Title:
Shear Strength ofPrestressed Concrete Beams With Unbonded Tendons
Author(s):
K. Kordina, J. Hegger, and M. Teutsch
Publication:
Structural Journal
Volume:
86
Issue:
2
Appears on pages(s):
143-149
Keywords:
beams (supports); prestressed concrete; reinforced concrete; shear strength; tests; unbonded prestressing; web reinforcement; Structural Research
DOI:
10.14359/2635
Date:
3/1/1989
Abstract:
Describes results of shear tests on 10 prestressed concrete beams with unbonded tendons. The purpose of the tests was to elucidate the effect of the bond condition upon the load-bearing behavior in shear. Evaluation of test results and comparison with various shear-design models show that the shear strength of prestressed beams with unbonded tendons can be determined correctly with a truss model. Conversely, a tied-arch model is found to achieve inadequate agreement with the experimentally determined shear strength. For beams with bonded longitudinal reinforcement, depending on the degree of web reinforcement, two failure modes--tension or flexural shear failure and web-crushing--must be distinguished. For both failure modes, the design regulations for prestressing with bonded tendons can be used.