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Advances in Concrete Construction
  Volume 9, Number 3, March 2020 , pages 289-299

Experimental study on long-term behavior of RC columns subjected to sustained eccentric load
Chang-Soo Kim, Yu Gong, Xin Zhang and Hyeon-Jong Hwang

    To investigate the long-term behavior of eccentrically loaded RC columns, which are more realistic in practice than concentrically loaded RC columns, long-term eccentric loading tests were conducted for 10 RC columns. Test parameters included concrete compressive strength, reinforcement ratio, bar yield strength, eccentricity ratio, slenderness ratio, and loading pattern. Test results showed that the strain and curvature of the columns increased with time, and concrete forces were gradually transferred to longitudinal bars due to the creep and shrinkage of concrete. The long-term behavior of the columns varied with the test parameters, and long-term effects were more pronounced in the case of using the lower strength concrete, lower strength steel, lower bar ratio, fewer loading-step, higher eccentricity ratio, and higher slenderness ratio. However, in all the columns, no longitudinal bars were yielded under service loads at the final measuring day. Meanwhile, the numerical analysis modeling using the ultimate creep coefficient and ultimate shrinkage strain measured from cylinder tests gave quite good predictions for the behavior of the columns.
Key Words
    reinforced concrete column; long-term behavior; eccentric loading test; creep and shrinkage; minimum reinforcement
Chang-Soo Kim: School of Architecture, Seoul National University of Science and Technology, 232 Gongreung-ro, Nowon-gu, Seoul 01811, Republic of Korea
Yu Gong, Xin Zhang: School of Civil Engineering, Shandong Jianzhu University, Shandong Provincial Key Laboratory of Appraisal and Retrofitting in Building Structures, Fengming Road, Lingang Development Zone, Jinan, Shandong, 250101, P.R. China
Hyeon-Jong Hwang: School of Architecture, Konkuk University, 120 Neungdong-ro, Seoul 05029, Republic of Korea

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