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November 2, 2016

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

August 24, 2016

Due to the nature of seismic brace design per the AISC Seismic Design Manual, the design loads for a seismic vertical braced connection are not always based on the input loads or the imported load combinations from RISA-3D integrated model. Seismic vertical brace connections must consider several possible envelops of loading. This is necessary in […]

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Posted in Technical Solutions | Comments Off on How Are Seismic Brace Connection Design Forces Determined?

June 28, 2016

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 […]

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Posted in Technical Solutions | Comments Off on Seismic Brace Connection Integration with RISA-3D

June 21, 2016

Seismic brace connections are a bit different from other connection types in RISAConnection.  This is because the brace and connection elements must be designed for both tension and compression loading. Brace Design Tension Load The AISC Seismic Design Manual requires that all seismic brace connections are designed for the minimum of the required tensile strength […]

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Posted in Technical Solutions | Comments Off on Calculation of Forces in Seismic Brace Connections

June 17, 2016

It is possible for seismic (OCBF or SCBF) vertical braced connections to have some limit state code checks lower than those for the same non-seismic connection. This is due to the assumptions that RISAConnection makes when calculating the axial load in the beam. Non-seismic vertical brace connections only have a single beam axial load input […]

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Posted in Technical Solutions | Comments Off on Why Do Seismic Brace Story Forces Change My Existing Code Checks?