ÖNORM EN 1994-1-2 - Fire Design

This Part 1-2 of EN 1994 deals with the design of composite steel and concrete structures for the accidental situation of fire exposure and is intended to be used in conjunction with EN 1994-1-1 and EN 1991-1-2. This Part 1-2 only identifies differences from, or supplements to, normal temperature design.

This Part 1-2 of EN 1994 deals only with passive methods of fire protection. Active methods are not covered. EN 1994-1-2 applies to composite steel and concrete structures that are required to fulfil certain functions when exposed to fire, in terms of avoiding premature collapse of the structure (load bearing function) and limiting fire spread (flame, hot gases, excessive heat) beyond designated areas (separating function).

This standard gives principles and application rules for designing structures for specified requirements in respect of the aforementioned functions and the levels of performance. It applies to structures, or parts of structures, that are within the scope of EN 1994-1-1 and are designed accordingly. However, no rules are given for composite elements which include prestressed concrete parts.

For all composite cross-sections longitudinal shear connection between steel and concrete should be assured according to EN 1994-1-1 or by tests (see also 4.3.4.1(3) and Annex G).

  • typical examples of concrete slabs with profiled steel sheets with or without reinforcing bars are given (trapezoidal profile, re-entrant profile, flat profile).
  • appropriate, reinforcing bars may be replaced by other steel sections like half sections, core sections etc.

The fire resistance of these types of constructions may be increased by applying fire protection materials.

The methods given in this Part 1-2 of EN 1994 are applicable to structural steel grades S235, S275, S355, S420 and S460 of EN 10025, EN 10210-1 and EN 10219-1. For profiled steel sheeting, reference is made to section 3.5 of EN 1994-1-1. Reinforcing bars should be in accordance with EN 10080.

Normal weight concrete, as defined in EN 1994-1-1, is applicable to the fire design of composite structures. The use of light weight concrete is permitted for composite slabs which may be connected or not to the steel beam below. This part of EN 1994 does not cover the design of composite structures with concrete strength classes lower than C20/25 and LC20/25 and higher than C60/75 and LC60/75.

Information on Concrete Strength Classes > C60/75 is given in section 6 of EN 1992-1-2. The use of these concrete strength classes may be specified in the National Annex.

For materials not included herein, reference should be made to relevant CEN product standards or European Technical Approval (ETA).

Current Document

ÖNORM EN 1994-1-2
EUROCODE 4 - Design of composite steel and concrete structures - Part 1-2: General rules - Structural fire design (consolidated version)

Current status:

ÖNORM

Publication:

2009-03-15

Document superseded:

Edition 2007-02-01

Further Information & Order:

ÖNORM EN 1994-1-2

National Annex

ÖNORM B 1994-1-2
EUROCODE 4: Design of composite steel and concrete structures - Part 1-2: General rules - Structural fire design - National specifications concerning ÖNORM EN 1994-1-2 and national comments

Current status:

ÖNORM

Publication:

2007-02-01

Document superseded:

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National Specifications:

Overview

Further Informaion & Order:

ÖNORM B 1994-1-2