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The unit weight of steel bars can be calculated using the formula for the weight of a cylindrical object, which takes into account the density of steel and the cross-sectional area of the steel bar. Here’s the formula:

Unit weight of steel bar=Cross-sectional area×Length×Density of steel

The cross-sectional area of the steel bar can be calculated using the formula for the area of a circle:

Where:

• Diameter: Diameter of the steel bar in inches or millimeters.
• Length: Length of the steel bar in inches or feet (for imperial units) or in millimeters or meters (for metric units).
• Density of steel: The density of steel is typically taken as 7850 kilograms per cubic meter (kg/m³) or 490 pounds per cubic foot (lb/ft³), although slight variations may occur depending on the specific grade and composition of the steel.

Here’s a step-by-step example of how to calculate the unit weight of a steel bar:

1. Determine the diameter of the steel bar (in inches or millimeters).
2. Calculate the cross-sectional area using the formula:
3. Determine the length of the steel bar (in inches or feet for imperial units, or in millimeters or meters for metric units).
4. Multiply the cross-sectional area by the length and the density of steel to obtain the unit weight of the steel bar.

For example, let’s say we have a steel bar with a diameter of 1 inch and a length of 10 feet:

Unit weight of steel bar=0.7854 square inches×(10 feet)×(490 lb/ft3)

Unit weight of steel bar≈3846 pounds

So, the unit weight of the steel bar is approximately 3846 pounds.

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