In a circular water tank (resting on ground, with rigid base), the hoop tension near the base is:
Choose the correct answer
Maximum at base, zero at top
Zero (or near zero) at rigid base due to restraint; maximum at a height above base (approximately H/3 to H/2)
Uniform throughout height
Always zero in circular tanks
Correct Answer
B. Zero (or near zero) at rigid base due to restraint; maximum at a height above base (approximately H/3 to H/2)
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Circular tank with rigid base: at base, wall is restrained → hoop tension = 0 (restrained, so acts as cantilever — bending stress). At mid-height and top: hoop tension = γw × h × r where h = water head, r = radius. Wall designed for combined hoop tension + bending at different levels. IS 3370 provides moment and tension coefficients for various H/D ratios.
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