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Amplified first-order option in models with tension-only braces

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Current Revision posted to RAM | STAAD Wiki by Seth Guthrie on 8/29/2017 5:45:43 PM

Subtitle

 Applies To 
 Product:Ram Elements
First Affected Version:13.05.00.224*
 Found in Version:14.00.00.240
Fixed and Released in Version:
Environment:All
 Area: Design
Severity:High
 Issue #:745717

Problem Description

In models with tension-only members (or compression-only members), the Amplified first-order elastic analysis method should not be considered in the Design settings for Steel AISC code design

The symptoms can include tension-only braces being designed for significant axial compression (and usually failing), braces being designed for no force at all, or other members being designed for forces that are very different from the analysis results. 

Solution

Do not include this option for Amplified first-order elastic analysis in the Design Settings when the model includes tension-only members. 

When second order P-Delta analysis is considered, this option is not available, so the problem cannot affect models using P-Delta.

Tags: Active, RAM Elements, P-delta, known issue, defect

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