Investigation of seismic behavior of low-rise piloti structure according to seismic design and base isolation of columns

초록

The number of earthquakes in Korea is gradually increasing, and recent earthquakes in Gyeongju and Pohang caused serious damage to piloti structures, a common structural type in Korea. Therefore, this study evaluated the seismic safety of a piloti structure following seismic reinforcement of hoop rebar and the design of a column isolation device. The isolation device was designed at the bottom and also at the top of a column in consideration of repair and replacement. Eigenvalue analysis showed little difference in natural frequency according to the seismic design of hoop rebar but a reduction in the first natural frequency by approximately 15~21 % with the installation of the isolation device. The maximum displacement also decreased by approximately 20~22 % and the maximum stress by 43~73 %, depending on the position of the installed device. Compared with seismic reinforcement of the piloti structure with hoop rebar, the isolation device absorbed displacement induced by an earthquake within its allowable range, which results in simultaneously reducing structural displacement and the seismic load transmitted to the structure. © 2021 by Korea Concrete Institute.

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