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Title: Section 1609  •  Size: 4582

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SECTION 1609 - SPECIAL DESIGN

1609.1 General. In addition to the design loads specified in this chapter, the design of all structures shall consider the special loads set forth in Table 16-B and in this section.

1609.2 Retaining Walls. Retaining walls shall be designed to resist the lateral pressure of the retained material in accordance with accepted engineering practice. Walls retaining drained earth may be designed for pressure equivalent to that exerted by a fluid weighing not less than 30 pounds per cubic foot (4.71 kN/) and having a depth equal to that of the retained earth. Any surcharge shall be in addition to the equivalent fluid pressure.

Retaining walls shall be designed to resist sliding by at least 1.5 times the lateral force and overturning by at least 1.5 times the overturning moment.

1609.3 Heliport and Helistop Landing Areas. In addition to other design requirements of this chapter, heliport and helistop landing or touchdown areas shall be designed for the maximum stress induced by the following:

1. Dead load plus actual weight of the helicopter.

2. Dead load plus a single concentrated impact load covering 1 square foot (0.092 903 ) of 0.75 times the fully loaded weight of the helicopter if it is equipped with hydraulic-type shock absorbers, or 1.5 times the fully loaded weight of the helicopter if it is equipped with a rigid or skid-type landing gear.

3. The dead load plus a uniform live load of 100 pounds per square foot (4.9 kN/). The required live load may be reduced in accordance with the formula in Section 1606.

1609.4 Hydrostatic Uplift. All foundations, slabs and other footings subject to water pressure shall be designed to resist a uniformly distributed uplift equal to the full hydrostatic pressure.

1609.5 Flood-resistant Construction. For flood-resistant construction requirements see Appendix Chapter 31, Division I.

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