期刊
ENGINEERING STRUCTURES
卷 266, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.engstruct.2022.114634
关键词
Concrete filled steel tubes (CFST); K-joints; Finite element modelling (FEM); Simplified equivalent modelling; Steel studs
资金
- National Natural Science Foundation of China [51778148, 51508103, 52078136]
- Recruitment Program of Global Experts Foundation [TM2012-27]
- Open Project of Fujian Provincial Key Laboratory on Multi -Disasters Prevention and Mitigation in Civil Engineering [MPMC-2022-4]
This paper investigates the structural performances of CFST K-joints with and without steel studs, and proposes a predictive tool based on the Finite Element Method (FEM). By discussing the key parameters and calibrating the FE models, reliable predictions of the load-displacement/strain response and strength of CFST K-joints can be achieved.
Concrete Filled Steel Tubular (CFST) K-joints employed for truss structures gained high interest in the last years due to their widespread use in engineering practice. The overall performances of these joints can be efficiently improved by using steel studs welded in the inner surface of the steel chord filled with the concrete, avoiding punching shear failure, and improving the overall strength and ductility. However, a reliable prediction of the structural behavior of the joints is outmost of importance for the assessment of the capacity of new and existing structures, and there are no standardized design methods nowadays. In this paper, the structural performances of CFST K-joints with and without steel studs are investigated by Finite Element Modelling (FEM) approach with the aim to provide a predictive tool for the design. A comprehensive discussion of the key parameters that govern the FEM procedure as well as the calibration of the FE models was provided to give the basis for a reliable modelling of CFST K-joints with and without studs for the predictions of the load-displacement/strain response and the strength, considering the main failure mechanisms. In this context, in addition to the detailed FEM of CFST K-joints with steel studs, a simplified equivalent FEM approach is proposed to reduce computational effort keeping the same accuracy.
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