Outline and Features of Japanese Seismic Design Code

Abstract eng:
The authors have been working on comparison study on seismic design codes of Japan and the Philippines to grasp required levels of performance against earthquakes, and the difference and characteristics of the codes. The Philippine seismic code (NSCP: National Structural Code of the Philippines 2010) is created referring to Uniform Building Code 1997 (UBC-1997). On the other hand the Japanese code is quite unique and unfamiliar to engineers outside of Japan as it was developed by Japanese engineers and researchers on their own research achievements. This paper explains the outline and features of the Japanese code in comparison with the Philippine code which may be familiar for many readers as UBC-1997 is applied in the United States and widely utilized in many countries. In this study the authors find that the basic idea, principles and components/items are basically common in the two codes. However there are several significant differences such as verification methods, evaluation of effects of ductility, and kinds of factors used in calculation of seismic loads. This paper reports the outline of the both codes and explain significant differences between them.

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