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2002 MSJC Code Seminar Notes

2002 MSJC Code Seminar Notes

2002 MSJC Code Seminar Notes

I am trying to find where the 0.746 factor comes from when calculating the Allowable Stress Fa for ASD of unreinforced masonry bearing walls in the following example problems:

Example 2a, page 6
Example 2b, page 11
Example 2c, page 15

I did look in the ACI530/ASCE5-02/TMS 402-02 Building Code Requirements for Masonry Structure, page C-25 Eq. (2-12) but didn't find anything.

Thanks in advance for pointing me in the right direction.

RE: 2002 MSJC Code Seminar Notes

Additional question:

In example problem 2c, page 16, regarding the Stability Equation, the notes state "Moments and axial forces from lateral loads are not included in this (stability) check."

Why?  In a wall just on the verge of instablity couldn't lateral loads be enough to "push it over the edge"?

RE: 2002 MSJC Code Seminar Notes

They are just showing you the math....

The first part of the term - 0.25f'm
The second part of the term - (1-(h/140r)^2) = 0.746

They separate the two to give you a feel for the effect of the slenderness on the total allowable stress.

RE: 2002 MSJC Code Seminar Notes


Now that you turned on the light switch, it seems trivial.  It seems that I looked at that for hours, I must have been in a trance.


RE: 2002 MSJC Code Seminar Notes

Well..honestly, I poured over it for some time looking for the damned 0.746 source as well.  

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