Application of welded unreinforced flange-welded web moment connection on box column

Cheng-Chih Chen*, Yue Shiun Tsai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Seismic behavior of beam-to-column connections used for steel special moment frame is studied. The connections studied are the type of welded unreinforced flange-welded web (WUF-W) moment connection. Characterized with thick beam flange, box column, and using the weld access hole recommended by AWS, the connections are intended to provide excellent ductile behavior. Two full-scale specimens were tested and the beam-to-column connection subassemblages were subjected to cyclic loading. Test results indicated that both specimens achieved 4% rad interstory drift angle, and the beams developed their plastic flexural strength. The failure of the specimens was the fracture of the beam flange caused by the cracking occurred at the beam flange complete joint penetration groove weld. Research results provide the practical application of the beam-to-column moment connection beyond the prequalified moment connection.

Original languageEnglish
Pages (from-to)212-216
Number of pages5
JournalTumu Gongcheng Xuebao/China Civil Engineering Journal
Issue numberSUPPL.2
StatePublished - 1 Aug 2012


  • Beam-to-column connection
  • Plastic hinge
  • Weld access hole

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