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UoE/Arup-UoE research meeting @ Edinburgh, July 2013

Presented at the 2013 Edinburgh/Arup research meeting which took place in Arup offices at South Queensferry.

Cristian Maluk

on 16 September 2014

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Transcript of UoE/Arup-UoE research meeting @ Edinburgh, July 2013

Engineer concrete structures...
Thorough understanding of spalling
Avoid it

Experimentally replicate the thermal load imposed by the furnace test

Low economic and temporal cost

High precision and high repeatability

Proper statistical study
Mechanical loading
Replicate mechanical conditions near the anchorage zone

Thermal loading
Replicate the thermal conditions of the furnace test using radiant panels

Size of the test specimen
Identical cross section as the full size element
500 mm in length
What now?
Rational Study of
Heat-induced Concrete Spalling
Past Research
Inverse Heat Transfer Model
The Concept
Experimental Validation of the Inverse Heat Transfer Model
Furnace Tests
A novel testing methodology
Behaviour in fire of high-performance CFRP (carbon fibre reinforced polymer) prestressed concrete structural elements

High strength SCC (110 MPa)

CFRP tendons (non-corrosive, high strength)

Slender structural elements (45mm thick)

High prestress conditions (12 MPa)

2 kg/m3 of PP fibres
Edinburgh / Arup research meeting
1-2 July 2013
Heat-induced concrete spalling
Longitudinal splitting cracks and loss of bond
Heat-induced concrete spalling

Polypropylene (PP) fibres

PP fibre type (cross section, diameter) and dosage

With and without compressive stress

11 concrete mixtures

30 days

Design for “real” fire (or fires!!)

Move away from a pass-fail testing environment

Develop of building materials/products at a fraction of the cost

“Understand” materials’ and systems’ behaviour in fire
H-TRIS is a tool…

Experimental studies with statistical confidence

Realistic and/or proper boundary thermal conditions

High repeatability

Low economical and temporal cost
A novel testing methodology
Luke Bisby, Giovanni Terrasi,
Michal Krajcovic, José Luis Torero,
Guillermo Rein, etc.

Technical and Research Staff

PhD and MEng students


Cristián Maluk Zedán
The University of Edinburgh
Factors related to the occurrence of
Heat-Induced Concrete Spalling
Concrete strength (compressive, tensile)
In-service mechanical stress condition
Moisture content
Type of aggregate
Type of cement
Casting technique (vibrated concrete, SCC, spun concrete)
PP-fibre inclusion
Admixtures inclusion (fly ash, silica fume, etc.)
Heating rate
Internal reinforcement (type, ratio, tie configuration)
Structural form (shape, size, thickness, span, etc.)
H-TRIS 2.0 with larger exposed surface & higher max incident HF

Further experimental validation - replicate thermal loading of the furnace test to a range of building materials

Time-history HF from fire models ("real" fires)

60 min
16.36 kJ/m2
7.9 min
10.6 min
16.3 min
1.61 kJ/m2
2.22 kJ/m2
3.64 kJ/m2
Radiant panels
Loading rig
Linear motion system
thermal energy!
Very complex
BRE Centre for Fire Safety Engineering
BRE Centre for Fire Safety Engineering
Inverse Model
A "plan"
Potential to benefit the modern building design process...
3m long span
Cold overhangs
Simply supported
Four-point bending (decompression at the tension fibre in the central region)
200x45 m2 cross section
Standard fire resistance test...
What's next...
Full transcript