Calculating the self-weight of reinforced cement concrete (RCC) structures is crucial in structural engineering. The dead load directly impacts the stability and foundation design. Below is a step-by-step guide to determining the self-weight of RCC footings and plinth beams.

Given Data for RCC Footing:

• Base Length (L): 750 mm (0.75 m)
• Base Width (B): 600 mm (0.60 m)
• Total Height (H): 500 mm (0.50 m)
• Top Surface Length (l): 450 mm (0.45 m)
• Top Surface Width (b): 300 mm (0.30 m)
• Unit Weight of RCC (D): 2500 kg/m³

Calculation:

To determine the self-weight of the RCC footing, we use the formula:

Self-Weight = Unit Weight × Volume

The volume of the RCC footing is calculated separately as:

The volume of the RCC footing is calculated in a separate article linked below.

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Volume = 0.1904 m³

Now, calculating the self-weight:

Self-Weight = 2500 kg/m³ × 0.1904 m³ = 476 kg

Thus, the RCC footing’s self-weight is 476 kg.

Given Data for Plinth Beams:

Plinth Beam 1 (PB1)

• Span: 4500 mm = 4.5 m
• Sectional Dimensions: 230 mm × 450 mm = 0.23 m × 0.45 m

Plinth Beam 2 (PB2)

• Span: 3000 mm = 3.0 m
• Sectional Dimensions: 230 mm × 450 mm = 0.23 m × 0.45 m

Calculation:

Self-Weight of PB2:

Using the formula:

Self-Weight = Unit Weight × Volume

= 2500 kg/m³ × (3.0 m × 0.23 m × 0.45 m)

= 776.25 kg

Self-Weight of PB1:

Self-Weight = 2500 kg/m³ × (4.5 m × 0.23 m × 0.45 m)

= 1164.38 kg

The calculated self-weights of RCC structural components are:

• RCC Footing: 476 kg
• Plinth Beam 1 (PB1): 1164.38 kg
• Plinth Beam 2 (PB2): 776.25 kg

These values are critical for load distribution, ensuring stability, and preventing structural failures. Engineers must accurately calculate these values for precise structural design.

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