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March 25, 2015

### How are Unbraced Lengths coordinated between RISAFloor and RISA-3D?

In a RISAFloor model the columns and beams can be assigned unbraced lengths, or the program may calculate them automatically. This unbraced length information can then be used in RISA-3D. A great example is the frame below: The beams along Grid Lines 1 and 2 have fixed ends. Therefore their bottom flanges are in compression, […]

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December 3, 2014

### What do the Unbraced Length commands Segment and Lbyy mean?

Aside from leaving an unbraced length blank or inputting a fixed distance, you can harness the program’s ability to use a limited intelligence for determining unbraced lengths. In order to do this you can simply type in the name of the Unbraced Length Commands into the unbraced length field. Below are the two most common commands: Segment […]

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November 19, 2014

### What do the Unbraced Lengths represent?

There are three types of unbraced lengths in RISA: Lb Values (Lb, Lu, Le), Lcomp Values (Lcomp, Le-bend) and L-torque.

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November 12, 2014

### How do Unbraced Lengths affect Analysis?

The axial compression and flexure strength of beams and columns is dependent on the spacing of elements which provide bracing along the length of those members. You may specify unbraced lengths as a fixed distance or by using RISA’s Unbraced Length Commands. These unbraced lengths are used for member capacity calculations. However, specifying bracing via […]

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June 1, 2011

### How to Assign a Wood Roof Member’s Unbraced Length in RISAFloor

In RISAFloor, the beams are susceptible to two forms of buckling; Euler buckling and lateral-torsional buckling. The unbraced length is determined in RISAFloor using the deck properties and framing.