Spelling stresses are produced in post-tensioned pre-stressed concrete members at-a)locations of the maximum bending moment only.b)locations of the maximum shear zonec)anchorage zoned)bond-developing zoneCorrect answer is option 'B'. Can you explain this answer?

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Answer

During prestressing, spalling stresses are generated in the region behind the loaded faces of anchor blocks.

Spalling stress (bursting) occurs for the post-tensioned beam at the anchorage zone due to heavy bearing stress

At the zone between two anchorages, there is a volume of concrete surrounded by compressive stress. Forces are induced in the opposite direction to the applied forces and it forces the concrete out of the anchor block. On the other hand, the spalling stresses are set up owing to the strain compatibility relating to the effect of Poisson’s ratio. To prevent this, we use spalling reinforcement at locations of maximum bending moment

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