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Structural Engineering and Mechanics Volume 41, Number 4, February25 2012 , pages 441-458 DOI: https://doi.org/10.12989/sem.2012.41.4.441 |
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Nonlinear shear strength of pre-stressed concrete beams |
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Alireza Rahai and A. Shokoohfar
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| Abstract | ||
| The shear strength is an important factor in the design of prestressed concrete beams. Therefore, researchers have utilized various methods to determine the shear strength of these elements for the design purposes. To evaluate some of the proposed theoretical methods, numerous models of posttensioned beams with or without vertical prestressing are selected and analyzed using the finite element method and assuming nonlinear behavior for the materials. In this regard the validity of modeling is evaluated based on some tests results. In the second part of the study two beam specimens are built and tested and their load-deformation curve and cracking pattern are studied. The analytical results consist of compressive strut slope and mid span load deflection are compared with some experimental results, and the results of some codes\' formulas. Finally comparing the results of nonlinear analysis with the experimental values, a new formula is proposed for determining strut slopes in prestressed concrete beams. | ||
| Key Words | ||
| shear strength; prestressed concrete; vertical prestressing; strut slope; crack pattern; testing; truss models | ||
| Address | ||
| Alireza Rahai and A. Shokoohfar: Department of Civil Engineering, Amir Kabir University of Technology, Tehran 1591634311, Iran | ||