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Cardington Fire Test January 16. 2003 David Moore, František Wald, Aldina Santiago BRE Watford, CTU in Prague, Coimbra University TENSILE MEMBRANE ACTION.

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Presentation on theme: "Cardington Fire Test January 16. 2003 David Moore, František Wald, Aldina Santiago BRE Watford, CTU in Prague, Coimbra University TENSILE MEMBRANE ACTION."— Presentation transcript:

1 Cardington Fire Test January David Moore, František Wald, Aldina Santiago BRE Watford, CTU in Prague, Coimbra University TENSILE MEMBRANE ACTION AND ROBUSTNESS OF STRUCTURAL STEEL JOINTS UNDER NATURAL FIRE EC FP5 HPRI – CV 5535 ECCS TC 10, Prague March 13-16, 2003

2  Cardington Laboratory  Structural Integrity Test  Preparation  Temperatures  Connections  Composite slab  Conclusion Contents

3 Cardington, Hangar

4 Experimental area 48m x 65m x 250m

5 Timber structure - 5 floor

6 Concrete structure - 7 floor

7 Erected 1993 Eight floors Plan area m 2 Steel braced frame Connections : beam-column connections: flexible end plates beam-beam connections: fin plates Steel composite structure

8 Typical composite structure

9  Cardington Laboratory  Structural Integrity Test  Preparation  Temperatures  Connections  Composite slab  Conclusion Contenta

10 Fire experiments

11 TestDescriptionFire compartmentLoading size, marea, m 2 FireMech. G + % Q 1One beam8 x 324Gas30% 2One frame21 x 2,553Gas30% 3Corner comp.10 x kgm -2 30% 4Corner comp.9 x kgm -2 30% 5Large comp.21 x kgm -2 30% 6Office18 x kgm -2 30% 7Integrity11 x kgm -2 56% Summary of fire tests

12 Summary of duration, temp and deformations TestOrg.LevelDurationTemperatures, °CDeformation, mm (mins).Atmossteelmaximalresidual 1BS BS BS BRE BRE BS ČVUT ~

13 Test 2 – Column shortening

14 Structural Integrity Test January, Project team Mr. Martin BenešResearch Student, CTU Prague Mr. Luis BorgesResearch Student, University Coimbra Mrs. Petra HřebíkováResearch Student, CTU Prague Mrs. Magdaléna ChladnáResearch Student, Slovak Technical University, Bratislava Mr. David Jennings Engineering Technician, BRE Watford Mr. Tom Lennon Supervising Engineer, BRE Watford Dr. David Moore Project Director, BRE Watford Mrs. Aldina SantiagoResearch Student, University Coimbra Prof. Luis S. da SilvaResearch Group Member, University Coimbra Mr. Paul SimsProject Manager, University Coimbra Dr. Zdeněk SokolResearch Group Member, CTU Prague Dr. Jan PašekResearch Group Member, CTU Prague Mr. Nick PettyContracted Technicians, BRE Watford Mr. Jiří SvobodaRes. Group Member, TMV SS, Prague Prof. Frantisek WaldEuropean Research Group Leader, Prague Mr. David White Project Leader, BRE Watford )

15 Tensile membrane action and robustness of structural steel joints under natural fire EC FP5 HPRI - CV 5535 Participanting Institutions Building Research Establishment Czech Technical University in Prague Coimbra University, Technical University, Bratislava Research Project

16 Objectives To determine the:-  Temperatures in elements and joints  Internal forces in the connections  Behaviour of the composite Slab

17  Cardington Laboratory  Structural Integrity Test  Preparation  Temperatures  Connections  Composite slab  Conclusion Contents

18 Wall 3 layers of gypsum plasterboard (15 mm + 12,5 mm + 15 mm) with K = 0,19 – 0,24 W/mK Window 9 m x 1,27 m Fire Compartment

19 Columns External joints 1 m of the primary beam 15 mm of Cafco300 vermiculite-cement spray K = 0,078 W/mK Protected Members

20 Permanent 100% Variable permanent 100% Live 56% by sand bags Mechanical Load

21 Timber cribs 50 x 50 mm - fire load 40 kg/m 2 Fire Load

22 148 thermocouples 57 strain gauges Instrumentation

23 37 deformations

24 10 video cameras 2 thermo cameras

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30  Cardington Laboratory  Structural Integrity Test  Preparation  Temperatures  Connections  Composite slab  Conclusion Contents

31 Temperatures Gas 1108 °C in 55 min. (predicted 1078 °C in 53 min.) Beam 1088 °C in 57min. (predicted 1067 °C in 54 min.) Prediction ENV Back of compartment Average gas temperture Front of compartment

32 Heating Cooling Thermo-cameras Temperature profiles

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73  Cardington Laboratory  Structural Integrity Test  Preparation  Temperatures  Connections  Composite slab  Conclusion Contents

74 Fin Plate Temperature Profile

75 Header Plate Temperature Profile

76 Header Plate Strain Gagues

77 Local Buckling of Beam Lower Flanges

78 Fracture of End-Plates

79 Ovalization of holes in the web beam in the fin plate joints

80 Column Flange Buckling

81 Beam Web Shear Zones

82  Cardington Laboratory  Structural Integrity Test  Preparation  Temperatures  Connections  Composite slab  Conclusion Contents

83 Concrete slab cracking

84 Concrete slab deformation Residual deformation max 925 mm

85  Fracture of end plates  Elongation of holes in fin plates  Integrity of composite slab  Collapse of structure not reached  Mechanical load 56%  Fire load 40 kg/m 2 Conclusions

86 Thank you for your attention


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