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PROJECT ENGINEER
SAMPLE PROJECT IN LONDON
DOCUMENT NO. REVISION
CALC-702 0 TITLE Pages
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Table of Contents
1 References ............................................................................................................. 3
1.1 Document references .............................................................................................. 3
1.2 Structural analysis software .................................................................................... 3
1.3 Loads ...................................................................................................................... 4
1.4 Design Approach .................................................................................................... 5
1.5 Glass list.................................................................................................................. 6
2 Glass @ Acoustic Zone 1 ..................................................................................... 7
2.1 GL-01 (Vision) ......................................................................................................... 7
2.2 GL-02, GL-04 & GL-05 (Vision/Vent) .................................................................... 22
3 Glass @ Acoustic Zone 2 ................................................................................... 37
3.1 GL-11 & GL-12 (Vision/Vent) ................................................................................ 37
4 Glass @ Acoustic Zone 3 ................................................................................... 52
4.1 GL-21 & GL-22 (Vision/Vent) ................................................................................ 52
4.2 GL-63b & GL-83b (Vision: 3-side supported) ....................................................... 67
5 Annex ................................................................................................................... 82
5.1 PVB Interlayer – Shear modulus .......................................................................... 82
5.2 Acoustic PVB Interlayer – Shear modulus ............................................................ 83
5.3 IGU Edge seal – Technical data sheat ................................................................. 84
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1 References
1.1 Document references
1.1.1 Norms and standards
[1] IStructE. Structural use of glass in buildings. 2nd edition, February 2014.
[2] pr EN 16612:2013. Glass in building – Design of glass panes – Part 1: General basis of design.
[3] pr EN 13474-1:1999. Glass in building – Design of glass panes – Part 1: General basis of design.
[4] BS 6180:2011. Barriers in and about buildings – Code of practice.
[5] CWCT TU14, Technical update on Load combinations
1.1.2 Project specific documents
[6] D701-21-CPT-CALC-001, Loads and load combinations.
[7] D701-21-CPT-CALC-002, System framing profiles – Window types A & H.
[8] D701-21-CPT-CALC-003, System framing profiles – Window types E, L & Q.
[9] Performance Specification for the Installation of: Curtain Wall, Windows, Sliding Doors, Sloped Glazing, Louvres, Balustrades and Cladding Systems, Fifth Issue. 26 July 2013.
1.2 Structural analysis software
[10] Nemetschek. SCIA Engineer v.14.0. Structural Analysis & Design Software for Construction and Engineering.
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1.3 Loads
1.3.1 Dead load including selfweights (D)
Glass selfweight is generated by the software.
1.3.2 Wind load (W)
In accordance with load report [6]
Net pressure, wp = +1.5 kN/m2
Net suction, ws = -2.1 kN/m2
1.3.3 Imposed/live load (L)
In accordance with the load report [6] based on Wintech specification [9]:
i. Residential areas:
Line load, qIh,k = 0.74 kN/m - applied at a height of 1.1m above FFL
Point load, QIh,k = 0.5 kN - applied within a height of 1.1m above FFL
Infill load, wIh,k = 1.0 kN/m² - applied within the infill height of 1.1m above FFL
ii. Retail and general assembly areas:
Line load, qIh,k = 1.5 kN/m - applied at a height of 1.1m above FFL
Point load, QIh,k = 1.5 kN - applied within a height of 1.1m above FFL
Infill load, wIh,k = 1.5 kN/m² - applied within the infill height of 1.1m above FFL
1.3.4 Maintenance load
Manual maintainance on walls according to CWCT clause 2.3.3:
Point load, QIh,k = 0.5 kN - applied on square of 100mm sides
BMU cradle impact under normal conditions must be ensured by the BMU contractor by designing the cradle buffer system such that the equivalent static load applied to the glass in not more than 0.5 kN. Impact under accidental situations giving equivalent static load more than 0.5 kN is not covered by this structural report.
1.3.5 Climatic load (C)
Climatic loads as a result of temperature, atmospheric pressure and altitude difference is checked in accordance with prEN 13474-1.
i. Glass production (Ariño Duglass, Zaragoza)
Hproduction =+216.0 m - above sea level
ii. Site (London)
Highest altitude of glass installation,
Hsite =+140.0 m - above sea level
Internal actions of insulating glass units
Summer Temperature difference, ΔT [°C] + 27
Pressure difference, Δpmet [kN/m²] - 3.0
Altitude difference, ΔH [m] = +216 - 0 + 216
Winter Temperature difference, ΔT [°C] - 27
Pressure difference, Δpmet [kN/m²] + 6.0
Altitude difference, ΔH [m] = 0 - 140 - 140
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1.4 Design Approach
IStructE’s “Structural use of glass in buildings” 2nd edition and the draft European standard for determination of the load resistance of glass panes prEN 16612 are used as guidance for the following glass structural calculations.
