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Behavior of Steel Moment Frames using Top-and-Seat Angle Connections under Various Column Removal Scenarios

Qian, K., Lan, X., Li, Z. & Fu, F. ORCID: 0000-0002-9176-8159 (2021). Behavior of Steel Moment Frames using Top-and-Seat Angle Connections under Various Column Removal Scenarios. Journal of Structural Engineering, 147(10), article number 04021144. doi: 10.1061/(asce)st.1943-541x.0003089


Top-and-seat angle connection is a conventional type of steel moment connection. However, its capacity in accommodating columns loss is rarely studied. In this study, five multi-story steel moment sub-frames using top-and-seat angle connection were fabricated and tested to investigate their performance subjected to various column removal scenarios including: (a) a middle column loss; (b) a penultimate column loss; and (c) a corner column loss. Moreover, the effects of the thickness of steel angle on load resistance were quantified. The test results indicated that load resisting capacity increased significantly with the increase of angle thickness. In both middle column and penultimate column removal scenarios, catenary action was developed in the frames. It is also noticed that, flexural action dominated the load resisting mechanism of the frames under a corner column loss scenario. For beams in different stories, similar flexural resistance was developed. However, the beams in the first story are able to develop larger catenary action than that in the second story. It worth noting that, for a corner column missing scenario, Vierendeel action helps to enhance the flexural action significantly.

Publication Type: Article
Additional Information: This material may be downloaded for personal use only. Any other use requires prior permission of the American Society of Civil Engineers. This material may be found at
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TH Building construction
Departments: School of Science & Technology > Engineering
SWORD Depositor:
[thumbnail of STENG-9699_R2-City deposit.pdf]
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