Window & Curtain-Wall Wind-Load Calculator

Per China's Load Code GB 50009-2012 & Glass Curtain Wall Spec JGJ 102 · wind-load standard value + mullion / transom strength and deflection check

Per ASCE 7-22 · Components & Cladding (§26 / §30)

① Wind-load parameters

Standard / region

Basic wind speed V (3-sec gust · ultimate)

Wind speed (m/s)

Exposure category

Height above ground z (m)

Net pressure coeff |GCp − GCpi|

Enclosed GCpi = ±0.18; refine per ASCE 7 Fig 30.3-1 & effective wind area

V is ultimate; strength uses 1.0W, deflection 0.6W (service)

Exposure coeff Kz1.261

Velocity pressure qz1.710

Service pressure1.333

Design pressure2.222

② Frame member (simply-supported beam)

Window profile series (nominal depth)

Frame material

Young's modulus E (MPa)

Design bending strength f (MPa)

Tributary width B (member spacing, mm)

Design span L (mm)

Section modulus W (cm³)

Moment of inertia I (cm⁴)

Get section properties from the Eng. Calc tool or the profile datasheet

Deflection limit

Wind-pressure check result✓ Wind-pressure requirement satisfied

Strength σ ≤ f✓ OK

σ = 27.8 MPaf = 80 MPa

Utilisation 35%

Deflection δ ≤ [δ]✓ OK

δ = 15.3 mm[δ] = 16.7 mm

Utilisation 92%

Breakdown

Service pressure: 1.333 kN/m²
Design pressure: 2.222 kN/m²
Line load (service) qk: 1.333 kN/m
Design moment Md: 2.50 kN·m
Allowable deflection [δ]: 16.7 mm

Basis & formulas

ASCE 7-22 velocity pressure (SI): qz = 0.613 · Kz · Kzt · Kd · Ke · V²

C&C design pressure p = qz·(GCp − GCpi); Kz = 2.01·(z/zg)^(2/α), Kd = 0.85, GCpi = ±0.18.

Member strength (simply-supported beam, UDL): σ = Md / W , Md = γ · qk · L²/8 , qk = p·B

Member deflection (service wind): δ = 5·qk·L⁴ / (384·E·I) ≤ [δ] = L/n

Deflection-limit reference

Limit / basis
L/150 (JGJ 214 window member)
L/180 (JGJ 102 alu. mullion)
L/200 (stricter)
L/250 (JGJ 102 steel)
L/300 (strict)

Typical frame material parameters

Material	E (MPa)	f (MPa)
Pultruded FRP (E40 high-modulus · bridge-grade)*	40,000	120
Pultruded FRP (EN 13706 E23)*	23,000	80
Pultruded FRP (EN 13706 E17)*	17,000	60
Aluminium 6063-T5	70,000	90
Aluminium 6061-T6	70,000	150
Steel Q235	206,000	215
Steel Q355	206,000	305

* Pultruded FRP E and f vary widely by grade and lay-up; presets are typical values only — always confirm against the manufacturer's measured datasheet.

Notes

This tool checks wind-pressure resistance and deflection of window / curtain-wall cladding members using a simply-supported UDL beam model — for preliminary sizing of mullions, transoms and meeting stiles.
The net pressure coefficient is the governing (usually corner/edge suction) magnitude including internal+external pressure; zone and effective-wind-area reduction must be refined per the selected code.
Pultruded FRP E and f vary widely by grade and lay-up; presets are typical values only — always confirm against the manufacturer's measured datasheet.
Deflection uses the service/characteristic wind; strength uses the design/ultimate level. Glass panels, connections, embeds, seismic and thermal actions must be checked separately.
US: ASCE 7-22 / IBC; V is the ultimate (strength-level) 3-sec gust — take it from the ASCE 7 wind maps for the Risk Category.

Results are for preliminary estimation and scheme comparison only and do not replace a formal structural calculation. Final design must be reviewed and signed off by a qualified structural engineer per the full current codes.