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built templatewind-load-derivationwith-tool

Design Wind Speed

Calculates the design site wind speed using the AS/NZS 1170.2 Section 2.2 equation V_sit,beta = V_R * M_d * M_z,cat * M_s * M_t. The terrain/height multiplier M_z,cat is looked up from Table 4.1(A) with linear interpolation for intermediate heights across five terrain categories. Applicable to buildings and structures in Australian and New Zealand wind regions.

inputs

6 fields

context

4 archetypes

engine

with-tool

outputs

2 scored fields

contract fields

Parameter Map

6 inputs to 2 scored outputs

  • regional_wind_speed_m_per_s

    float

    Regional 3-second gust wind speed V_R

    25 to 70m/s

  • terrain_category

    enumfrom archetypehidden in hard

    Terrain category per AS/NZS 1170.2 Section 4.2

    122.534

  • building_height_m

    float

    Building height above ground z

    2 to 200m

  • topographic_multiplier

    float

    Topographic multiplier M_t

    1 to 1.5-

  • shielding_multiplier

    floatfrom archetypehidden in hard

    Shielding multiplier M_s

    0.7 to 1-

  • wind_direction_multiplier

    floatoptional

    Wind direction multiplier M_d

    0.8 to 1-
mz_cattol 0.03

Terrain/height multiplier M_z,cat from Table 4.1(A)

site_wind_speed_m_per_stol 0.03

Site wind speed V_sit,beta (m/s)

visibility contract

Difficulty Ladder

all_giveneasy

All parameters given, flat terrain with no shielding or topographic effects

all fields visible
all_givenmedium

All parameters given, includes shielding and topographic effects

all fields visible
partialhard

Terrain category and shielding hidden — agent must infer from site description

terrain_categoryshielding_multiplier

scenario bands

Archetype Atlas

flat_unshielded

4 contexts

Flat open terrain site with no surrounding obstructions (terrain category 1 or 2) and no topographic amplification

topographic_multiplier1
shielding_multiplier1
terrain_category1, 2

darling-downs-qld / riverina-nsw / gold-coast-beachfront / darwin-coastal

lightly_shielded

4 contexts

Site in suburban area with partial shielding from nearby low-rise buildings or vegetation (terrain category 2.5 or 3)

topographic_multiplier1 to 1.05
shielding_multiplier0.85 to 1
terrain_category2.5, 3

sydney-western-suburbs / melbourne-outer-east / brisbane-northside / wetherill-park-nsw

heavily_shielded

3 contexts

Site in dense urban centre heavily shielded by closely spaced multi-storey buildings (terrain category 4)

topographic_multiplier1
shielding_multiplier0.7 to 0.85
terrain_category4

sydney-cbd / melbourne-cbd / brisbane-cbd

hilltop_exposed

3 contexts

Building on or near a hilltop or escarpment with topographic wind acceleration in open terrain (terrain category 1 or 2)

topographic_multiplier1.1 to 1.5
shielding_multiplier1
terrain_category1, 2

blue-mountains-nsw / mt-coot-tha-qld / adelaide-hills-sa

rendered task

Generation Preview

darling-downs-qld-flat-unshielded-preview

difficulty
hard
visibility
partial
archetype
flat_unshielded
site context
darling-downs-qld
instruction excerptdesign-wind-speed_calc.py

visible fields

  • regional_wind_speed_m_per_s25 to 70 m/s
  • building_height_m2 to 200 m
  • topographic_multiplier1 to 1 -
  • wind_direction_multiplier1 -

withheld schema

shielding_multiplierterrain_categorymz_catsite_wind_speed_m_per_s
Flat open terrain site with no surrounding obstructions (terrain category 1 or 2) and no topographic amplification. darling-downs-qld. Required outputs: mz_cat, site_wind_speed_m_per_s