A new model for analyzing nonlinear torsion behavior of concrete filled steel tube columns with rectangular section

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• 作者：Yuhang Wang ; Jianguo Nie ; Jiansheng Fan
• 刊名：Earthquake Engineering and Engineering Vibration
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：15
• 期：2
• 页码：269-282
• 全文大小：3,546 KB
• 刊物类别：Engineering
• 刊物主题：Vibration, Dynamical Systems and Control
  Chinese Library of Science
  
• 出版者：Institute of Engineering Mechanics (IEM), China Earthquake Administration
• ISSN：1993-503X
• 卷排序：15

文摘

An experimental study on concrete filled steel tube columns with rectangular section subjected to compressionflexure-torsion combined action has been carried out. The failure modes and load-deformation hysteretic relations were obtained. Based on the principles of classical material mechanics, the relations between the torsion curvature of the section and the shear strain of the fiber on the section were established. Then the strain distribution on the rectangular section of concrete filled steel tube columns subjected to torsion was analyzed. The three-dimensional refined finite element model was also built, in order to make the precision verification. The matrix forms of the relation between the torsion curvature of the section and the shear strain of the fiber on the section were derived, and introduced into the fiber beam model considering nonlinear torsion effect on the section. The comparison between test results and calculation results showed that the fiber beam model considering nonlinear torsion effect had high modeling efficiency and solution precision for predicting the torsion behavior of concrete filled steel tube columns with rectangular sections, and was suitable for analyzing the dynamic response of various structures subjected to the combined cyclic load caused by the earthquake load.Keywordsmechanical propertiesplastic deformationstrengthexperimental testingtorsion model