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12 <br />11 <br />O 10 <br />J <br />U. 6 <br />W <br />W <br />O 5 <br />0 4 <br />0 <br />3 <br />Z <br />t9 <br />UJ 2 <br />4 0 <br />14 <br />121/2" HOLLOW CORE SLAB <br />HS25-44 <br />Number <br />for 2'-0" <br />of Filled Voids <br />at each end of each <br />required <br />slab. <br />I <br />.��I.vtj <br />Vent - <br />■ <br />� <br />`iii�a•t�� <br />�TOMa <br />11 <br />�-- <br />■ <br />��" <br />_ <br />�� <br />t�P! <br />16 18 �2(0� 22 <br />11'!/' <br />24 26 28 <br />SIMPLE SPAN (ft) <br />30 32 34 36 38 <br />GENERAL NOTES: <br />1.) A minimum cover depth of six inches OR a three inch thick cast in place concrete topping slab is required. <br />2.) Simple Span is centerline of bearing to centerline of bearing. <br />3.) The Knee Wall envelope represents the maximum span and height of soil cover that can be supported by slabs <br />with standard notches for manhole openings, assuming void fill concrete fc = 3,000 psi. Points failing outside this <br />envelope require knee walls to support the slabs at manhole openings. <br />4.) Interpolation between strand contours is acceptable. DO NOT extrapolate beyond the bounds of this chart. <br />5.) Soil cover is assumed to be uniform. <br />6.) Except as noted, sail cover unit weight is assumed to be 120 pcf. <br />7.) Minimum span length = 14'-0". <br />8.) The values shown on this chart are in compliance with IBC 2015 & ACI 318-14. <br />9.) The Vent Notch envelope represents the maximum span and minimumimaximum height of soil cover that can <br />be supported by slabs with 6'/" standard notches in adjacent slabs to accommodate 12" diameter vents, assuming <br />void fill concrete fc = 3,000 psi. Refer to Detail 3 on page 13 of this brochure for vent notch details. <br />1/03117 MANUFACTURERS OF PRESTRESSED CONCRETE • TACOMA, WASHINGTON 8 <br />