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<br />97 <br /> <br />--+ <br /> <br />Example: <br /> <br />, <br />Continuing with the example for basement wall design, the starting point here is water <br />depth of 4.8 feet assuming the owner had the IJiISl~"lent wall ,installed to that depth. Assume <br />the basement is 24 feet wide with two 12 foot spansl The decision is made to use #4 rein- <br />forcing bars. Entering Figure 11.14 at a 4.8 foot dept~ of water, there are three possible <br />choices. For a four-inch thick slab, the bar spacing wq,uld be five inches (nearest half inch). If <br />a five-inch slab is used, the bar spacing would be Illh! inches. Or. an 11-inch spacing could be <br />used if the slab were six inches thick. <br /> <br />STRUCTURAL PLAIN CONCREtE <br />(Unre i nforcedj--:.- <br /> <br />o <br />'" <br /> <br />f' <br />c <br /> <br /> <br />o <br />U <br />ftu <br /> <br />ftu <br /> <br />.9 <br />I.. : <br />J.2~ ,ff~ + 7 psi <br /> <br />per0issible stress in <br />tent ion in concrete <br />wa 1\ th i ckness <br /> <br /> <br />a H <br /> <br />7 <br /> <br />Ultimate Strength Design <br /> <br />~ <br />. <br />. <br />~ <br /> <br />. <br /> <br />6 <br /> <br />'" <br />c <br /> <br />'0 <br />. <br />o <br />~ <br /> <br />Joob ps i <br /> <br />DESIGN <br />ASSCiM-PTION~_ <br />H = 81-011 <br />::: 8" <br /> <br />PH = Yw x a <br /> <br />" <br />. <br />~ <br />. <br />:2 <br />..... <br /> <br />5 <br /> <br />2500 psi <br /> <br />~ <br />o <br /> <br />. <br /> <br />~ <br />-c <br />'" <br />. <br />X <br /> <br />3 <br /> <br />o <br /> <br />50 <br /> <br />100 <br /> <br />150 <br /> <br />20b <br /> <br />250 <br /> <br />300 <br /> <br />Working load (Yw) (or Equivalent F1IJid \ieight) (pcf) <br /> <br />Figure 11.7 Ultimate strength design example. for 8" unreinforced concrete walls. <br />(Reference 26). <br />