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April 5, 2018

RISAFoundation now has the capability to consider seismic loading for retaining walls. The Mononobe-Okabe formulation has been implemented, though direct input of the maximum pressure at the top of the wall can also be defined to create the inverted triangular loading. For details on the Coulomb calculations and the variation due to the Seed & […]

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Posted in Technical Solutions, What's New | Comments Off on Retaining Wall Design Now Considers Seismic Loading

March 22, 2018

In RISA-3D we now have the ability to design concrete shear walls for seismic forces. There are 3 main aspects to concrete shear wall design. We will explain them here. Pier Design: ACI 318-14 Section 18.10.8 defines the wall pier design parameters. Coupling Beam Design: ACI 318-14 Section 18.10.7 defines the coupling beam design parameters. […]

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Posted in Technical Solutions, What's New | Comments Off on Concrete Wall Design for Seismic Forces Now Available

September 11, 2017

In version 15, the Drift Reporting is new and improved.  The drift definitions are now automatically created for any existing diaphragms.  For models without diaphragms, defining drift has been greatly simplified. The reported drift results have been updated as well, and are now much more relevant for today’s codes.  Drift results will report results in […]

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Posted in Technical Solutions | Comments Off on Improved Drift Reporting

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 to […]

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