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Masonry Strength Design

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What is the maximum reinforcement ratio ?.
UBC Section 2108.2.4.2 limits rho=0.5 rho(bal) for slender walls.  
Is this limit applicablle to beam design?
MIA Handbook has strength design tables with 0.75 rho(bal) limiting value.
Can this limit be used for masonry beam design. The design tables have a
foot note indicating 75% limit per UBC Sec. 1910.3.3 ( Concrete).  Is there
any mention in UBC to use 75% limit for masonry design?. Is the strength
design limited to slender wall?

Thanks in advance for help.

Sid Lakhani,  PE