Experimental study on seismic behavior of concrete filled steel tube columns under pure torsion and compression-torsion cyclic load
Experimental study on seismic behavior of concrete filled steel tube columns under pure torsion and compression-torsion cyclic load
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DOI：
10.1016/j.jcsr.2012.07.029
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发表时间：
2012-12-01
影响因子：
4.1
通讯作者：
Fan Jian-sheng
中科院分区：
文献类型：
--
作者：
Nie Jian-guo;Wang Yu-hang;Fan Jian-sheng
通过8根钢管混凝土柱在纯扭和压扭循环荷载作用下的拟静力试验，研究了不同截面形式、含钢率和轴压水平下钢管混凝土柱的抗扭性能。试验结果表明，钢管混凝土柱在纯扭和低周反复荷载作用下的滞回曲线都很丰满，表明钢管混凝土柱具有良好的抗震性能。钢管混凝土柱的卸载刚度等于其初始弹性刚度。钢管混凝土柱在较低的受压荷载作用下，其抗扭能力得到提高，延性也较好。但钢管混凝土柱的抗扭承载力会因较高的受压荷载而降低。钢管混凝土柱在纯扭作用下，在填充混凝土中产生螺旋斜压杆，填充混凝土斜压杆轴向力分量与钢管轴向拉力相等，以满足截面轴向荷载平衡条件，从而在钢管中产生轴向应变。钢管混凝土柱在纯扭和压扭复合作用下，截面的剪应变与截面转角之间具有良好的线性关系。根据试验结果和现有文献，对钢管混凝土柱的扭转机理进行了初步分析。皇冠版权所有（C）2012由爱思唯尔有限公司出版。保留所有权利。
Based on the quasi-static test on eight CFST columns subjected to pure torsion and compression-torsion cyclic load, the torsion behavior of CFST columns with various section types, steel ratios and axial load levels was studied. The test results showed that the hysteretic curves of CFST columns under pure torsion and low compression-torsion cyclic load are very plump, which indicate that CFST columns have good seismic capacity. The unloading stiffness of CFST columns was equal to the initial elastic stiffness. The torsion capacity of CFST columns could be improved by the low compressive load, and the ductility was also good. But the torsion capacity of CFST columns would be reduced by the high compressive load. When CFST columns subjected to pure torsion, spiral diagonal compressive struts will be created in the in-filled concrete, and the axial components of the diagonal compressive force of the in-filled concrete was equal to the axial tensile force of the steel tube in order to satisfy the axial load equilibrium condition on the section, so the axial strain will be produced in the steel tube. The shear strain has good linear relationship with the rotation angle of the section when CFST columns subjected to pure torsion and compression-torsion combined action. Based on the test results and literatures available, the torsion mechanism of CFST columns was preliminarily analyzed. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.