Dynamic Analysis of Deep Water Highway Tunnel under Ocean Current

Table 5

Natural vibration frequencies of structures with different span lengths (D = 20 m).

Diameter (m)	Span length (m)	Width-span ratio	Frequency (Hz)
			1^st	2^nd	3^rd	4^th	5^th	6^th
20	100	0.200	1.1554	2.5646	2.8787	3.3667	4.0364	5.6344
	150	0.133	0.90607	1.2315	1.4076	1.9517	2.5616	2.972
	200	0.100	0.66682	0.71533	0.8294	1.209	1.7053	2.2106
	300	0.067	0.34852	0.40492	0.46432	0.57254	1.1229	1.2915
	400	0.050	0.2076	0.24639	0.29847	0.32926	0.70337	0.76766
	450	0.044	0.16769	0.19682	0.24235	0.26155	0.57159	0.61213