Petr Hájeka, Ctislav Fiala a, Antonín Lupíšek b
Czech Technical University in Prague
a Faculty of Civil Engineering, Department of Building Structures
b University Centre for Energy Efficient Buildings
CONCRETE STRUCTURES
FOR BUILDINGS
IN A CHANGING WORLD
Petr Hájek
1707
Starting points
World population growth
Increasing number of natural
4.7 x
disasters
Source: WMO - www.wmo.int
Increasing number of man-made
disasters
Petr Hájek
Disasters – life and economic losses
Natural events
Earthquakes
Tsunamis
Floods
Fires
Storms
Hurricanes
Tornados
Land slides
Heat waves
Cold waves
……….
Petr Hájek
Life and
economic losses
Extreme
natural
events
Population
Disasters – life and economic losses
Natural events
Earthquakes
Tsunamis
Floods
Fires
Storms
Hurricanes
Tornados
Land slides
Heat waves
Cold waves
……….
Petr Hájek
Life and
economic losses
Extreme
natural
events
Population
Increasing volume of life
and economic losses
Disasters – increasing economic losses
Petr Hájek
Source: Swiss Re Economic Research & Consulting
Structures should be
better prepared for new
conditions –
they should be more
resilient
Petr Hájek
concrete structures –
challenge for resiliency
Petr Hájek
environmental impact of concrete structures
Cement production:
5 - 8% of global CO2
emissions
embodied in 1 kg of material
embodied CO2 (kg)
embodied SO2 (g)
embodied energy (MJ)
concrete
0,132
0,46
0,8
bricks
0,247
0,94
2,8
light concrete
0,456
1,40
4,3
mortar
0,181
0,60
1,5
reinforcement steel
0,768
3,63
13,6
Petr Hájek
Do we need to use such
high amount of concrete?
Petr Hájek
advantages of concrete structures
Energy efficiency
 Thermal mass
Environmental
Resource savings
 Use of waste materials
 Acoustics
 Fire resistance
Quality of indoor environment
Safety
Social
 Mechanical resistance
 Durability
Safety
Economical efficiency
 Easy maintenance
Economical efficiency
Economic
 Flexibility / adaptability Economical efficiency
Petr Hájek
subtleness x robustness
Sustainability
Environmental
aspects
Resiliency
saving material
sources - subtle
structures
robust structures
Subtleness
Robustness
Petr Hájek
concept of precast RC
frame for energy efficient
buildings
Petr Hájek
EXPERIMENTAL
SUBTLEbearing
RC FRAME frame OSEEB
concept
of load
- subtle precast elements
- lightened floor panels
- flat ceiling
- flexibility – large spans up to 9 x 9 m
- fast construction
- design for dismounting
Conceptual solution:
- use of FC 70/85
- use of Peikko corbels joints
- prestressed flat girders and floor panels
- lightening elements from recycled materials
- transverse post tensioning
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concept of building envelope for EEB
Load bearing structure
- subtle RC precast frame
Building envelope
- light timber frame structure
- heavily insulated by thermal
insulation
- subtle columns integrated in
building envelope
- C-shape of columns enable
integration of thermal insulation
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floor structure – flat RC slab
STRUCTURAL SCHEME
cross post tesioning
RC lightened panells
prestressed
pannels
prestressed
main flat girder
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floor panels – optimization of lightening
Wood
shavings
concrete
Stered
/Stered
concrete
•
•
•
•
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Weight
Acoustic – airborn sound
Fire safety
Environmental impact
Liapor
concrete
prestressed floor panels | RC floor panels
tubes for transverse post tensioning
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prestressed floor girders
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RC columns with Peikko corbels
Verification of cohesion of HPC and corbel of
Peikko system
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construction of the experimental frame
Petr Hájek
construction of the experimental frame
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construction of the experimental frame
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conclusions
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1
conclusion
Optimized subtle RC precast frame
system OSEEB represents robust
solution to be used as a load bearing
structure for multistory timber based
buildings
subtle and robust
Petr Hájek
2
conclusion
Technical properties of concrete and new
types of concrete enable construction of
natural disasters
structures for
Petr Hájek
reliable
durable
safe
resilient
socially
the changing World
in order to insure sustainable
life for the future generation
Thank you for attention
Petr Hájek
Petr Hájek