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October 4, 2018

RISA-3D v17.0 now has the ability to model partial fixity member end releases. Partial fixity end releases can be utilized in RISA to model the behavior of a partially restrained or semi-rigid connection that cannot be idealized as fully fixed or pinned. Partially restrained connections are common in seismic moment frame systems and their semi-rigid […]

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Posted in Technical Solutions, What's New | Comments Off on Partial Fixity End Releases in RISA-3D

September 27, 2018

In a previous article we discussed how the Analysis Offsets feature in RISA-3D works and how it can be used to model members at top of steel.  In this article, we will discuss some specific situations and how the results change with the analysis offset set as top of member (local -y axis). In most […]

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Posted in Education | Comments Off on Challenges when using Analysis Offsets

September 27, 2018

Have you ever wondered what the Analysis Offset feature does?  Let’s take a look at how this feature can be used to model members at top of steel. The analysis offset feature allows a member to be offset from its centerline for analysis. When it is enabled the member is actually shifted to the offset location for […]

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August 2, 2018

For concrete column members, the load combination producing the maximum shear code check is reported in the Detail Report and corresponding Results spreadsheet. Since concrete is evaluated based on a batch solution, this can be useful when shear governs the design. RISAFloor Concrete tab of the Column Results spreadsheet: Column Detail Report: RISA-3D: Concrete Columns […]

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Posted in Education | Comments Off on Governing LC for Shear in Concrete Columns

June 28, 2018

There are many different types deflection values calculated by RISA-3D.  Let’s take a deeper dive into each. Absolute deflection is the maximum absolute value for deflection in the member local lateral y- and z-axis. In engineering terms, this value is also commonly referred to as global deflection since it encompasses the entire movement of a […]

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Posted in Education | Comments Off on A Deeper Understanding of Deflection and Member Deflection Ratios