June 28, 2016

Seismic Brace Connection Integration with RISA-3D

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:

  1. 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.
    R3D Export Seismic Braces_1
  2. You must also create and apply an appropriate Seismic Design Rule. For OCBF, select a “Minimal” Frame Ductility.  For SCBF, select “High” Frame Ductility.
    R3D Export Seismic Braces_2
  3. 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.
    R3D Export Seismic Braces_3
  4. Solve the Connections within RISA-3D to see a summary of the connection design.
    R3D Export Seismic Braces_4
  5. For details on the connection design, use the Director tool to export to RISAConnection.
    R3D Export Seismic Braces_5

RISAConnection Model:

  1. Once RISAConnection is launched, your model will automatically open so you can edit your connection details.
  2. RISAConnection will automatically import the Connection Type, Seismic System, Brace Lengths and Effective Length Factors.
    R3D Export Seismic Braces_6
  3. 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.
    R3D Export Seismic Braces_7
  4. The results report will include a new Seismic tab which includes all of the relevant seismic limit state checks and load calculations.
    R3D Export Seismic Braces_8
  5. Each of the existing tabs will report the governing calculated forces in tension and compression so all possible limit states may be checked accordingly.
    R3D Export Seismic Braces_9




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This entry was posted by RISA News on Tuesday, June 28th, 2016 at 10:31 am and is filed under Technical Solutions. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.

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