Hoop Tension generated in RCC Circular Water Tank Calculator

Hoop Tension Formula:

\[ H_t = \frac{d \times h \times D}{2} \]

Hoop Tension (N):

1. What is Hoop Tension in RCC Circular Water Tanks?

Definition: Hoop tension is the circumferential stress that develops in the walls of a circular water tank due to the internal water pressure.

Purpose: Calculating hoop tension helps engineers design reinforced concrete (RCC) water tanks with adequate steel reinforcement to resist these tensile forces.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ H_t = \frac{d \times h \times D}{2} \]

Where:

\( H_t \) — Hoop tension (Newtons)
\( d \) — Density of water (N/m³)
\( h \) — Depth of water in tank (meters)
\( D \) — Diameter of tank (meters)

Explanation: The formula calculates the tensile force per unit height of the tank wall at any depth.

3. Importance of Hoop Tension Calculation

Details: Accurate hoop tension calculation ensures the tank walls have sufficient reinforcement to prevent cracking and failure under water pressure.

4. Using the Calculator

Tips: Enter water density (default 10000 N/m³), water depth, and tank diameter. All values must be > 0. Results include ±5% margin.

5. Frequently Asked Questions (FAQ)

Q1: Why is hoop tension important in tank design?
A: Concrete is weak in tension, so we need to calculate hoop tension to determine the required steel reinforcement.

Q2: Does this calculation consider safety factors?
A: No, this is the theoretical hoop tension. Design codes typically require applying safety factors to this value.

Q3: How does water depth affect hoop tension?
A: Hoop tension increases linearly with water depth - maximum at the base, zero at the water surface.

Q4: What's the typical density value for water?
A: 10000 N/m³ (or 10 kN/m³) is standard, but may vary slightly with temperature and impurities.

Q5: How do I use this result for reinforcement design?
A: Divide hoop tension by allowable steel stress to get required steel area per unit height of tank.