Rectangular and Circular underground water tank
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The document compares rectangular and circular underground water tanks, discussing their design, stress resistance, and structural efficiency. Circular tanks have greater structural strength and better pressure resistance, while rectangular tanks are more economical for smaller capacities. Additionally, circular tanks maintain a more constant temperature and are easier to clean due to their lack of corners.
Rectangular and Circular underground water tank
- 1. COMPARING RECTANGULAR (CUBIC) AND CIRCULAR (CYLINDRICAL) UNDERGROUNDWATERTANK Underground water tank: Reinforced concrete water tanks are constructed for storing water. The design depends on the location of tanks, i.e. overhead, on ground or underground water tanks. Underground water tank can be divided into rectangular or circular in shape. Properties Rectangular Underground Water Tank Circular Underground Water Tank When to construct? When capacity of liquid to be stored is small Capacity of liquid to be comparatively large Maximum Principal Stress The rectangular and circular water tanks of the same capacities may have stress results less than circular tanks. e.g. for a capacity for both types, the maximum stress calculated for rectangular water tank was 5.32N/mm2 Greater than rectangular tanks e.g. For circular water tank, 7.1N/mm Resistance to pressure Less In case of resistance to all pressure exerted in the tank circular is better. Area of steel Area of reinforcement of circular tank is greater Less
- 2. Formwork Formwork in rectangular tank is greater than the circular water tank. Formwork required is less. The formwork would be significantly more challenged in the construction of the circular tanks Amount of Concrete Less Amount of concrete in circular tank is greater than that of rectangular tank Reinforcement Less Amount of reinforcement tonnage in circular tanks is greater than that of rectangular tank. Surface Area Greater surface area A cylindrical water tank has the least possible ratio of circumference to area i.e. less surface area than a box-shaped water tank that holds the same amount of water Economical comparison For smaller capacities rectangular shape tank is economical and for large capacities circular shape tank are economical. Due to less surface area, a spherical water tank requires less building material than its box- shaped equivalent and is consequently more economical to build Structural strength Less in terms of structural strength A round structure is the strongest geometrical structure and is stronger than box-like alternatives. Therefore, a round structure will more successfully withstand the outward-directed force of the water stored within and the force of wind and rain that have an effect upon the structure from without.
- 3. Constant Heat Level Less resistant to heat and cold Round structures minimize surface area through which heat can radiate, they keep the enclosed water at a more constant temperature than box- like structures. As a result, the water is less affected by ambient temperature fluctuations and also loses less heat in winter and gains less heat during the summer Cleaning and Hygiene Cubic tanks have corners and it’s difficult to keep the corners clean, also, corners are known to harbour microbes Round tanks are much easier to keep clean than those with corners Pictures
- 4. Terms: Maximumprinciple stress:This theory or normal stress theory says that, yielding occurs at a point in a body, when principle stress (maximumnormal stress) in a biaxial systemreaches limiting yield value of that material under simple tension test. According to strength of materials brittle one strong in shear, weak in tension or compression. That's why this theory preferred for brittle materials.