Title:
Proposed Methodology for Computing of Unbonded Tendon Stress at Flexural Failure
Author(s):
Li-Hyung Lee, Jeong-Ho Moon, and Jae-Hyung Lim
Publication:
Structural Journal
Volume:
96
Issue:
6
Appears on pages(s):
1040-1048
Keywords:
flexural tests; prestressed concrete; prestressing steels (tendons).
DOI:
10.14359/781
Date:
11/1/1999
Abstract:
The present study is the first part of a theoretical and experimental research series on the unbonded tendon stress in prestressed concrete members. This paper describes a computational method of the unbonded tendon stress at the flexural failure of a member. First, the previous design equations were examined to find their advantages and disadvantages. Then, a new design equation was proposed with the consideration of the global compatibility requirement and the plastic hinge length. The proposed design equation was derived so that main parameters and their combination were obtained from theoretical study, and then the coefficients were determined by regression using previous test data. The previous experimental results were used to examine ACI and AASHTO LRFD code equations as well as the proposed equation. The proposed equation showed good agreement with previous test data.