Fire Analysis of Steel Structures according to Eurocodes

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.

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

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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

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.

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

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.

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.

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.

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.

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.