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The Future of Façades
Recent research at the gFT research group
CAB “Fit for the Future” Conference
Loughborough, 14th May 2015
Department of Engineering
Dr Mauro Overend Glass & Façade Technology Research Group
University of Cambridge
Overview gFT
2
Part 1 Context
trends, challenges & opportunities in glass
& façade engineering
CAB Technical Conference | Loughborough| May 2015
Part 2 Introduction to the gFT research group
aims & objectives, set-up and research
themes
Part 3 Research projects
overview of recently completed and on-
going research projects
Part 1 Context gFT
1. Dematerialisation
Apple Cube, New York
Steel plate
Glass plate
Adhesive
P
P
6 CAB Technical Conference | Loughborough| May 2015
2. Robustness
8
9 CAB Technical Conference | Loughborough| May 2015
3. Complex geometry
Centre de Communication Citroen, Paris
12
TGV Station, Strasbourg, France
Heydar Aliyev Cultural Centre, Azerbaijan
4. Energy efficiency
16
Interpane, Germany
17
Institut Du Monde Arabe, Paris
Self-adjustingSelf-adjusting Externally activatedExternally activated
Ph
oto
ch
rom
icT
he
rmo
ch
rom
icT
he
rmo
tro
pic
Ph
oto
ch
rom
icT
he
rmo
ch
rom
icT
he
rmo
tro
pic
Liq
uid
Cry
sta
lS
us
pe
nd
ed
Pa
rtic
leE
lec
tro
ch
rom
icG
as
o-
ch
rom
icL
iqu
id C
rys
tal
Su
sp
en
de
d
Pa
rtic
leE
lec
tro
ch
rom
icG
as
o-
ch
rom
ic
Long life
High cost
Small panels
Long life
High cost
Small panels
Low E
Durability
Lt trans
Yellow
Low E
Durability
Lt trans
Yellow
Thermal perform
Durability (UV)
Opaque in
darkened state
Thermal perform
Durability (UV)
Opaque in
darkened state
Established tech
V. Poor thermal
performance
Established tech
V. Poor thermal
performance
Est. tech
High heat
to light
Est. tech
High heat
to light
High light to heat gain
Proven technology / low cost
switching time for large panels
Durability issues
High light to heat gain
Proven technology / low cost
switching time for large panels
Durability issues
Gas
injection
switching
Gas
injection
switching
18 CAB Technical Conference | Loughborough| May 2015
5. Market trends
• The global gross output of the curtain wall market is steadily
increasing driven by the world economy in general and the
construction industry in particular
• Europe and the United States have traditionally been the
two largest markets but are being matched by China, which
has shown the fastest growth in demand
Total market size of the global curtain wall industry for the periods specified (Synovate report)
Market segmentation of the global curtain wall industry
by countries and regions for the periods specified.
(Synovate report)
20 CAB Technical Conference | Loughborough| May 2015
• Demand has been shifting
from stick to unitized
systems because they:
– rely less on skilled labour
– provide more consistent
quality
– are more capable of offering
advanced technological
developments
• The introduction of
proprietary unitised
systems makes it now
viable for projects where:
– the façade area is relatively
small
– the procurement programme
could not afford long lead-in
periods
Market segmentation of the global curtain wall industry
by product type for the periods specified.
(Synovate report)
21 CAB Technical Conference | Loughborough| May 2015
6. Guidelines & standards
Relativity by M.C. Escher (1953)
Part 2 Introduction to the gFT research group gFT
Cambridge University Engineering Department gFT
• Largest integrated engineering department in UK and largest
department at Cambridge.
• Greatest concentration of world-leading engineering research in
the UK (REF 2014). Consistently in top 5 engineering departments
globally.
• 145 research-active faculty, >200 contract research staff, >600
research students.
• Research portfolio of approximately £90 million. One third of this
income comes from collaboration with industry.
• Since 2001, staff and students founded over 20 spin-out and start-
up companies with a total investment of over £50 million.
sbe
Div B Electrical
Engineering
Div C Mechanics Materials &
Design
Div A Energy, Fluid Mechanics &
Turbomachinery
Div D Civil, Structural & Environmental
Engineering
Div E Manufacturing &
Management
Div F Information Engineering
Department of Engineering
25 CAB Technical Conference | Loughborough| May 2015
On-going research projects:
• Bi-treated Glass
• Cold Bent Glass
• Post-Fracture Performance of Glass
• Adaptive Façades
• Wind loading on Complex Facades
• Composite Glass Structures
The Glass and Façade Technology Research
Group aims to provide solutions to real- world
challenges in the field of structural glass and
façade engineering through fundamental and
application-driven research. The challenges
range form energy demand in buildings to the
mechanical performance of glass and façade
design / construction processes.
