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

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

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

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

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

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

concrete structures – challenge for resiliency

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

Do we need to use such high amount of concrete?

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

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

concept of precast RC frame for energy efficient buildings

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

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

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

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

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

prestressed floor girders

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

construction of the experimental frame

construction of the experimental frame

construction of the experimental frame

conclusions

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

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

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