Title:
The Challenge of the End Span
Author(s):
Bijan O. Aalami
Publication:
Concrete International
Volume:
40
Issue:
10
Appears on pages(s):
35-37
Keywords:
load, member, parabola, design
DOI:
10.14359/51711172
Date:
10/1/2018
Abstract:
To avoid creating a moment at the anchorage, tendons are typically anchored at the centroid of the member. This results in a uniform compression in the member, which is added to the stresses from the bending of the member to complete the design. Anchoring the tendon at the member centroid leads to a challenge in the selection of the tendon profile for the end span of multi-span slabs and beams. The article provides a preferred tendon profile and example calculations.
Related References:
1. Lin, T.Y., “Load-Balancing Method for Design and Analysis of Prestressed Concrete Structures,” ACI Journal Proceedings, V. 60, No. 6, June 1963, pp. 719-742.
2. “PTI TAB,1-06: Post-Tensioning Manual,” sixth edition, Post-Tensioning Institute, Farmington Hills, MI, 2006, 354 pp.
3. Nawy, E.G., Prestressed Concrete, a Fundamental Approach, third edition, Prentice Hall, Upper Saddle River, NJ, 1999, 938 pp.