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  1. jackzhong

    Class A and AA Concrete Properties

    Thanks, PEinc. I am doing a FEM analysis on bridge approach slab and would like to have resonable properties for the concrete slabs normally classed as "A" and "AA". Jack
  2. jackzhong

    Class A and AA Concrete Properties

    Hi, Does anyone know the properties of Class A and AA Concrete properties (Stength and Young's Modulus)? Thanks in advance. Jack
  3. jackzhong

    How to print an array with variable dimensions in VB

    Does anyone know how to print an array with variable dimensions in VB? The following code won't do what I want, it outputs only one column, not rj (10 here) columns. Open "debug.txt" For Output As #1 rm=10 rj=10 For i = 1 To rm For j = 1 To rj Print #1, my_array(i,j)...
  4. jackzhong

    How to copy a formula without changing references

    MortenA, To add $, you can use "F4" key, it will save you time. Before you add "$", place the sursor where you want to add. Regards, jackzhong
  5. jackzhong

    Steel axial compression equation

    In ASD steel manual, ninth edition, page 5-54, equation H1-1: fa/Fa+Cmx fbx/((1-fa/Fex')Fbx) +Cmy fby/((1-fa/Fey')Fby)<=1.0 Should &quot;Cm/(1-fa/Fex')&quot; or &quot;Cm/(1-fa/Fey')&quot; be always greater than 1.0? Jack McCormac's &quot;structural steel design ASD method&quot; book metioned...
  6. jackzhong

    Factor k in the correlation of OCR with CPT data

    Normally soil overconsolidation ratio (OCR) is related to CPT data as: OCR = k (qc - rD)/(r'D) Where qc = cone resistance r = soil unit weight r' = effective soil unit weight D = penetration k = constant Several references mentioned that the range of k is 0.2...
  7. jackzhong

    Trendline problems

    When you use very high order polynomial trendline, you should be careful about all the constants You should set the decimal places to a very large number by formatting the data label of the equation. It looks that 6 significant digits such as &quot;-0.0023&quot; is not enough, you need more...
  8. jackzhong

    Excel macro stopping

    There are several ways to make your spreadsheet run faster. For example, copying and pasting by &quot;Range&quot; instead of writing to cells by looping blocks, turning off screen updating by using Application.Screenupdating=False, etc.

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