Dynamic Analysis of Deep Water Highway Tunnel under Ocean Current

Table 6

Natural vibration frequencies of structures with different span lengths (D = 15 m).

Diameter (m)	Span length (m)	Width-span ratio	Frequency (Hz)
			1^st	2^nd	3^rd	4^th	5^th	6^th
15	100	0.15	0.92597	1.9591	2.2269	3.0122	3.072	5.1569
	150	0.10	0.73692	0.9308	1.0998	1.6272	1.898	2.9244
	200	0.075	0.55022	0.59316	0.67017	0.96852	1.3962	1.8702
	300	0.050	0.26181	0.31893	0.36445	0.44276	0.85128	1.0218
	400	0.0375	0.1553	0.18946	0.22918	0.25303	0.5329	0.5951
	450	0.033	0.12601	0.15151	0.18604	0.20011	0.4363	0.47561