EN Wind Code Options - CAESAR II - Help

CAESAR II Users Guide

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CAESAR II
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CAESAR II Version
13

Ref. Wind Velocity [Vb,0]

Specifies the fundamental value of the basic wind velocity of the area where the equipment is situated. Vb,0 is used along with C Dir and C Season to compute Vb.

Terrain Category

Select the appropriate terrain category from the table below. Category 0 generates the highest wind loads while category 4 produces the lowest wind loads.

Terrain Category

Description

0

Sea or Coastal area exposed to the open sea

1

Lakes or flat and horizontal areas with negligible vegetation and without obstacles

2

Area with low vegetation such as grass and isolated obstacles (trees, buildings) with separations of at least 20 obstacle heights

3

Area with regular cover of vegetation or buildings or with isolated obstacles with separations of maximum 20 obstacle heights (such as villages, suburban terrain, permanent forest)

4

Area in which at least 15% of the surface is covered with buildings and their average height exceeds 15 m

Directionality Factor [C Dir]

Value of the directional factor, C Dir, found in the National Annex. The recommended value is 1.0.

Season Factor [C Season]

Value of the season factor, C Season, found in the National Annex. The recommended value is 1.0.

Structural Factor [CsCd]

Structural factor used to determine the force on the vessel. This value is defined in Section of the EN 1991-1-4:2005(E) Wind load specification in Annex D. This value normally ranges between 0.90 and 1.10. The greater the structural factor value, the higher the element load.

Structure Damping Coefficient

Specifies the structural damping coefficient. This value is the percentage of critical damping and is used to calculate the gust factor for the wind load calculations.