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O- 10 <br />Z <br />LL. 9 <br />U <br />a <br />C) <br />81 <br />0 7 <br />jj <br />U. <br />�. 6 <br />y <br />O 5 <br />J <br />0 4 <br />W <br />O <br />3 <br />C9 <br />w 2 <br />12'/2" HOLLOW CORE SLAB <br />150 PSF <br />����■�Vent <br />Notch9 <br />■ <br />Number <br />of <br />Filled <br />Voids <br />requiredto <br />■ <br />J4 <br />r 2'-0" <br />at each <br />end of each <br />slab. <br />.Kne.. <br />_ <br />��■ <br />p <br />�� <br />■ <br />■►■� <br />►-ft <br />r� <br />16 18 20 22 <br />,�.Jfi <br />24 26 28 30 32 34 36 38 <br />SIMPLE SPAN (ft) <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 falling 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, soil cover unit weight is assumed to be 120 pcf. <br />7.) Minimum span length = 14'-01' <br />. <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 height of soil cover that can be supported by slabs <br />with 6'/2" standard notches in adjacent slabs to accommodate 12" diameter vents, assuming void fill concrete fc = <br />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 9 <br />