FAQ 004200 EN-US

11/08/2019

Thomas Günthel Results RFEM RSTAB

Why are there no resultant support forces for result combinations?

Answer

For a resultant, a concrete combination of loads is required, which result combinations cannot provide.

The problem is apparent in the following example. A single-span beam is loaded with three different load cases. For the support at node 1, the result envelope of the 6 possible load combinations gives a maximum P-Z of 11.25 kN based on the result of CO2 (see Figure 01). The support at node 2 has a maximum P-Z of 12 kN based on the result of CO1. The resultant of 23.25 kN, however, does not exist in any of the involved load combinations and is therefore too large (maximum LK 1 and LK 2 with 22.5 kN).

The situation is similar to the pure result combination of the load cases which have the same maximum values P-Z of the nodal supports 1 and 2. However, it is not apparent here that a resultant would give incorrect results.

For this reason, a resultant is not used for result combinations, since the results can be incorrect.

Keywords

Resultant Result combination

Downloads

Contact us

Contact Dlubal Software

Did you find your question?
If not, contact us via our free e-mail, chat, or forum support, or send us your question via the online form.

(267) 702-2815

info-us@dlubal.com

RFEM Main Program
RFEM 5.xx

Main Program

Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

Price of First License
3,540.00 USD
RSTAB Main Program
RSTAB 8.xx

Main Program

The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions

Price of First License
2,550.00 USD