Calculation of Shear Force:

The shear force on an RCC beam can be calculated using the formula:

Shear Force = Shear Stress x Effective Area

Step 1: Calculation of Effective Area:

The effective area of the beam can be calculated using the formula:

Effective Area = Width x Effective Depth

Given:
Width (b) = 250 mm
Effective Depth (d) = 450 mm

Using the given values, we can calculate the effective area as follows:

Effective Area = 250 mm x 450 mm = 112500 mm²

Step 2: Calculation of Shear Force:

Given:
Nominal Shear Stress = 1.25 N/mm²

Using the given nominal shear stress and the effective area calculated in step 1, we can calculate the shear force as follows:

Shear Force = 1.25 N/mm² x 112500 mm² = 140625 N

Therefore, the shear force due to the design load coming on the section is 140625 N.

Explanation:

The shear force on an RCC beam is the force that acts parallel to the plane of the cross-section of the beam. It is responsible for causing shear stresses in the beam. In this case, the nominal shear stress is given as 1.25 N/mm².

To calculate the shear force, we first need to calculate the effective area of the beam. The effective area is the product of the width and effective depth of the beam. In this case, the width is given as 250 mm and the effective depth is given as 450 mm. Therefore, the effective area is calculated as 112500 mm².

Next, we use the formula for shear force, which is the product of the shear stress and the effective area. By substituting the given values into the formula, we can calculate the shear force as 140625 N.

In conclusion, the shear force due to the design load coming on the section is 140625 N.