RISAConnection version 6.0 has introduced the ability to design vertical brace connections per the seismic design provisions of the AISC 341-10 Seismic Design Manual.
Now you can export Vertical Diagonal Brace Connections and Vertical Chevron Brace Connections from RISA-3D into RISAConnection as either Ordinary Concentric Braced Frames (OCBF) or Special Concentric Braced Frames (SCBF).
See post for information on How to Model a Seismic Vertical Brace Connection in the stand alone version of RISAConnection.
RISA-3D Input and Design:
- First, you must create and apply a Seismic vertical brace Connection Rule to your member in RISA-3D. The application rules are the same as for non-seismic vertical braces.
- You must also create and apply an appropriate Seismic Design Rule. For OCBF, select a “Minimal” Frame Ductility. For SCBF, select “High” Frame Ductility.
- Solve the RISA-3D model. Note that you must solve for RISA-3D Seismic Detailing results. If your solution does not include Seismic Detailing results, you will not be able to export the correct brace axial forces into RISAConnection.
- Solve the Connections within RISA-3D to see a summary of the connection design.
- For details on the connection design, use the Director tool to export to RISAConnection.
- Once RISAConnection is launched, your model will automatically open so you can edit your connection details.
- RISAConnection will automatically import the Connection Type, Seismic System, Brace Lengths and Effective Length Factors.
- It will also import the maximum possible brace forces in tension and compression. These results come from the RISA-3D Seismic Detailing results and are independent of the selected load combination.
- The results report will include a new Seismic tab which includes all of the relevant seismic limit state checks and load calculations.
- Each of the existing tabs will report the governing calculated forces in tension and compression so all possible limit states may be checked accordingly.