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Load Criteria <br />Joist Designation: 30K224/128 Bar Joist <br />Length of Joist L = <br />(E) Dead Load <br />DL @ Joists See As-Builts <br />(N) DL (Skid) Cancelled Weight due to Live Load <br />Skid #1 Weight -= <br />Skid #2 Weight -= <br />Max Pt Load per Joist PDL =@ 26'-11" From End <br />Distance to CL. Of Skid d1 =Max <br />d2 L - d1 <br />(E) Live Load at Roof Level <br />Tributary Area TA = <br />Live Load LL = Reduced <br />Beam Capacity <br />Design Load of Beam wAll = <br />Add. Pt. Load @ Chord Point Pall = <br />Allowable Moment Ma =wAll * L2 / 8 + Pall * L / 4 <br />Required Moment M1 =w * L2 / 8 (E) DL + LL <br />M2 =PDL* d1 * d2 / L (N) DL <br />M = <br />M / Ma = <br />Check Local Bending in Joists <br />Angle Size <br />Chord Length L = <br />Point Load PDL = <br />Distributed Load wDL = <br />wLL = <br />Moment M = <br />Section Modulus S = <br />Bending Stress fb = <br />Allowable Bending Stress Fb = <br />DCR = <br />Target 1441 W. 17th St. Santa Ana Solar Rooftop Project <br />12.0 psf <br />NS STRUCTURAL ENGINEERING, INC MADE BY: JL <br />4642 Rockland Place La Canada <br />Flintridge, CA 91011 <br />CHECKED BY: NS <br />PAGE NO. <br />48.83 ft <br />647 lbs <br />324 lbs <br />459 lbs <br />244 lbs <br />1,106 lbs <br />568 lbs <br />72,876 lb-ft <br />1,010 lb-ft <br />93.01% <br />66,771 lb-ft <br />67,782 lb-ft <br />2.0 ft <br />275 lbs <br />96.0 plf <br />WeightArea <br />224.0 plf <br />500 lbs <br />275 lbs <br />390.7 ft² <br />16.2 psf <br />40.0 ft² <br />4.00 ft <br />44.83 ft <br />Therefore, Skids @ Center of Beam span is Acceptable <br />& skids shall be independently centered between different joists. <br />20.0 ft² <br />250 lb-ft <br />0.488 in³ <br />6,155 psi <br />21,557 psi <br />0.29 <br />(2) L2x2x1/4" <br />129.5 plf <br />1441 W 17th St - 101115926 & <br />20180369 <br />11/16/2023