Seismic Soil-structure Interaction Analysis Research Articles

Foundation design considerations for a pile supported critical facility

A large reinforced concrete structure supported on piles extending to bedrock is evaluated using a seismic soil–structure interaction analysis. The physical structure, the supporting pile system, analysis model and analytical methodology used are described. Important considerations in the design of the foundation pile system using the seismic analysis loadings and deformations are discussed.

Seismic soil-structure interaction analysis by direct boundary element methods

Upon establishing the mathematical framework necessary for a proper understanding of the analytical theory, a regularized form of the conventional direct boundary integral equation formulation for three-dimensional elastodynamics is presented for a general anisotropic medium. Founded on the basis of a full decomposition of the Greens functions into regular and singular parts, the alternative boundary integral equation format is compact and without demand ingmathematical and numerical complexities such as Cauchy principal values. Extended to deal with general seismic soil-structure interaction problems in semi-infinite media, the formulation is implemented computationally together with a rigorous treatment of singular dynamic multi-layered viscoelastic half-space Greens functions and interfacial boundary tractions arising in typical soil-structure-foundation configurations. A set of new benchmark numerical results are included.

Soil–structure interaction in fuel handling building

This paper presents an accurate three-dimensional seismic soil–structure interaction analysis for large structures. The method is applied to the fuel building in nuclear power plants. The analysis is performed numerically in the frequency domain and the responses are obtained by inverse Fourier transformation. The size of the structure matrices is reduced by transforming the equation of motion to the modal coordinate system. The soil is simulated as a layered media on top of viscoelastic half space. Soil impedance matrices are calculated from the principles of continuum mechanics and account for soil stiffness and energy dissipation. Effects of embedment on the field equations is incorporated through the scattering matrices or by simply scaling the soil impedance. Finite element methods are used to discretize the concrete foundation for the generation of the soil interaction matrices. Decoupling of the sloshing water in the spent fuel pools and the free-standing spent fuel racks is simulated. The input seismic motions are defined by three artificial time history accelerations. These input motions are generated to match the ground design basis response spectra and the target power spectral density function. The methods described in this paper can handle arbitrary foundation layouts, allows for large structural models, and accurately represents the soil impedance. Time history acceleration responses were subsequently used to generate floor response spectra at applicable damping values.

Effect of seismic wave inclination on structural response : Tabatabaie, M; Abrahamson, N; Singh, J P Proc 3rd Conference on Dynamic Response of Structures, Los Angeles, March 31–April 2 1986P613–620. Publ New York: ASCE, 1986

A new procedure is developed using the computer program SASSI to evaluate the effects of inclined propagating shear waves on three-dimensional seismic soil-structure interaction (SSI) response. An example of an offshore gravity structure is used to illustrate the procedure. Using the recorded motions from the two-dimensional dense strong motion array in Taiwan (SMART-1), the angle of incidence of incoming shear waves is estimated at 20 degrees. SSI analyses are performed for the same input motion using vertical as well as inclined wave propagation. The results show an increase of up to 50 percent in the horizontal response of the structure using the inclined wave assumption as opposed to the vertically propagating wave assumption.

Unified approach to linear seismic soil-structure interaction analysis (In French) : Aubry, D Rev Fr GeotechN38, 1987, P5–24

Unified approach to linear seismic soil-structure interaction analysis (In French) : Aubry, D Rev Fr GeotechN38, 1987, P5–24