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The serviceability limit state represented by the deflection control and cracking becomes important, especially for slender reinforced or prestressed fiber-reinforced-polymer (FRP) elements. Therefore, deflection under service loading conditions should be well-defined. No research has been conducted on the serviceability of rectangular concrete-filled FRP tube (CFFT) members with prestressing. This paper introduces a simplified method to calculate the short-term deflection of rectangular post-tensioned (PT) CFFT beams tested under four-point flexural loading. Based on a regression analysis of the experimental test results, a modified Branson’s effective moment of inertia (Ie) formula, which is employed by North American codes, is introduced to predict the (Ie) of rectangular PT CFFT beams at various loading stages. The proposed approach was found to be capable of predicting the moment-deflection response of the beams. The results show that the simplified approach yield conservative deflection estimates at the service load and equivalent load levels, with an average experimental-to-predicted deflection ratio of 1.21 ± 0.18 and 1.35 ± 0.19 and COVs of 15% and 14%, respectively.

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Serviceability Prediction of Post-tension Rectangular Concrete-Filled FRP Tubes (CFFT) Beams

  • 会议论文

  • 发表日期：

    2025年

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  • Asmaa Abdeldaim Ahmed,
  • Mamdouh El-Badry

摘要

The serviceability limit state represented by the deflection control and cracking becomes important, especially for slender reinforced or prestressed fiber-reinforced-polymer (FRP) elements. Therefore, deflection under service loading conditions should be well-defined. No research has been conducted on the serviceability of rectangular concrete-filled FRP tube (CFFT) members with prestressing. This paper introduces a simplified method to calculate the short-term deflection of rectangular post-tensioned (PT) CFFT beams tested under four-point flexural loading. Based on a regression analysis of the experimental test results, a modified Branson’s effective moment of inertia (Ie) formula, which is employed by North American codes, is introduced to predict the (Ie) of rectangular PT CFFT beams at various loading stages. The proposed approach was found to be capable of predicting the moment-deflection response of the beams. The results show that the simplified approach yield conservative deflection estimates at the service load and equivalent load levels, with an average experimental-to-predicted deflection ratio of 1.21 ± 0.18 and 1.35 ± 0.19 and COVs of 15% and 14%, respectively.