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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 Edition <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: 115 mph, Exposure B, Kz=0.85,Kzt=1.0; Design Wind <br /> Pressure=20 psf(At less than 15 feet above grade) <br /> ii) Seismic Loads: Sds=1.00,S1=0.51,1=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-T5, 16 ksi, minimum yield strength <br /> ii) Structural ASTM 6061-T5,35 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 sleevingparts to resist <br /> 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) Basic Dead Load is 6 psf for frame, ramp&landing surfaces.2 psf is added for railing. <br /> d) A 300 lb. lateral load is used in the design to simulate seismic,wind and pedestrian lateral loading for <br /> each frame.This results in an effective Design Cs for a 30-foot ramp and 5x10 platform of 0.5 and a design <br /> wind load of 30 psf without consideration for stress duration.Seismic and wind loads do not govern lateral <br /> loading for standard configurations. For those configurations longer than 40',soil anchors shall be installed at <br /> the rate of(1)anchor for each length of landing 60' longer than 40'.See Typical Soil Anchor Detail. <br /> WELCOME RAMP CALCS-IBC 2012 Page 2 <br />