Environmental Engineering Reference
In-Depth Information
From this we get the following unit differential moment at the circular ring beam:
h R
2 X 2
r u
r R ¼ 0
2
:
20
2 0
2
:
675
D
m R0 ¼
X 1
:
2160
:
1005
2
:
25
¼ð 0
:
2376 0
:
1005 Þ 1
:
189 ¼ 0
:
402 MNm
=
m
Only approx. 10% of the twisting moment acting is carried by the lower tower shell,
whereas approx. 60% remains in the circular ring beam and the remaining 30% is
carried by way of an eccentric shear force.
In this example the circular ring beam fulfils the stiffening function required.
The characteristic values of the internal forces in the circular ring beam (N Rk ,M Rk ,
V Rk ,T Rk ) and the bending action effects in the adjoining shaft areas below (X 1k ,X 2k )
are also calculated separately for symmetrical (permanent) and antisymmetrical (wind)
action effects (Figure 4.49).
Fig. 4.49 Calculation of the internal forces in a circular ring beam as a result of the actions at an
abrupt change in diameter
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