Design criterion: σd ≤ fg,d
1.4.1 Glass design stress (σd)
FEM analysis of glass panes gives principal stresses to be factored by the partial factors below.
i. Partial factors
Variable action, γQ = 1.2 - for glass used as infills for façade / curtain wall
Variable action, γQ = 1.3 - for secondary structures including infills serving as barrier
Variable action, γQ = 1.5 - for primary structures
Climatic action, ψ0·γQ = 1.0 - accompanying variable load to leading wind or imposed load
1.4.2 Glass design strength (fg,d)
i. Annealed glass
Design bending strength, fg,d = kmod·ksp·fg;k/γM;A
Characteristic bending strength, fg;k - see table below
Load duration factor, kmod - see table below
Glass surface profile factor, ksp = 1.0 - float glass
Material partial factor, γM;A = 1.6 - annealed glass
ii. Prestressed surface glass
Design bending strength, fg,d = kmod·ksp·fg;k/γM;A + kv(fb;k – fg;k)/γM;v
Characteristic bending strength, fb;k - see table below
Strengthening factor, kv = 0.6 - used either for horizontal or vertical toughening
Material partial factor, γM;v = 1.2 - prestressed surface
Allowable stress for vertical glazing infill panel
Float Glass Types
Bending strength [fg;k, fb;k]
Design Strength [N/mm²]
Wind load* kmod = 0.74
(W) fg,d
Imposed load only kmod = 0.89
(L) fg,d
Annealed monolithic 45 20.8 25.0
Heat-strengthened 70 33.3 37.5
Thermally toughened 120 58.3 62.5
Enamelled heat-strengthened 45 20.8 25.0
Enamelled thermally toughened 75 35.8 40.0
Note: * Wind load only or load combination involving wind load.
Thermal stress calculation is not in the scope of this calculation.
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1.5 Glass list
Glass Schedule (Minimum structural requirements)
Projekt:Centre Point, London
17/04/2015
rev. C
Dic
ke
Th
ickn
es
sK
an
ten
be
Beschreibung
Description Dic
ke
Th
ickn
es
s
Beschreibung
Description Dic
ke
Th
ickn
es
s
Beschreibung
DescriptionMin. Size Max. Size Imposed load
[mm] [mm] [mm] [mm×mm] [mm×mm][Outside /
Inside]
0.5 kN
@0.44m: 0.74kN/m0.5kN; 1.0kN/m²
0.5 kN
0.5 kN
0.5 kN
0.5 kN
0.5 kN
0.5 kN
0.5 kN
-
0.5 kN
-
0.5 kN
@0.44m: 0.74kN/m0.5kN; 1.0kN/m²
0.5 kN
0.5 kN
0.5 kN
@0.44m: 0.74kN/m0.5kN; 1.0kN/m²
0.5 kN
0.5 kN
0.5 kN
0.5 kN
0.5 kN{[0.5 kN]}
0.5kN [0.5kN]{@H/2: 0.74kN/m0.5kN; 1.0kN/m²}
0.5 kN{[0.5 kN]}
0.5kN{@H/2: 0.74kN/m0.5kN; 1.0kN/m²}
0.5 kN
-
0.5 kN
-
0.5 kN
-
STRUCTURAL
1025×4301048×1320[1054×480]
{1048×1180}
1054×316 1054×580
1005×560 1058×560
708×592 708×592
1058×240 1058×592
708×120 1005×1234
1005×483 708×1234
708×120 1054 × 1232
1005×435 673×1232
2120×435 1048×1180
20GL - 87- 87a*
Spandrel - White Translucent Frit (frit pattern
b)(WT- E & E1)
26.76 10.76
arris
Low iron heat strengthened 55.2 laminate with
translucent negative dot (2.5mm) frit diagonal
pattern (6.5mm centres spacing) to #2.
