post fire stability hans gerlich for winstone wallboards ltd
TRANSCRIPT
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Post Fire Stability
Hans Gerlich
for Winstone Wallboards Ltd
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‘Post-Fire’ ‘Stability’
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‘Stability’vs
‘Structural Adequacy’
not the same
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‘Structural Adequacy’
Ability of a specimen to resist vertical loads, applied
in a standard furnace test
e.g.,30/30/30
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Commonly involves lateral forcesnot by test but by design
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Designing for Stability
in accordance with
NZBC B1/VM1
During and After fire
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Designing for Stability
Of boundary fire walls
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FRR based on ‘Time Equivalence’ or ‘S’ rating
based on FLED and constant ventilation conditions FRR rounded (up) in C/AS documents
Post-fire stability required on assumption of
building collapse significantly increased ventilation much lower FRR
High FRR - compartment integrityStability - compartment failure
FRR of Boundary Fire Wall
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Post-Fire
NZBC B1/VM1
‘After the fire until the building is either repaired or
demolished’
??
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Post-Fire Stability
Many questions remain, such as;
• What are we trying to achieve?• What elements require post-fire stability?• Are the B1/VM1 provisions workable?• Do we have the FRR right? • One way or two-way?
MBIE Work Group
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MEFE Thesis – Daniel JessopFire Performance of a Laterally Loaded LTF Structure
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Horizontal furnace testISO 834 standard time-temperature curve
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30.5 mins – Run-away deflection in fire-rated wall, furnace shut-off
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30.5 minutes Run-away deflection in fire-rated wallfurnace shut-down
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C/AS1NZS3604
NZBC Compliance
B1 – Structure C 1-6 Protection from Fire
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Thanks for Listening !
In short;
• ‘Stability’ vs ‘Structural Adequacy’• ‘Post-Fire’• B1/VM1 provisions• Required FRRs for Boundary Walls• Testing LTF structure (MEFE Project - Daniel Jessop)