Recently completed research projects:
• Multi-Objective Optimisation of Facades
• Novel Glass Connections
• Building Envelope Information Model
www.gf t .eng.cam.ac.uk
IEQ
co
st
(£/y
ea
r)
Projections
Pareto-front set
30% 70% Window-to-wall ratios
Steel-Glass Composite Panels
Department of Engineering
Project #1
conclusions gFT
Concrete composite floor: The inspiration behind the development of
a steel-glass composite façade system
Simplified CAD visualisation of the proposed steel-glass composite façade system
Glass panels
Steel RHS adhesively
bonded to glass
Silicone sealant
28 CAB Technical Conference | Loughborough| May 2015
predictive models: stress-based gFT
Small-scale steel-glass SLS joint
THE SIX CANDIDATE ADHESIVES
Two-part epoxies (3M DP490 & 3M 2216B/A) Two-part acrylates (Araldite 2047 & H3295) Two-part epoxy/acrylate hybrid (3M 7271B/A) Two-part silicone (DC 993)
Results
Three of the adhesives showed good shear strength at 3mm gap fill (mean shear strength > 10MPa ) while being reasonably flexible
29 CAB Technical Conference | Loughborough| May 2015
Adhesive characterisation gFT
Adhesive dumbbell specimens for uniaxial tensile tests
Cylindrical adhesive specimen undergoing compression- relaxation tests
Stress-strain plots of compression relaxation tests
30 CAB Technical Conference | Loughborough| May 2015
Small scale tests gFT
Schematic drawing of the 4PB test set-up
31 CAB Technical Conference | Loughborough| May 2015
Small scale tests gFT
32 CAB Technical Conference | Loughborough| May 2015
Small scale tests gFT
33 CAB Technical Conference | Loughborough| May 2015
Small scale tests gFT
34 CAB Technical Conference | Loughborough| May 2015
Small scale tests gFT
35 Research Presentation at EPFL | Switzerland | Aug 2014
Failure mode: Glass failure preceded by local adhesive failure
and yielding of steel section
Small scale tests gFT
36 CAB Technical Conference | Loughborough| May 2015
Small scale tests gFT
37 CAB Technical Conference | Loughborough| May 2015
Large scale tests gFT
38 CAB Technical Conference | Loughborough| May 2015
Large scale tests gFT
Specimen A2: Double glazed & one-way spanning Load to 1st glass failure = 33kN @ 32mm
PF load = 18kN @ 115mm Maximum deflection = 170mm
Failure mode: Glass failure preceded by yielding of the steel square sections giving an elasto-pseudo plastic response
39 CAB Technical Conference | Loughborough| May 2015
Large scale tests gFT
40 CAB Technical Conference | Loughborough| May 2015
Large scale tests gFT
0
5
10
15
20
25
30
35
40
45
0 20 40 60 80 100 120 140 160 180
Lo
ad
(k
N)
Centre Displacement (mm)
41 CAB Technical Conference | Loughborough| May 2015
Future work in Composite Glass Structures …
FRP-Glass composite gFT
43 CAB Technical Conference | Loughborough| May 2015
Multi-objective design optimisation of façades
Department of Engineering
Project #2
High-performance Façade
Technologies
3 / 19
A multi-objective assessment and optimisation tool gFT
45
Multi-objective Design of Facades
• Economy
- Up to 25% of the total building cost
- £400/m2 ~ £2000/m2
• Sustainability
- Embodied energy
- Energy demand
• Occupant comfort
- Thermal comfort
- Aural comfort
- Visual comfort
- Indoor air quality
Conventional façades vs. high-performance façades
• Lower initial capital cost.
• Static shading reduce daylight
• Blinds reduce view-out.
• Larger HVAC system.
• Higher artificial lighting load
• Higher initial capital cost.
• BMS controlled shading
• Better view-out.
• Smaller HVAC system.
• Better use of daylight.
A multi-objective assessment and optimisation tool gFT
46 CAB Technical Conference | Loughborough| May 2015
Optimisation method: Non-dominated Sorting Genetic Algorithm-II (NSGA - II)
A multi-objective assessment and optimisation tool gFT
47 CAB Technical Conference | Loughborough| May 2015
Multi-objective optimisation tool – Case Study gFT
48 CAB Technical Conference | Loughborough| May 2015
Multi-objective optimisation tool – Case Study gFT
49 CAB Technical Conference | Loughborough| May 2015
• Locations: London, Helsinki, Rome
• Orientations: E/W/N/S
• Office type: Open-plan, cellular
• Method: SRC / Sobol’s total
Multi-objective optimisation tool – Parameter Sensitivity gFT
50 CAB Technical Conference | Loughborough| May 2015
Future work in Façade Optimisation …
gFT
Optimisation of Adaptive Facades
52
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
T vis
[-]
g-value [-]
DGU U=2.5 +- 2*0.6 [XX]
Electrochromic
NIR Electro-chromics [XX]
Photo-Volta-Chromic DR [XX]
Tvis and NIR EC DR [XX]
Electrochromic
EC All solid state - Econtrol
EC All solid state - SaintGobain
EC All solid state - SAGE
Gasochromic Interpane
1. DGU 42. DGU 14-5. EC DGU ke=2.26-7. EC DGU ke=2.41
+ 8.Tvis/NIR EC DGU
4
3
2
1
52 CAB Technical Conference | Loughborough| May 2015
53 CAB Technical Conference | Loughborough| May 2015
glass &
façade technology
research group gFT
www.g ft .eng .cam.ac .uk