Static and Dynamic Mechanical Properties of Long-Span Cable-Stayed Bridges Using CFRP Cables

Table 5

Dynamic performance of the two cable-stayed bridges.

Frequency (Hz)								Modal characteristics
CFRP cable-stayed bridge				Steel cable-stayed bridge
Order	With initial stress	Without initial stress	The difference (%)	Order	With initial stress	Without initial stress	The difference (%)
1	0.1012	0.1067	5.4	1	0.0988	0.1045	5.8	Longitudinal floating +; vertical bending of pylon
2	0.1290	0.1292	0.2	2	0.1248	0.1253	0.4	First lateral lending
3	0.2028	0.2046	0.9	3	0.2075	0.2095	1.0	First vertical bending
4	0.2493	0.2529	1.4	4	0.2575	0.2614	1.5	Second vertical bending
5	0.3403	0.3429	0.8	5	0.3338	0.3366	0.8	Second lateral bending
6	0.3463	0.3556	2.7	6	0.3546	0.3640	2.7	Third vertical bending
7	0.4227	0.4352	3.0	7	0.4346	0.4470	2.9	Fourth vertical bending
8	0.4493	0.4621	2.8	10	0.4612	0.4738	2.7	Fifth vertical bending
9	0.4776	0.4792	0.3	8	0.4568	0.4594	0.6	Synchrony lateral bending of pylon
10	0.4800	0.4816	0.3	9	0.4586	0.4612	0.6	Reverse lateral bending of pylon
11	0.5154	0.5325	3.3	11	0.5318	0.5486	3.2	Sixth vertical bending
12	0.5277	0.5412	2.6	13	0.5529	0.5675	2.6	Vertical bending
13	0.5533	0.5625	1.7	12	0.5432	0.5529	1.8	First torsion + lateral bending
14	0.5703	0.5855	2.7	14	0.5595	0.5743	2.6	Reverse lateral bending of pylon + torsion
15	0.5906	0.6081	3.0	16	0.6160	0.6338	2.9	Vertical bending
16	0.5912	0.5949	0.6	15	0.5816	0.5849	0.6	First torsion