Stepped on right edge
10Swisspacer U /
argon filled /
silicone seal
6.00Low iron toughened &
HST with 100% frit in
dark grey to #6
19GL - 67- 67a*
Spandrel - White Translucent Frit (frit pattern
b)(WT- E, E1 & G)
26.76
6.00Low iron toughened &
HST with 100% frit in
dark grey to #6
18 GL - 27
Spandrel - White Translucent Frit (frit pattern
b)(WT- C, C1, C2, D & X)
26.76 10.76
arris
Low iron heat strengthened 55.2 laminate with
translucent negative dot (2.5mm) frit diagonal
pattern (6.5mm centres spacing) to #2
10Swisspacer U /
argon filled /
silicone seal
14
Groun
18Swisspacer U /
argon filled /
silicone seal
15
GL - 63[- 63a*]{- 63b*}
Vision - White Translucent Frit (frit pattern b)
(WT- E, E1, G, L & L1)
37.52 [37.52]{41.52}
10.76 [10.76]{14.76}
Low-iron annealed
44.2 laminate with
acoustic interlayer
12 10.76
arri
13 GL - 22Vents
(WT- H, N, Q, R & Y)
GL - 21Vision
(WT- H, N & Y)37.52 8.76
Low-iron annealed
44.2 laminate with
acoustic interlayer
10.76
Grou
10 GL -12 8.76Low iron annealed
44.2 laminate with
acoustic interlayer
Vents (WT- H, P & Q)
42.28 15.52
Groun
Low iron heat strengthened 86.4 laminate with
acoustic interlayer stepped edge to all sides
with black edge frit #2
18Swisspacer U /
argon filled /
silicone seal
8.76
8 6.00
Low iron annealed
44.2 laminate with
acoustic interlayer
GL - 11Vision
(WT- H)42.28 15.52
arri
Low iron head strengthened 86.4 laminated with
acoustic interlayer9
Low iron toughened &
HST with 100% frit in
dark grey to #6
GL - 08
Spandrel with White Translucent Frit (frit pattern
c)(WT- A, B & F)
31.52 14.76
arri
5 GL - 05Vision - White translucent
frit (pattern c)(WT- A & B)
6 GL - 06 6.00Low iron toughened &
HST with 100% frit in
dark grey to #6
18Swisspacer U /
argon filled /
silicone seal
10.76
4 10.76Low iron anneled 55.2
laminate with acoustic
interlayer
GL - 04Vision - White translucent
frit (pattern c)(WT- A & B)
46.28 17.52
arri
Low iron heat strengthened 106.4 aminate with
acoustic interlayer; translucent linear vertical frit
pattern to #2
18Swisspacer U /
argon filled /
silicone seal
1005×900 1058×1310
2 GL - 02Vent Glass
(WT- A & H)46.28 17.52
Grou
Low iron heat strengthened 106.4 laminate with
acoustic interlayer stepped edge to all sides
with black edge frit #2
10.76Low iron annealed
55.2 laminate with
acoustic interlayer
708×240 708×1290
10.76Low iron annealed
55.2 laminate with
acoustic interlayer
18Swisspacer U /
argon filled /
silicone seal
18 708×120 1048×11801
Ite
m N
o.
Glastyp
Glass
type
AnmerkungenComments
Ge
sam
tdic
ke
To
tal
Th
ickn
es
AußenscheibeOuter Pane
InnenscheibeInner Pane
SZRCavity
GL - 01Vision
(WT- A & H)46.28 17.52
arri
Swisspacer U /
argon filled /
silicone seal
Low iron heat strengthened 106.4 laminated
with acoustic interlayer
Low iron anneled 55.2
laminate with acoustic
interlayer
46.28 17.52
Ground
Low iron heat strengthened 106.4 laminate with
acoustic interlayer; translucent linear vertical frit
pattern to #2. Stepped edge all sides with 100%
black frit to #2.
14.76
arri
Low iron heat strengthened 86.2 laminate 10Swisspacer U /
argon filled /
silicone seal
31.52
37.52Low-iron annealed
44.2 laminate with
acoustic interlayer
8.76
GL - 23
Vision - White Translucent Frit (frit pattern b)
(WT- C, C1, C2, D, J, J1, J2, K, N & X)
37.52 10.76
arris
Low iron heat strengthened 55.2 laminate with
translucent negative dot (2.5mm) frit diagonal
pattern (6.5mm centres spacing) to #2
18Swisspacer U /
argon filled /
silicone seal
Low-iron annealed
44.2 laminate with
acoustic interlayer
8.76
Spandrel(WT- A, M, V & P)
8.76
Low iron heat strengthened 86.2 laminate;
translucent linear vertical frit pattern to #210
Swisspacer U /
argon filled /
silicone seal
Low iron heat strengthened 55.2 laminate.
Stepped edge to all sides with 100% black edge
frit #2
18Swisspacer V /
argon filled /
silicone seal
Low iron heat strengthened 55.2 laminate 18Swisspacer U /
argon filled /
silicone seal
18Swisspacer U /
argon filled /
silicone seal
Low iron heat strengthened 55.2 [55.2] {86.2}
laminate with translucent negative dot (2.5mm)
frit diagonal pattern (6.5mm centres spacing) to
#2. Stepped on left edge
1025×4301048×1320[1054×480]
{1048×1180}
16
GL - 83[- 83a*]{- 83b*}
Vision - White Translucent Frit (frit pattern b)
(WT- E, E1, L & L1 )
37.52 [37.52]{41.52}
10.76 (14.76)
Groun
Low iron heat strengthened 55.2 [55.2] {86.2}
laminate with translucent negative dot (2.5mm)
frit diagonal pattern (6.5mm centres spacing) to
#2. Stepped on right edge
18Swisspacer U /
argon filled /
silicone seal
8.76Low-iron annealed
44.2 laminate with
acoustic interlayer
10.76
arris
Low iron heat strengthened 55.2 laminate with
translucent negative dot (2.5mm) frit diagonal
pattern (6.5mm centres spacing) to #2.
