The target audience for this presentation is any structural engineer or professional in a related field who
is involved with dynamic analysis design on various structures including natural vibration analysis,
machine induced vibrations, blast loads, etc. These considerations typically require an advanced design
software which should include time history analysis.
RFEM is a nonlinear finite element analysis software for static and dynamic analysis and design. The
program is complete with design standards for steel, concrete, timber, aluminum, CLT, glass, and formfinding
per the USA standards and other international standards. Additionally, dynamic analysis for
natural vibrations, response spectra, and time history analysis are included.
Nonlinear time history analysis was recently added to the dynamic capabilities in RFEM. Previously, only
linear time history analysis could be considered. This placed limitations and simplifications on
nonlinearties such as tension only members or nonlinear support conditions (ie. failure with uplift).
In this presentation, we will cover the different approaches of a linear vs. nonlinear time history analysis
including the different RFEM solvers offered in the program. We will proceed to an example in RFEM of
a steel structure with machine induced vibrations which are accounted for with a time history analysis
and the effects on the structure.
Comparisons will be made with a linear vs. nonlinear time history analysis and how nonlinearities
modeled in the structure are taken into consideration. Lastly, the time history results will be reviewed
in detail such as member forces, node deformation, and acceleration limits.
After the presentation, attendees will have better insight on linear and nonlinear time history
application in structural analysis and design software.