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http://dx.doi.org/10.12989/sem.2021.78.4.485

Collapse resistance of steel frames in two-side-column-removal scenario: Analytical method and design approach  

Zhang, JingZhou (Department of Building and Real Estate, The Hong Kong Polytechnic University)
Yam, Michael C.H. (Department of Building and Real Estate, The Hong Kong Polytechnic University)
Soltanieh, Ghazaleh (The Chinese National Engineering Research Center (CNERC))
Feng, Ran (School of Civil and Environmental Engineering, Harbin Institute of Technology)
Publication Information
Structural Engineering and Mechanics / v.78, no.4, 2021 , pp. 485-496 More about this Journal
Abstract
So far analytical methods on collapse assessment of three-dimensional (3-D) steel frames have mainly focused on a single-column-removal scenario. However, the collapse of the Federal Building in the US due to car bomb explosion indicated that the loss of multiple columns may occur in the real structures, wherein the structures are more vulnerable to collapse. Meanwhile, the General Services Administration (GSA) in the US suggested that the removal of side columns of the structure has a great possibility to cause collapse. Therefore, this paper analytically deals with the robustness of 3-D steel frames in a two-side-column-removal (TSCR) scenario. Analytical method is first proposed to determine the collapse resistance of the frame during this column-removal procedure. The reliability of the analytical method is verified by the finite element results. Moreover, a design-based methodology is proposed to quickly assess the robustness of the frame due to a TSCR scenario. It is found the analytical method can reasonably predict the resistance-displacement relationship of the frame in the TSCR scenario, with an error generally less than 10%. The parametric numerical analyses suggest that the slab thickness mainly affects the plastic bearing capacity of the frame. The rebar diameter mainly affects the capacity of the frame at large displacement. However, the steel beam section height affects both the plastic and ultimate bearing capacity of the frame. A case study on a six-storey steel frame shows that the design-based methodology provides a conservative prediction on the robustness of the frame.
Keywords
multi-column-removal; robustness; assessment; analytical method; design approach;
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