A Structural Fire Engineering Prediction for the Veselí Fire Tests, 2011

Shan-Shan Huang, Ian Burgess & Buick Davison

ASFE ‘Prague 2011

02/05/2011 © The Czech Technical University

COMPFIRE Demonstration Tests in Veselí

1000

800

2000

2000

2000

1200

± 0,000

+ 1,200

+ 3,200

+ 5,200

+ 7,200

+ 8,000

+ 9,000

4000

1000

A B C

4000

FLOOR 2 FIRE TEST NO. 1

± 0,000

+ 4,000

+ 8,000

+ 9,000

FIRE TEST NO. 2

IPE 220

IPE 330

IPE 270

IPE 270

FLOOR 1

02/05/2011 © The Czech Technical University

Test Arrangement

02/05/2011 © The Czech Technical University

Floor Plan

IPE 270

IPE 270

IPE 240 - FIRE PROTECTED

IPE 240 - FIRE PROTECTED

IPE

240

- PR

OT.

IPE 220 / IPE 330

IPE 270

A

9000 3000

B C

6000

3000

1

2

3

IPE

220

/ IPE

330

IPE

270A A

5000

IPE 240 - PROT.

IPE 240 - PROT.

IPE

240

- PR

OT.

IPE

240

- FI

RE

PRO

TEC

TED

2000 (1200)

WINDOW

700

700 700

IPE

240

- FI

RE

PRO

TEC

TED

HEB 200

TR 245/8 TR 245/8 TR 245/8

TR 245/8

TR 245/8

HEB 200

HEB 200HEB 200

700

COFRAPLUS 60 (60 mm)C 30/37 (60 mm)

13400

1040

0

02/05/2011 © The Czech Technical University

Vulcan ModelCharacteristic design loads

Dead load: Slab 2.35 kN/m2

Flooring 0.5 kN/m2

Live load: Payload 3.0 kN/m2

Partitions 0.5 kN/m2

Applied load on slab to the model: 6.35 kN/m2

Point loads on columns: 2.85 kN/m2

Gas temperature: 1046°C at 60 minutes

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200

400

600

800

1000

1200

0 20 40 60 80 100 120140

Gas Temperature (°C)

Time (minute)

EC type of fire curve applied to the model

02/05/2011 © The Czech Technical University

Assumptions made in the Vulcan Model

• Circular CFT columns modelled as equivalentsquare CFTs;

• Connections represented by rotational spring elements;

• Varying the rotational stiffnesses of the springs to model rigid, semi-rigid and pinned connections;

• Composite slab with trapezoidal decking modelled as a flat slab with different bending stiffnesses in the two orthogonal directions.

02/05/2011 © The Czech Technical University

Temperature Distribution

50% Tgas

20°C

80% Tgas95% Tgas

45% Tgas50% Tgas

50% Tgas100% Tgas

15% Tgas

02/05/2011 © The Czech Technical University

Vulcan Analysis Results

Model No.

Connection Rigidity

Rotational Spring Stiffness

(Nmm/rad)

1 Pinned 100

2 Semi-rigid 5x105

3 Semi-rigid 1x109

4 Semi-rigid 1x1010

5 Rigid 1x1012

-1000

-900

-800

-700

-600

-500

-400

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-200

-100

0

0 20 40 60 80 100 120

Vertical displacement (mm)

Time (minute)

Model 1Model 2Model 3Model 4Model 5

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Deformation Shape

020040060080010001200

0 20 40 60 80 100 120140

Gas Temperature (°C)

Time (minute)

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Deformation Shape

020040060080010001200

0 20 40 60 80 100 120140

Gas Temperature (°C)

Time (minute)

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Deformation Shape

020040060080010001200

0 20 40 60 80 100 120140

Gas Temperature (°C)

Time (minute)

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Deformation Shape

020040060080010001200

0 20 40 60 80 100 120140

Gas Temperature (°C)

Time (minute)

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Deformation Shape

020040060080010001200

0 20 40 60 80 100 120140

Gas Temperature (°C)

Time (minute)

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Deformation Shape

020040060080010001200

0 20 40 60 80 100 120140

Gas Temperature (°C)

Time (minute)

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Deformation Shape

020040060080010001200

0 20 40 60 80 100 120140

Gas Temperature (°C)

Time (minute)

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Deformation Shape

020040060080010001200

0 20 40 60 80 100 120140

Gas Temperature (°C)

Time (minute)

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Deformation Shape

020040060080010001200

0 20 40 60 80 100 120140

Gas Temperature (°C)

Time (minute)

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Deformation Shape

020040060080010001200

0 20 40 60 80 100 120140

Gas Temperature (°C)

Time (minute)

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Deformation Shape

020040060080010001200

0 20 40 60 80 100 120140

Gas Temperature (°C)

Time (minute)

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Deformation Shape

020040060080010001200

0 20 40 60 80 100 120140

Gas Temperature (°C)

Time (minute)

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Deformation Shape

020040060080010001200

0 20 40 60 80 100 120140

Gas Temperature (°C)

Time (minute)

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Deformation Shape

020040060080010001200

0 20 40 60 80 100 120140

Gas Temperature (°C)

Time (minute)

02/05/2011 © The Czech Technical University

Connection Forces

1

23 4

-400

-300

-200

-100

0

100

200

300

400

0 20 40 60 80 100 120

Connection force (kN)

Time (minute)

Connection 1Connection 2Connection 3Connection 4

Tension

Compression

Model 5 - Rigid Connections

02/05/2011 © The Czech Technical University

Summary

• An initial prediction of the Veselí test, in which a composite structure will be tested under natural fire;

• Awaiting precise data, such as the temperature distributions, to be confirmed when the tests are performed;

• conservative assumptions have been made at this pre-test prediction stage;

02/05/2011 © The Czech Technical University

Summary

• Five models of identical setup but different connection rigidities were analysed;

• The deformation shapes of the models are similar;

• The effect of connection rigidity on the fire resistance and deformability of the structure is considerable;

• The fire resistance of the structure is enhanced by increasing the rotational stiffnesses of the connections. -400

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-100

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100

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400

0 20 40 60 80 100 120

Con

nect

ion

forc

e (k

N)

Time (minute)

Tension

Compression

Thank you.Acknowledgment: The research leading to these results has received funding from theEuropean Community's Research Fund for Coal and Steel (RFCS) under grantagreement n° RFSR-CT-2009-00021.