How to design an element which has critical load in between the construction stage?

Question:

In the design of composite steel structures under different construction stages (say 10 stages) does MIDAS consider the maximum of the developed forces during stage construction and those developed under other applied loads or just the loads developed after post-construction stages? for example at construction stage (4) the developed bending moment in member (i) is 100 kip-ft. After post-construction stage the completed structure will be subjected to other loads such as live load, wind, etc. Suppose the developed bending moment at the same member (i) is now 50 kip-ft. Will the Composite Design Module deign the member for 50 kip-ft or 100 kip-ft? please explain

In reality the member shall be designed for 100 kip-ft since it is the max controlling force. If this is not the case, how can we direct the software to design for the maximum developed forces during construction? please explain

Answer:
Hi,

The composite steel girder is designed using the combined forces of dead load at the last stage and live load, wind, etc. at the PostCS. In other words, it is assumed that the maximum forces due to dead load occurs at the last stage. Thus, the user needs to check if the maximum forces occur at the last stage. If a member is subjected to maximum force at the stage other than the last stage, the maximum forces can be applied for the design by setting the particular stage as the final stage from the 'Construction Stage Analysis Control' dialog.


Regards,
DK Lee
Creation date: 6/25/2018 2:52 AM      Updated: 5/4/2023 4:02 PM
Big.zip

Big.zip
Book1.xlsx

Book1.xlsx
Check Desighn for CS ONLY.mcb

Check Desighn for CS ONLY.mcb
Check Desighn for CS ONLY-midas.mcb

Check Desighn for CS ONLY-midas.mcb
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Deck Overhang.mcb

Deck Overhang.mcb
Fatigue - Staged Construction_Bracing.mcb

Fatigue - Staged Construction_Bracing.mcb
Fatigue - Staged Construction_Bracing[1].mcb

Fatigue - Staged Construction_Bracing[1].mcb
Final Position.mcb

Final Position.mcb
Junior Bridge.mcb

Junior Bridge.mcb
Junior Bridge.wzd

Junior Bridge.wzd
Loai_CS_Strength I.mcb

Loai_CS_Strength I.mcb
Mayo Bridge.mcb

Mayo Bridge.mcb
Mayo Bridge_LL_Road_Level.mcb

Mayo Bridge_LL_Road_Level.mcb
Mayo Bridge_LL_Road_Level.zip

Mayo Bridge_LL_Road_Level.zip
Service I_Staged Construction_Bracing.mcb

Service I_Staged Construction_Bracing.mcb
Service I_Staged Construction_Bracing.zip

Service I_Staged Construction_Bracing.zip
Staged Construction _ CS Load.mcb

Staged Construction _ CS Load.mcb
Staged Construction _ CS Load-midas 2.mcb

Staged Construction _ CS Load-midas 2.mcb
Staged Construction _ CS Load-midas.mcb

Staged Construction _ CS Load-midas.mcb
Strength I _ Construction Staged.mcb

Strength I _ Construction Staged.mcb
Strength I _ Construction Staged.MCB

Strength I _ Construction Staged.MCB
Strength I.mcb

Strength I.mcb
Strength I_ with Shear Connectors.mcb

Strength I_ with Shear Connectors.mcb
Strength I_CS _ No Spans.mcb

Strength I_CS _ No Spans.mcb
Strength I_sent to Midas.mcb

Strength I_sent to Midas.mcb
Strength I_Static Analysis.mcb

Strength I_Static Analysis.mcb
test.mcb

test.mcb
Untitled.mcb

Untitled.mcb
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Big.zip
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Book1.xlsx
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Check Desighn for CS ONLY.mcb
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Check Desighn for CS ONLY-midas.mcb
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Deck Overhang.mcb
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Fatigue - Staged Construction_Bracing.mcb
1 MB
Fatigue - Staged Construction_Bracing[1].mcb
1 MB
Final Position.mcb
469 KB
Junior Bridge.mcb
321 KB
Junior Bridge.wzd
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Loai_CS_Strength I.mcb
1 MB
Mayo Bridge.mcb
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Mayo Bridge_LL_Road_Level.mcb
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Mayo Bridge_LL_Road_Level.zip
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Service I_Staged Construction_Bracing.mcb
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Service I_Staged Construction_Bracing.zip
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Staged Construction _ CS Load.mcb
1 MB
Staged Construction _ CS Load-midas 2.mcb
1 MB
Staged Construction _ CS Load-midas.mcb
1 MB
Strength I _ Construction Staged.mcb
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Strength I _ Construction Staged.MCB
1 MB
Strength I.mcb
1 MB
Strength I_ with Shear Connectors.mcb
1 MB
Strength I_CS _ No Spans.mcb
1 MB
Strength I_sent to Midas.mcb
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Strength I_Static Analysis.mcb
1 MB
test.mcb
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Untitled.mcb
47 KB