Journal
INTERNATIONAL JOURNAL OF CONCRETE STRUCTURES AND MATERIALS
Volume 11, Issue 1, Pages 1-16Publisher
SPRINGER
DOI: 10.1007/s40069-016-0171-6
Keywords
balanced ratio; carbon-fiber-reinforced polymer; modeling; prestressed concrete; unbonded
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Funding
- Chung-Ang University Research Scholarship
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The compression or tension-controlled failure mode of concrete beams prestressed with unbonded FRP tendons is governed by the relative amount of prestressing tendon to the balanced one. Explicit assessment to determine the balanced reinforcement ratio of a beam with unbonded tendons (p(pfb)(U)) is difficult because it requires a priori knowledge of the deformed beam geometry in order to evaluate the unbonded tendon strain. In this study, a theoretical evaluation of p(pfb)(U) is presented based on a concept of three equivalent rectangular curvature blocks for simply supported concrete beams internally prestressed with unbonded carbon-fiber-reinforced polymer (CFRP) tendons. The equivalent curvature blocks were iteratively refined to closely simulate beam rotations at the supports, mid-span beam deflection, and member-dependent strain of the unbonded tendon at the ultimate state. The model was verified by comparing its predictions with the test results. Parametric studies were performed to examine the effects of various parameters on p(pfb)(U).
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