原文传递
Experimental and Analytical Study of Seismic Behavior of Special-Shaped Multicell Composite Concrete-Filled Steel Tube Columns
| 题名： | Experimental and Analytical Study of Seismic Behavior of Special-Shaped Multicell Composite Concrete-Filled Steel Tube Columns |
| 正文语种： | 英文 |
| 作者： | Fei Yin, Ph.D.; Su-Duo Xue; Wan-Lin Cao; Hong-Ying Dong;Hai-Peng Wu |
| 作者单位： | Beijing Univ |
| 关键词： | Special-shaped concrete-filled steel tube (CFT) columns; Multicell; Seismic behavior; Constitutive relationship; Fiber-based method model; Numerical simulation |
| 摘要： | Special-shaped multicell composite concrete-filled steel tube (CFT) columns have been used in several super-high-rise buildings. However, research on special-shaped multicell CFT columns under low cyclic loading remains limited. Thus, seven 1/30-scaled specimens were designed for a low cyclic loading test. The parameters are four cross-section structures (i.e., the basic type, angle steel reinforced type, circular steel tube reinforced type, and simplified type) and three loading directions (i.e., the long axis, short axis, and 45°). The failure modes, hysteretic behavior, bearing capacity, ductility, and energy-dissipation capacity were analyzed. The results show that the angle steel and circular steel tube significantly increase the bearing capacity and energy dissipation. The circular steel tube has a better effect than the angle steel. The bearing capacity of the simplified-type specimens decreases but the ductility increases. When the loading direction changes from the long axis to the short axis, the ductility gradually increases, whereas the bearing capacity and energy-dissipation capacity gradually decrease. The optimized models of the fiber-based method (FBM) were proposed to predict the N-M curves and F-A curves. The concrete constitutive relationship in the multicell CFT was proposed based on the separation model by analyzing the features of multicell CFT columns and was used in the optimized fiber-based method. The numerical simulation models were established using Abaqus to simulate the F-A curves for FBM models and test. The calculation results show good consistency with the test. |
| 出版日期： | 2020 |
| 出版年： | 2020 |
| 期刊名称： | Journal of Structural Engineering |
| 卷： | Vol.146 |
| 期： | No.01 |
| 页码： | 04019170 |
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