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Cross coupling impedance of embedded dynamic foundations per Gazetas 1991/ASCE Manual 136

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canwesteng

Structural
May 12, 2014
1,675
Formulas and Charts for Impedances of Surface and Embedded Foundations by Gazetas, as well as ASCE 136 Concrete Foundations for Turbine Generators, make reference to a "cross-coupling" impedance caused by lateral stiffness of the embedded side wall of the foundation also providing some resistance to rocking. For lateral translation, I get units of kip/ft, and for rotational translation, I get kip-ft/rad, but for this impedance I get kip/rad and it isn't clear how to apply this. Is anyone familiar with this? Past references I've used have ignored this, and I likely will as well due to the geometry of the foundation, but I would like to justify this by better understanding the impedance.
 
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