TM 5-809-3/NAVFAC DM-2.9/AFM 88-3, Chap. 3
pounds per cubic foot. Weights of lighter-weight units may be obtained by direct proportion to the lighter
weight of concrete being used. Table 5-5 gives the weight of concrete masonry unit walls.
Table 5-6 gives the average weights, gross and net areas of concrete masonry units.
5-4. Working stress design equations. The equations in this paragraph are the basic working stress
equations used in the design of reinforced masonry.
a. Flexural design rectangular sections. The design assumptions, coefficients and cross section geometry
used in the derivation of the flexural design equations for rectangular sections are illustrated in figure 5-3.
5-5
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