I compare the flexural buckling design according to the equivalent member method and the internal forces according to the linear static analysis with the stress calculation according to the second-order analysis including imperfections, and obtain very large differences. What could be the reason?

Answer

While the influence of imperfection rises significantly with the increasing axial force and the design increases exponentially, this only increases linearly equal to the increase of the axial force in the case of the equivalent member design. Therefore, there are usually stronger deviations of the structural systems with a very high and a very low utilization in the design ratios of the linear static analysis by using the equivalent member method in comparison with the second-order analysis by using the stress analysis.

Keywords

Differences Equivalent member design Stress analysis Linear static analysis Second-order analysis

Downloads

Contact us

Contact to Dlubal

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.

+49 9673 9203 0

info@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
RSTAB Steel and Aluminium Structures
STEEL EC3 8.xx

Add-on Module

Design of steel members according to Eurocode 3

Price of First License
1,480.00 USD
RFEM Steel and Aluminium Structures
RF-STEEL EC3 5.xx

Add-on Module

Design of steel members according to Eurocode 3

Price of First License
1,480.00 USD
RSTAB Steel and Aluminium Structures
STEEL 8.xx

Add-on Module

Stress analysis of steel members

Price of First License
760.00 USD
RFEM Steel and Aluminium Structures
RF-STEEL 5.xx

Add-on Module

Stress analysis of steel surfaces and members

Price of First License
1,030.00 USD