AutoPIPE + STAAD results not consistent

Hi,

We are investigating the integration between AutoPIPE and STAAD (Bentley AutoPIPE CONNECT Standard Edition - Version 12.08.00.063 and STAAD.Pro CONNECT Edition - Version 22.01.00.39). We want to understand if we can analysis the structure and pipework together.

We are aware of the SQLite Pipelink workflow, but at the moment we are transferring loads by hand for verification. The following is what we tested:

  • Model a single pipe in AutoPIPE with three load case: gravity, temperature and GRT
  • Model a simple goal post frame in STAAD using Analytical Modeling
  • Export the STAAD model as .pipelink.db file
  • Insert the .pipelink.db file to AutoPIPE
  • Model the connection between the structure and pipe support by connect the node on the structure to the node on the pipe, call this point A
  • Run the analysis in AutoPIPE
  • Extract the support load at point A and apply it as point load in STAAD
  • Comparing the anchor reaction and displacement results of AutoPIPE and STAAD

We think the results between the two software should match, however they only match for the gravity load case, not the thermal load case. We would like to understand what the reason for the discrepancy could be. 

We have also tried with a more complex model with more load cases, including wind load and a response spectrum analysis. The discrepancy in results from that model is even bigger, so we think we have missed something. Your help will be much appreciated.

Best Regards,

Aslinn

Comparision results as below:

Load extracted from AutoPIPE
Point Combination GlobalFX GlobalFY GlobalFZ
    N         N         N        
A03 Gravity{1} 0 -2457 0
A03 Thermal 1{1} 84 74 0
A03 GRT1{1} 84 -2383 0
Displacement results from AutoPIPE at point A03
Point Combination DX DY DZ
    mm        mm        mm       
A03 Gravity{1} 0 -4.83 0
A03 Thermal 1{1} 8.75 0.14 -69.13
A03 GRT1{1} 8.76 -4.69 -69.14
Displacement results from STAAD at point A03
Point Combination DX DY DZ
    mm        mm        mm       
A03 Gravity{1} 0.00 -4.83 0.00
A03 Thermal 1{1} 8.79 -0.02 0.00
A03 GRT1{1} 8.79 -4.69 0.00
Anchor force results from AutoPIPE
  Combination GlobalFX GlobalFY GlobalFZ GlobalMX GlobalMY GlobalMZ
    N         N         N         N.m       N.m       N.m      
Support 1 Gravity{1} -85 -1632 0 0 0 141
Support 1 Thermal 1{1} 44 135 0 0 0 -115
Support 1 GRT1{1} -41 -1497 0 0 0 26
Support 2 Gravity{1} 85 -1632 0 0 0 -141
Support 3 Thermal 1{1} 39 -61 0 0 0 -107
Support 4 GRT1{1} 124 -1693 0 0 0 -248
Anchor force results from STAAD
  Combination GlobalFX GlobalFY GlobalFZ GlobalMX GlobalMY GlobalMZ
    N         N         N         N.m       N.m       N.m      
Support 1 Gravity{1} 85 1632 0 0 0 -141
Support 1 Thermal 1{1} -41 268 0 0 0 111
Support 1 GRT1{1} 40 1496 0 0 0 -26
Support 2 Gravity{1} -85 1632 0 0 0 141
Support 3 Thermal 1{1} -43 465 0 0 0 112
Support 4 GRT1{1} -124 1693 0 0 0 249
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