sin αst

H
Tower analysis
The present appendix contains a verification of the structural integrity of the tower in
accordance with IEC 61400-2. The tower loads are found in appendix A.3 to be:
Load case Tower load
G
H
Table H.1: Tower loads
In both load cases the loads are ultimate and the tower components should thus meet the
following requirement:
Where
�design �
�design is the design stress from the load case
fk is the characteristic material strength
�m is the partial safety factor for the material
�f is the partial safety factor for the load
FT.tot � 13.9 kN
MT � 3.79 kN m
(H.1)
The tower is manufactured from steel S355, which has a characteristic ultimate strength of
510 MPa. The values of the partial safety factors are established in accordance with IEC
61400-2 under the assumption of so called full characterisation of the material properties
[5, p. 89]. This implies that factors such as environmental effects and manufacturing meth-
ods have been taken into consideration when determining the material properties. �m is set
to 1.1 and �f to 3.0. This results in the following ultimate limit state:
f k
� m � f
195