Avoiding Disproportionate Collapse

Full Session with Abstracts

339808-3 - Progressive collapse of RC frames subjected to the column removal scenarios at the edge area

Friday, April 20
3:30 PM - 5:00 PM
Location: 202B

When framed columns in the edge area of a frame structure are damaged, severe progressive collapse (PC) may be triggered due to the insufficient lateral stiffness of the remaining structure. However, the research on this issue is still lacking. In this work, two planar one-story reinforced concrete (RC) frames were designed, in which the first and second inner columns adjacent to the structural edge column were removed, respectively. The static collapse test was conducted to analyze the effect of the lateral stiffness and span number on the behavior of the PC of RC frames. Experimental results showed that the final collapse mode of the frames was that the plastic damage formed at the beam ends and the bottom of columns, converting the statically indeterminate frames into two moving mechanisms. Under the compressive arch mechanism (CAM), the insufficient horizontal restraint of the columns on the beams and slabs leaded to a larger vertical displacement of the frames, which consequently reduced the contribution of the compressive forces within the beams and slabs to the collapse resistance of the frames. Under the catenary mechanism (CM), the collapse resistance of the frame was mainly determined by the lateral stiffness and strength of the columns. When they were insufficient, the collapse resistance of the frame under CM decreased or flatted with the increase of the vertical displacement. When the second inner column was removed, the development of the internal forces of the frame columns was uneven due to the influence of the mechanical behavior of the system. That resulted in the damage of the adjacent column in advance, which consequently transferred CAM into CM earlier and increased the axial forces of CM.

Yi Li

Associate Professor
Beijing University of Technology

He obtained his Ph.D. degree from Tsinghua University in 2011. From 2011 to 2015,he was an Assistant Professor in Beijing University of Technology. Since 2015, he has been an associate professor in Beijing University of Technology. He was in charge of four important research programs, including a General Research Program and a Youth Program funded by the National Natural Science Foundation of China; a sub-project of the National Key Research and Development Program funded by the Ministry of Science and Technology of China and a Beijing Scientific Nova Program funded by the Beijing Municipal Science and Technology Commission. To date, he has published a research monograph and more than 50 technical articles. His primary area of research focus is on progressive collapse prevention of concrete structures.

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339808-3 - Progressive collapse of RC frames subjected to the column removal scenarios at the edge area



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