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SCI Paper - Coat-back requirements - 1997
Rules for the determination of coat-back requirements
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SUMMARY
Most operators’ current specifications require an extensive length of any attachment to primary steelwork protected with Passive Fire Protection (PFP) to be similarly protected. This is done to avoid heat transfer into the steelwork requiring protection and is commonly referred to as ‘coat-back’. The attachment acts as a heat conductor into the primary steelwork. Hence, it can introduce a localised ‘hot spot’ at its connection with the primary member. The extent of the hot spot depends on the relative geometries of the primary member and the attachment. The purpose of the coat-back is to reduce heat conducted through the attachment into the primary member and hence limit the extent and severity of the local hot spot. In this way, the potential of premature failure can be avoided. The coat-back length needs to be adequate to achieve this objective.
The protection requirements to attachments (coat-back length) represent a substantial percentage of the overall PFP requirements, and cost. This paper presents the findings of a project which studied the effect of attachments on the thermal and structural behaviour of primary members in a wide range of configurations. The objective of the project was to develop design rules which enable operators to specify coat-back requirements to attachments using rules based on fire engineering input, thus leading to technical and economic benefits.
TABLE OF CONTENTS
- INTRODUCTION
- EFFECT OF ATTACHMENTS ON THERMAL BEHAVIOUR
- Passive fire protection material properties
- Geometric configurations for thermal analysis
- Finite element model for thermal analysis
- Analysis results
- Effect of fire duration
- Effect of PFP material type
- Design method for assessing the effect of coat-back
- Limitations for coat-back rules
- EFFECT OF ATTACHMENTS ON STRUCTURAL BEHAVIOUR
- Geometric configurations for structural analysis
- Finite element model for structural analysis
- Analysis results
- CONCLUSIONS
- ACKNOWLEDGEMENT
- REFERENCES
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