Section force calculations in models with PDELTA ANALYSIS and tension/compression is incorrect


 Applies To 
 Product:STAAD.Pro
First Affected Version:20.07.00.01
 Found in Version:20.07.11.50
Released in Version:20.07.11.70
Environment:All
 Area: Analysis
Subarea:Pdelta analysis
 Issue #:371896

Problem Description

In a Pdelta analysis with tension/compression, the pdelta effect is not considered in section force calculations unless each load case is followed by the PDELTA ANALYSIS and CHANGE.

Steps to Reproduce

  1. Have two exact same models with PDELTA ANALYSIS and tension/compression.
  2. In one use PDELTA ANALYSIS and CHANGE after every load case.
  3. In the other use the PDELTA ANALYSIS command once at the end.
  4. Analzye both models and observe that the results do not match.

Workaround

Provide PDELTA ANALYSIS and CHANGE command after each load case for which analysis/design is to be carried out

Solution

This has been addressed in 20.07.11.70

See Also