Comparison Studies on Structural Codes Focusing on Effects of Shear Walls –Case Study on the Philippines and Japan -

Abstract eng:
The authors have been working on comparison study on structural codes to grasp required levels of performance against earthquakes, and difference and characteristics of codes. Since seismic codes have complicated structures and comprise of various factors and formulas, they take an approach to compare actual structural designs for the same simple architectural designs based on the codes of the Philippines and Japan. Their previous study on structures without shear walls (momentresisting frames）entitled as “Comparison studies on structural codes focusing on story drift limit –Case study on the Philippines and Japan”, shows story drift limit in the Philippine code is strict especially for moment-resisting frames. Therefore engineers usually employ shear walls to rationally satisfy the story drift limit. This paper analyze the same design buildings with shear walls (dual system). The authors design rational designs of RC five-story apartment buildings with shear walls which meet the story drift limit of the codes of the two countries, and apply pushover analysis to both of the designs. The analysis shows shear walls work well both against shear forces and story drift. At the same time they find issues to be further discussed such as 1) evaluation of ductility in structural calculation (R factor in the Philippine code and Ds in the Japanese code), which is considerably different in the two codes, 2) behavior of “special boundary elements” stipulated in 421.8.6, and 3) comparison of modeling method of shear walls (FEM in the Philippines and equivalent linear members model in Japan). Finally the comparison study is summarized and recommendation on possible improvement of both codes and technical issues to be further discussed is presented.

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