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Title |
Experimental Study on the Torsional Performance Evaluation of Columns of RC Piloti Building under Combined Loads
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Authors |
권유진(U-Jin Kwon) ; 백종하(Jong-Ha Paik) ; 백은림(Eun-Rim Baek) ; 이상호(Sang-Ho Lee) |
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DOI |
https://doi.org/10.4334/JKCI.2024.36.2.123 |
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Keywords |
복합하중; 필로티; 철근콘크리트 기둥; 실험 연구; 비틀림성능평가 combined loads; piloti; RC columns; experimental study; torsional performance evaluation |
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Abstract |
The piloti building is a vertically irregular structure and is vulnerable to earthquake loads because the piloti story (weak story) lacks strength and stiffness compared to the upper floors. Moreover, if the centers of mass and stiffness are inconsistent due to the eccentric arrangement of cores in the piloti story, severe structural damage occurs due to stress concentration and torsional stress when an earthquake occurs. In particular, column of piloti story is subjected to experience axial force, shear force, bending moment, and torsional moment, and it is essential to understand the relationships between these loads, including the load-displacement behavior for each force. In this study, axial force, shear force, bending moment, and torsional moment were applied to the RC column of the piloti building with vertical and horizontal irregularities, and an experimental study was conducted to understand the structural performance. The experimental results showed that the maximum strength levels of the specimens with eccentricity distances of 0 mm and 150 mm were similar, but their ductilities were reduced. Furthermore, the specimen with a 300 mm eccentricity distance exhibited the maximum strength level at 50 % compared to the specimen without eccentricity. The specimen with axial load ratio of 0.24 showed about 10 % increase in maximum strength compared to the one with ratio of 0.12; however, after reaching the maximum strength, the load rapidly decreased, showing a brittle failure mode.
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