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<br />XI.) Vertical Wall Reinforcing: <br />A.) Input Data: <br /> Eave Height (H) = 8.0 ft <br /> % Filled Cells = 5% <br /> Wall Dead Load= 50 psf <br /> Area of Mortar= 30 si <br /> Mortar fin = 1800 psi <br /> As= 0.31 si I bar <br /> Bond Bm. width = 8 in <br /> <br />Bond Bm. height = <br />Ft grouted = <br /> <br />8 in <br /> <br />Ft ungrouted = <br /> <br />68 psi (Normal) <br />25 psi (Normal) <br /> <br />Ft parallel = <br />Em= <br />Es= <br /> <br />50 psi <br />2.40E+06 psi <br />2.90E+07 psi <br /> <br />B.) Design Parameters: <br /> <br />Allowable flexural tension (Ft) <br />Ft= 27.2 pSI <br /> <br />( One in twenty, 13' - 4" assumed) <br /> <br />(NCMA TEK 141A) <br />Type S, M = 2500 <br /> <br />N= <br /> <br />12 <br /> <br />(ACI 530, 6.3.1.1) <br /> <br />Allowable flexural tension incl dead load (Ft'), (Exclude bond bm. DL due to uplift) <br />Ft' = 1.333 x Ft + fa (compressive stress) = 48.4 pSI (ACI 530, 5.3.2) <br /> <br />Effective Wind Area (Aw) = <br /> <br />64 <br /> <br />sf <br /> <br />1.20 <br /> <br />GCp= <br /> <br />C.) Check maximum Velocity Pressure (Vp max) for unreinforced masonry wall: <br /> <br />M = W x L^2 I 8 <br /> <br />Sx= <br /> <br />ci I Lf <br /> <br />81 <br /> <br />= <br /> <br />Ft' X Sx <br /> <br />(NCMA TEK 141A) <br /> <br />Therefore, W = 8 X Ft' x Sx I L^2 = 40.8 psf <br /> <br />psf Which is > Actual Vp. Therefore no reinf req(~ <br /> <br /> <br />J s~~o,P.E. <br />Page 10 j 8/l/95 <br />P <br /> <br />And Vp max = W I GCp = <br /> <br />34.0 <br />