Stepped on left edge
10Swisspacer U /
argon filled /
silicone seal
6.00Low iron toughened &
HST with 100% frit in
dark grey to #6
1025×235 1025×580
1025×235 1025×580
Note: * 3-side supported glass under wind suction.
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2 Glass @ Acoustic Zone 1
2.1 GL-01 (Vision)
2.1.1 Effective glass thickness, load sharing and climatic loads
prEN 16612:2013 Glass in building - Design of glass panes Clause
Double glazed unit a = 1.048 m Shorter side of DGU
b = 1.180 m Longer side of DGU
d1o + d1i = 10 + 6 mm
t1 = 1.52 mm G 1 = 0.4 N/mm²
18 mm Air space
d2o + d2i = 5 + 5 mm
t2 = 0.76 mm G 2 = 0.4 N/mm²
Effective glass thickness: Is1 = 663.55 Stiffness [ASTM E:1300]
Γ1 = 0.0792 Shear transfer coefficient
d1ef,w = 13.80 mm Effective thickness for deflection (12)
d1ef,σ = 15.53 mm Effective thickness for stress (13)
Is2 = 82.944 Stiffness
Γ2 = 0.2560 Shear transfer coefficient
d2ef,w = 7.96 mm Effective thickness for deflection (12)
d2ef,σ = 8.83 mm Effective thickness for stress (13)
Climatic effects a/b = 0.89 Aspect ratio
k5 = 0.024 Coefficient for volume per load Table B.3
δ1 = d1ef,w3/(d1ef,w
3+d2ef,w3) = 0.839 Factor of load shared by outerleaf glass (C.1)
a* = 28.9(dSZR∙δ1∙d2ef,w3/k5)
1/4 = 684 mm Characteristic length (C.4)
ϕ = 1/[1+(a/a*)4] = 0.1535 Insulating unit factor (C.3)
Summer: ∆Ts = 27 °K Temperature difference, c 1 = 0.340 kPa/°K
∆pmet,s = -3 kN/m² Difference of meteorological and atmospheric pressure
∆Hs = 216 m Local height difference, c 2 = 0.012 kPa/m
p0,s = c1∙∆Ts - ∆pmet,s + c2∙∆Hs = 14.8 kN/m² Isochore pressure at summer
ps = ϕ∙p0,s = 2.27 kN/m² Effective internal positive pressure
Winter: ∆Tw = -27 °K Temperature difference, c 1 = 0.340 kPa/°K
∆pmet,s = 6 kN/m² Difference of meteorological and atmospheric pressure
∆Hs = -140 m Local height difference, c 2 = 0.012 kPa/m
p0,w = c1∙∆Tw - ∆pmet,w + c2∙∆Hw = -16.9 kN/m² Isochore pressure at winter
pw = ϕ∙p0,w = -2.59 kN/m² Effective internal negative pressure
Acoustic interlayer
dSZR ≤
Outer laminated glass
Inner laminated glass
Acoustic interlayer
2.1.2 Glass check
Refer to FEM analysis results in section 2.1.3.
i. Outer laminated heat strengthened pane - Stress check
Wind load, σd = 8.08 N/mm² < (W) fg,d = 33.3 N/mm²
Imposed load only, σd = 9.53 N/mm² < (L) fg,d = 37.5 N/mm²
ii. Inner laminated annealed pane - Stress check
Wind load, σd = 15.60 N/mm² < (W) fg,d = 20.8 N/mm²
Imposed load only, σd = 24.86 N/mm² < (L) fg,d = 25.0 N/mm²
iii. Deflection check
Max. δ = 7.29 mm < 1048/65 = 16.12 mm
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2.1.3 FEM Analysis
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2.2 GL-02, GL-04 & GL-05 (Vision/Vent)
2.2.1 Effective glass thickness, load sharing and climatic loads
prEN 16612:2013 Glass in building - Design of glass panes Clause
Double glazed unit a = 1.058 m Shorter side of DGU
b = 1.310 m Longer side of DGU
d1o + d1i = 10 + 6 mm
t1 = 1.52 mm G 1 = 0.4 N/mm²
18 mm Air space
d2o + d2i = 5 + 5 mm
t2 = 0.76 mm G 2 = 0.4 N/mm²
Effective glass thickness: Is1 = 663.55 Stiffness [ASTM E:1300]
Γ1 = 0.0806 Shear transfer coefficient
d1ef,w = 13.82 mm Effective thickness for deflection (12)
d1ef,σ = 15.55 mm Effective thickness for stress (13)
Is2 = 82.944 Stiffness
Γ2 = 0.2596 Shear transfer coefficient
d2ef,w = 7.98 mm Effective thickness for deflection (12)
d2ef,σ = 8.85 mm Effective thickness for stress (13)
Climatic effects a/b = 0.81 Aspect ratio
k5 = 0.028 Coefficient for volume per load Table B.3
δ1 = d1ef,w3/(d1ef,w
3+d2ef,w3) = 0.839 Factor of load shared by outerleaf glass (C.1)
a* = 28.9(dSZR∙δ1∙d2ef,w3/k5)
1/4 = 659 mm Characteristic length (C.4)
ϕ = 1/[1+(a/a*)4] = 0.1307 Insulating unit factor (C.3)
Summer: ∆Ts = 27 °K Temperature difference, c 1 = 0.340 kPa/°K
∆pmet,s = -3 kN/m² Difference of meteorological and atmospheric pressure
∆Hs = 216 m Local height difference, c 2 = 0.012 kPa/m
p0,s = c1∙∆Ts - ∆pmet,s + c2∙∆Hs = 14.8 kN/m² Isochore pressure at summer
ps = ϕ∙p0,s = 1.93 kN/m² Effective internal positive pressure
Winter: ∆Tw = -27 °K Temperature difference, c 1 = 0.340 kPa/°K
∆pmet,s = 6 kN/m² Difference of meteorological and atmospheric pressure
∆Hs = -140 m Local height difference, c 2 = 0.012 kPa/m
p0,w = c1∙∆Tw - ∆pmet,w + c2∙∆Hw = -16.9 kN/m² Isochore pressure at winter
pw = ϕ∙p0,w = -2.20 kN/m² Effective internal negative pressure
Acoustic interlayer
dSZR ≤
Outer laminated glass
Inner laminated glass
Acoustic interlayer
2.2.2 Glass check
Refer to FEM analysis results in section 2.2.3.
