February 28, 2011

How To Generate Seismic Loads Automatically in RISA-3D

Applying seismic loads to structures with rigid diaphragms can be done automatically in RISA-3D. In the image below we have a structure that has rigid diaphragms and the seismic load has already been applied at each diaphragm level.


To do this, go to Advanced > Seismic Loads and input the code and the necessary parameters to calculate the seismic force in the structure. Note that we also need the Seismic Weight defined in a load combination that we choose here.


Once we hit the Calc Loads button the program calculates the forces at each diaphragm level in each orthogonal direction and gives the parameters used to calculate these forces. For the ASCE 7-05 code the program uses the Equivalent Lateral Force Procedure.


If we then hit Generate, these loads are added to your Basic Load Cases automatically. RISA-3D also automatically provides accidental eccentricity Basic Load Cases prescribed for rigid diaphragms.


Tags: RISA-3D Seismic Loads

You may also be interested in

Nov 8, 2018 | Tips & Tricks
Mat Slab Overturning and Sliding Safety Factors

RISAFoundation v11.0 includes two new tabs in the Safety Factors resul...
Read More

Aug 21, 2019 | Tips & Tricks
RISA-3D v18 Sneak Peek Videos

The new release of RISA-3D is right around the corner! Check out our t...
Read More

Jul 12, 2019 | Tips & Tricks
Implementing Realistic Behavior for T/C Members in RISA-3D

Tension or Compression (T/C) Only members are commonly used in steel b...
Read More

Jun 20, 2019 | Tips & Tricks
Understanding Wall Panel Forces with Rigid Diaphragms

Rigid diaphragms represent a plane of very high rigidity and distribut...
Read More