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<br />95 <br /> <br />-.., <br /> <br />Type: Structural Plain Concrete (Ultimate Strength Oe~ign) <br />4.716(3.25 Vfe (( 7) 21' <br />Yw~ <br />a' (B 2lX vl:l) 12 <br />3 <br />Type: Plain Masonry Block (Working Stress Design) <br /> <br />No Grout <br />yw ~ (1.1 )(6.0) (s,) (24/12) <br />aJ (B +2a V-Q.) <br />3 3 <br /> <br />Solid Grout <br /> <br />yw = (1.1)(6.0)(st)(41/12) <br />a' (B. 2a va) <br />3 3 <br /> <br />Type: Reinforced Masonry Block (Working Stress De"igp) <br /> <br />yw = (1.1)(6.0)(30.37d2)(1,000) <br />aJ (B+2a va) 1 000 <br />3 '3' <br /> <br />Based on a particular wall design, and the illlowable : yw the allowable height of soil/water <br />loading has been cillculated. This has been done for ltn eight foot high wall for eilch type of <br />wall construction. The information has been plotted a~d is shown in Figures 11.8 through <br />11.14 along with cross sections. A simple step-by-step: procedure for using the design figures <br />is listed here prior to an example, <br /> <br />1. <br /> <br />Compute Yeq for site. <br /> <br />2. <br /> <br />Go to figure for desire type of wall. <br /> <br />3. <br /> <br />Move vertically upward from equivalent fluid weight to intersection with curve of the <br />desire wall thicknesses. Then move horizontally I"ft 1:0 find allowable height of soil/ <br />wilter loading. <br /> <br />4. <br /> <br />If 10ilding height is lower the desired for a buildi~g in the design stage, try one or more <br />of the following: a) select the higher strength coricrete, fe' @ 3,000 psi.; b) select the <br />greater wall thickness; c) select a stronger wall tYl>e; d) select the smaller spacing for <br />reinforcement. <br /> <br />J. <br /> <br />If loading height is greater than five feet, see disqussion of buoyancy considerations, <br />Section 11.7. <br /> <br />Example: <br /> <br />A house with basement is being designed for a partiqular site. The homeowner desire" a <br />basement of 12-inch thick plain masonry block with scblid grout in the cavities. He wants to <br />know how deep he may put the basement. Assume a '"oil/water loading condition of h less <br />than 0.25 (Chapter VI). From Table 6.1 assume a Yeq! is chosen for the kind of soil at the <br />site and that value is 97 pd. <br /> <br />Enter Figure 11.9 at Yeq of 97, move up to the cur~e for solid grout, then move over to <br />find the allowable loading height of 4.8 feet. ThiS IS lefs than the limit for buoyancy, so the <br />homeowner may place the bottom of the wall up to aj maximum of 4.8 feet deep. <br />