i. Outer laminated heat strengthened pane with edge frit - Stress check
Wind load, σd = 7.87 N/mm² < (W) fg,d = 20.8 N/mm²
Imposed load only, σd = 8.42 N/mm² < (L) fg,d = 25.0 N/mm²
ii. Inner laminated annealed pane - Stress check
Wind load, σd = 15.03 N/mm² < (W) fg,d = 20.8 N/mm²
Imposed load only, σd = 22.95 N/mm² < (L) fg,d = 25.0 N/mm²
iii. Deflection check
Max. δ = 6.95 mm < 1058/65 = 16.28 mm
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2.2.3 FEM Analysis
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3 Glass @ Acoustic Zone 2
3.1 GL-11 & GL-12 (Vision/Vent)
3.1.1 Effective glass thickness, load sharing and climatic loads prEN 16612:2013 Glass in building - Design of glass panes Clause
Double glazed unit a = 1.005 m Shorter side of DGU
b = 1.234 m Longer side of DGU
d1o + d1i = 8 + 6 mm
t1 = 1.52 mm G 1 = 0.4 N/mm²
18 mm Air space
d2o + d2i = 4 + 4 mm
t2 = 0.76 mm G 2 = 0.4 N/mm²
Effective glass thickness: Is1 = 362.52 Stiffness [ASTM E:1300]
Γ1 = 0.0900 Shear transfer coefficient
d1ef ,w = 11.23 mm Effective thickness for deflection (12)
d1ef ,σ = 12.64 mm Effective thickness for stress (13)
Is2 = 45.315 Stiffness
Γ2 = 0.2834 Shear transfer coefficient
d2ef ,w = 6.56 mm Effective thickness for deflection (12)
d2ef ,σ = 7.26 mm Effective thickness for stress (13)
Climatic effects a/b = 0.81 Aspect ratio
k5 = 0.028 Coefficient for volume per load Table B.3
δ1 = d1ef ,w3/(d1ef ,w
3+d2ef ,w3) = 0.834 Factor of load shared by outerleaf glass (C.1)
a* = 28.9(dSZR∙δ1∙d2ef ,w3/k5)
1/4 = 570 mm Characteristic length (C.4)
ϕ = 1/[1+(a/a*)4] = 0.0935 Insulating unit factor (C.3)
Summer: ∆Ts = 27 °K Temperature difference, c 1 = 0.340 kPa/°K
∆pmet,s = -3 kN/m² Difference of meteorological and atmospheric pressure
∆Hs = 216 m Local height difference, c 2 = 0.012 kPa/m
p0,s = c1∙∆Ts - ∆pmet,s + c2∙∆Hs = 14.8 kN/m² Isochore pressure at summer
ps = ϕ∙p0,s = 1.38 kN/m² Effective internal positive pressure
Winter: ∆Tw = -27 °K Temperature difference, c 1 = 0.340 kPa/°K
∆pmet,s = 6 kN/m² Difference of meteorological and atmospheric pressure
∆Hs = -140 m Local height difference, c 2 = 0.012 kPa/m
p0,w = c1∙∆Tw - ∆pmet,w + c2∙∆Hw = -16.9 kN/m² Isochore pressure at winter
pw = ϕ∙p0,w = -1.58 kN/m² Effective internal negative pressure
Acoustic interlayer
dSZR ≤
Outer laminated glass
Inner laminated glass
Acoustic interlayer
3.1.2 Glass check
Refer to FEM analysis results in section 3.1.3.
