Building codes may vary by locality. The IBC (International Building Code) is becoming the standard, however, other applicable building codes may be BOCA, SBC, ANSI (now ASCE-7) or a local (city or state) building code. All design information can be easily obtained except local building code information.
WIND LOAD is usually given in MPH (miles per hour).
SEISMIC DESIGN CATEGORY is to be designated. If unknown, design will default to ASCE-7.
SNOW LOAD is given in PSF (pounds per square foot). Local conditions may govern in mountain regions, the west coast through the Rocky Mountain states and the East coast, North of Massachusetts.
LIVE LOAD is usually given in PSF (pounds per square foot). Typical design values for platforms are:
- ACCESS PLATFORM (1-3 people - limited use) — 50 PSF
- OPERATING PLATFORM (1-3 people - constant) — 75 PSF
- WORK PLATFORM (men with tools, portable equipment) — 100 PSF
DEFLECTION CRITERIA is typically:
- Specified as 1/4" for the grating with 100 PSF LIVE LOAD (NOT necessarily the PLATFORM DESIGN LIVE LOAD)
- Specified as L/180 to L/360 for structural members (span in inches divided by 180
to 360, respectively)
CONCENTRATED LOADS are ADDITIONAL TO LIVE LOAD and may be permanent equipment, barrels or drums of chemicals, pallets of materials, boxes, etc. Obtain these LOADS in LBS. and possibly an area over which they act (i.e. pallets 4'x4' weighing 4,000 lbs. ea.)