AS NZS 1170.2-2021

Description

AS 1170 Part 2 – 2021 Edition – Structural design actions, Part 2: Wind actions

AS 1170.2 sets out procedures for determining wind speeds and resulting wind actions to be used in the structural design of structures subjected to wind actions other than those caused by tornadoes.

AS 1170 Part 2 covers structures within the following criteria:

(a) Buildings and towers less than or equal to 200 m high.
(b) Structures with unsupported roof spans of less than 100 m.
(c) Offshore structures within 30 km from the nearest coastline.
(d) Other structures apart from: offshore structures more than 30 km from the nearest coastline, bridges, windfarm structures and power transmission and distribution structures, including supporting towers and poles.

NOTE 1 AS 1170 Part 2 is a stand-alone document for structures within the above criteria. It may be used, in general, for all structures but other information may be necessary.

NOTE 2 If a tall building has a natural frequency less than 1 Hz, Section 6 requires dynamic analysis to be carried out. For other structures, such as lighting poles, dynamic analysis may be required even if the first-mode frequency exceeds 1 Hz (see limits in Clause 6.1).

NOTE 3 For structures excluded by (a) and (b), specialist techniques, including wind-tunnel testing, are required. Further advice, which may include wind-tunnel testing, also should be sought for roofs with unusual geometries or support systems, or the roofs of podiums at the base of tall buildings.

NOTE 4 For structures excluded by (d), wind loads are specified by other Australian or New Zealand Standards (bridges and power transmission and distribution structures), or by international standards (structures more than 30 km offshore, and windfarm structures). These may draw on this Standard for some aspects of wind load determination.

NOTE 5 Structures on any island territory of Australia and New Zealand, and offshore structures within 30 km of the shoreline of any of those territories, are covered by this Standard.

NOTE 6 In this document, the words “this Standard” indicates AS/NZS 1170.2, which is Part 2 of the AS/NZS 1170 series (see Preface).

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