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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