Fibre Reinforced Concrete – fib T4 - Betonica · Fibre Reinforced Concrete – fib T4.1 ... fib...
Transcript of Fibre Reinforced Concrete – fib T4 - Betonica · Fibre Reinforced Concrete – fib T4.1 ... fib...
GBB Event 05/06/2014 – Château de Namur
Fibre Reinforced Concrete – fib T4.1
B. ParmentierHead Div. Structures
Pantheon (-27 à 125)
From opus caementicium to concrete
From cement…J. Smeaton
L.Vicat
… J. Aspdin (ciment Portland) …
1818
[ Problem with concrete ] :
0
10
20
30
40Compression
Tension
Tensile strength
Ductility
…to (prestressed) reinforced concrete
J.L. Lambot
F. Hennebique
J. M onier T. Hyatt
E. Freysinnet
Straw as reinforcement : « Adobe »
But vegetal fibres have limitations.
Arg-é Bam (Iran | -Ve siècle)
My invention (…) consists in a composition formed by mixing two parts of coarse gravel, two parts of sand, two parts of hydraulic lime, and one part of any granular waste iron, (…)
““ “
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Steel (fibres) as reinforcement
James Romualdi
Standardized design methods starting from 1995EC2 Building Code
Kick-off meeting
Dramix GuidelinesInfrastructuur in het
leefmilieu 4-95 Rilem TC162-TDFTest and design
methods for SFRC
2012
Océanographic Museum (Valencia, Spain)Architect : F. Candela
50 kg/m³ 6 cm
Secundary reinforcement
Ultra-High Fibre Reinforced Concrete (UHPC) (2-4% micro-fibres – fc ~150 MPa)
Stade Jean Bouin (Paris, France)Architect : R. R icciotti
reliable ?
Is
this
fib T4.1Fibre Reinforced Concrete
1. Scope
2. Terminology
3. Basic Principles
4. Principles of structural design
5. Materials6. Interface characteristics
7. Design
8. Construction
9. Conservation
10.Dismantlement, recycle and reuse
fib MC 2010
1. Scope
2. Terminology
3. Basic Principles
4. Principles of structural design
5. Materials6. Interface characteristics
7. Design8. Construction
9. Conservation
10.Dismantlement, recycle and reuse
fib MC 20105.1. Concrete5.2. Reinforcing steel5.3. Prestressing steel5.4. Prestressing systems5.5. Non-metallic reinforcement5.6. Fibres / fibre reinforced concrete
Joint chapters prepared by fib TG 8.3 “Fiber reinforced concrete” and fib TG 8.6 “Ultra high performance fiber reinforced concrete”
…7.7. Verification of safety and
serviceability of FRC structures
Post-peak behaviour (fibres only)…
P
P P
PPcr crP
crack formationcrack
crack formation
localization
Softening material Hardening material
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Test methods (mainly used)
Direction tension(RILEM )
3-pt bending(EN 14651)
Round determinated plates(ASTM C1550)
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Diameter 800 mmThickness 75 mm3 supports
MC 2010 Performance classesCharacterization in 3-pt bending (EN 14651)
FR,1
FR,3
0,5 1,5 3,52,5Crack opening
[mm]
Loadhsp = 125mm
L = 500 mm
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MC 2010 Performance classes
Class 2a
a : 0.5 < fR3,k/fR1,k < 0.7
b : 0.7 ≤ fR3,k/fR1,k < 0.9
c : 0.9 ≤ fR3,k/fR1,k < 1.1
d : 1.1 ≤ fR3,k/fR1,k < 1.3
e : 1.3 ≤ fR3,k/fR1,k
2.0 ≤ fR1,k ≤ 2.5
1.01.52.02.53.04.05.06.07.08.0…
fR1,k [MPa]
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Ductility provided by the material (FRC/Rebars)
Ductility provided by the structural redundancy
Minimum ductility (structure)
P
PU
UPEAKSLS
Displacement
SLSP
Load
MAX
P
crack formationPCR
𝜹𝜹𝒖𝒖 ≥ 𝟐𝟐𝟐𝟐 𝜹𝜹𝑺𝑺𝑺𝑺𝑺𝑺
𝜹𝜹𝒑𝒑𝒑𝒑𝒑𝒑𝒑𝒑 ≥ 𝟓𝟓 𝜹𝜹𝑺𝑺𝑺𝑺𝑺𝑺OR
ReliabilityInfluence of orientation 𝒇𝒇𝑭𝑭𝑭𝑭𝑭𝑭,𝒎𝒎𝒎𝒎𝑭𝑭 = ⁄𝒇𝒇𝑭𝑭𝑭𝑭𝑭𝑭 𝑲𝑲
L. Ferrara et al. (2010)
30 mm
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ReliabilityRedistribution coefficient
𝑷𝑷𝑹𝑹𝑭𝑭 = 𝑲𝑲𝑹𝑹𝑭𝑭.𝑷𝑷(𝒇𝒇𝑭𝑭𝑭𝑭)
(𝑲𝑲𝑹𝑹𝑭𝑭)
𝑲𝑲𝑹𝑹𝑭𝑭𝑽𝑽𝑽𝑽𝟐𝟐
,𝑷𝑷𝒎𝒎𝒑𝒑𝒎𝒎𝑷𝑷𝒄𝒄𝒄𝒄
Max load
Cracking load
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1. Introduction
2. Fundamentals
3. Materials
4. Mechanical properties
5. Background of design approaches
6. Background of rules in ULS and SLS
7. Durability (with or without ordinary reinforcement)
8. Severe loading conditions (blast, fire)
9. Technological aspects
10. Structural rehabilitation
11. Design examples and back calculations of full scale tests
12. Seismic resistance
FRC Bulletin (background document)
Fibres for concrete…
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Material Steel fibres
Polymeric fibres (PP,PAN, PE,Aramid,PVA)
Inorganic and mineral fibres (AR glass, basalt, carbon)
Natural fibres
Blends/Cocktails
M C’10
The models are (too ?) safe
Logically, a better match is found for a/d=2.5 (solid marks)
Parmentier et al., Shear – BEFIB 2012
Test results vs. predictions
Support design assumptions by (full-scale) testing
Concentrated loads
Jack
Loadcell
Results
Published papers
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BBRI - Lab. Structures [email protected]