3. Modeling A

3.1. Characteristics of modeling

3.2. Characteristics of the mesh

Number of knots: 241

Number of meshes and type: 72 TRIA7

3.3. Tested values

Identification	Instants	Reference	Aster	% difference
Limit point no. 1
DZ	1.03	—0.0140	—0.0140	—0.01322	—5.573
Eta_ PILOTAGE	1.03	1.0	0.9729	—2.471
Endpoint No. 2
DZ	1.78	—0.0171	—0.0171	—0.01696	—0.847
Eta_ PILOTAGE	1.78	0.375 0.250	0.07513	—75.96
Endpoint No. 3
DZ	2.3	—0.0140	—0.0140	—0.01458	4.176
Eta_ PILOTAGE	2.3	—0.400 —0.492	—0.533	19.67
Endpoint No. 4
DZ	2.48	—0.0161	—0.01617	0.452
Eta_ PILOTAGE	2.48	—0.633	—0.6442	1.717

3.4. notes

The calculation strategy used is divided into two steps:

• calculation under imposed load up to \(P=582.N\) corresponding to 97% of the critical load,

• « imposed displacement » calculation: then, an imposed displacement is imposed using the technique of the arc length imposed on the entire structure (option LONG_ARC in STAT_NON_LINE).

Using the arc-length technique makes it difficult to define the reference value to be entered in the TEST_RESU command, since these values cannot be imposed. To define the reference values, we looked for the values of \(\mathit{DZ}\) that were as close as possible to those listed in the table in [§2.2] and we reported the values of the control parameter that we had to obtain for the values of \(\mathit{DZ}\) in question.