Strength Analysis Modelling of Flexible Umbilical Members for Marine Structures

Table 3

Comparing full-scale tests to analysis. Measurements denoted (M), simulation results (S) and measurement to simulation ratio (R). Average value and standard deviation are given for the ratio parameter.

		Umbilical no.									Avrg.	Std.
		1	2	3	4	5	6	7	8	9
EA under tension (MN); torsion fixed	M	609	—	—	206	194	209	466	136	366	—	—
	S	630	—	—	202	191	232	529	168	406	—	—
	R	0.97	—	—	1.02	1.02	0.90	0.88	0.81	0.90	0.93	0.08
EA under tension (MN); torsion free	M	565	466	261	190	—	201	474	114	366	—	—
	S	606	538	281	172	—	215	529	141	406	—	—
	R	0.93	0.87	0.93	1.10	—	0.93	0.90	0.81	0.90	0.92	0.08
Coupling (rad/m); (torsion/axial strain)	M	—	−39	9.5	35.2	—	—	—	—	—	—	—
	S	—	−36	7.1	38.2	—	—	—	—	—	—	—
	R	—	1.08	1.34	0.92	—	—	—	—	—	1.11	0.21
GJ clockwise (kNm^2)	M	339	48	65	12.9	4.7	35.5	50.5	3.85	48.5	—	—
	S	288	41	64	14.1	4.2	32.6	48.8	3.94	52.9	—	—
	R	1.18	1.17	1.02	0.91	1.12	1.09	1.03	0.98	0.92	1.05	0.10
Coupling clockwise (10^−3 m/rad); (axial strain/torsion)	M	—	−3.9	2.2	3.1	2.4	—	—	2.3	—	—	—
	S	—	−3.0	1.8	3.5	2.8	—	—	2.2	—	—	—
	R	—	1.30	1.22	0.89	0.97	—	—	1.05	—	1.09	0.17