HOW DOES RCDC CALCULATES THE BAR SPACING IN THE FOOTING?

HOW DOES RCDC CALCULATES THE BAR SPACING IN THE FOOTING AS I GET A MIN OF 497 MM OF FOOTING SIZE OF 1500 X 1400? NOW IF I WANT TO CALCULATE THE SPACING WITH 10 DIA OF BAR IT WOULD BE 10 T @ 239 BUT RCDC SHOWING 10 T @ 250 WHICH IS 471 MM^2 STEEL? 
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  • Hi,

    spacing provided in the footing is explained by below example.

    As per design, required reinforcement is 497 sqmm along B direction. Provided reinforcement is T10@250mm which amounts to 471sqmm only for 1500m width of footing, whereas the calculation report shows Ast provided as 549sqmm.

    Width                                                              =             1500mm

    Ast required                                                   =             497sqmm

    Reinforcement provided                             =             T10@250mm

    In RCDC the number of bars required are calculated and spacing is calculated. While presenting the spacing rounded to 5 mm.

    In this example, number of bars as per spacing would be calculated as below –

    (1500/ 250= 6 which is 6 spaces). Hence number of bars provided on site would be 7(6+1).

    Thus, actual Ast-provided would be (7x78.5398 = 549.78) 549.78 sqmm which is more than required.

    for more FAQ's, please check link: 5. RCDC Support Solutions - RAM | STAAD | ADINA Wiki - RAM | STAAD | ADINA - Bentley Communities

  • but how this  250 spacing was coming ? as we know spacing is calculated from following formula

    spacing = (area of one bar * length of footing) /Ast  then in my case if i am using the 10 mm dia bar the 78.5*1500/497  + 236 spacing while rcdc reported 250mm 

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