AS 4055:2021 pdf free.Wind loads for housing.
1.3 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. NOTE Documents referenced for informative purposes are listed in the Bibliography. AS/NZS 1170.2, Structural design actions, Part 2: Wind actions 1.4 Terms and definitions For the purposes of this document, the following terms and definitions apply. 1.4.1 averaged ground level natural ground level excluding earthworks where earthworks are minor, or averaged ground level through modified land where the earthworks are major Note 1 to entry: Where minor earthworks have changed the level of the land over less than 50 m2, see lower cross-section in Figure 1.2[a]. Note 2 to entry: Where major earthworks have changed the level of the land over more than 50 m2, see upper right cross-section in Figure 1.2a). 1.4.2 bottom of hill, ridge or escarpment area at the base of the hill, ridge or escarpment, where the average slope is less than 1 in 20 1.4.3 height distance from ground level to the underside of eaves or to the highest point of the roof neglecting chimneys; or the height of each storey at external walls.2.2 Relationship to wind region and site conditions The selection of site wind classification for a house depends on the conditions at the site of the house. The classification shall be determined from Table 2.2 using the following site conditions determined as stated: a Geographic wind region of the site as defined in Figure 2.2 (Region A, B, C or Region D, as given in AS/NZS 1170.2). (b) The terrain category that surrounds or is likely to surround the site within the next five years, as defined in Clause 2.3, e.g. TC1, TC2, TC2.5 or TC3. [C) The topographic class of the site, as defined in Clause 2.4, e.g. T0, T1, T2, T3, T4 orT5. (d) The shielding class of the house, as defined in Clause 2.5, e.g. FS, PS or NS. For cyclonic wind Regions C and D, the site wind classification is a function of the distance (km) from the coast or wind region boundary closest to the coast. For wind Region C in Western Australia, inland from wind Region D, the distance given in Table 2.4 is the distance (km) to the boundary between wind Region C and wind Region D, elsewhere in wind Region C, it is the distance to the smoothed coast line.AS 4055 pdf download.