Engineering Fundamentals & Design Principles
Structural steel is inherently non-combustible (Euroclass A1 reaction to fire). Under elevated temperatures in structural fire scenarios, SerBuild calculates the reduction in yield strength (f_y,\theta) and elastic modulus (E_\theta) in accordance with Eurocode 3 Part 1-2 (EN 1993-1-2). We specify tested passive fire protection systems—including intumescent coatings, Promat calcium silicate boards, and Type F gypsum drywall—to achieve certified fire resistance ratings of REI 30, REI 60, REI 90, and REI 120.
Where \eta_fi = 0.65 is the fire design load reduction factor, k_y,\theta is the temperature-dependent reduction factor, and \gamma_{M,fi} = 1.0.
Applicable Design Standards & Codes
- Non-combustible primary steel frame achieving Euroclass A1 reaction to fire rating
- Structural fire engineering calculations per Eurocode 3 Part 1-2 (EN 1993-1-2)
- Intumescent coating specifications calibrated to critical steel design temperatures and section factors (Hp/A)
- Certified drywall board layering systems achieving REI 60 and REI 120 per EN 13501-2
Engineering Deliverables Provided
- Fire protection specification detailing dry film thickness (DFT) for intumescent paint
- Tested board layering schedules for load-bearing walls, floors, and structural columns
Fire Resistance Ratings & Passive Protection Matrix
Summary of governing standards, compliance thresholds, and engineering significance:
| Parameter / Check | Governing Standard | Specification / Value | Significance |
|---|---|---|---|
| Reaction to Fire Rating | EN 13501-1 | Euroclass A1 / A2-s1,d0 | Zero smoke production, zero flaming droplets, non-combustible frame. |
| Loadbearing Wall Resistance | EN 13501-2 / EN 1365-1 | REI 60 to REI 120 | Maintains structural loadbearing capacity, integrity, and insulation for up to 2 hours. |
| Intumescent Coating DFT | EN 13381-8 | Calibrated to critical temp \theta_{crit} = 550°C | Expanding thermal barrier protecting hot-rolled beams and columns. |
| Fire Compartment Walls | EN 13501-2 | EI 120 / REI-M 90 (Impact Resistant) | Prevents lateral fire spread between industrial and commercial tenancies. |
4-Stage Factory Quality Assurance Pipeline
Strict quality control gates from 3D BIM model validation to containerized dispatch:
Determining section factor (Hp/A or Am/V) for every primary steel profile.
Calculating critical design temperature (\theta_cr) based on load utilization ratio.
Specifying tested board layering schedules and intumescent micron thickness.
Measuring magnetic DFT of applied intumescent paint on site.
Request Sample Eurocode Dossier & 3D BIM Model
Receive complete structural calculation dossiers, FEA connection verifications, and sample IFC 3D models for municipal building permit evaluation.
Frequently Asked Technical & Engineering Questions
Direct answers from our senior structural engineering department:
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