Monday, February 29, 2016

CAN ANYONE TELL ME HOW STEEL QUANTITY IS CALCULATED IN THE CONSTRUCTION OF A BUILDING, LIKE FOOTINGS, BEAMS, COLUMNS, AND SLABS? HOW WOUL…

Method 01 :
Thumb rule method :
I know from my past experience that a normal residential building needs around 3 to 4 Kg of steel per sqft .of built up. This data has been worked out from the previous projects . I also recommend to each student to keep this statistics updated for their projects.
Suppose you ask me how much steel shall be required for a residential project where built up area is say 22,000 Sqft.
My immediate answer would be 22,000 x 4 = 88,000 Kg or 44 MT.
Such method is useful for arriving at the purchase quantity or for taking quotations from the steel traders. There could be variations depending upon the design philosophy.
Method 02 :
From Bill of quantities .
Quantities of various RCC elements are known from the bill of quantities.
Now suppose we know that footings need 50 Kg/CuM of reinf. steel so an if the quantity of footings is 100 CuM , we come to know that reinf in footings shall be 50*100 = 5000 Kg or 5 MT.
Method 03 :
This is the most accurate method .
We take the RCC drawing and for each element , calculate the cutting length and nos for each of the bars.
Schedule of bar weight is also available.
Thus , we can find out :
W = N*CL*U
W : reinforcement weight.
N : Numbers
CL : cutting length
U : Unit weight of the bar
It is advisable to prepare a bar bending schedule which is very scientific method and is also useful for cross checking at site.
Hope there is enough clarity now !

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