Performance of practical beam-to-SHS column connections against progressive collapse

Wang, W, Fang, C, Qin, X, Chen, Y and Li, L 2016, 'Performance of practical beam-to-SHS column connections against progressive collapse', Engineering Structures, vol. 106, pp. 332-347.


Document type: Journal Article
Collection: Journal Articles

Title Performance of practical beam-to-SHS column connections against progressive collapse
Author(s) Wang, W
Fang, C
Qin, X
Chen, Y
Li, L
Year 2016
Journal name Engineering Structures
Volume number 106
Start page 332
End page 347
Total pages 16
Publisher Pergamom Press
Abstract This paper comprehensively discussed the performance of practical beam-to-SHS column connections against progressive collapse. Three full scale tests were performed on double-span systems subjected to the typical column loss scenario, where three connection types were covered in the test programme, namely, welded flange-weld web connection with internal diaphragms (specimen I-W), welded flange-bolted web connection with internal diaphragms (specimen I-WB), and welded flange-bolted web connection with short through diaphragms (specimen ST-WB). The test results, including failure modes/sequence, load-deformation responses and stress conditions, were presented in detail, and the load transfer mechanism over the entire loading process was thoroughly discussed. Comprehensive finite element (FE) models were then established to enable further discussion of the test results. Both experimental and FE results showed satisfactory ductility supply and load resistance of the three specimens, although specimen ST-WB exhibited the lowest ductility against initial fracture due to evident non-symmetrical stress distribution over the width of the beam flange. For the post-peak response, specimens I-WB and ST-WB showed reasonable regaining of the resisting load at later catenary stage due to a sufficient redistribution of the stress at the bolted shear tab connections, but limited post-peak load resistance was shown for specimen I-W which underwent quick propagation of the crack over the entire beam section. A simplified energy balance analysis showed that when a sudden column loss scenario is considered, progressive collapse may be triggered upon the initial fracture of the bottom beam flange of all the specimens.
Subject Structural Engineering
Keyword(s) Beam-to-SHS column connections
Ductility
Progressive collapse
Robustness
Square hollow sections (SHSs)
DOI - identifier 10.1016/j.engstruct.2015.10.040
Copyright notice © 2015 Elsevier Ltd. All rights reserved.
ISSN 0141-0296
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