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Masonry Lintels Size Limit?

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Is there a practical limit to the size of a cast-in-place masonry lintel?  A builder has asked to use grouted-in-place masonry block and rebar in lieu of a precast concrete beam.  The opening is 17ft and the depth of the lintel would have to be 6 courses deep of 8" block.  NCMA Tek 17-1b lists capacities for up to 3 course masonry lintels.
Are deep masonry lintels made with bottom course lintel blocks and then fully grouted regular block placed in running bond above that?  I can't find any design info in either the NCMA Tek notes or ACI 530 that discusses block types or shear reinforcement for this condition.
Jim Wilson, PE
Stroudsburg, PA

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