1 min read
WEBINAR: Basics of Dynamics Analysis in RISA-3D
Modeling and analyzing structures for dynamic conditions is essential to understanding how a structure will react to loading such as wind and...
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Dynamics
3 min read
Improving Mass Participation in RISA-3D
Admin: Jul 21, 2020 12:00:00 AM
In structural engineering, a modal analysis uses the overall mass and stiffness of a structure to find the various periods at which the structure...
1 min read
Importing Recorded Seismic Ground Motions
Admin: Mar 10, 2016 12:00:00 AM
The Pacific Earthquake Engineering Research center (PEER) has a large library of measured earthquake records. Below is an example of how to quickly...
1 min read
What are the Ramp Up/Coast Down Functions in Time History?
Admin: Feb 24, 2016 12:00:00 AM
Ramp Up Function RISA allows you to define “Ramp Up Functions” to control how the force and frequency vary during this initial startup time....
1 min read
Importing a Time History Function
Admin: Jan 14, 2016 12:00:00 AM
New in RISA-3D v14 is the introduction of a Time History analysis feature. Time history functions may be generated directly in the program based on...
1 min read
Making a Time History Animation Video
Time history analysis solves for normal analysis results (joint displacements, member forces, code checks, etc.) based on loading that varies with...
3 min read
Ritz Vector Solver (Dynamics) now Available
Admin: May 4, 2015 12:00:00 AM
RISA-3D v13 includes a new Ritz Vector Solver for the Dynamic analysis. When running a Response Spectrum analysis for seismic design, some structures...
1 min read
Why Don’t My Response Spectra Reactions Satisfy Statics?
Admin: Apr 3, 2012 12:00:00 AM
The applied loads in a response spectrum analysis (RSA) are the applied masses times the accelerations in the response spectra. Each mode of...