8/9/2019 Glass Laminate Thicness - No Reduc for Cantilever Glass

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EFFECTIVE GLASS THICKNESS AS PER ASTM E1300-09a APPENDIX X11

I. GLASS PARAMETERS

Interlayer thickness, hv 1.52 mm

Type of glass interlayer Sentry glass

Load duration 3 second

Temperature 50 °C

Interlayer shear modulus, G 26.4 N/mm2

Glass ply 1 thickness, h1 15 mm

Glass ply 2 thickness, h2 15 mm

Glass Young’s modulus, E 70000 N/mm2

Length scale (shortest bending direction), a 1950 mm

II. CHECK FOR SHEAR TRANSFER COEFFICIENT

hs = 0.5(h1 + h2) + hv 16.52 mm (ASTM E1300-09a eq. X11.5)

(ASTM E1300-09a eq. X11.3)

(ASTM E1300-09a eq. X11.4)

Is = h1hs;22 + h2hs;1

22046.83 (ASTM E1300-09a eq. X11.2)

Shear transfer coefficient, Γ0.93 (ASTM E1300-09a eq. X11.1)

III. CHECK FOR EFFECTIVE THICNESS OF GLASS

Effective thickness for deflection

Laminate effective thickness, hef; w

hef; w = 30.92 mm (ASTM E1300-09a eq. X11.6)

Effective thickness for bending

Laminate effective thickness, h1;ef; σ

31.21 mm (ASTM E1300-09a eq. X11.7)

31.21 mm (ASTM E1300-09a eq. X11.8)

IV. CHECK FOR DEFLECTION AND STRESS OF GLASS

Wind load pressure, WL 3.2 KPa

Max. deflection, 33.53 mm

Maximum stress, 37.46 N/mm2

h1;ef; σ =

h2;ef; σ =

hs;1 =

hs;2 =

8.26

8.26

Γ =

AS PER RECOMMENDATION FOR

DESIGN PURPOSE WIND LOAD CASE

(ASTM E1300-09a sec. X11.5)