Title:
Unbonded Post-Tensioning Tendons and Partially Prestressed Beams
Author(s):
P. R. Chakrabarti, Tai Ping Whang, Wade Brown, Kenan M. Arsad, and Edwardo Amezeua
Publication:
Structural Journal
Volume:
91
Issue:
5
Appears on pages(s):
616-625
Keywords:
beams (supports); ductility; high-strength concrete; prestressing; span-depth ratio; stresses; Structural Research
DOI:
10.14359/4183
Date:
9/1/1994
Abstract:
In this project, an attempt has been made to pursue an in-depth study of the behavior of post-tensioned beams with unbonded tendons. Four groups of beams were tested with the following variables taken into account: different mixes of reinforcing and prestressing steel, T-beams and rectangular beams, normal and high-strength concrete, low and high ratios (l/d), and different initial stresses in the tendons. This paper describes general precracking and post-cracking behavior observed in the testing of 33 beam specimens. Based on test observations and load-deflection plots, conclusions are made. A follow-up paper will contain specific items such as the calculation of ultimate design stress for unbonded tendons and a comparison between the measured stresses and those obtained using the present ACI code equations.