Fire resistance check (esasd.05)

 

esasd.05

The esasd.05 module provides stress and stability verification of steel members under fire conditions. The checks can be performed both in the resistance and in the temperature-time domain.

Highlights
Full integration into the main graphical user interface.
Integrated library of insulations.
Applicable in combination with both first and second order calculations.
Clear and comprehensive report.

Supported codes:

  • EN 1993-1-2:2005,
  • SIA 263:2003,
  • NEN 6072:1991.

For a selected temperature curve, the temperature in the material after a required period is calculated. the material characteristics are adapted in function of the temperature. The fire check according also follows recommendations published in ECCS N°111.

Supported cross-sections

Fire resistance verification is supported for the following cross-sections:

  • Symmetric and asymmetric I-sections;
  • rectangular/circular hollow sections;
  • rectangular/circular solid sections;
  • single and double angles;
  • channels, U-, T-sections
  • composed steel welded sections;
  • sections with haunches, I-sections with variable height;
  • single plate cold-formed steel sections;
  • numerical sections with manually defined section properties;
  • built-in beams of types IFBA, IFBB, SFB and THQ.

Input data

The user selects:

  • the fire-curve to be used;
  • the time interval (resistance) for which the check should be carried out;
  • fire exposure pre section (all sides, three sides only);
  • type of fire protection material, if such is foreseen;
  • properties of the insulation, if user-defined.

These settings can also be defined separately per member. Temperature curves are built-in the software:

  • ISO 834 curve;
  • external fire curve;
  • hydrocarbon curve;
  • smouldering fire curve;
  • User-defined temperature curves may be defined and used in the analysis.

Built-in types of heat insulation include:

  • fibre boards, vermiculite/silicate/cement boards, gypsum boards;
  • mineral fibre;
  • vermiculite cement, perlite, gypsum sprays;
  • intumescent coatings.

Other editable properties include:

  • Net heat flux parameters, e.g. αc coefficient of heat transfer by convection, emissivity, etc.;
  • modifiable buckling lengths during fire;
  • fire resistance safety factors (values according to the EUROCODE, SIA and NEN are available by default);
  • general data related to LTB, diaphragms, shear buckling stiffeners.

Other advantages:

  • Customized fire resistance data can be defined per member in a structure - required fire resistance (R15, R30, R60), insulation properties, etc;
  • When calculating fire resistance, the user may opt to work with the whole structure, or rather with a selection of members. Furthermore, fire checks may be performed on demand separately from other unity checks. In this way, long calculation runs are avoided.

Analysis

  • Results from first-order or second-order calculations can be directly used for fire design;
  • Cross-section classification is performed specifically for fire situations;
  • Load combinations are generated automatically, based on the appropriate ψ combination factors;
  • Recommendations in the Model Code on Fire Engineering (ECCS N°111) are taken into account;
  • Depending on the calculated steel temperature, the E-modulus and allowable stresses are recalculated and then used in the performed analysis and fire resistance checks.
  • Up-to-date section factors Am/V and [Am/V]b and are provided for each supported cross-section in the library;
  • The critical steel temperature may be obtained from an iterative or non-iterative procedure. In case of an iterative procedure SCIA Engineer ensures that the critical temperature corresponds to a unity check result equal to 1.0. The non-iterative simplified procedure uses the initially calculated utilisation factor μ;
  • The programme automatically determines the critical load case/combination, critical members;
  • Both section and stability checks can are performed; stability checks include flexural, torsional and flexural-torsional buckling for columns, and torsional and lateral-torsional buckling for beams.

Results

  • Unity checks for stress and stability are shown directly on the 3D structure, represented by graphs on the members.
  • Colours are used to give a clear indication of any over-dimensioning or when resistance is exceeded;
  • Detailed check results can be displayed per member;
  • The preview window shows the part of the calculation report that is related to the performed checks and selected members.

Reporting

  • data is exported to the Engineering Report;
  • Free choice of output layouts: brief (a summary of section and stability checks), normal (extended summary), detailed (two pages per beam, displaying the results of all formulae used);
  • If desired, the calculation report will include a detailed list of all articles consulted from the standard.

Checks

For each of the design standards:

  • cross section classification;
  • section and stability checks.

EC3-1-2:

  • Cross-section classification according to art. 4.2.2;
  • Resistance of tension members: art. 4.2.3.1;
  • Resistance of class 1, 2 and 3 compression members: art. 4.2.3.2;
  • Resistance of class 1 and 2 beams: art. 4.2.3.3;
  • Resistance of class 3 beams: art.4.2.3.4;
  • Resistance of class 1, 2 and 3 members subject to bending and compression: art. 4.2.3.5.
  • Resistance of critical temperature: art. 4.2.4;
  • Resistance of check for class 4 members (Annex E).

NEN 6770/6771:

  • Cross-section classification according to art. 4.2.2;
  • Resistance of tension members: art. 4.2.3.1;
  • Resistance of compression members (class 1,2 or 3): art. 4.2.3.2;
  • Resistance of beams (class 1,2): art. 4.2.3.3;
  • Resistance of beams (class 3): art.4.2.3.4;
  • Resistance of members (class 1,2,3) subject to bending and compression: art. 4.2.3.5;
  • Critical temperature: art. 4.2.4.

SIA 263:2003

  • Classification of cross section: art. 4.8.5.2;
  • Resistance of tension members: art. 4.8.5.4;
  • Resistance of compression members (class 1, 2 or 3): art. 4.8.5.5;
  • Section and stability checks according to Chapter 4.8.5;
  • Resistance of beams (class 1, 2, 3): art.4.8.5.6., art. 4.8.5.7., art. 4.8.5.8;
  • Resistance of members (class 4): art. 4.8.5.9.

Supported cross-sections

  • Symmetric and asymmetric I-, L-, U-, T-sections;
  • circular and rectangular hollow sections;
  • circular and rectangular solid sections;
  • composed steel sections, sections with haunches or variable-height;
  • single-plate cold formed;
  • numerical sections determined by cross-section characteristics;
  • IFB, SFB and THQ integrated beams.

09/07/2014