Retaining walls; their design and construction . Fig. 84. Fig. 85.—Graphical analysis of abutment. (a) The resultant intersects the third point (Checking the tabular value)and R = + = Si = 65 = kips per square foot. The permissible soil intensityin this and the following work is taken as 4 tons per square foot. (b) The resultant intersects at the 5^^ 7 point, and from (39) ^^i = T^~i(2 — 3 X ) = 7 kips per square foot; which is within the value. S2 = Y^i — OAi) = 2120 pounds per square foot, or 15 pounds per square inch. This tensile stress in the co

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Retaining walls; their design and construction . Fig. 84. Fig. 85.—Graphical analysis of abutment. (a) The resultant intersects the third point (Checking the tabular value)and R = + = Si = 65 = kips per square foot. The permissible soil intensityin this and the following work is taken as 4 tons per square foot. (b) The resultant intersects at the 5^^ 7 point, and from (39) ^^i = T^~i(2 — 3 X ) = 7 kips per square foot; which is within the value. S2 = Y^i — OAi) = 2120 pounds per square foot, or 15 pounds per square inch. This tensile stress in the concrete, developed under a craneload prior to the setting of the span, is a permissil)lc stress. (c) This condition is quite similar to the preceding one, with the excep-tion that the indeterminate factor of the frictional resistance between thegirder bearing and the abutment, together with the dead weight of the spanadd to the wall stability. {(I) For this case (that of full loading) the resultant is foimd to intersectexactly at the third

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