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Anchor Bolts Again

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Does anybody know why the tensile strength of an anchor
bolt in concrete is so much higher than in masonry?
(Assuming the stress in the bolt governs)

Concrete: Pss = 0.9Ab(fut)
Masonry: Btn = 0.4Ab(Fy)

For an A36 rod I get: Pss = 0.9Ab(58) = 52.2Ab
                               Btn = 0.4Ab(36) = 14.4Ab

Am I missing something?

Mark Pemberton, P.E..

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