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Recent content by engrAlan

  1. engrAlan

    Offshore Platform Extension

    Thanks Ussuri. We have conducted survey and we don't find any visual defects on the structural members on the top side. No modifications were done but most probably dents will be present on the underwater structures. On the design basis of these structural platforms, Deck Beams are designed for...
  2. engrAlan

    Offshore Platform Extension

    One of our projects is to install electrical equipment on an existing 15m x 10m offshore platform. The platform was built more than 20 years ago. Since there is no enough space to install the new equipment on the existing deck, we were forced to provide deck extension to accommodate our new...
  3. engrAlan

    Existing Slab Footing FAIL when design using STAAD Pro

    We cant find the previous set of calculations. However, I tried checking the slab capacity considering it as a doubly reinforced beam of 1m strip, it gave me a utilization ratio of 65%, is it acceptable to do it this way? as to subgrade modulus, we verified it to be the same as the previos one...
  4. engrAlan

    Existing Slab Footing FAIL when design using STAAD Pro

    Can anybody help me what i missed? I modeled an existing mat foundation of heat exchanger using plate element of STAAD Pro. Slab Thickness is 1100mm reinforced with 28mm dia spaced at 200 center-to-center. The provided steel is only 3.078sq.mm/mm with Moment cap = 1,131 kn-m/m (existing...
  5. engrAlan

    Matrix Error

    I found the error guys, it is on the multiplication of the following lines: CombFactor*submatrix(MatrixLoad,NoOfLoad*k,NoOfLoad(k+1)-1,0,NoOfForce-1) - The difference between NoOfLoad(k+1)-1] - [NoOfLoad*k] should be equal to the number of loads, (i.e NoOfLoad-1 to account 0, so i change the...
  6. engrAlan

    Minimum embedment of Pedestal Support

    Thank you TXStructural,i will try convincing our inspector to place fresh concrete it would easier for us. The inspector's idea of using 600mm embednent is to reach a more stable/stronger foundation base, and adding fresh concrete would suffice. thanks again.
  7. engrAlan

    Matrix Error

    Sorry Occupant but, i did the review of your attached file and the error is still there. Please take a look on the attached PDF file. I made a comparison between 3 pedestals which gave the MatrixLoad as shown in Page 5 of 10, and with 4 Pedestals which returned first error on page 9 of 10, and...
  8. engrAlan

    Matrix Error

    Excel was embeded as component, please see attached with arguments shown for each excel sheet.http://files.engineering.com/getfile.aspx?folder=f1b50634-15b3-469d-9c7f-086d5a692c03&file=Matrix_Problem.mcd
  9. engrAlan

    Matrix Error

    Yes, its quite big around 9 x 29 for 1 pedestal, 9 x 116 for 4 pedestals, that is 29 rows (for load comb) will be added for each pedestal added to the matrix. But i even tried reducing the number of load combination to only 3 (from 29 orig), the matrix size is 9 x 9 for 3 pedestals, 9 x 12 for...
  10. engrAlan

    Minimum embedment of Pedestal Support

    Thanks for sharing your spare time TXStructural. Cost for the additional 6" may not be an issue, but the issue is, how can we add this 6" to our precast pedestals? We already fabricated about 300 pcs, 300mm x 300mm x 600mm (450mm embedment and 150mm above the ground). These are intended not...
  11. engrAlan

    Minimum embedment of Pedestal Support

    Attached is how i determined the required depth. Our Area is not subjected to seismic and snow. And usually Geo-technical report will have 0.15-0.20 ksf lateral soil bearing capacity with no water table within 2m below natural grade...
  12. engrAlan

    Matrix Error

    Thanks for your response Occupant. But Final MatrixLoad has no result, this was my problem. one of the error is "This array has an incorrect number of rows and column"
  13. engrAlan

    Minimum embedment of Pedestal Support

    Can anybody share any ideas as to what is the minimum embedment of a pedestal support. We have fabricated a pre-cast concrete 300mm x 300mm x 600mm depth designed to support a 50kg instrument junction box. i did a calculation to determine the required embedment to the ground considering the...
  14. engrAlan

    Matrix Error

    No, it's not. because i already tried revising the output range in the excel file to include even 6 pedestals. i doubted the settings of the total number of loads. but i have no idea how this relates to the overall matrix formulation.
  15. engrAlan

    Matrix Error

    Can somebody help me resolve this error in Matrix output? I came across in the internet this useful template but I want to customize to increase its usage. The Matrix output on the attached MathCad File will have an error when the Number of Pedestal will be greater than 3. I can't figure out...
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