Steel and Composite Structures

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Behavior of L-shaped double-skin composite walls under compression and biaxial bending

  • Qin, Ying (Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University) ;
  • Chen, Xin (School of Civil Engineering, Southeast University) ;
  • Xi, Wang (School of Civil Engineering, Southeast University) ;
  • Zhu, Xingyu (School of Civil Engineering, Southeast University) ;
  • Chen, Yuanze (School of Civil Engineering, Southeast University)
  • Received : 2020.06.10
  • Accepted : 2020.11.09
  • Published : 2020.11.25
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Abstract

The application of double-skin composite wall should meet different layout plans. However, most available research focused on the rectangular section with uniform axial compression. In this research, the structural behavior of double-skin composite wall with L section was studied. Due to the unsymmetric geometric characteristics, the considered loading condition combined the axial compression and biaxial bending. Five specimens were designed and tested under eccentric compression. The variables in the test included the width of the web wall, the truss spacing, the thickness of the steel faceplate, and the thickness of the web wall. The test results were discussed in terms of the load-displacement responses, buckling behavior, stiffness, ductility, strength utilization, strain distribution. Two modern codes were employed to predict the interaction between the axial compression and the biaxial bending. The method to calculate the available bending moment along the two directions was proposed. It was found that CECS 159:2004 offers more suitable results than AISC 360.

Keywords

Acknowledgement

This work is sponsored by the Natural Science Foundation of Jiangsu Province (Grant No. BK20170685), National Natural Science Foundation of China (Grant No. 52008091), and the National Key Research and Development Program of China (Grant No. 2017YFC0703802). The authors would like to thank the Zhejiang Southeast Space Frame Group Company Limited for the supply of test specimens, Jianhong Han in the steel research group for the help with test preparation, and Xiongliang Zhou, Weigang Chen, Yunfei He and Jianwei Ni for their assistance with the specimen fabrication.

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