ÖNORM EN 1991-1-4|Wind actions

EN 1991-1-4 gives guidance on the determination of natural wind actions for the structural design of building and civil engineering works for each of the loaded areas under consideration. This includes the whole structure or parts of the structure or elements attached to the structure, e.g. components, cladding units and their fixings, safety and noise barriers.

This part is applicable to:

  • Buildings and civil engineering works with heights up to 200 m;
  • Bridges having no span greater than 200 m, provided that they satisfy the criteria for dynamic response.

This part is intended to predict characteristic wind actions on land-based structures, their components and appendages.

Certain aspects necessary to determine wind actions on a structure are dependent on the location and on the availability and quality of meteorological data, the type of terrain, etc. These need to be provided in the National Annex and Annex A. Should the National Annex to EN 1991-1-4, ÖNORM B 1991-1-4, not contain respective information, default values and methods are given in the main text, where the National Annex does not provide information.

Annex A gives illustrations of the terrain categories and provides rules for the effects of orthography including displacement height, roughness change, influence of landscape and influence of neighbouring structures.

Annexes B and C give alternative procedures for calculating the structural factor (dynamic factor times size factor). Annex D gives structural factors for different types of structures.

Annex E gives rules for vortex induced response and some guidance on other aeroelastic effects.

Annex F gives dynamic characteristics of structures with linear behaviour.

Guyed masts and lattice towers are treated in EN 1993-3-1 and lighting columns in EN 40.

EN 1991-1-4 does not give guidance on the following aspects:

  • local thermal effects on the characteristic wind (e.g. strong arctic thermal surface inversion or funnelling or tornadoes);
  • torsional vibrations, e.g. tall buildings with a central core;
  • bridge deck vibrations from transverse wind turbulence;
  • cable supported bridges;
  • vibrations where more than the fundamental mode needs to be considered.

Current document

ÖNORM EN 1991-1-4
EUROCODE 1 - Actions on structures - Part 1-4: General actions - Wind actions

Current status:

ÖNORM

Publication:

2005-11-01

Document superseded:

PRESTANDARD ÖNORM ENV 1991-2-4

Further Information & Order:

ÖNORM EN 1991-1-4

ÖNORM EN 1991-1-4
Eurocode 1: Actions on structures - Part 1-4: General actions - Wind actions (Amendment)

Current status:

DRAFT ÖNORM

Publication:

2009-10-15

Further Information & Order: 

DRAFT ÖNORM EN 1991-1-4

National Annex (German only)

ÖNORM B 1991-1-4
Eurocode 1 - Actions on structures - Part 1-4: General actions - Wind actions - National specifications concerning ÖNORM EN 1991-1-4 and national supplements

Current status:

ÖNORM

Publication:

2009-04-15

Document superseded:

Edition 2006-12-01

National Specifications:

Overview

More Information & Order:

ÖNORM B 1991-1-4

ÖNORM B 1991-1-4 Supplement 1
Eurocode 1 - Actions on structures - Part 1-4: General actions - Wind actions - Supplement 1: Examples of calculations

Current status:

ÖNORM

Publication:

2009-04-15

Document superseded:

Edition 2007-12-01

More Information & Order:

ÖNORM B 1991-1-4 Supplement 1

Technical information (German only)

Wie Windlasten auf Tragwerke wirken

Electronic Products

Austrian Quick Database - Meteorology and Geodynamics - Snow-, Wind-, Earthquake and Temperature actions