How to Calculate Quantity of Steel in Footing / Foundation | Bar Bending Schedule Table

Welcome back to Practical Civil Engineer's Channel,
I wish you a good day
If you are a technical person, you must have the knowledge about Quantity Surveying and Estimation and Costing in Civil Engineering.
Calculating the quantity of steel required for a footing involves several steps. The following steps outline a basic method:
Understand the Design: Before starting calculations, you need to have the design specifications for the footing. This includes the dimensions (length, width, and depth) of the footing, as well as the spacing and diameter of the reinforcement bars (rebar) specified in the design.
Calculate Volume of Concrete: Determine the volume of concrete needed for the footing using the formula:
𝑉
𝑜
𝑙
𝑢
𝑚
𝑒
=
𝐿
𝑒
𝑛
𝑔
𝑡
ℎ
×
𝑊
𝑖
𝑑
𝑡
ℎ
×
𝐷
𝑒
𝑝
𝑡
ℎ
Volume=Length×Width×Depth
Determine Reinforcement Ratio: The reinforcement ratio is the ratio of the cross-sectional area of steel reinforcement to the cross-sectional area of the concrete. It is typically specified in the design. For example, a common reinforcement ratio for footings might be 0.5%.
Calculate Cross-Sectional Area of Steel: Multiply the volume of concrete by the reinforcement ratio to get the cross-sectional area of steel required.
Convert Area to Length of Bars: Once you have the cross-sectional area of steel required, you can convert it into the total length of reinforcement bars needed. This involves dividing the area by the cross-sectional area of one steel bar.
Account for Bar Bending and Overlaps: In practical construction, you'll need to consider the length lost due to bending and overlapping of bars. Typically, this is accounted for by adding a certain percentage (commonly around 5-10%) to the calculated length.
Account for Wastage: It's common practice to add a percentage (usually around 2-5%) to the total length to account for wastage during cutting and handling of the bars.
Finalize and Procure: Once you have the final calculated length of steel bars, you can finalize the sizes and quantities needed for procurement.
Remember, these steps provide a basic overview, and actual calculations might vary based on specific project requirements and local building codes. It's also essential to consult with a structural engineer or follow any specific guidelines provided in the design documents for accurate calculations.
Hope to help you.
If you see this video helpful, please subscribe, like, share
Thanks you and enjoy your watching!
#PracticalKnowledge
#Constructionofbuilding
#Estimation
#SteelQuantity
#PracticalCivilEngineers
#Thumbrule
#Estimation
#Columnsteel@5%
#BeamSteel@2%
#SlabSteel@1%
#FootingSteel@0.8%
#Thumbrule
#Estimation
#Columnsteel@5%
#BeamSteel@2%
#SlabSteel@1%
#FootingSteel@0.8%