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Moment redistribution versus neutral axis depth in continuous PSC beams with external CFRP tendons

Moment redistribution versus neutral axis depth in continuous PSC beams with external CFRP tendons
Moment redistribution versus neutral axis depth in continuous PSC beams with external CFRP tendons
The neutral axis depth is adopted by many codes of practice as an indicator of flexural ductility to quantify moment redistribution in continuous prestressed concrete (PSC) beams. Moment redistribution, however, does not only depend on ductility but also on differences in stiffness along the length of the beam. Therefore, the effectiveness of using solely the neutral axis depth for redistribution quantification needs to be further evaluated. This study examines moment redistribution against neutral axis depth in two-span PSC beams with external CFRP tendons by applying a validated finite element model. The main variable is the content of non-prestressed reinforcement either at the positive or negative moment zone to generate varying stiffness differences between critical sections. The study shows that the use of neutral axis depth as a key parameter is inadequate when quantifying moment redistribution in these beams. Modifications of CSA, BSI and EC2 equations are proposed by introducing a parameter reflecting the impact of stiffness difference. The proposed equations show much better fit to the actual redistribution than that provided by equations in current design codes.
0141-0296
Lou, Tiejiong
2d99cbfa-37a0-49c3-a033-38e1dd580ab6
Sun, Wei
ab8e8179-f25d-4f51-95c3-8c009acf0c27
Karavasilis, Theodore
15850eb0-6af4-4b6e-bab4-d5bde281b769
Min, Di
4171bb56-a005-4cf5-8566-b0198ace1229
Pei, Chengming
f4a69652-28de-45a4-a9be-0bbcfe5e62bd
Lou, Tiejiong
2d99cbfa-37a0-49c3-a033-38e1dd580ab6
Sun, Wei
ab8e8179-f25d-4f51-95c3-8c009acf0c27
Karavasilis, Theodore
15850eb0-6af4-4b6e-bab4-d5bde281b769
Min, Di
4171bb56-a005-4cf5-8566-b0198ace1229
Pei, Chengming
f4a69652-28de-45a4-a9be-0bbcfe5e62bd

Lou, Tiejiong, Sun, Wei, Karavasilis, Theodore, Min, Di and Pei, Chengming (2019) Moment redistribution versus neutral axis depth in continuous PSC beams with external CFRP tendons. Engineering Structures, [109927]. (doi:10.1016/j.engstruct.2019.109927).

Record type: Article

Abstract

The neutral axis depth is adopted by many codes of practice as an indicator of flexural ductility to quantify moment redistribution in continuous prestressed concrete (PSC) beams. Moment redistribution, however, does not only depend on ductility but also on differences in stiffness along the length of the beam. Therefore, the effectiveness of using solely the neutral axis depth for redistribution quantification needs to be further evaluated. This study examines moment redistribution against neutral axis depth in two-span PSC beams with external CFRP tendons by applying a validated finite element model. The main variable is the content of non-prestressed reinforcement either at the positive or negative moment zone to generate varying stiffness differences between critical sections. The study shows that the use of neutral axis depth as a key parameter is inadequate when quantifying moment redistribution in these beams. Modifications of CSA, BSI and EC2 equations are proposed by introducing a parameter reflecting the impact of stiffness difference. The proposed equations show much better fit to the actual redistribution than that provided by equations in current design codes.

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EngStruct - Accepted Manuscript
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Accepted/In Press date: 12 November 2019
e-pub ahead of print date: 20 November 2019

Identifiers

Local EPrints ID: 437266
URI: http://eprints.soton.ac.uk/id/eprint/437266
ISSN: 0141-0296
PURE UUID: 49524c03-7786-4559-8bf5-4a7263847ad8
ORCID for Tiejiong Lou: ORCID iD orcid.org/0000-0001-9150-1203
ORCID for Theodore Karavasilis: ORCID iD orcid.org/0000-0003-2553-5389

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Date deposited: 23 Jan 2020 17:33
Last modified: 17 Mar 2024 05:11

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Contributors

Author: Tiejiong Lou ORCID iD
Author: Wei Sun
Author: Theodore Karavasilis ORCID iD
Author: Di Min
Author: Chengming Pei

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