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Title: A load-deformation formulation for CHS X- and K-joints in push-over analyses
Authors: Qian, X. 
Zhang, Y.
Choo, Y.S. 
Keywords: Circular hollow section
Joint formulation
Phenomenological representation
Pushover analysis
Tubular joint
Issue Date: 2013
Citation: Qian, X., Zhang, Y., Choo, Y.S. (2013). A load-deformation formulation for CHS X- and K-joints in push-over analyses. Journal of Constructional Steel Research 90 : 108-119. ScholarBank@NUS Repository.
Abstract: This paper proposes a new load-deformation formulation for circular hollow section (CHS) X- and K-joints to be implemented in the pushover analysis of steel frames. The proposed formulation describes the load-deformation relationship of the CHS X- and K-joint through a simple function with the coefficients dependent on the ultimate strength and the geometric parameters of the joint. The strength-dependent parameter follows the mean strength equations in the latest IIW recommendations, while the geometric-dependent parameters derive from the finite element results of the CHS X- and K-joints covering a practical geometric range. The proposed joint formulation predicts closely the load-deformation responses for planar CHS X- and K-joints measured in the experiments. The non-dimensional load-deformation formulation developed in the current study provides a calibrated basis in the phenomenological representation of the nonlinear joint behavior in push-over analyses of steel space frames. The experimental results from the large-scale 2-D and 3-D frame tests validate the accuracy of the proposed formulation, which is implemented in a nonlinear pushover analysis as joint-spring elements. © 2013 Elsevier Ltd.
Source Title: Journal of Constructional Steel Research
ISSN: 0143974X
DOI: 10.1016/j.jcsr.2013.07.024
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