Pile Cap Design and Detailed Pile Reactions

Attached a .STA file for a pile cap. I can see the summary results for pile reactions. Where can I find a detailed pile reaction for every piles. Also even though I have shear at the columns in both X and Z direction the pile reactions comes up as zero. Trying to make sense of this. Any pointers will be of great help. Thank you.

 00070_HWY-674_REV-A_foundation.sfa

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  • The Y coordinate of the support nodes in your model is 11.587 feet. The Y coordinate of the top of piles, and of the mat is 11.59 feet.

    Due to this small gap, the column reaction forces and moments are not being transferred to the mat. In all the load cases, the only load that the mat is being analyzed for is its selfweight. If you open the STAAD model of the mat that is generated by SFA, you will notice this.

    Change the value of the latter from 11.59 to 11.587, re-generate the mesh, and run the analysis again. You will then see the horizontal reactions that you are expecting at the pile supports.

    Also, in all the ultimate load cases, the selfweight is being applied with a factor of 1. If you wish to have the appropriate Dead load factor applied for that term, expand the "Loads & Factors" branch in the main navigator area (the left side of the screen), select the "Apply Self Weight And Dead Weight Factor" and provide the correct factor for all the combination cases.

    At the bottom of the screen, you will see a tab named "Pile Reaction" that will show a table of forces in the piles for the current load case. The current load case can be seen at the top of the screen in a drop-down list on the Home menu.



    Answer Verified By: Chandan Das 

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  • The Y coordinate of the support nodes in your model is 11.587 feet. The Y coordinate of the top of piles, and of the mat is 11.59 feet.

    Due to this small gap, the column reaction forces and moments are not being transferred to the mat. In all the load cases, the only load that the mat is being analyzed for is its selfweight. If you open the STAAD model of the mat that is generated by SFA, you will notice this.

    Change the value of the latter from 11.59 to 11.587, re-generate the mesh, and run the analysis again. You will then see the horizontal reactions that you are expecting at the pile supports.

    Also, in all the ultimate load cases, the selfweight is being applied with a factor of 1. If you wish to have the appropriate Dead load factor applied for that term, expand the "Loads & Factors" branch in the main navigator area (the left side of the screen), select the "Apply Self Weight And Dead Weight Factor" and provide the correct factor for all the combination cases.

    At the bottom of the screen, you will see a tab named "Pile Reaction" that will show a table of forces in the piles for the current load case. The current load case can be seen at the top of the screen in a drop-down list on the Home menu.



    Answer Verified By: Chandan Das 

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