Abstract
Modeling the soil–structure interaction (SSI) in seismic design involves the use of soil response curves for single-degree-of-freedom (SDOF) structures; however, real structures have multiple degrees of freedom (MDOF). In this study, shaking-table-derived p-y curves for SDOF and MDOF superstructures were compared using numerical analysis. It was found that an MDOF structure experienced less displacement than an SDOF structure of the same weight, but the effect of increasing the DOF decreased at greater pile depths. Numerical analysis results estimated using the natural periods and mass participation rates of the structures were similar to those of shaking table tests. Abbreviations: finite element: FE; frequency response function: FRF; multiple degrees of freedom: MDOF; single degree of freedom: SDOF; soil–structure interaction: SSI.
Highlights
Soil–Structure Interaction in StructureIn the past 10 years, approximately 1500 earthquakes of magnitude 5 or greater and approximately 10 earthquakes of magnitude 7 or greater have occurred worldwide each year [1]
The behavior of the structures during the shaking table tests was measured using eight strain gauges attached to the pile and one linear variable differential transformer attached to the shaking table plate
Relative to the W/O structure case, the SDOF and multiple degrees of freedom (MDOF) structures increased the maximum bending moment generated in the pile by factors of approximately
Summary
In the past 10 years, approximately 1500 earthquakes of magnitude 5 or greater and approximately 10 earthquakes of magnitude 7 or greater have occurred worldwide each year [1]. Because the stiffness of soil decreases as the amplitude of the load increases, and because there are cases in which the inertia or attenuation of the ground that occurs under dynamic loading cannot be evaluated [9], dynamic loads such as earthquake loads cannot be reasonably considered in seismic design [10,11,12] To address this issue, studies attempting to develop a dynamic p-y curve for piles are currently underway. In this study we conducted shaking table model tests in which the structure was modeled first with no superstructure, and with SDOF and MDOF structures with the same weights to obtain the dynamic behavior of the pile in the presence or absence of a superstructure and, in the process, compare the SDOF and MDOF structure cases. The results of the shaking table test will improve our knowledge of the dynamic behavior of the real structures
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