STAAD.Pro Help

P. Beam End Forces table

This table displays the numerical values of the forces that are applied on to a beam from the nodes that define its start and end. There are thus two rows of data per member per load case. The range of beams and load cases that are included in the table are selected from the Results Setup dialog,(see Results Setup dialog).

The units for the data are defined in the Display Options dialog > Force Units sheet as the Force unit for the FX, FY and FZ results and Moment for the MX, MY and MZ results. Note that it is possible to select an alternative unit for forces or moments by right-clicking over a value and selecting the unit from the options in the pop-up menu ‘Change Unit for this column’

This table, along with the Beam Force Detail table is opened when the Beam Results page is selected. The table has three tabs which allows the data to be displayed thus:

Opens when the Beam Results page is selected.

All tab

The results for all load cases and beams selected in the Results Setup dialog are displayed. Each result being the force on the node as applied to the beam.

Summary tab

This tab presents maximum and minimum End Force results for each degree of freedom. All specified members and all load cases are considered.

In order to account for the fact that the direction of the forces is inverted at the far end of the beam to induce an equivalent force on the beam, the signs of the force at the far end of the beam are first inverted and the maximum/minimum values are then determined.

For example consider a beams which have been loaded in two load cases such that the first is in compression by 10kN and in the second is in tension by 5kN. This would be reported in the All results tab thus:

Beam L/C Node Fx (kN) Fy (kN) Fz (kN) Mx (kNm) My (kNm) Mz (kNm)
1 1 Compression 1 10.000 0.000 0.000 0.000 0.000 0.000
2 -10.000 0.000 0.000 0.000 0.000 0.000
2 Tension 1 -5.000 0.000 0.000 0.000 0.000 0.000
2 5.000 0.000 0.000 0.000 0.000 0.000

As the values of the far end results are inverted, the value of Max FX reports the maximum compression and Min FX reports the maximum tension thus:

  Beam L/C Node Fx kN Fy kN Fz kN Mx kip-in My kip-in Mz kip-in
Max Fx 1 1 Compression 1 10.000 0.000 0.000 0.000 0.000 0.000
Min Fx 1 2 Tension 1 -5.000 0.000 0.000 0.000 0.000 0.000
Note: The inversion of the far end results applies to all degrees of freedom to provide similar insights on the forces experienced on the beam.

Envelope tab

This tab reports the details for each beam which load case provides the most positive and most negative effect for each degree of freedom, (i.e. 8 results per beam).

This is displayed on 4 rows,

  1. On the start node:
    1. The most positive effect in each degree of freedom.
    2. The load case that produce the most positive effect.
    3. The most negative effect in each degree of freedom.
    4. The load case that produce the most negative effect.
  2. On the far node:
    1. The most positive effect in each degree of freedom.
    2. The load case that produce the most positive effect.
    3. The most negative effect in each degree of freedom.
    4. The load case that produce the most negative effect.

If there is no load case that produces a positive or negative effect, that is indicated with "-" as the load case.