The following calculations are available:
Web stability for shear
- Each panel (the space between neighboring ribs) is analyzed at 11 points to find the greatest value of the shearing force. For the identified force, it carries out verification according to paragraph (7)
- The results are presented for each panel at the points where there appeared the most straining stresses.
Web stability for compression (8)
- Verification of the web under a concentrated force is carried out only when the force is applied to a point where there is no rib (the web is not ribbed)
- An analysis is run to determine if the force or reaction results in web compression. The compression effect results from a force (reaction or an adjoining bar) in the following cases:
- A force (reaction or an adjoining bar) at the top and the negative force (reaction) value
- A force (reaction or an adjoining bar) at the bottom and the positive force (reaction) value. Otherwise, calculations are not run (the force is disregarded)
- Calculations are carried out for all load cases defined by the user in the Automatic loads field
- If there are several concentrated forces (within one load case) they are automatically added
- In the case of a combination or code combination, if there are several forces originating from different load cases, they are added while recognizing at the same time the relevant combination coefficients
- The results are provided for each force that results in compression of the web without ribs.
NTM interaction (9)
- Robot analyzes each panel at 11 calculation points
- Calculations are carried out for all load cases as defined in the Automatic loads field
- Results are shown for the point of a panel where there appears the most straining stress.
Compressed flange stability (10)
- Compressed flange stability is verified at 3 equidistant points (flange beginning, center and end)
- The geometrical condition of the compressed flange stability is verified according to the formula (10.1).
Transversal stiffener stability (11)
- The check is carried out at the points where stiffeners are located
- If a concentrated force is applied directly to a rib, the force itself will be taken for verification. If no concentrated force is applied directly to a stiffener, the force that compresses the stiffener is calculated and does so on the basis of formula (5.63). If the concentrated force results in stretching the stiffener, then calculations for the stiffener are not performed
- Multiple forces applied to a stiffener are combined in an analogous manner as in the case of concentrated forces applied to a web without stiffeners.