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Dynamic Stiffness Parameters for Turbine Foundation

Dynamic Stiffness Parameters for Turbine Foundation

Dynamic Stiffness Parameters for Turbine Foundation

(OP)
How do we calculate Dynamic Spring and Damping Constants for bedrock and soil, for the case given below.

Type of Structure : Steam Turbine Generator
Operation Speed : 3600 rpm
Foundation : Pedestal Type, 46'x106'x42'high
Existing Ground Elev. : 790.0'
Top of Rock Elev. : 786.0'
Footing bottom elev. : 778.0'
Shear wave velocity (soil): 211 m/sec
Shear wave velocity (rock): 1275 m/sec

VALUABLE GUIDANCE IS HIGHLY APPRECIATED. THANKS IN ADVANCE.

RE: Dynamic Stiffness Parameters for Turbine Foundation

sharathkumar,

Basically, it appears that your foundation will be on rock, so I don't see where the soil shear wave velocity even comes in to play.

Anyhow, you might want to post this in a structural or mechanical engineering forum to get a more focused and useful response.

Jeff

Jeffrey T. Donville, PE
TTL Associates, Inc.
www.ttlassoc.com

RE: Dynamic Stiffness Parameters for Turbine Foundation

There are several approaches:

1-use empirical equations and relations, along with CPT data.

2-Use in situ testing techniques, like SASW and MASW method to evaluate the damping of the soil. For the spring constant you can use the plate bearing method.

3-Collect samples and use Resonant column test to evaluate the G and or E and damping of the soil at different level. Using a numerical analysis with the measured values you can estimate the spring constants of the soil.

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