Loadbearing structures and detailed design - Concrete Structures for Wind Turbines - page 187

a) Symmetrical loads:

N R ; Gk ¼ D n R ; Gk r R

M R ; Gk ¼ m R ; Gk þ D

r R

m R ; Gk

V R ; Gk ¼ 0
T R ; Gk ¼ 0

b) Antisymmetrical loads:
N R ; QW ; k ¼ 0
M R ; QW ; k ¼ m R ; QW ; k þ D

r R b cos

m R ; QW ; k w

b sin

V R ; QW ; k ¼ v R ; QW ; k h R m R ; QW ; k þ D m R ; QW ; k w

r R

T R ; QW ; k ¼ m R ; QW ; k þ D m R ; QW ; k ð 1 b Þ sin w

where

E I B
E I B þ G I T

b ¼

4.10.5 Load on circular ring beam at ultimate limit state
The design values of the internal forces (N R,Ed ;M R,Ed ;V R,Ed ;T R,Ed ) are determined using
the same design load cases as for the deformation calculation (see Section 4.7.1). The
permanent loads for an unfavourable effect (

g G,unf ¼ 1.35) are critical for the resultant load:

a) External loading:
n R ; Ed ¼ 1

:

35 D

n R ; Gk

þ 1

m R ; Ed ¼ 1

:

35 m R ; Gk þ D

:

35 ð or 1

:

50 Þ m R ; QW ; k þ D m R ; Gk m R ; QW ; k

v R ; Ed ¼ 1 : 35 ð or 1 : 50 Þ v R ; QW ; k

b) Internal forces:
N R ; Ed ¼ 1

: 35 N R ; Gk

M R ; Ed ¼ 1 : 35 M R ; Gk þ 1 : 35 ð or 1 : 50 Þ M R ; QW ; k

V R ; Ed ¼ 1 : 35 ð or 1 : 50 Þ V R ; QW ; k

T R ; Ed ¼ 1 : 35 ð or 1 : 50 Þ T R ; QW ; k

c) Internal forces related to the layers of reinforcement:
N R ; Ed ¼ 1 35 N R ; Gk

M s1 ; Ed ¼ M R ; Ed N R ; Ed

:

z R ; 1 d R ; 1

M s2 ; Ed ¼ M R ; Ed þ N R ; Ed z R ; 2 d R ; 2