i. Outer laminated heat strengthened pane with edge frit - Stress check
Wind load, σd = 9.01 N/mm² < (W) fg,,d = 20.8 N/mm²
Imposed load only, σd = 9.85 N/mm² < (L) fg,d = 25.0 N/mm²
ii. Inner laminated annealed pane - Stress check
Wind load, σd = 14.46 N/mm² < (W) fg,d = 20.8 N/mm²
Imposed load only, σd = 23.95 N/mm² < (L) fg,d = 25.0 N/mm²
iii. Deflection check
Max. δ = 7.03 mm < 1005/65 = 15.46 mm
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3.1.3 FEM Analysis
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4 Glass @ Acoustic Zone 3
4.1 GL-21 & GL-22 (Vision/Vent)
4.1.1 Effective glass thickness, load sharing and climatic loads
prEN 16612:2013 Glass in building - Design of glass panes Clause
Double glazed unit a = 1.005 m Shorter side of DGU
b = 1.232 m Longer side of DGU
d1o + d1i = 5 + 5 mm
t1 = 0.76 mm G 1 = 0.5 N/mm²
18 mm Air space
d2o + d2i = 4 + 4 mm
t2 = 0.76 mm G 2 = 0.4 N/mm²
Effective glass thickness: Is1 = 82.944 Stiffness [ASTM E:1300]
Γ1 = 0.2834 Shear transfer coefficient
d1ef ,w = 8.10 mm Effective thickness for deflection (12)
d1ef ,σ = 8.96 mm Effective thickness for stress (13)
Is2 = 45.315 Stiffness
Γ2 = 0.2834 Shear transfer coefficient
d2ef ,w = 6.56 mm Effective thickness for deflection (12)
d2ef ,σ = 7.26 mm Effective thickness for stress (13)
Climatic effects a/b = 0.82 Aspect ratio
k5 = 0.028 Coefficient for volume per load Table B.3
δ1 = d1ef ,w3/(d1ef ,w
3+d2ef ,w3) = 0.654 Factor of load shared by outerleaf glass (C.1)
a* = 28.9(dSZR∙δ1∙d2ef ,w3/k5)
1/4 = 536 mm Characteristic length (C.4)
ϕ = 1/[1+(a/a*)4] = 0.0750 Insulating unit factor (C.3)
Summer: ∆Ts = 27 °K Temperature difference, c 1 = 0.340 kPa/°K
∆pmet,s = -3 kN/m² Difference of meteorological and atmospheric pressure
∆Hs = 216 m Local height difference, c 2 = 0.012 kPa/m
p0,s = c1∙∆Ts - ∆pmet,s + c2∙∆Hs = 14.8 kN/m² Isochore pressure at summer
ps = ϕ∙p0,s = 1.11 kN/m² Effective internal positive pressure
Winter: ∆Tw = -27 °K Temperature difference, c 1 = 0.340 kPa/°K
∆pmet,s = 6 kN/m² Difference of meteorological and atmospheric pressure
∆Hs = -140 m Local height difference, c 2 = 0.012 kPa/m
p0,w = c1∙∆Tw - ∆pmet,w + c2∙∆Hw = -16.9 kN/m² Isochore pressure at winter
pw = ϕ∙p0,w = -1.26 kN/m² Effective internal negative pressure
Acoustic interlayer
dSZR ≤
Outer laminated glass
Inner laminated glass
PVB interlayer
4.1.2 Glass check
Refer to FEM analysis results in section 4.1.3.
i. Outer laminated heat strengthened pane with edge frit - Stress check
Wind load, σd = 13.69 N/mm² < (W) fg,,d = 20.8 N/mm²
Imposed load only, σd = 16.78 N/mm² < (L) fg,d = 25.0 N/mm²
ii. Inner laminated annealed pane - Stress check
Wind load, σd = 15.44 N/mm² < (W) fg,d = 20.8 N/mm²
Imposed load only, σd = 22.39 N/mm² < (L) fg,d = 25.0 N/mm²
iii. Deflection check
Max. δ = 6.25 mm < 1005/65 = 15.46 mm
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4.1.3 FEM Analysis
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4.2 GL-63b & GL-83b (Vision: 3-side supported)
4.2.1 Effective glass thickness, load sharing and climatic loads
prEN 16612:2013 Glass in building - Design of glass panes Clause
Double glazed unit a = 1.048 m Shorter side of DGU
b = 1.180 m Longer side of DGU
d1o + d1i = 8 + 6 mm
