Graphical methods in reinforced concrete design . left margin where the re-quired value for dn may he read. Example:- TThat is the necessary thickness of a slabof 1£ foot span to carry a superimposed lead of 150pounds per square inch? The specifications callfor an assumption of l/l2 wl^as the bending moment. Prom the unit stresses allowed in this case, itis found that R = 120. The problem gives 1 = 12and c = 12. Assuming the slab to be 12 inchesthick, w = 150 -t 150 = 300 Lbs. Traveling along thevertical from P. = 120, to the first heavy diagonal,then forizontally to the left to the line marke
Graphical methods in reinforced concrete design . left margin where the re-quired value for dn may he read. Example:- TThat is the necessary thickness of a slabof 1£ foot span to carry a superimposed lead of 150pounds per square inch? The specifications callfor an assumption of l/l2 wl^as the bending moment. Prom the unit stresses allowed in this case, itis found that R = 120. The problem gives 1 = 12and c = 12. Assuming the slab to be 12 inchesthick, w = 150 -t 150 = 300 Lbs. Traveling along thevertical from P. = 120, to the first heavy diagonal,then forizontally to the left to the line marked 1/12,then vertically to the line w = 300, horizontally tothe other heavy diagonal, vertically to lr = 12, and tothe left, to d = This shows that the assump-tion regarding- the thickness and dead load of the slabwas high. Therefore a second assumption is made for (44) & = 6 inches and w = 150 75 and the process±i repeated and d,T is found to he inches. ins. for imheddinj the steel, makes the depth ofthe slah 6 AMMOXTB ** -
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