Pipe in boxculvert stress analysis

First of all, I would like to let you know the objective of the subject is not pipe stress analysis result (as in other pipeline/piping software).

I would like to ask for structural analysis related to pipe (pipeline) located in boxculvert. I need an expert opinion regarding how certain the analysis I design for this case in staadpro.

I design a boxculvert made of concrete in rectangle shape (0.5 x 1) m. At the bottom of boxculvert I put a pipe (pipeline) with diameter 0.6 m and weld thickness 0.15 m.

I assign the distributed load on each side of the boxculvert as in reality the boxculvert will accomodate this load. The static analysis result show small displacement on the bottom of boxculvert.

I am wondering to know if this is a good representation to know the reliability of the boxculvert 

Attached is the file. Thank you. 6175.Structure2.std

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  • Few observations 

    You should define the structure type as SPACE instead of PLANE

    You have defined a pipe of thickness of 150 mm made of steel ( ?? ). You may want to check this.

    If the objective is to analyze the structure considering the pipe load on it, you may consider taking the pipe out from the model and just apply the load due to the pipe. If you model the pipe, it’s stiffness will also get accounted for in the stiffness analysis, besides the structural stiffness. Not sure if you wanted it to be that way.

    You may want to check the lateral loading on member 3. The applied trapezoidal loading has higher value at the top and lower value at the bottom.

    If you intend to perform a modal analysis, you should create a separate load case for that. In that load case apply the loads in all 3 directions with positive signs (to represent masses ) and use the MODAL CALCULATION REQUESTED command as the last command in that load case.



    Answer Verified By: Rifel Landong Pordiman 

  • Thank you for your reply Sye.

    The objective is to determine the strength of the boxculvert accomodating loadings in eachside of the box therefore considering the weight of the pipe and its stiffness.

    I redesign the model and it seems it has given the result I expected. Thank you for your correction.

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