t1 = 0.76 mm G 1 = 0.5 N/mm²
18 mm Air space
d2o + d2i = 4 + 4 mm
t2 = 0.76 mm G 2 = 0.4 N/mm²
Effective glass thickness: Is1 = 306.95 Stiffness [ASTM E:1300]
Γ1 = 0.2119 Shear transfer coefficient
d1ef,w = 12.17 mm Effective thickness for deflection (12)
d1ef,σ = 13.53 mm Effective thickness for stress (13)
Is2 = 45.315 Stiffness
Γ2 = 0.3007 Shear transfer coefficient
d2ef,w = 6.63 mm Effective thickness for deflection (12)
d2ef,σ = 7.33 mm Effective thickness for stress (13)
Climatic effects a/b = 0.89 Aspect ratio
k5 = 0.024 Coefficient for volume per load Table B.3
δ1 = d1ef,w3/(d1ef,w
3+d2ef,w3) = 0.861 Factor of load shared by outerleaf glass (C.1)
a* = 28.9(dSZR∙δ1∙d2ef,w3/k5)
1/4 = 600 mm Characteristic length (C.4)
ϕ = 1/[1+(a/a*)4] = 0.0971 Insulating unit factor (C.3)
Summer: ∆Ts = 27 °K Temperature difference, c 1 = 0.340 kPa/°K
∆pmet,s = -3 kN/m² Difference of meteorological and atmospheric pressure
∆Hs = 216 m Local height difference, c 2 = 0.012 kPa/m
p0,s = c1∙∆Ts - ∆pmet,s + c2∙∆Hs = 14.8 kN/m² Isochore pressure at summer
ps = ϕ∙p0,s = 1.43 kN/m² Effective internal positive pressure
Winter: ∆Tw = -27 °K Temperature difference, c 1 = 0.340 kPa/°K
∆pmet,s = 6 kN/m² Difference of meteorological and atmospheric pressure
∆Hs = -140 m Local height difference, c 2 = 0.012 kPa/m
p0,w = c1∙∆Tw - ∆pmet,w + c2∙∆Hw = -16.9 kN/m² Isochore pressure at winter
pw = ϕ∙p0,w = -1.64 kN/m² Effective internal negative pressure
Acoustic interlayer
dSZR ≤
Outer laminated glass
Inner laminated glass
PVB interlayer
4.2.2 Glass check
Refer to FEM analysis results in section Error! Reference source not found..
i. Outer laminated heat strengthened pane with frit - Stress check
Wind load, σd = 11.91 N/mm² < (W) fg,d = 20.8 N/mm²
Imposed load only, σd = 8.91 N/mm² < (L) fg,d = 25.0 N/mm²
ii. Inner laminated annealed pane - Stress check
Wind load, σd = 14.10 N/mm² < (W) fg,d = 20.8 N/mm²
Imposed load only, σd = 22.13 N/mm² < (L) fg,d = 25.0 N/mm²
iii. Deflection check
Max. centre deflection, δ = 7.60 mm < 1048/65 = 16.12 mm
Max. edge deflection, δ = 4.02 mm < 1180/175 = 6.74 mm
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4.2.3 FEM Analysis
PROJECT NAME DATE
SAMPLE PROJECT IN LONDON TITLE REVISION PAGES
GLASS CHECK 69 of 85
LETTENWEG 118, 4123 ALLSCHWIL, SWITZERLAND TEL.: +41 (0)61 501 8210 / +41 (0)79 508 1651 REGISTERED IN SWITZERLAND │VAT REGISTRATION CHE-437.605.665
PROJECT NAME DATE
SAMPLE PROJECT IN LONDON TITLE REVISION PAGES
GLASS CHECK 70 of 85
LETTENWEG 118, 4123 ALLSCHWIL, SWITZERLAND TEL.: +41 (0)61 501 8210 / +41 (0)79 508 1651 REGISTERED IN SWITZERLAND │VAT REGISTRATION CHE-437.605.665
PROJECT NAME DATE
SAMPLE PROJECT IN LONDON TITLE REVISION PAGES
GLASS CHECK 71 of 85
LETTENWEG 118, 4123 ALLSCHWIL, SWITZERLAND TEL.: +41 (0)61 501 8210 / +41 (0)79 508 1651 REGISTERED IN SWITZERLAND │VAT REGISTRATION CHE-437.605.665
PROJECT NAME DATE
SAMPLE PROJECT IN LONDON TITLE REVISION PAGES
GLASS CHECK 72 of 85
LETTENWEG 118, 4123 ALLSCHWIL, SWITZERLAND TEL.: +41 (0)61 501 8210 / +41 (0)79 508 1651 REGISTERED IN SWITZERLAND │VAT REGISTRATION CHE-437.605.665
PROJECT NAME DATE
SAMPLE PROJECT IN LONDON TITLE REVISION PAGES
GLASS CHECK 73 of 85
