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SITTS & HILL ENGINEERS, INC. <br /> TACOMA, WASHINGTON (253)474-9449 JOB: 17659 <br /> DESIGNED: EMF DATE: 01/13/2019 20 <br /> PROJECT: SITE PUMPED INDUSTRIAL WASTE CHECKED: BKL DATE: 01/13/2019 <br /> 45-01 Trench <br /> Construction of a new trench is proposed to convey PIW piping from the basement at the north <br /> end of the 45-01 paint hangar to the steam line utilidor just east of the 45-01 building. The <br /> piping exits the basement at its northeast corner into the proposed trench. The proposed trench <br /> will be 3'-0" wide (inside face-inside face) x 2'-0" deep (hangar floor-inside face). Per the 45-01 <br /> as-built design drawings, a section of 14" thick heavily-reinforced slab on grade is doweled into <br /> and extends a distance of 12'-0" from the basement wall around the perimeter of the basement. <br /> The rest of the slab on grade in the hangar is unreinforced and varies in thickness between 12 <br /> and 14". The heavily reinforced section of slab on grade adjacent to the basement wall does <br /> not serve any discernible structural purpose aside from providing a stiffer section of slab on <br /> grade adjacent to the basement wall and lid. <br /> The proposed trench runs perpendicular to the basement wall, but does not run parallel <br /> adjacent to any wall segments. The longitudinal reinforcing in the proposed trench will be <br /> designed to achieve the same flexural capacity as the existing slab reinforcement ' <br /> perpendicular to the basement wall and will be doweled into the wall. This will ensure that the <br /> trench will provide similar stiffness adjacent to the basement wall as the existing slab on grade. <br /> Per the 45-01 paint hangar as-built drawings, the entire floor area within the main hangar is <br /> designed for tow truck loading of 155k plus 30% impact, and the south portion of the hangar <br /> floor subject to airplane travel is designed for an airplane truck loading of 200k. The proposed <br /> trench will be designed for the maximum static wheel loading of the 787-10, as this controls <br /> over the two loading conditions indicated on the as-built drawings. The wheel loading is <br /> retrieved from the documents available on the "Airplane Characteristics for Airport Planning" <br /> page on Boeing's website, and the excerpts are attached. <br /> 787-10 Loading: <br /> VArc;:=261787 lbf Maximum static load at aft C.G. per strut <br /> n:=4 Number of wheels per strut ' <br /> P:= Vn�c =65.45 kip Wheel load <br /> 4 <br /> p:=226 psi Tire pressure <br /> wi:=20 in Tire width ' <br /> =14.48 in Length of tire contact <br /> p•wr•lbf <br /> P,,:=1.6 P=104.71 kip Factored wheel load <br /> 1 <br />