RISABase FAQ
Common support and usage questions.
RISABase
Why don’t my RISA Section shapes appear in the RISA 3D shape selection database?
There are a few common mistakes people make when attempting to access RISA Section files in RISA 3D:
Common RISA Section Mistakes:
- Don’t confuse the name of the RISA Section “File” with the name of the “Section”. The name of the “section” is what will appear in the RISA 3D database. Note: each file can contain many different sections. Hence the need to name each individual section.
- Make sure the Sections names are unique. Since RISA Section always uses default names of Section 1, Section 2…et cetera, you will probably have to rename your sections before saving your file. You can do this by clicking Section – Rename Sections from the Main Menu Toolbar (within RISA Section, not RISA 3D).
Common RISA 3D Mistakes:
- Check the File Location settings for RISA Section Files under Tools-Preferences. When RISA 3D launches, it will search for RISA Section files ONLY in the directory listed in Tools-Preferences.
- RISA 3D only reads in Section files when it is first launched. Therefore, you must close and restart RISA 3D after creating the file in RISA Section.
Why am I only getting single anchor bolt pullout checks and not group checks?
You are most likely using a custom anchor bolt layout. Custom layouts allow you flexibility in modeling your anchor bolts, however ACI does not give any instruction on how to handle group pullout of anchors that are not arranged in a grid pattern, therefore we have no way to check group behavior.
Why am I getting incorrect Geometry errors when I solve?
Carefully review your specified minimum spacings in the Anchor Bolts dialog (including both Min AB to Col spacing and Min AB to edge spacing). Also, if you are using custom anchor bolts, try sketching out your layout to ensure that none of the bolts fall off of the plate or on top of the column.
The results in RISABase do not match my hand calculations. Why?
RISABase analyzes the baseplate using finite element analysis. The program assumes that the plate is free to bend out-of-plane and this bending causes a redistribution of forces on the pedestal. Most baseplate hand calculations assume that the plate is rigid. If you would like to use this assumption, you can choose to Force Base Plate to be Rigid in the Base Plate dialog.
How does RISABase calculate effective embedment length (hef) for anchor bolt pullout calculations?
The effective embedment length is taken as the difference between Total AB Length and Projected AB Length, both of which are defined in the Anchor Bolts dialog.
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