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built templatestructural-firewith-tool

Steel Critical Temp

Calculates steel critical temperature from an explicit fire design load ratio using the Eurocode-style relationship theta_cr = 39.19 ln(1/(0.9674 mu^3.833) - 1) + 482. The template reports the critical temperature, margin to a protection trigger, and a numeric protection requirement indicator.

inputs

2 fields

context

3 archetypes

engine

with-tool

outputs

3 scored fields

contract fields

Parameter Map

2 inputs to 3 scored outputs

  • load_ratio

    float

    Design load effect divided by ambient-temperature resistance

    0.05 to 0.95

  • protection_trigger_c

    float

    Critical temperature threshold below which fire protection is required

    350 to 650C
critical_temperature_ctol 0.03

Critical steel temperature

protection_margin_ctol 0.03

Critical temperature minus protection trigger temperature

protection_requiredtol 0.01

Numeric fire protection requirement indicator: 0 no, 1 yes

visibility contract

Difficulty Ladder

all_giveneasy

All parameters given for a low-utilisation member

all fields visible
all_givenmedium

All parameters given across low and moderate utilisation members

all fields visible
all_givenhard

All parameters given for moderate and high utilisation members

all fields visible

scenario bands

Archetype Atlas

low_utilisation_member

2 contexts

Low-utilisation steel member with reserve ambient capacity

load_ratio0.15 to 0.35
protection_trigger_c500 to 620

secondary-floor-beam / light-industrial-platform

moderate_utilisation_member

2 contexts

Moderately utilised steel member in a fire-rated zone

load_ratio0.35 to 0.65
protection_trigger_c500 to 620

commercial-frame-beam / plant-room-support-steel

high_utilisation_member

2 contexts

Highly utilised steel member with low reserve fire capacity

load_ratio0.65 to 0.9
protection_trigger_c450 to 600

transfer-girder / heavily-loaded-column

rendered task

Generation Preview

commercial-frame-beam-moderate-utilisation-member-preview

difficulty
hard
visibility
all_given
archetype
moderate_utilisation_member
site context
commercial-frame-beam
instruction excerptsteel-critical-temp_calc.py

visible fields

  • load_ratio0.35 to 0.65
  • protection_trigger_c500 to 620 C

withheld schema

critical_temperature_cprotection_margin_cprotection_required
Moderately utilised steel member in a fire-rated zone. commercial-frame-beam. Required outputs: critical_temperature_c, protection_margin_c, protection_required