JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 40

CONSTRUCTION domes
Focus
they make it possible to produce oversized
construction materials that were of a single
piece, without joints? Large, slender gilded
volumes without marks?
"We knew that the Multiplast Company
makes satellite antennas for military purposes, parabolas and boat hulls and, therefore,
that they knew how to work with curves in
their composite creations. It was also of interest that mechanical fastenings can be used
with fibreglass.
"So we decided to work with this company,
which is internationally reputed for its knowhow in competitive multihull construction.
The onion domes were fabricated in their
facilities in Vannes (Brittany) by assembling
huge golden petals on site."
The world's first Orthodox
onion domes made of composites
Composite materials are in widespread use
in the aerospace and marine industries,
but seen more rarely in building and
construction, so the use of this technology
to make the cathedral's domes is a world
first. The target was a strong and very
lightweight material that could meet the
tolerance requirements and be used to

More progress needs to be made in legislation for the building and civil engineering industry
with regard to the use of composite materials
Innovations are exceptional and therefore difficult to account for. The legislation on building and
construction is very strict and does not provide for these "firsts" and "exploits" accomplished with
composite materials. So, how to proceed?
The domes' impermeability had to be guaranteed for compliance with regulations, but the General
Commission on natural and technological risks has established no code of practice for a roof
made of glass-fibre-reinforced composite. As a consequence, to comply with the unified technical
document (DTU) on roofing, it became necessary to ensure that the concrete domes underneath
were leaktight, complicating matters.
In order to obtain insurance coverage for the monument, Wilmotte also had to file for an "ATEx"
technique rating from the scientific and technical centre for the building industry CSTB, providing
all the necessary evidence on this non-standard building technique. They made their case for
the technical aspects of the project before the CSTB, including dome assembly, impermeability,
weatherability, fire protection requirements, and the joint between dome and cross.

produce oversized elements.
The technology's twofold advantage is that
it reduced the weight of the domes (the
large dome, which would have weighed 42
metric tons if made in standard materials,
weighs only eight metric tons) and enabled a shorter overall completion deadline,
since the domes were prefabricated as the
shell construction was taking place.
A nine-month fabrication process
Fabrication of the five domes started
during June 2015 with the creation of the
moulds, an individual one for each petal.

Holy Trinity Cathedral, Paris ©Alessandra Chemollo

40

jec composites magazine / No113 June 2017

The largest dome consists of eight lower
petals, four upper ones, and an end cone to
support the cross. The four smaller domes
consist of three petals and an end cone.
Three plies of glass fibre were laid up in
each mould to make a petal. The fibre was
then covered with a thermoplastic foam
50-mm thick, and then with three more
glass-fibre plies. To mould the petals,
vacuum infusion was used. In this process,
epoxy resin is injected once the vacuum is
installed. It diffuses throughout the fibres,
and the laminate is then cured and released
from the mould.



Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #113 - June 2017

Cover
Edito
Opinion: High temperature composites
Contents
NEWS
In brief
Strategy
Agenda
BUSINESS
Recycling
Second life
Thermoset resin - Part A
MANUFACTURING
Mass production
Design-to-cost
Feature Construction - The future of building
Editorial
JEC Innovation Awards Programme
International JEC Conferences: knowledge and networking
Education
Education
Domes
Sustainable development
Facade
Interior
Safety
Biocomposites
SOLUTIONS
Marine
Automotive
Aircraft
In the world
TECHNOLOGY
Mecanics
Simulation
Technical textile
Repair
Index
Advertisers
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 76
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Cover
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 2
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Edito
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Opinion: High temperature composites
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 5
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Contents
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 7
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - In brief
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 9
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 10
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Strategy
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 12
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 13
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Agenda
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 15
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Recycling
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Second life
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 18
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Thermoset resin - Part A
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 20
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Mass production
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 22
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 23
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Design-to-cost
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 25
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 26
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 27
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Editorial
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - JEC Innovation Awards Programme
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 30
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 31
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - International JEC Conferences: knowledge and networking
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 33
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 34
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 35
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Education
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 37
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Education
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Domes
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 40
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 41
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Sustainable development
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 43
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Facade
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 45
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Interior
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 47
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 48
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Safety
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 50
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Biocomposites
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 52
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Marine
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 54
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Automotive
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Aircraft
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 57
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - In the world
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 59
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Mecanics
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 61
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 62
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Simulation
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 64
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 65
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 66
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Technical textile
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 68
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 69
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Repair
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 71
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 72
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 73
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - Advertisers
JEC COMPOSITES MAGAZINE - Issue #113 - June 2017 - 75
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