Flexural stresses after cracking in partially prestressed beams

Flexural stresses after cracking in partially prestressed beams Arthur H. Nilson Professor of Structural Engineering Cornell University Ithaca, New York A method is presented to calculate elastic flexural stresses in partially prestressed concrete beams, in which cracking can be expected at service load. The effect of mild steel used to supplement the in such construction, ca the analysis. reinforcement, often main prestressing steel i easily be included in A numerical example is given to demonstrate the proposed method. E arly in the development of prestressed concrete, the goal of prestressing was the complete elimination of concrete tensile stress at service loads. The concept was that of an en- tirely new, homogeneous material which would remain untracked and re- spond elastically up to the maximum anticipated loading. This kind of design, where the limit- ing tensile stress in the concrete at full service load is zero, is generally known as full prestressing, while an alternative approach, in which a certain amount of tensile stress is permitted in the concrete at full service load, is called par- tial prestressing. Abeles, l Thurlimann, 2 Leonhardt,3

Flexural stresses after cracking in partially prestressed beams

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