For a circular RC water tank with rigid base, the hoop tension is maximum at:
Choose the correct answer
At the base (maximum water pressure)
Approximately mid-height (base restraint reduces hoop tension there; free top — parabolic distribution with max at ~mid)
At the top (freeboard level)
Constant throughout height
Correct Answer
B. Approximately mid-height (base restraint reduces hoop tension there; free top — parabolic distribution with max at ~mid)
Why is this the answer?
Circular water tank (IS 3370, rigid base): at the base — restrained from expansion → zero hoop tension at base; increases to maximum at mid-height then slightly reduces near top (free). Free top: hoop tension T = γwH×R at that depth. Near rigid base: restraint causes vertical cantilever BM. Critical design: (1) Hoop tension in cylindrical wall; (2) Vertical BM near base. IS 3370 provides design tables.
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