Behaviour of precast concrete beam-column sub-assemblages subject to column removal

Under column removal scenarios, initiation of alternate load paths via adjacent bridging beams to redistribute vertical loads requires certain level of ductility and continuity in beam–column joints. Although this approach does not consider the magnitude of the blast event, it is threat-independent...

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Main Authors: Kang, Shao-Bo, Tan, Kang Hai
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2015
Subjects:
Online Access:https://hdl.handle.net/10356/107316
http://hdl.handle.net/10220/25346
http://dx.doi.org/10.1016/j.engstruct.2015.03.027
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1073162019-12-06T22:28:45Z Behaviour of precast concrete beam-column sub-assemblages subject to column removal Kang, Shao-Bo Tan, Kang Hai School of Civil and Environmental Engineering DRNTU::Engineering::Civil engineering::Structures and design Under column removal scenarios, initiation of alternate load paths via adjacent bridging beams to redistribute vertical loads requires certain level of ductility and continuity in beam–column joints. Although this approach does not consider the magnitude of the blast event, it is threat-independent and offers a minimum level of robustness against column removal scenarios. This paper studies the behaviour of precast concrete sub-assemblages which comprised two precast beams and a precast column joining together by cast-in-place concrete topping above the two beams and the beam–column joint. The top longitudinal reinforcement in the structural topping of precast beams passed through the beam–column joint continuously. However, the bottom beam longitudinal reinforcement was either lap-spliced or anchored as a 90° bend within the cast-in-place joint. Due to discontinuity of bottom beam longitudinal reinforcement, the ability of such an assemblage to develop compressive arch action (CAA) and subsequent catenary action has to be investigated, in particular, the effect of the top and bottom beam longitudinal reinforcement ratios. Test results show that significant CAA and catenary action developed in the beams under column removal scenarios, with pull-out failure of the bottom beam reinforcement in the joint. The enhancement of CAA and catenary action to structural resistance greatly depends on joint detailing and beam reinforcement ratio. Furthermore, the effectiveness of horizontal shear transfer between concretes cast at different times is examined at large deformation stage. Finally, practical suggestions are given to enhance structural resistance of a similar type of precast concrete sub-assemblages. Accepted version 2015-04-10T02:25:27Z 2019-12-06T22:28:45Z 2015-04-10T02:25:27Z 2019-12-06T22:28:45Z 2015 2015 Journal Article Kang, S.-B. & Tan, K. H. (2015). Behaviour of precast concrete beam–column sub-assemblages subject to column removal. Engineering structures, 93, 85-96. https://hdl.handle.net/10356/107316 http://hdl.handle.net/10220/25346 http://dx.doi.org/10.1016/j.engstruct.2015.03.027 184510 en Engineering structures © 2015 Elsevier Ltd. This is the author created version of a work that has been peer reviewed and accepted for publication by Engineering Structures, Elsevier Ltd. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/ 10.1016/j.engstruct.2015.03.027]. 27 p. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Engineering::Civil engineering::Structures and design
spellingShingle DRNTU::Engineering::Civil engineering::Structures and design
Kang, Shao-Bo
Tan, Kang Hai
Behaviour of precast concrete beam-column sub-assemblages subject to column removal
description Under column removal scenarios, initiation of alternate load paths via adjacent bridging beams to redistribute vertical loads requires certain level of ductility and continuity in beam–column joints. Although this approach does not consider the magnitude of the blast event, it is threat-independent and offers a minimum level of robustness against column removal scenarios. This paper studies the behaviour of precast concrete sub-assemblages which comprised two precast beams and a precast column joining together by cast-in-place concrete topping above the two beams and the beam–column joint. The top longitudinal reinforcement in the structural topping of precast beams passed through the beam–column joint continuously. However, the bottom beam longitudinal reinforcement was either lap-spliced or anchored as a 90° bend within the cast-in-place joint. Due to discontinuity of bottom beam longitudinal reinforcement, the ability of such an assemblage to develop compressive arch action (CAA) and subsequent catenary action has to be investigated, in particular, the effect of the top and bottom beam longitudinal reinforcement ratios. Test results show that significant CAA and catenary action developed in the beams under column removal scenarios, with pull-out failure of the bottom beam reinforcement in the joint. The enhancement of CAA and catenary action to structural resistance greatly depends on joint detailing and beam reinforcement ratio. Furthermore, the effectiveness of horizontal shear transfer between concretes cast at different times is examined at large deformation stage. Finally, practical suggestions are given to enhance structural resistance of a similar type of precast concrete sub-assemblages.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Kang, Shao-Bo
Tan, Kang Hai
format Article
author Kang, Shao-Bo
Tan, Kang Hai
author_sort Kang, Shao-Bo
title Behaviour of precast concrete beam-column sub-assemblages subject to column removal
title_short Behaviour of precast concrete beam-column sub-assemblages subject to column removal
title_full Behaviour of precast concrete beam-column sub-assemblages subject to column removal
title_fullStr Behaviour of precast concrete beam-column sub-assemblages subject to column removal
title_full_unstemmed Behaviour of precast concrete beam-column sub-assemblages subject to column removal
title_sort behaviour of precast concrete beam-column sub-assemblages subject to column removal
publishDate 2015
url https://hdl.handle.net/10356/107316
http://hdl.handle.net/10220/25346
http://dx.doi.org/10.1016/j.engstruct.2015.03.027
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