2707 COLBY AVE CINGULAR WIRELESS ANTENNAS 2021-11-01

• Project#:GED-328/7170287 lir U Date:8/17/2017 Site#:WA6064/FA#10013187 MORRISON HERSHFIELD By:NM Roof Slab Check: The slab spans one way on PT Beam joists framing into spandrel edge beam and an interior girder.[Original Design Sheet 52.15] Sled Mount one-way slab strip I -.- Bwz--_ ___ -awz- - --- —8102- -- I i :Ij' .4 _ ii a, O! :_� O: O� mm I' m, b mb:: rO �. imn ii ,. ,I 1. 11 II I I 1, I I 11 11 11 11 The following design material data have been used as specified in the original design drawings: Concrete Compressive Strength,f'c: 5500 psi [Sheet S0.01] Concrete Unit Weight,yc: 150 pcf [Normal Weight] Steel Reinforcement Yield Strength,f,,: 60,000 psi [Sheet 50.01] 5"Concrete Slab with reinforcement not exceeding: #4 @ 10" [Sheet S4.02 Slab Schedule] The capacity of the existing rooftop slab has been evaluated for the increase in the loads from the sled mount and ballast and found to be adequate to support the increase in loads! [See attached calculations]. Roof Beam Checks: The roof PT Beam joists frame into edge spandrel beam and an interior girder. [Sheet S2.15]. From site visit photos,the sled mount frame and ballast loads are modeled to evaluate the critical strength and serviceability requirements. The following design material data have been used as specified in the original design drawings: Presteressing strand designation: ASTM416 [Sheet S0.01] Concrete Compressive Strength at initial prestress,f' : 3000 psi [Sheet S0.01] Concrete Compressive Strength at service level,Yc: 5500 psi [Sheet S0.01] 1/2" Dia.Strand Area: 0.153 in2 [Sheet 50.01] Stand ultimate strength fP,,: 270 ksi [Sheet 50.01] Anchoring Stress,fsl: 189 ksi [Sheet S0.01] Effective design stress,fse: 175 ksi [Sheet S0.01] . SUPT SPAN L) SUPT TENDON C.G.S. L t L 7 '� 'r LT• 5 LT•5 'pi* 2" TV BAR LEFT CL2RTYP CST Li) TOP BAR IGHT TYP' CLR (SPAN L)7 _ PROVIDE 90• -- _ HOOK TYP 'N. (2)•4 ------ 11- 4 lelltik UPS ' I C - SUP7 .2 L.' CIA ' 2 e•