Effects of infilled wall opening on load resisting capacity of RC frames to mitigate progressive collapse risk

To quantify the load redistribution capacity of infill walls in reinforced concrete (RC) frames to resist progressive collapse, a series of five 1/4 scaled RC frames with or without infill walls were tested. The two-bay and three-story RC frames were tested using a pushdown loading regime. It was fo...

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Main Authors: Qian, Kai, Lan, Dong-Qiu, Fu, Feng, Li, Bing
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2022
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Online Access:https://hdl.handle.net/10356/154765
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1547652022-01-07T04:15:10Z Effects of infilled wall opening on load resisting capacity of RC frames to mitigate progressive collapse risk Qian, Kai Lan, Dong-Qiu Fu, Feng Li, Bing School of Civil and Environmental Engineering Engineering::Civil engineering Progressive Collapse Reinforced Concrete To quantify the load redistribution capacity of infill walls in reinforced concrete (RC) frames to resist progressive collapse, a series of five 1/4 scaled RC frames with or without infill walls were tested. The two-bay and three-story RC frames were tested using a pushdown loading regime. It was found that the infill walls could increase the first peak load by 256%. Even with an opening ratio of 31%, the infill walls could still increase the first peak load by 88%. This could be explained as the first peak load of infilled frames was attributed into equivalent struts of infill walls while the first peak load of bare frame mainly attributed in the flexural action of the beams. Beyond expectation, infill walls may not reduce the deformation capacity of the frames and secondary short struts of the infill walls could enhance the load resistance of the frame in large deformation stage. The opening ratio of 11%, 16%, and 31% could decrease the first peak load of the infilled frames with solid walls by 13%, 25%, and 47%, respectively. Moreover, the infilled walls with or without openings may change the position of rebar fracture of the beams. Thus, it was incorrect to simplify multi-story infilled frames into single-story substructures. The authors gratefully acknowledge the financial support provided by the Natural Science Foundation of China (Nos. 51778153, 51568004, 51478118). The high-level innovation team in colleges and universities and excellence scholar program in Guangxi (201738). 2022-01-07T04:15:10Z 2022-01-07T04:15:10Z 2020 Journal Article Qian, K., Lan, D., Fu, F. & Li, B. (2020). Effects of infilled wall opening on load resisting capacity of RC frames to mitigate progressive collapse risk. Engineering Structures, 223, 111196-. https://dx.doi.org/10.1016/j.engstruct.2020.111196 0141-0296 https://hdl.handle.net/10356/154765 10.1016/j.engstruct.2020.111196 2-s2.0-85088920553 223 111196 en Engineering Structures © 2020 Elsevier Ltd. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Civil engineering
Progressive Collapse
Reinforced Concrete
spellingShingle Engineering::Civil engineering
Progressive Collapse
Reinforced Concrete
Qian, Kai
Lan, Dong-Qiu
Fu, Feng
Li, Bing
Effects of infilled wall opening on load resisting capacity of RC frames to mitigate progressive collapse risk
description To quantify the load redistribution capacity of infill walls in reinforced concrete (RC) frames to resist progressive collapse, a series of five 1/4 scaled RC frames with or without infill walls were tested. The two-bay and three-story RC frames were tested using a pushdown loading regime. It was found that the infill walls could increase the first peak load by 256%. Even with an opening ratio of 31%, the infill walls could still increase the first peak load by 88%. This could be explained as the first peak load of infilled frames was attributed into equivalent struts of infill walls while the first peak load of bare frame mainly attributed in the flexural action of the beams. Beyond expectation, infill walls may not reduce the deformation capacity of the frames and secondary short struts of the infill walls could enhance the load resistance of the frame in large deformation stage. The opening ratio of 11%, 16%, and 31% could decrease the first peak load of the infilled frames with solid walls by 13%, 25%, and 47%, respectively. Moreover, the infilled walls with or without openings may change the position of rebar fracture of the beams. Thus, it was incorrect to simplify multi-story infilled frames into single-story substructures.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Qian, Kai
Lan, Dong-Qiu
Fu, Feng
Li, Bing
format Article
author Qian, Kai
Lan, Dong-Qiu
Fu, Feng
Li, Bing
author_sort Qian, Kai
title Effects of infilled wall opening on load resisting capacity of RC frames to mitigate progressive collapse risk
title_short Effects of infilled wall opening on load resisting capacity of RC frames to mitigate progressive collapse risk
title_full Effects of infilled wall opening on load resisting capacity of RC frames to mitigate progressive collapse risk
title_fullStr Effects of infilled wall opening on load resisting capacity of RC frames to mitigate progressive collapse risk
title_full_unstemmed Effects of infilled wall opening on load resisting capacity of RC frames to mitigate progressive collapse risk
title_sort effects of infilled wall opening on load resisting capacity of rc frames to mitigate progressive collapse risk
publishDate 2022
url https://hdl.handle.net/10356/154765
_version_ 1722355376926490624