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72 Desi Manual for Se ntai Retainin Wa}ls � <br /> � <br /> 4.5.2 VJEIGHT OF SEGMENTAL,RETAINING WALL � <br /> ; <br /> � <br /> � <br /> The weight Ww of the column af SR�V units on the leveYing pa+d is bas�d on the hittge b:ei,ght H� of 4 <br /> the wall facing (Equatio�4-1 or 4-2) and the weight per unit vol�me of SRW units yr. The SRW { <br /> wall weight W,Y per Iineal foot acting at the base will be Iimited by the hinge height Hh and car�be <br /> calculated as: <br /> [Eq.4-9] � <br /> � <br /> � <br /> W�,•=HtiYuW <br /> t <br /> ff the hinge height calculatcd accarding to Equataon 4-1 is larger ti�an the actuat wall height.I�, then 3 <br /> i <br /> the wat!height H shauld bc useti as ttle Ilit3ge height(i.e.,,i�h=A}as in Fquatian 4-2. ; <br /> ; <br /> � <br /> 4.5.3 BASE SLIDING � <br /> ; <br /> The exterrnal forces acting to destabiaize tho conventional single depth SRW aze shown in Figure 4- � <br /> 4. � <br /> ; <br /> 4 <br /> The base sliding resistance is calculated as fol4ows: ° <br /> ; <br /> [Eq. 4-10] <br /> Rsnv� -f�n E�i,��an ¢ -y- c GV} <br /> The SRW weight Ww zs calcvlated us:ung Equation 49. <br /> The soil str�ng[h parameters c and �shvuld be selected accarding to the soal type upon which�he <br /> SRW unit is founcted. Narn�aliy, this vu�ll be an aggregate Ieveling pad_ For some pro�ects, thc <br /> base unit may rest on the foutldation soils. Tt� either case,the available sliding resi�tanc� must be <br /> rac3uced by a masonry friction reduction factor,ub applied to thc u�derlying soal frictiran coeffieient <br /> t�n �and e. This fac;to�'aCCotii�is fpc r�edueed s�ear resistat�ce dt�e to the reiatively smooth m�,sonry <br /> unit sliding acro§s soil deternuned from lazge scale test�ng. Actual tcst data specifiC to Soil type atid <br /> SRW unit shou�d be used in design. In the absence of specific test data a reasonable v��ae for� <br /> may be selected using`Table 42. <br /> TABLE 4-2 <br /> t'�iasonry Friction Reductian Factor,�,, [Itef.27] <br /> Soii Soi! Masonry Friction <br /> Type � Reductian F�coor <br /> (USCS) {Deg} ,�.r,, <br /> (3W,GP 37-42 0.7 <br /> GM,SW,SP 3�-4[l O.GS <br /> GC,SM,SC 28-35 Q.�i <br /> ML,CL 25-32 D.SS <br />