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Fire Analysis of Steel Structures according to Eurocodes

Standard Fire Resistance calculation to EN 1991-1-2, EN 1993-1-2. Includes worked examples.
By the end of the course you will be able to calculate standard fire resistance of steel structural elements

Fire resistance of building structure« means the ability of the structure exposed to fire the appropriate time maintaining its strength. To recognize the precise value of the duration in which the construction retains its capacity, is crucial for fire-resistant design. Fire analysis calculation takes into account the actual technical state of construction material exposed to thermal impact or fire load and provide you with the critical temperature, e.g. the temperature to which the structure maintains its capacity or advice you of the optimal fire protection of the structural elements.

Why must we learn Fire Analysis?

Because we do not want that we have fire protection, which is oversized and as well uneconomical. On the other hand we do not want that the construction is in fire risk and does not allow a safe evacuation, as well as fire extinguishing and rescue.

Course Structure

In this course, I will present a thorough overview of structural fire analysis according to nominal temperature-time curves according to Eurocodes.

We will learn the following topics:
– What is thermal action?
– How to calculate temperature of protected and unprotected steel sections
– How to create load combinations for the fire limit states
– How to calculate fire resistance of structural members and their critical temperature
– Fire protection systems for steel structures

All chapters will also provide you with worked examples which will cover theoretical part presented. At the end you will be presented a calculation of critical temperature and required fire protection for typical structural elements of real structure.

I will provide you with an easy-to-follow material explanation, each section is clearly demonstrated in the presentation and covered with worked examples.

Introduction

1
Fire Analysis Course Introduction

Impact of Fire on Structure

1
Thermal Action

In this lesson we will learn what is thermal action and how we consider the fire action on the structure. It will be clearly described what kind of nominal temperature-time curves are covered in Eurocodes and how they can be applied to structure.

2
Heat Transfer Mechanisms

In this lesson we will learn how is the heat from fire compartment transferred to the structural element. We will learn three important topics here:

  • Section factor
  • Temperature of unprotected steel sections
  • Temperature of protected steel sections
3
Section Factor

In this lesson we will learn what is the section factor and why it is so important to know it for the evaluation of the speed of heating up. We will see how it differs in unprotected and protected cross sections.

4
Temperature of Unprotected Steel Sections

In this lesson we will learn how to calculate the increase in temperature in unprotected steel element according to Eurocodes. Numerical procedure for this calculation will be clearly presented, including detailed description of all parameters and worked example.

5
Temperature of Protected Steel Sections

In this lesson we will learn how to calculate the increase in temperature in protected steel element according to Eurocodes. Numerical procedure for this calculation will be clearly presented, including detailed description of all parameters and their limitations. Additionally worked example will be calculated.

Structural Fire Design Fundamentals

1
Load Combinations

In this lesson we will learn how to define fire load combination and which safety factors can be used for particular load case. We will learn general rule and simplified rule for calculating effects of actions for fire load combination. Additionally worked example will be presented.

2
Introduction to Mechanical Analysis

In this lesson we will learn fire analysis using strength and temperature domain. Reduction factors for yield strength and Young's modulus at elevated temperature will be described in detail.

3
Classification of Cross Sections

In this lesson we will repeat cross section classification from designing steel structures at room temperature and describe what is different in cross section classification at elevated temperature. Additionally worked examples will be presented for all four classes of cross sections.

Structural Fire Design in Strength Domain

1
Tension Members

In this lesson we will learn the calculation of the design resistance of the tension member at elevated temperature. Additionally worked example will be calculated.

2
Compression Members

In this lesson we will learn the calculation of the design resistance of the compression member with classes 1,2,3 at elevated temperature. Additionally worked example will be calculated.

3
Shear Members

In this lesson we will learn the calculation of the design shear resistance of a member with classes 1,2,3 at elevated temperature. Additionally worked example will be calculated.

4
Bending Members

In this lesson we will learn the calculation of the design moment resistance of a member with classes 1,2,3 at elevated temperature. Non-uniform temperature distribution will be explained too. Additionally worked example will be calculated.

5
Combined Bending and Shear

In this lesson we will learn the calculation of the reduced design moment resistance of a member with classes 1,2,3 at elevated temperature for combined bending and shear acting together . Non-uniform temperature distribution will be explained too. Additionally worked example will be calculated.

6
Combined Bending and Axial Force

In this lesson we will learn the calculation of the reduced design moment resistance of a member with classes 1,2,3 at elevated temperature for combined bending and axial force acting together. Additionally worked example will be calculated.

7
Critical Moment for LTB

In this lesson we will learn the calculation of the critical moment for lateral torsional for uniform symetrical cross sections. Additionally worked example will be calculated.

8
Lateral Torsional Buckling

In this lesson we will learn the calculation of the design lateral torsional buckling moment resistance of a member with classes 1,2,3 at elevated temperature. Additionally worked example will be calculated.

9
Combined Bending and Axial Compression

In this lesson we will learn the calculation of the design resistance for members with classes 1,2,3 subjected to combined bending and axial compression at elevated temperature. Additionally worked example will be calculated.

10
Members with Class 4 Cross Sections

In this lesson we will learn the calculation of the design resistance for members with class 4 at elevated temperature. Additionally worked example will be calculated.

Structural Fire Design in Temperature Domain

1
Critical Temperature Calculation

In this lesson we will learn the calculation of critical temperature for tension and bending elements. Additionally worked example will be calculated.

2
Iterative Procedure at Critical Temperature Caluclation

In this lesson we will learn the calculation of critical temperature when iterative procedure is required. Additionally worked example will be calculated.

Fire Protection of Steel Structures

1
Fire Protection Systems

In this lesson we will learn when fire protection is needed and which systems can be used for fire protection. We will learn also how to consider moisture in insulation.

2
Calculation of Fire Protection

In this lesson we will learn how to calculate fire protection and which parameters should be taken very carefully to get accurate results

Worked Examples & Conclusions

1
Structure Definition

In this lesson we will present the structure definition, actions on structure and description of typical structural elements which will be checked in fire analysis.

2
Main Beams

In this lesson we will calculate critical temperature and actual temperature for main beams. We will calculate also fire protection as critical temperature is reached very early and just unprotected steel section does not provide required fire resistance.

3
Secondary Beams

In this lesson we will calculate critical temperature and actual temperature for secondary beams. We will calculate also fire protection as critical temperature is reached very early and just unprotected steel section does not provide required fire resistance.

4
Columns

In this lesson we will calculate critical temperature and actual temperature for columns. As actual temperature is less than critical temperature after 30 minutes, no fire protection is needed.

5
Analysis of Results - Conclusions

In this lesson we will analyse the results of calculation. We will compare the results of fire analysis with default value of critical temperature which is usually used in many countries without knowing the exact value of the critical temperature for typical structural elements. Finally we will learn why it is so important to know the exact value of the critical temperature for optimal and safe fire design.

In Closing

1
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