Internal forces input

The model can be designed for each load case using several internal forces that are available at the individual locations x along the member.

If there are different constellations of internal forces, you can use them

• individually in different load cases,
• on different members in the same load case, or
• at different locations x in the same load case

examine.

The number of the internal force is assigned automatically, but can be changed. The order is irrelevant for the numbering. It does not have to be continuous, either; gaps in the numbering are allowed.

Load case

Select the load case for which you want to define the internal forces from the list.

Member No.

The internal forces are managed by member. You can freely select the number of the member on which the internal forces act.

Internal forces related to

In the list, select whether the internal forces refer to the principal axes u and v of the model or to the input axes y and z, which are parallel to the global axes Y and Z in the centroid.

Venue

Enter the location of the member where the following defined internal forces occur. The input of internal forces does not have to be linked to a specific construction location. You can imagine different internal force combinations for the x-locations for which the model is analyzed.

Internal forces

The image Signconventionforinternalforcesatthepositivesideofthesection shows the sign rules for positive internal forces in RSECTION.

Axial force

Normal forces N are considered acting on the center of gravity S of the model by the program.

A tensile force is positive, a compression force is negative.

Shear Forces

Shear forces V_y, V_z or V_u, V_v are considered in the program as acting on the shear center M of the model.

If you have entered the shear forces in relation to the input axes y and z, they are automatically transformed in the direction of the principal axes u and v for the calculation. In the 'Internal Forces' table, the transformed shear forces are also shown after the calculation.

torsional moments

The primary torsional moments M_xp and secondary torsional moments M_xs are related to the shear center M.

Sum of torsional moments

The sum of the torsional moments M_t results from the addition of the primary and secondary torsional moments.

bending moments

Bending moments M_y, M_z or M_u, M_v are considered by the program acting on the centroid S of the model.

If you have entered the bending moments in relation to the input axes y and z, they are automatically transformed in the direction of the principal axes u and v.

bimoment

The program considers the bimoments M_ω as acting on the shear center M of the model.