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Question
In the case of designing a water tank with Limit State Method, to control the cracking, the maximum stress in HYSD steel bars should not exceed:
A.
115 MPa
B.
125 MPa
C.
130 MPa
D.
150 MPa
Answer ( Option C)

130 MPa

Solution

As per codal provisions of IS 3370:
• Part of structure retaining liquid and enclosing space above liquid should be taken under server exposure condition.
• Maximum cement content is 400 kg/m³ to take care of shrinkage effect.
• Minimum cement content is 320 kg/m³.
• Minimum grade of concrete is M30.
• Maximum allowed crack width is 0.2 mm in LSM design.
• To reduce cracking due to temperature, shrinkage and moisture loss at an early stage of concrete, curing should be done for at least 14 days.
• All the structures to be designed shall be designed for both empty and full condition.
• Cracking of concrete can be controlled to some extent by maintaining slope filling rate of 1 m in 24 hours at the first time of filling.
Permissible stress of the material is as follows:
a) Mild Steel - 115 N/mm² and HYSD bar - 130 N/mm²
b) Concrete
Grade Direct Tension Bending Tension
M25 1.3 N/mm2 1.8 N/mm2
M30 1.5 N/mm2 2.0 N/mm2
• If the thickness is more than 200 mm, the reinforcement is provided in 2 layers, one on each face.
• Minimum steel is 0.64% and 0.4% of the surface zone for mild steel and HYSD respectively.
• The above percentage values can be reduced to 0.35% and 0.24% for tank with no dimension more than 15 m.

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