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$ 3 <br /> WELCOME RAMP, INC. <br /> STRUCTURAL ANALYSIS <br /> • Ramp System Design Criteria and Analysis <br /> 1) Reference Design Criteria: <br /> a) International Building Code, 2018 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(ultimate), Exposure B, Kz=0.85, Kzt=1.0; Design <br /> Wind Pressure= 30 psf(At less than 15 feet above grade, <br /> IBC 2012, 1609.6.2)w/5' effective width =30 lbs/leg <br /> ii) Seismic Loads: Sds= 1.50, S1=0.50, I=1.0, R=3.25, 00=2, Cd=3.25, Cs=0.462, <br /> w/62.5#DL/leg*0.462*2=58#/leg <br /> iii) Pedestrian Traffic Load: 5'effective*100psf*1/12*1.5 =63#/leg <br /> d) Soil Bearing: 1,500 psf, unless verified by Geotechnical Report or Building <br /> 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 /> e) A 300 lb. lateral load is used in the design to simulate seismic, wind and pedestrian lateral <br /> loading for each frame (2 frames per unit, 600# per assembly).This results in an effective Design <br /> WELCOME RAMP CALCS-IBC 2018 Page 2 <br />