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June 28, 2018

A Deeper Understanding of Deflection and Member Deflection Ratios

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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June 21, 2018

Beam Deflection Ratio Options

RISA-3D v16.0.4 introduces an enhancement that will allow for more control over the beam deflection ratio through Deflection Ratio Options. As part of the member properties, you can now designate the ends of single and multi-span beams as a cantilever or supported. This will determine whether the beam deflection ratio is calculated as L’/y’ (supported) […]

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September 16, 2015

How RISA-3D Calculates Member Deflection Ratios

After solving a model, you will see in the Member Deflections spreadsheet the following deflection ratios: These ratios are calculated using the full length of the member (L) minus any member end offsets. This length does not consider individual span length in continuous span members. Also the length does not consider 2*L for the length […]

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July 1, 2014

Viewing the Deflected Shape in RISAFloor

The deflected shape is really helpful to understanding your model’s behavior. You can view the deflected shape of your model in RISAFloor.  Just change the view to the Isometric view   and click on the Deflected Shape Icon  (Note: If you don’t have Deflected Shape Icon, you can add it to your customized toolbar). You can also […]

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September 6, 2013

Why Are The Steel Beam Deflections So Large?

When solving a RISA-3D model with hot rolled steel members under the AISC 360-05 (13th Edition) or AISC 360-10 (14th Edition) codes you may find that your member deflections are roughly 20% larger than you would expect. To understand why see the AISC 360-10 Specification, Section C2.3.1: “A factor of 0.80 shall be applied to […]