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January 11, 2017

ibc2015

The new 2015 IBC- compliant codes have been implemented into RISA-3D v15.0, RISAFloor v11.0, and RISAFoundation v9.0! These include: AISC 360-10 (14th Edition)- Steel Design Code ASCE 7-10- Minimum Design Loads Code AISC 341/358-10- Hot Rolled Steel Seismic Provisions AISI S100-12 – Cold Formed Steel Design Code ACI 530-13- Masonry Design Code ACI 318-14- Concrete Design […]

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December 12, 2016

coordinatescursor

In RISA-3D, RISAFloor, and RISAfoundation the cursor now provides additional information regarding the cursor coordinates. As you move your cursor around on your screen, a box adjacent to your cursor will appear and populate with the coordinates of the cursor. The mouse coordinates that are displayed are the coordinates of the grid point or joint […]

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November 16, 2016

analysis-offset-01

In the RISA-3D when you model a WT brace it exists at the member centroid, which means that no bending ends up in the brace due to the fact that the brace is actually eccentric to the braced frame. In Version 15.0 we added a feature called “Analysis Offset” which moves the centroid of the member […]

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November 2, 2016

graph

Seismic Forces are generated automatically using seismic parameters R, SD1, and SDS in the Seismic Load Generator when using the Director to go from RISAFloor to RISA-3D or when inserting Seismic Loads on a rigid diaphragm in RISA-3D. And Seismic Load Combinations can be generated using the seismic parameters ρ, Ωo, and SDS and applied […]

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Posted in Technical Solutions | Comments Off on Basic Code Terms for Seismic Behavior and Why We Use Them

October 19, 2016

flexible-diaphragm-instability1

In a model that contains both RISAFloor and RISA-3D data it is possible to define your diaphragms as either flexible or rigid for lateral design.  You can do this from the Diaphragms spreadsheet in either program: Rigid diaphragms will create a rigid link mesh in RISA-3D that makes the diaphragm act as a rigid body.  […]

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Posted in Technical Solutions | Comments Off on Why Am I Getting Instabilities in RISA-3D With Flexible Diaphragms?