1. Concrete structures FOR BUILDINGS IN A CHANGING WORLD
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
1707
Concrete structures FOR BUILDINGS IN A CHANGING WORLD

2. Starting points World population growth Increasing number of natural
disasters
4.7 x
Source: WMO -
Increasing number of man-made
disasters

3. Life and economic losses
Disasters – life and economic losses
Natural events
Earthquakes
Tsunamis
Floods
Fires
Storms
Hurricanes
Tornados
Land slides
Heat waves
Cold waves
……….
Life and economic losses
Population
Extreme natural
events
Population
Extreme natural events
Population
Extreme natural events

4. Life and economic losses Increasing volume of life and economic losses
Disasters – life and economic losses
Natural events
Earthquakes
Tsunamis
Floods
Fires
Storms
Hurricanes
Tornados
Land slides
Heat waves
Cold waves
……….
Life and economic losses
Population
Extreme natural
events
Increasing volume of life and economic losses

5. Disasters – increasing economic losses
Source: Swiss Re Economic Research & Consulting

6. Structures should be better prepared for new conditions –
they should be more resilient

7. concrete structures – challenge for resiliency

8. Cement production: 5 - 8% of global CO2 emissions
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

9. Do we need to use such high amount of concrete?

10. Environmental Social Economic advantages of concrete structures
Thermal mass
Use of waste materials
Acoustics
Fire resistance
Mechanical resistance
Durability
Easy maintenance
Flexibility / adaptability
Energy efficiency
Environmental
Resource savings
Social
Quality of indoor environment
Safety
Safety
Economic
Economical efficiency
Economical efficiency
Economical efficiency

11. saving material sources - subtle structures
subtleness x robustness
Sustainability
Environmental
aspects
Resiliency
saving material sources - subtle structures
robust structures
Subtleness
Robustness

12. concept of precast RC frame for energy efficient buildings

13. concept of load bearing frame OSEEB
EXPERIMENTAL SUBTLE RC FRAME
- 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

14. 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

15. floor structure – flat RC slab
STRUCTURAL SCHEME
cross post tesioning
RC lightened panells
prestressed pannels
prestressed main flat girder

16. floor panels – optimization of lightening
Wood shavings concrete
Stered
/Stered concrete
Weight
Acoustic – airborn sound
Fire safety
Environmental impact
Liapor concrete

17. prestressed floor panels | RC floor panels
tubes for transverse post tensioning

18. prestressed floor girders

19. RC columns with Peikko corbels
Verification of cohesion of HPC and corbel of Peikko system

20. construction of the experimental frame

21. construction of the experimental frame

22. construction of the experimental frame

23. conclusions

24. 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

25. 2 reliable durable safe resilient
conclusion 2
Technical properties of concrete and new types of concrete enable construction of
reliable
durable
safe
resilient
structures for the changing World
natural disasters
socially

26. in order to insure sustainable life for the future generation
Thank you for attention