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� <br />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 Ibs. 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, �20=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 Ibs. 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 sleeving parts 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 Ib. 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 />