What Is Kinematic vs. Inertial Interaction?
SSI's two (the mechanisms' — the ASCE 7 19's): the kinematic (the wave's — the scattering; the foundation's — the averaging) alters (the motion's — the input; the FIM's), while the inertial (the mass' — the shaking; the structure's) drives (the rocking — the swaying; the springs'). The kinematic's — the input modified; the inertial's — the response driven.
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Kinematic interaction
The averaging (the base-slab's — the waves'; the reduced), the embedment (the 70%'s — the reduction; the 19.2's), the scattering (the waves' — the foundation's; the incoherence), the FIM (the input's — the modified; the spectra's), and the piles' (the bending's — the curvature's; the 2x's — the cap's).
Inertial interaction
The rocking (the foundation's — the moment's; the uplift's), the swaying (the base shear's — the translation's; the springs'), the period (the lengthened — the T-tilde's; the 1.1-1.5x's), the damping (the radiation's — the 5-20%'s; the increased), and the springs (the impedance's — the Gazetas'; the 6-DOF's).
In practice
The 19's (the ASCE 7's — the chapter; the procedure's), the base shear (the reduced — the 0.7-1.0x's; the inertial's), the FIM (the spectra's — the kinematic's; the applied), the piles' (the kinematic's — the designed; the 2x's — the moment), and the conservatism (the fixed's — the 0.7's; the floor's). The two's — the SSI's halves.
The bottom line
Separate SSI into kinematic (wave averaging/embedment → FIM spectra per ASCE 7 19.2; design piles for 2x curvature moments) and inertial (rocking/swaying on impedance springs → 1.1-1.5x period, 0.7-1.0x base shear).
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