3003 W CASINO RD BLDG 45-06 2025-07-17

SITTS & HILL ENGINEERS, INC. TACOMA, WASHINGTON (253)474-9449 JOB: 17659 DESIGNED: EMF DATE: 01/13/2019 23 PROJECT: SITE PUMPED INDUSTRIAL WASTE CHECKED: BKL DATE: 01/13/2019 Trench Lid Design: ' The proposed trench lids will be constructed of precast concrete panels. The panels will span the trench width, be 8" thick to provide adequate punch shear capacity, and typically be 3'-9" (nominal) wide to ensure that no panel will experience more than a single main strut ' wheel load for the planes in production at Everett. This also keeps the weight and size of the panels at a manageable lifting load for a light forklift, with the panels weighing approximately 1500Ibs. The concrete panels will be reinforced and cast into a C8x18.75 welded channel assembly, and shear studs will be provided around the perimeter. W8x24 beams will be ' provided at unsupported trench lid bearing edges at corners or turns in the trench alignment, but these turns will be located near the edge of the hangar in areas that will not be subject to airplane wheel or tow truck loading. The following limit states are checked to determine the ' adequacy of the precast panels: Punching Shear: :=0.75 Strength reduction factor for shear per ACI 318-14 Table 21.2.1 ' f''.:=4000 psi Compressive strength of concrete A:=1.0 Factor for normal-weight concrete ' b:=45 in Width h:=8 in Thickness of precast panel ' db:=0.625 in Diameter of reinforcement c,.:=0.75 in Clear cover to reinforcement d:=h—c(—0.5 d,,=6.94 in Depth to reinforcement wr ' 6:=—=1.38 Ratio of long to short side of load area if bo:=2 (w,+d)+2 (l,+d)=96.71 in Punching shear perimeter ' a,:=40 ACI 318-14 Section 22.6.5.3 4•min 4 A• f',. ,(2+±).A. fi (2+ o .db°(I)V„ kip=127.30 kip 1000 Design punching shear strength per ACI 318-14 Table 22.6.5.2 ' OV„=127.30 kip> P„=104.71 kip Punching shear strength OK