Overview
ISO/TR 12471:2004 - "Computational structural fire design" - is a Technical Report that reviews advances in modelling how structural materials and systems respond to fire. It summarizes analytical methods that combine heat transfer and mechanical models to predict structural behaviour from single elements up to whole frames under both standard furnace conditions and realistic compartment fires. The report also reviews fire tests used to determine required material input data and identifies areas needing further research and development, including the use of probabilistic (risk‑based) approaches to structural fire engineering.
Key topics
- Matrix of design approaches: thermal exposure models (H1 - standard/nominal curves; H2 - simulated real fires) and structural models (S1 - element; S2 - substructure; S3 - complete structure).
- Standard fire curves and alternatives: standard (ISO) furnace curve, hydrocarbon and external fire curves; parametric fire models used in codes.
- Thermal material properties and transient temperature calculation methods (heat transfer models).
- Mechanical material properties at elevated temperature and models for structural behaviour under fire loading.
- Integration of thermal and mechanical analyses to compute fire resistance by calculation rather than only by test.
- Uncertainty quantification, predictive model capabilities, and the use of probabilistic analysis (reliability-based design) for risk-informed decisions.
- Identification of gaps in fire tests and material data required for confident analytical design (e.g., thermal conductivity, specific heat, charring, strength degradation).
Practical applications
- Analytical determination of fire resistance as an alternative to standard fire resistance testing.
- Performance-based structural fire design for buildings using simulated compartment fires and parametric curves.
- Development and validation of structural fire engineering software (heat transfer + mechanical solvers).
- Informing test programs and laboratory work to generate input material data for high-temperature behaviour of steel, concrete and timber.
- Supporting code development, national regulations and implementation of reliability-based safety formats.
Who should use it
- Structural and fire safety engineers performing performance-based fire design.
- Researchers and material testing laboratories developing input data and validating models.
- Software developers of fire-structure simulation tools.
- Standards bodies and regulators drafting or revising fire design codes and guidelines.
Related standards and references
- ISO 834 (standard fire resistance test) and national standard fire test methods.
- Eurocode parametric fire approaches (referenced in the report) and other national guidance on performance-based structural fire design.
Keywords: ISO/TR 12471:2004, computational structural fire design, structural fire engineering, fire tests, probabilistic analysis, thermal material properties, mechanical material properties.