A STUDY FOR SEISMIC IMPROVEMENT OF CONCRETE FRAME WITH PERFORATED WALLS

Abstract

The Japanese building standard act was revised in 1981 considered non-linearity. However, a
number of buildings built before 1981 are existing, seismic evaluations for those building have actively been
assessed based on the seismic evaluation standard published by The Japan Building Disaster Prevention
Association after especially 1995 Kobe Earthquake. In practical seismic evaluation works, it is relatively
simple and easy to make models of general buildings, but unconventional frames are complex such as a
staircase or a frame with different level girders. A perforated concrete wall is modeled as a shear wall, if the
opening ratio is 0.4 and less. On the other hand, one with more than the opening ratio of 0.4 is modeled as a
column with a wing wall. The modeling concept is simplified to smoothly assess the seismic performance of
a building even though it is not confirmed that the models is suited to their actual behavior. In this paper, FE
analyses were performed, and their results were examined. Finally, partially closing the openings down to an
opening ratio of at least 0.4 is recommended because seismic slits could fail to work well.