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Title |
Column Shortening of SRC Columns Considering the Differential Moisture Distribution
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Authors |
설현철 ; 김윤용 ; 권승희 ; 김한수 ; 김진근 |
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Keywords |
SRC 기둥 ; 수분확산 ; 건조수축 ; 건조크리프 ; 부등수분분포 |
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Abstract |
Steel reinforced concrete(SRC) columns, which have been widely employed in high-rise buildings, exhibit a time-dependent behavior because of creep and shrinkage of concrete. This long-tenn behavior may cause a serious serviceability problem in structural systems, so it is very important to predict the deformation due to creep and shrinkage of concrete. However, it was found from the previous experimental studies that the long-tenn defonnation of SRC columns was quite dissimilar from that of RC columns. A new method is required to quantitatively predict the long-term defonnation of SRC columns. In this study, the causes of the discrepancy between the behaviors of RC and SRC columns are investigated and discussed. SRC columns exhibit a time-dependent relative humidity distribution in a cross section differently from that of reinforced concrete(RC) columns owingto the presence of a inner steel plate, which interferes wvith the moisture diffusion of concrete. This relative humidity distribution may reduce the drying shrinkage and the drying creep in comparison with RC columns. Therefore it is suggested that the differential moisture distribution should be taken into account in order to reasonably predict column shortening of SRC columns.
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