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December 9, 2015

### Envelope Detail Report Results

RISA-3D version 14.0.0 introduced envelope detail reports for all material members.  This means that you can see the enveloped solution (force diagrams and governing code check values) in the detail report for each member when you solve either an Envelope or Batch + Envelope solution type. This is available for the following material types: Hot […]

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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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August 27, 2014

### What is a Rigid Link in RISA-3D?

A rigid link is a member element in RISA-3D that can be used for many advanced modeling procedures. It is so useful that it is included as one of the default member Section Sets.

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October 9, 2013

### What is the Tau b Factor and how does it affect my analysis?

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 references to a factor called Tau_b.

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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 […]