Experimental study on shrinkage of partially enclosed steel reinforced concrete columns

被引：0
|
作者：
Wu J. [1 ]
Wang Y. [1 ]
Yang Y. [2 ]
Dai B. [1 ]
机构：
[1] College of Civil Engineering, Tongji University, Shanghai
[2] College of Civil Engineering, Shanghai Normal University, Shanghai
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2019年 / 40卷
关键词：
Model test; Partially enclosed steel; Prediction model; Shrinkage; Steel reinforced concrete;
D O I：
10.14006/j.jzjgxb.2019.S1.023
中图分类号：
学科分类号：
摘要：
Partial enclosed steel reinforced concrete (PESRC) columns have been widely used in Shanghai Tower and other super high-rise buildings. Due to inhomogeneous humidity distribution inside columns caused by the steel's partially enclosing and opening, time-dependent behavior of PESRC columns is quite different from that of the steel reinforced concrete columns. Based on shrinkage experiment, this paper presented the evolution law of shrinkage strain for columns with different cross-section forms, including steel fully open, steel partially enclosed and steel fully enclosed sections. Furthermore, the existing shrinkage prediction models were modified based on the test results. The experimental results indicate that the shrinkage of test specimens with various steel forms is quite different from one another. The order from large to small of the shrinkage strain is plain concrete specimen, steel fully open specimen, steel partially enclosed specimen, and steel fully enclosed specimen, respectively. In addition, the experiment validated that deformation of steel reinforced concrete columns under drying conditions developed more rapidly than that under sealing conditions. The fundamental reason causing the different shrinkage strain of these specimen is that the humidity distribution is distinct from one another due to the steel hindrance to humidity. Finally, by modifying the shrinkage final value and the time development function of the B3 model, the modified prediction model for shrinkage matches the test data well and can provide references for the design of steel-concrete composite structures. © 2019, Editorial Office of Journal of Building Structures. All right reserved.
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页码：179 / 184
页数：5
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