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ADVANCED DESIGN OF GLASS STRUCTURES
Design of glass fin
Viorel Ungureanu
European Erasmus Mundus Master Course Sustainable Constructions
under Natural Hazards and Catastrophic Events 520121-1-2011-1-CZ-ERA MUNDUS-EMMC
2 2
Objectives of the lecture • Design of glass fin Assess glass fin of the facade – see figure. It is simply supported and suspended from its top support. It is bolted to the inside face of a glass facade and silicone seals provide continuous attachment between the edge of the fin and facade. It is assumed that for short-term gust loads the silicone seals are capable of providing lateral restraint to the edge of fin. It is also assumed that the low modulus of silicone does not permit any T-beam action between the fin and the facade.
L = c1 6000 mm b = 500 mm B = c2 1500 mm t = 16 mm wind load w = 1,0 kN/m2 unit weight 2500 kg/m3
L
b
B
tension strength of glass short-term load long-term load float glass (t = 10mm) 28,0 MPa 7,0 MPa toughened glass 59,0 MPa 35,0 MPa
Objectives
Short term load action
Long term load action
Lateral torsional buckling
Deformation
3
Short term load action 1. Moment (design value) – simple check
• Wind load w = 1,0 kN/m2
• Load width B = c2 1500 mm
2. Section modulus
3. Short term load action
168
1 32 tELwM kFEd
Objectives
Short term load action
Long term load action
Lateral torsional buckling
Deformation
5,1F
mkNBwwk
2
61 btWy y b
t
dy
Ed fWM
- decision about the type of glass
4
Long term load action 4. Axial load in the fin - self weight for = 25kN/m3
5. Long term load action from self weight
LBtLbtN FEd
Objectives
Short term load action
Long term load action
Lateral torsional buckling
Deformation
dfin
Ed fAN
- depends on the type of glass
glass fin glass facade
5
Lateral torsional buckling 6. Lateral torsional buckling of the glass fin according to the Australian
standard
• La = length of the beam
• d = b …. height of the glass fin
• Iz moment of inertia
• G = 28 700MPa – shear modulus of elasticity
• J = It …torsional moment of inertia
• yh = 250mm …. location above the neutral axis of the loading point, positive or negative values for suction and compression
• y0 = 250mm …. distance of the restraints from neutral axis
Objectives
Short term load action
Long term load action
Lateral torsional buckling
Deformation
h
za
CR yy
GJydEILM
0
20
22
24
3
121 tbI z 3
31 tbI t
6
Deformation 7. Check - simple approach
8. Vertical deformation
9. Vibration
Objectives
Short term load action
Long term load action
Lateral torsional buckling
Deformation
5003845
lim
4 LEILw
y
k
3
121 btI y
71,MM cr
Ed
Hzf 516
7
Thank you for your attention
7
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