Environmental Engineering Reference
In-Depth Information
Fig. 12.27
Reduction factors of TMD attached to the seismically excited onshore wind turbine
12.4.3.4 Onshore Reference Wind Turbine with Tuned Mass Damper
Considering Soil-Structure Interaction
In the following example, the SSI effects are presented for three different types of
soil: soft, medium hard, and hard soil. The foundation of the turbine was assumed
to be rigid and no embedment was considered. The soil properties are reported in
Table
12.8
, while the foundation properties are collected in Table
12.9
.
Table 12.8 Soil properties
Soil properties
Soft soil
Medium hard soil
Hard soil
Shear modulus G
S
in MN/m
2
3
120
5,000
Poisson's ratio t
S
0.35
0.30
0.25
Soil density q
S
in kg/m
3
1,600
1,900
3,000
Table 12.9 Foundation geometry and material properties
Foundation equivalent radius
r
F
= 11.30 m
q
F
= 2,500 kg/m
3
Density of the foundation material
Thickness of the foundation
d
F
= 2.50 m
Foundation mass
m
F
= 2507187.29 kg
H
u
= 81341512.88 kg m
2
Rocking mass moment of inertia
H
uz
= 160071372.35 kg m
2
Torsional mass moment of inertia
