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- W3016401402 abstract "Under in-service conditions, unbonded post-tensioned concrete beams tend to be cracked. Concrete cracking leads to a change in the inertia of cross sections along the beam span. To obtain the exact and objective stiffness of the cracked beams, a method for assessing the stiffness is proposed based on the actual cracking pattern. Firstly, the region affected by the cracks is identified according to the crack locations; then key sections in the region are selected and their nonlinear strain distributions are modeled based on the crack depths. Internal force equilibria are adopted to find a solution to the top strain and neutral axis. Based on the solution, the lengthening of the unbonded tendons is calculated by using an iterative algorithm, and the inertias of the key sections are calculated to assess the beam stiffness. The proposed method has been validated experimentally using a simply supported beam and four two-span continuous beams, and all calculated deflections of these beams provide good agreements with experimental data. The proposed method has been shown to properly simulate the change in the inertias, assess the beam stiffness, and reflect the dependence of the stiffness on the cracking pattern." @default.
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- W3016401402 date "2020-07-01" @default.
- W3016401402 modified "2023-10-15" @default.
- W3016401402 title "Stiffness assessment of cracked post-tensioned concrete beams with unbonded tendons based on the cracking pattern" @default.
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- W3016401402 doi "https://doi.org/10.1016/j.engstruct.2020.110599" @default.
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