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Post-buckling ductile fracture analysis of panel zones in welded steel beam-to-column connections
AbstractExperimental study on thin-walled welded steel beam-to-column connections under cyclic large plastic strain loading was conducted. Severe shear buckling in panel zones was observed during the testing. The connections have stable and excellent seismic performance, and finally failed due to the post-buckling ductile fracture. This paper aims to numerically simulate the post-buckling ductile cracking process using a proposed micro-mechanism based ductile fracture model, and further investigate critical factors, such as equivalent panel zone width-to-thickness ratio, axial load ratio and initial geometrical imperfection, that affect cracking behaviors of the connections. The cyclic ductile fracture model is verified with the experimental data, and employed to conduct the parametric analyses. Deterioration of stress-carrying capacity is also considered, so the fracture model can successfully simulate the load decrease in the load-displacement curves of the experimental results.
HighlightsThin-walled beam-to-column connections with weak panel zones investigatedPost-buckling ductile crack initiation and propagation of beam-to-column connections evaluated with acceptable accuracyStress state of the panel zone theoretically analyzedMicro-mechanism based ductile fracture model with both crack initiation and propagation rules employedEffects of key parameters on hysteretic and cracking behaviors investigated through parametric analyses
Post-buckling ductile fracture analysis of panel zones in welded steel beam-to-column connections
AbstractExperimental study on thin-walled welded steel beam-to-column connections under cyclic large plastic strain loading was conducted. Severe shear buckling in panel zones was observed during the testing. The connections have stable and excellent seismic performance, and finally failed due to the post-buckling ductile fracture. This paper aims to numerically simulate the post-buckling ductile cracking process using a proposed micro-mechanism based ductile fracture model, and further investigate critical factors, such as equivalent panel zone width-to-thickness ratio, axial load ratio and initial geometrical imperfection, that affect cracking behaviors of the connections. The cyclic ductile fracture model is verified with the experimental data, and employed to conduct the parametric analyses. Deterioration of stress-carrying capacity is also considered, so the fracture model can successfully simulate the load decrease in the load-displacement curves of the experimental results.
HighlightsThin-walled beam-to-column connections with weak panel zones investigatedPost-buckling ductile crack initiation and propagation of beam-to-column connections evaluated with acceptable accuracyStress state of the panel zone theoretically analyzedMicro-mechanism based ductile fracture model with both crack initiation and propagation rules employedEffects of key parameters on hysteretic and cracking behaviors investigated through parametric analyses
Post-buckling ductile fracture analysis of panel zones in welded steel beam-to-column connections
Chen, Yiyi (Autor:in) / Pan, Lingli (Autor:in) / Jia, Liang-Jiu (Autor:in)
Journal of Constructional Steel Research ; 132 ; 117-129
11.01.2017
13 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Post-buckling ductile fracture analysis of panel zones in welded steel beam-to-column connections
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Ductile steel beam-column moment connections
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Panel zone deformation of steel welded beam-to-column connections
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Performance of ductile steel beam-column moment connections
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