Scaled Model Tests and Numerical Analyses on Nonlinear Dynamic Response of Soft Grounds

Mechanical Behavior of Anisotropic Sand Ground Beneath Structures Subjected to Cyclic Loading Such as Wave Loading

“…The applicability of the similarity law in the 1 gˆeld has been described by Kagawa (1978), Kokusho and Iwatate (1979) and Iai (1989). In their research, the physical modeling for the 1 g model testing was proposed under a certain limited condition, and its validity was recognized.…”

A Consideration on the Equivalent Linearization of Restoring Force Cearacterisitics of Structures

“…Jacobsen27 proposes to adopt "Work Area Under Skelton "as potential energy recognizing that there is an ambiguity about its definition. Kokusho et al 28 clarify nonlinear response behaviors of a model sand layer excited on a shaking table and simulate the experimental results with seismic response analysis applying dynamic constants of sand obtained by above equivalent linearization technique in soils and show that calculated acceleration responses to the excitation of recorded accelerograms agree considerably well with observed responses in both peak amplitudes and phases but the discrepancy appears remarkably in the smaller parts. On the other hand Tani et al 29' examine numerically seismic response behaviors of one-degree-of-freedom system with various sorts of multi-linear hysteresis loops and point out that there exists an influence of configuration of slip type in hysteresis loop on the calculated responses.…”

Applicability of Principle of Superposition in Obtaining Horizontal Impedance Functions of Pile Groups Under Soil Non-Linearity

“…Early procedures are derived by Rocha [6] and Roscoe [7], who discuss scaling relations between model and prototype in terms of stress and strain. Additional work was carried out by Kagawa [8], Kokusho and Iwatate [9], in generalizing the theory to more general conditions. For the present investigation, scaling laws derived by Kokusho and Iwatate [9] under one-g testing environment are employed.…”

“…Additional work was carried out by Kagawa [8], Kokusho and Iwatate [9], in generalizing the theory to more general conditions. For the present investigation, scaling laws derived by Kokusho and Iwatate [9] under one-g testing environment are employed. Table 1 summarizes the scaling relationship used in the present study where  is the geometric scaling ratio of the model to the prototype and  is the density scaling ratio of the model to the prototype.…”