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  1. 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
  2. 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)...
  3. 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...
  4. 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...

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