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Design Wind Pressure

Computes design wind pressure on a building surface using the AS/NZS 1170.2 Section 2.4 formula p = 0.5 * rho_air * V_des^2 * C_fig * C_dyn. Determines the basic dynamic pressure from wind speed, applies aerodynamic shape and dynamic response factors, and calculates the total wind force on a tributary area for structural design.

inputs

5 fields

context

6 archetypes

engine

with-tool

outputs

3 scored fields

contract fields

Parameter Map

5 inputs to 3 scored outputs

  • design_wind_speed_m_per_s

    float

    Design wind speed V_des,theta for the chosen cardinal direction

    20 to 80m/s

  • cfig

    float

    Aerodynamic shape factor C_fig (positive = pressure, negative = suction)

    -2 to 2dimensionless

  • cdyn

    floatfrom archetypehidden in hard

    Dynamic response factor C_dyn (1.0 for most low-rise structures)

    0.8 to 1.2dimensionless

  • air_density_kg_per_m3

    floatfrom archetypehidden in hard

    Air density rho_air (standard value 1.2 kg/m3)

    1 to 1.4kg/m3

  • tributary_area_m2

    float

    Tributary area of the surface being loaded

    1 to 200m2
dynamic_pressure_kpatol 0.03

Basic dynamic wind pressure q = 0.5 * rho * V^2 (kPa)

design_pressure_kpatol 0.03

Design wind pressure p = q * C_fig * C_dyn (kPa)

total_force_kntol 0.03

Total wind force on the tributary area F = p * A (kN)

visibility contract

Difficulty Ladder

all_giveneasy

All parameters given, low-rise buildings with C_dyn = 1.0 and standard air density

all fields visible
all_givenmedium

All parameters given, wider range of building types including mid-rise and industrial

all fields visible
partialhard

C_dyn and air density hidden; agent must adopt standard values from engineering knowledge

cdynair_density_kg_per_m3

scenario bands

Archetype Atlas

low_rise_windward_wall

2 contexts

Windward wall of a low-rise building in suburban terrain

design_wind_speed_m_per_s30 to 46
cfig0.5 to 0.8
cdyn1
air_density_kg_per_m31.2

suburban-residential-house / small-commercial-warehouse

low_rise_roof_suction

2 contexts

Roof surface under suction on a low-rise building in open terrain

design_wind_speed_m_per_s35 to 55
cfig-1.3 to -0.5
cdyn1
air_density_kg_per_m31.2

rural-farm-shed-roof / coastal-industrial-roof

mid_rise_facade

2 contexts

Facade panel on a mid-rise office building in city fringe terrain

design_wind_speed_m_per_s35 to 55
cfig0.6 to 1.2
cdyn1 to 1.05
air_density_kg_per_m31.2

city-fringe-office-block / university-campus-building

high_rise_cladding

2 contexts

Cladding panel on a tall building in urban terrain with dynamic amplification

design_wind_speed_m_per_s40 to 70
cfig-1.5 to 1.5
cdyn1 to 1.15
air_density_kg_per_m31.2

cbd-high-rise-tower / waterfront-residential-tower

industrial_large_opening

2 contexts

Large wall opening on an industrial building in open terrain

design_wind_speed_m_per_s40 to 65
cfig0.7 to 1.8
cdyn1
air_density_kg_per_m31.2

port-warehouse-roller-door / regional-aircraft-hangar

cyclonic_coastal

2 contexts

Coastal structure in a cyclonic wind region with high design wind speeds

design_wind_speed_m_per_s55 to 80
cfig-1.5 to 1.2
cdyn1 to 1.1
air_density_kg_per_m31.2

north-qld-cyclonic-house / darwin-commercial-building

rendered task

Generation Preview

city-fringe-office-block-mid-rise-facade-preview

difficulty
hard
visibility
partial
archetype
mid_rise_facade
site context
city-fringe-office-block
instruction excerptdesign-wind-pressure_calc.py

visible fields

  • design_wind_speed_m_per_s35 to 55 m/s
  • cfig0.6 to 1.2 dimensionless
  • tributary_area_m28 to 50 m2

withheld schema

cdynair_density_kg_per_m3dynamic_pressure_kpadesign_pressure_kpatotal_force_kn
Facade panel on a mid-rise office building in city fringe terrain. city-fringe-office-block. Required outputs: dynamic_pressure_kpa, design_pressure_kpa, total_force_kn