LETTENWEG 118, 4123 ALLSCHWIL, SWITZERLAND TEL.: +41 (0)61 501 8210 / +41 (0)79 508 1651 REGISTERED IN SWITZERLAND │VAT REGISTRATION CHE-437.605.665
PROJECT NAME DATE
SAMPLE PROJECT IN LONDON TITLE REVISION PAGES
GLASS CHECK 74 of 85
LETTENWEG 118, 4123 ALLSCHWIL, SWITZERLAND TEL.: +41 (0)61 501 8210 / +41 (0)79 508 1651 REGISTERED IN SWITZERLAND │VAT REGISTRATION CHE-437.605.665
PROJECT NAME DATE
SAMPLE PROJECT IN LONDON TITLE REVISION PAGES
GLASS CHECK 75 of 85
LETTENWEG 118, 4123 ALLSCHWIL, SWITZERLAND TEL.: +41 (0)61 501 8210 / +41 (0)79 508 1651 REGISTERED IN SWITZERLAND │VAT REGISTRATION CHE-437.605.665
PROJECT NAME DATE
SAMPLE PROJECT IN LONDON TITLE REVISION PAGES
GLASS CHECK 76 of 85
LETTENWEG 118, 4123 ALLSCHWIL, SWITZERLAND TEL.: +41 (0)61 501 8210 / +41 (0)79 508 1651 REGISTERED IN SWITZERLAND │VAT REGISTRATION CHE-437.605.665
PROJECT NAME DATE
SAMPLE PROJECT IN LONDON TITLE REVISION PAGES
GLASS CHECK 77 of 85
LETTENWEG 118, 4123 ALLSCHWIL, SWITZERLAND TEL.: +41 (0)61 501 8210 / +41 (0)79 508 1651 REGISTERED IN SWITZERLAND │VAT REGISTRATION CHE-437.605.665
PROJECT NAME DATE
SAMPLE PROJECT IN LONDON TITLE REVISION PAGES
GLASS CHECK 78 of 85
LETTENWEG 118, 4123 ALLSCHWIL, SWITZERLAND TEL.: +41 (0)61 501 8210 / +41 (0)79 508 1651 REGISTERED IN SWITZERLAND │VAT REGISTRATION CHE-437.605.665
PROJECT NAME DATE
SAMPLE PROJECT IN LONDON TITLE REVISION PAGES
GLASS CHECK 79 of 85
LETTENWEG 118, 4123 ALLSCHWIL, SWITZERLAND TEL.: +41 (0)61 501 8210 / +41 (0)79 508 1651 REGISTERED IN SWITZERLAND │VAT REGISTRATION CHE-437.605.665
PROJECT NAME DATE
SAMPLE PROJECT IN LONDON TITLE REVISION PAGES
GLASS CHECK 80 of 85
LETTENWEG 118, 4123 ALLSCHWIL, SWITZERLAND TEL.: +41 (0)61 501 8210 / +41 (0)79 508 1651 REGISTERED IN SWITZERLAND │VAT REGISTRATION CHE-437.605.665
PROJECT NAME DATE
SAMPLE PROJECT IN LONDON TITLE REVISION PAGES
GLASS CHECK 81 of 85
LETTENWEG 118, 4123 ALLSCHWIL, SWITZERLAND TEL.: +41 (0)61 501 8210 / +41 (0)79 508 1651 REGISTERED IN SWITZERLAND │VAT REGISTRATION CHE-437.605.665
PROJECT NAME DATE
SAMPLE PROJECT IN LONDON TITLE REVISION PAGES
GLASS CHECK 82 of 85
LETTENWEG 118, 4123 ALLSCHWIL, SWITZERLAND TEL.: +41 (0)61 501 8210 / +41 (0)79 508 1651 REGISTERED IN SWITZERLAND │VAT REGISTRATION CHE-437.605.665
5 Annex
5.1 PVB Interlayer – Shear modulus
By interpolation:
G10min.@30°C = 0.537 – (0.537-0.374)(10-1)/(60-1)
= 0.512 N/mm²
Use: G = 0.5 N/mm² conservatively
PROJECT NAME DATE
SAMPLE PROJECT IN LONDON TITLE REVISION PAGES
GLASS CHECK 83 of 85
LETTENWEG 118, 4123 ALLSCHWIL, SWITZERLAND TEL.: +41 (0)61 501 8210 / +41 (0)79 508 1651 REGISTERED IN SWITZERLAND │VAT REGISTRATION CHE-437.605.665
5.2 Acoustic PVB Interlayer – Shear modulus
By interpolation:
G10min.@30°C = 0.467 – (0.467-0.268)(10-1)/(60-1)
= 0.437 N/mm²
Use: G = 0.4 N/mm² conservatively
PROJECT NAME DATE
SAMPLE PROJECT IN LONDON TITLE REVISION PAGES
GLASS CHECK 84 of 85
LETTENWEG 118, 4123 ALLSCHWIL, SWITZERLAND TEL.: +41 (0)61 501 8210 / +41 (0)79 508 1651 REGISTERED IN SWITZERLAND │VAT REGISTRATION CHE-437.605.665
5.3 IGU Edge seal – Technical data sheat
PROJECT NAME DATE
SAMPLE PROJECT IN LONDON TITLE REVISION PAGES
GLASS CHECK 85 of 85
LETTENWEG 118, 4123 ALLSCHWIL, SWITZERLAND TEL.: +41 (0)61 501 8210 / +41 (0)79 508 1651 REGISTERED IN SWITZERLAND │VAT REGISTRATION CHE-437.605.665