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WELCOME RAMP, INC. <br /> STRUCTURAL ANALYSIS <br /> Ramp System Design Criteria and Analysis <br /> 1) Reference Design Criteria: <br /> a) International Building Code, 2012&2015 Editions <br /> b) ANSI A 117.1, 2009 Edition <br /> 2) Site Specific Criteria: <br /> a) Building Occupancy Classifications: II <br /> b) Vertical Loading: 100 psf for Landings, 300 lbs. concentrated loads for steps <br /> c) Horizontal Loading: <br /> i) Wind Loads: 135 mph(ult), Exposure B, Kz=0.85, Kzt=1.0; Design Wind <br /> Pressure=30 psf(At less than 15 feet above grade, IBC <br /> 2012, 1609.6.2) <br /> ii) Seismic Loads: Sds= 1.00,S1=0.50, I=1.0, R=3.25, Oo=2, Cd=3.25,Cs=0.307 <br /> d) Soil Bearing: 1,500 psf, Unless verified by Geotechnical Report or <br /> Building Official <br /> 3) Material Specifications: <br /> a) Aluminum: <br /> i) Handrail ASTM 6063-15, 16 ksi, minimum yield strength <br /> ii) Structural ASTM 6061-15, 35 ksi, minimum yield strength <br /> b) Density 170 lbs. per cubic foot <br /> 4) Connectors: <br /> a) Bolts Grade 5 zinc-coated (Design),ASTM A-325 may be substituted. <br /> b) Screws #10x1.25" zinc plated Self-Tapping Screw(STS) <br /> c) Welding Per AWS D1.2 and size as shown on the drawings <br /> d) Sleeves Length of snug-fitting sleeves designed resist moment and <br /> shear of sleeved connection. <br /> 5) Design Basis: <br /> a) Each side of the assembly is a framed made rigid by either welding or assembling parts together <br /> in sleeves to resist movement. Base connections are a pinned condition. <br /> b) Each frame is connected together with landing or ramp frames and planking to distribute dead <br /> and live loads to the frames. Railing is added to the frame assembly. <br /> c) Landing Platforms are attached to buildings with Lag-bolts or SDS Screws. <br /> d) Basic Dead Load is 5 psf for frame, ramp& landing surfaces. 2 psf is added for railing. <br /> WELCOME RAMP CALCS-IBC 2012 &2015 Page 2 <br />