Abstract
This paper describes the design seismic coefficient (DSC) of the embedding foundation of building structures, which is required for the design of foundations such as basements and pile foundations. In the current Building Standard Law (BSL) of Japan, DSC is empirically specified as one-half of the base shear coefficient of a superstructure. However, the seismic design requirements in the BSL were revised in June 2000 to a performance-based design framework. A new seismic design method called the "response and limit strength calculation"(RLSC), which incorporates the effect of the soil-structure interaction, was developed. In the BSL revision, however, DSC is not referred to and must be evaluated by the conventional method mentioned above. Applying the numerical procedures employed in the development of RLSC, a practical evaluation method of DSC is investigated. A regressive formula is derived from the DSC and the ratio of the embedded depth to the foundation width.
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