Finite element modelling and numerical investigation of multi-planar concrete-filled steel tubular KK joints

CHEN Juan; ZHOU Chengye

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Finite element modelling and numerical investigation of multi-planar concrete-filled steel tubular KK joints

CHEN Juan 1 *,ZHOU Chengye 2

1.Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, 210016

2. Department of Civil Engineering, Tsinghua University, 100084

*Correspondence author

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Funding: Specialized Research Fund for the Doctoral Program of Higher Education（No.20133218120009）, National Natural Science Foundation of China （No.No.51408308）, Open Research Fund Program of State key Laboratory of Hydroscience and Engineering（No.No.sklhse-2016-C-04）, NUAA Fundamental Research Fund （No.No.NS2014001）

Opened online:27 April 2017

Accepted by: none

Citation: CHEN Juan,ZHOU Chengye.Finite element modelling and numerical investigation of multi-planar concrete-filled steel tubular KK joints[OL]. [27 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4726520

With the development of large span and heavy load modern engineering, concrete-filled steel tubular structures appear constantly. The joints of these structures are mostly multi-planar joints. In order to solve the problem of lacking of the investigation of multi-planar concrete-filled steel tubular (CFST) joints, the mechanical behaviour of CFST KK joints were studied through refined finite element simulation. Accurate finite element models of CFST KK joints were established by considering the material nonlinearity, the geometry nonlinearity, and the contact nonlinearity between the tube and the concrete. The spatial effect of multi-planar joints was be obtained by comparing with uni-planar joints. The FEM results showed that, the multi-planar carry-over effects had the maximum effect for the 60o CFST joints, the strength of multi-planar joints decreased compared with the planar joints, and the stiffness of them did not vary substantially. While for the 90o CFST joints, both the strength and stiffness of multi-planar joints did not vary substantially with the planar joints. This research can provide scientific basis for the design of multi-planar CFST joints, and effectively promote the application of CFST structures.

Keywords:steel-concrete composite structure; tubular joint;multi-planar joints; failure mode;refined finite element simulation

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