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19 <br />WELCOME RAMP, INC. <br />STRUCTURAL ANALYSIS <br />Ramp System Design Criteria and Analysis <br />1) Reference Design Criteria: <br />a) <br />International Building Code, 2012 & 2015 Editions <br />b) <br />ANSI A 117.1, 2009 Edition <br />2) Site Specific Criteria: <br />a) <br />Building Occupancy Classifications: <br />II <br />b) <br />Vertical Loading: <br />100 psf for Landings, 300 lbs. concentrated loads for steps <br />c) <br />Horizontal Loading: <br />i) Wind Loads: <br />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: <br />Sds = 1:00, S1=0.50, 1=1.0, R=3.25, Oo=2, Cd=3.25, Cs=0.307 <br />d) <br />Soil Bearing: <br />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 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 />