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• W3195448698 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." @default.
• W3195448698 created "2021-08-30" @default.
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• W3195448698 date "2021-10-01" @default.
• W3195448698 modified "2023-10-17" @default.
• W3195448698 title "Tendon stress evaluation of unbonded post-tensioned concrete segmental bridges with two-variable response surfaces" @default.
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• W3195448698 doi "https://doi.org/10.1016/j.engstruct.2021.112984" @default.
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