percent difference (%)
		From (4) and (5)	From FE model
3	Unstrengthened/strengthened; with CFRP sheets	7.894	7.794	1.27
	Strengthened with CFRP deck	10.476	10.423	0.51
5	Unstrengthened/strengthened; with CFRP sheets	9.398	9.324	0.79
	Strengthened with CFRP deck	11.106	10.921	1.67