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February 7, 2019

In this video, you’ll learn how to investigate your RISA-3D model for P-Delta divergence errors. This type of error is common in general structural analysis software and has two major causes: a model that is unstable or a model that is too flexible. For this investigation, two separate steel frame models will be used to […]

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August 23, 2018

“Why am I receiving a P-Delta instability error when I run my DL + LL load combination? I don’t see this error when I run my lateral load only combination.” This is a very popular question that we receive in technical support and it is quite understandable. Why would the model solve with a lateral […]

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November 7, 2012

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In this video, you’ll learn how to investigate your model for P-Delta Divergence errors.

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February 23, 2012

How Do I Resolve a P-Delta Instability?

Investigating P-Delta instabilities in RISA-3D (or RISA-2D) can be difficult. The first step is usually to solve the model without the P-Delta effect included to see if there are any obvious deflection problems that could cause issues with a P-Delta analysis.

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January 4, 2011

How to Use P-Delta Analysis in RISA-3D

P-Delta analysis induces shears into the model due to the second order effects of axial forces and lateral deflections, and can be automatically checked in RISA-3D with a few simple steps.

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