Design and Analysis of Concrete Masonry and Precast Concrete .
Lintel Design Manual v t = thickness, in. V c = nominal shear strength provided by concrete, lb. V m = shear strength provided by masory masonry, lb. V n = nominal shear strength of a crosssection before appliion of strength reduction factor, lb. V r = resisting shear of lintel, lb. V s = shear strength provided by shear reinforcement, lb. w = load per unit length, lb/ft. α = tension reinforcement yield strain factor. ε y = yield strain .