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Title: | Tendon stress evaluation of unbonded post-tensioned concrete segmental bridges with two-variable response surfaces |
Authors: | Halder, R Yuen, TYP Chen, W-W Zhou, X Deb, T Zhang, H Wen, T-H |
Keywords: | precast concrete segmental bridge;externally unbonded tendon;discrete finite element model;response surface methodology;prestress change |
Issue Date: | 17-Aug-2021 |
Publisher: | Elsevier |
Citation: | Halder, R. et al. (2021) 'Tendon stress evaluation of unbonded post-tensioned concrete segmental bridges with two-variable response surfaces', Engineering Structures, 245, 112984, pp. 1 - 15. doi: 10.1016/j.engstruct.2021.112984. |
Abstract: | This paper comprehensively studied the combined effects of prestress change and aspect ratios on the nonlinear structural performances of externally prestressed precast concrete segmental bridges (PCSB). An experimentally validated discrete-finite element model was adopted and various analytical cases were generated with variable span lengths. Furthermore, a simulation study is performed considering the change in prestress level to understand its effect on structural response, failure behaviour, and tendon stress at the ultimate limit state (ULS). The result showed that the stress in the unbonded tendon before the failure stage varies from 0.79 to 1.03fpy for the shorter tendon (T6L) and 0.66 to 0.94fpy for the longer tendon (T5L), and on comparing with the prediction of the existing codes, the stresses are highly underestimated. However, for the typical prestress level of around0.6 0.7fpu, the ACI318-19 code could quite well predict the ultimate tendon stress change. To establish the dependency of stress in the unbonded tendon at ULS to the normalized prestress factor (α) associated with the aspect ratio (L/d), the response surface methodology (RSM) was implemented. The mediocre prediction of one- variable linear regression analysis concludes the dependency of the combined effects of the two variables on the response variables. The 3rd order two-variable response surfaces were able to predict an increase in stress and total stress of tendon at the ULS with high goodness-of-fit values of 0.97 and 0.92 respectively. |
Description: | Referred to by: Corrigendum to “Tendon stress evaluation of unbonded post-tensioned concrete segmental bridges with two-variable response surfaces” [Eng. Struct. 245 (2021) 112984] Engineering Structures, Volume 247, 15 November 2021, Pages 113131 Rudhra Halder, Terry Y.P. Yuen, Wang-Wen Chen, Xiangming Zhou, Trissa Deb, Hexin Zhang, Tzu-Han Wen - https://www.sciencedirect.com/science/article/pii/S0141029621012657/pdfft?md5=246f2744618dd46c0ddcf4fe7d67a742&pid=1-s2.0-S0141029621012657-main.pdf |
URI: | https://bura.brunel.ac.uk/handle/2438/27018 |
DOI: | https://doi.org/10.1016/j.engstruct.2021.112984 |
ISSN: | 0141-0296 |
Other Identifiers: | ORCID iD: Xiangming Zhou https://orcid.org/0000-0001-7977-0718 112984 |
Appears in Collections: | Dept of Civil and Environmental Engineering Research Papers |
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File | Description | Size | Format | |
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FullText.pdf | Copyright © 2021 Elsevier. All rights reserved. This is the accepted manuscript version of an article which has been published in final form at https://doi.org/10.1016/j.engstruct.2021.112984, made available on this repository under a Creative Commons CC BY-NC-ND attribution licence (https://creativecommons.org/licenses/by-nc-nd/4.0/). | 5.3 MB | Adobe PDF | View/Open |
Corrigendum.pdf | 771.45 kB | Adobe PDF | View/Open |
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