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SECTION 1605 LOAD COMBINATIONS
1605.5 Heliports and helistops.
Heliport and helistop landing areas shall be designed
for the following loads, combined in accordance with Section
1605:
1. Dead
load, D, plus the gross weight of the helicopter, Dh,
plus snow load, S.
2. Dead
load, D, plus two single concentrated
impact loads, L, approximately 8 feet (2438 mm) apart applied
anywhere on the landing area (representing the helicopters
two main landing gear, whether skid type or wheeled type),
having a magnitude of 0.75 times the gross weight of the
helicopter. Both loads acting together total one-and one
half times the gross weight of the helicopter.
3. Dead
load, D, plus a uniform live load,
L, of 100 psf (4.79 kN/m2).
Exception: Landing areas
designed for helicopters with gross weights not exceeding
3,000 pounds (13.34 kN) in accordance with Items 1 and 2 shall
be permitted to be designed using a 40 psf (1.92 kN/m2)
uniform live load in Item 3, provided the landing area is
identified with a 3,000 pound (13.34 kN) weight limitation.
This 40 psf (1.92 kN/m2) uniform live load shall
not be reduced. The landing area weight limitation shall be
indicated by the numeral 3 (kips) located in the
bottom right corner of the landing area as viewed from the
primary approach path. The landing area weight limitation
shall be a minimum of 5 feet (1524 mm) in height.
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