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If you are a technical person, you must have the knowledge about Footing Reinforcement Detail and How to Calculate Steel Quantity in Footing or How to Calculate Quantity of Steel in Footing, What is Bar Bending Schedule.
Calculating the steel quantity in a footing involves a few steps, primarily focusing on determining the total steel reinforcement required for the footing based on its dimensions and the structural requirements. Here’s a step-by-step guide:
Step 1: Understanding the Design Requirements
Design Drawings and Specifications: Obtain the structural drawings and specifications that detail the dimensions of the footing, concrete strength requirements, and reinforcement details.
Load and Stress Considerations: Understand the load-bearing requirements for the footing, which dictate the reinforcement needed to resist tension and shear forces.
Step 2: Calculate Total Reinforcement Area
Calculate Cross-sectional Area of Footing: Determine the cross-sectional area of the footing by multiplying its length (L) by its width (W). Let’s denote this as
𝐴
𝑓
=
𝐿
×
𝑊
A
f
​
=L×W.
Determine Reinforcement Ratio: This is typically provided in the design specifications and is expressed as a percentage of the cross-sectional area of the footing (
𝐴
𝑓
A
f
​
). For example, if the reinforcement ratio is 1%, then
𝐴
𝑠
=
0.01
×
𝐴
𝑓
A
s
​
=0.01×A
f
​
.
Calculate Total Steel Area (
𝐴
𝑠
A
s
​
): Multiply the cross-sectional area of the footing by the reinforcement ratio to find
𝐴
𝑠
A
s
​
.
Step 3: Convert Steel Area to Quantity of Bars
Bar Diameter and Spacing: Determine the diameter of the reinforcement bars (rebars) specified in the design. Also, understand the spacing (center-to-center distance) between these bars.
Calculate Number of Bars: Divide the total steel area (
𝐴
𝑠
A
s
​
) by the cross-sectional area of one bar (
𝐴
𝑏
A
b
​
), where
𝐴
𝑏
=
𝜋
×
𝑑
2
4
A
b
​
=
4
π×d
2
​
(for a round bar). Here,
𝑑
d is the diameter of the bar.
Round Up to Whole Numbers: Since bars are usually whole numbers, round up the calculated number of bars to the nearest whole number. Check against the spacing requirements to ensure it fits within the dimensions of the footing.
Step 4: Prepare Bar Bending Schedule (BBS)
A Bar Bending Schedule (BBS) is a detailed report that provides information on the reinforcement placement, shape, size, quantity, and dimensions for each bar in a structure. It includes:
Bar Marking: Each bar is identified with a unique mark or number for easy identification and placement.
Cutting Lengths: Lengths at which each bar needs to be cut from the stock length to fit the structure.
Shape and Bends: Details of bends, hooks, and cranks in the bars as per design requirements.
Quantity: Total number of bars of each type and size.
Weight: Weight of steel reinforcement used.
Explanation of Bar Bending Schedule (BBS)
Header Information: Project name, location, drawing number, and other identifiers.
Rebar Details: Includes the bar mark, diameter, number of bars required, cutting length for each bar, shape codes for bends and hooks, spacing details, and additional notes as specified by the design.
Summary: Provides a summary of the total quantities of each diameter of bar used, total weight of steel reinforcement, and any other pertinent information.
Example Calculation
Let’s say you have a footing with dimensions 2m x 2m and a reinforcement ratio of 1%.
Cross-sectional area
𝐴
𝑓
=
2
𝑚
×
2
𝑚
=
4
𝑚
2
A
f
​
=2m×2m=4m
2
Total steel area
𝐴
𝑠
=
0.01
×
4
=
0.04
𝑚
2
A
s
​
=0.01×4=0.04m
2
If you are using 12mm diameter bars (assuming
𝑑
=
12
𝑚
𝑚
d=12mm):
Area of one bar
𝐴
𝑏
=
𝜋
×
(
12
𝑚
𝑚
)
2
4
≈
113.1
𝑚
𝑚
2
=
0.0001131
𝑚
2
A
b
​
=
4
π×(12mm)
2
​
≈113.1mm
2
=0.0001131m
2
Number of bars
=
0.04
0.0001131
≈
353.3
=
0.0001131
0.04
​
≈353.3
Hope to help you.
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