Numerical Study on the Seismic Response of Structure with Consideration of the Behavior of Base Mat Uplift

Table 3

Soil impedance functions recommended in ASCE code [24].

Motion	Equivalent spring constant	Damping coefficient
Horizontal
Rocking
Vertical
Torsion

Note. , , and are soil Poisson ratio, shear modulus, and mass density and is the equivalent radius of structure base mat. , in which is the mass moment of inertia about the rocking axis at structure base mat and is structure polar mass moment of inertia.