The ratio of M/(Vd) will always be taken as a positive number. The values of Fvm and Fvs may be increased

by a factor of 1.33 when wind or seismic loads are considered in the loading combination.

Where:

V = The total shear load, pounds.

t = The actual thickness of shear wall section for solid grouted masonry or the equivalent thickness

of a partially grouted hollow masonry wall, inches. (See Chapter 5 for the equivalent thicknesses).

d = The actual length of the shear wall element, inches.

(To be more exact, the actual wall panel length minus the tension reinforcement cover distance may be used).

When the allowable shear stress, Fvm, is exceeded, horizontal and vertical shear reinforcement must be

provided. The horizontal shear steel will be designed to carry the entire in-plane shear force. The area of

shear reinforcement, Av, will be determined as follows:

Where:

s = The spacing of the shear reinforcement, inches.

Fs = the allowable tensile stress in the reinforcement, psi.

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