Abstract
This paper presents an application of strut-and-tie model (STM) to design the interior anchorage zone (IAZ) in the post-tensioned concrete structure. The STM theory and range of IAZ are introduced. Then, based on the finite element analysis, a series of simplified equations to calculate internal forces in IAZ are presented. Finally, the STM model for IAZ is given. In the proposed STM model, internal forces in ties vary with the dimension ratio and the eccentricity of load. The U-turn of internal forces is suggested to allocate rebar to resist bearing flexural tensile force. Compared with the FIP (International Federation for Prestressing) model, the proposed STM model is more reasonable and applicable.
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Abbreviations
- b :
-
Lateral dimension of anchor
- e :
-
Eccentricity of post-tensioned load
- F b :
-
Bursting force
- F c :
-
Internal force in strut
- F FT :
-
Flexural tensile force
- F t :
-
Tie force
- F TB :
-
Tie-back force
- h :
-
Lateral dimension of member
- h 1 :
-
Lateral dimension of Guyon’s symmetrical prism
- l :
-
Distance from right boundary of anchor to right boundary of member
- P :
-
Post-tensioned load
- σ 0 :
-
Average stress on the cross section of member
- σ1, σ2:
-
Longitudinal stress on left and right side of member
- σ b :
-
Bursting stress
- σ FT :
-
Flexural tensile stress
- σ t :
-
Tie stress
- σ TB :
-
Tie-back stress
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Foundation item: the National High Technology Research and Development Program (863) of China (No. 2006AA09A103) and the Shanghai Leading Academic Discipline Project (No. B208)
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Zhao, Jl., Shen, Sl. & Sun, Y. Application of strut-and-tie model for design of interior anchorage zone in post-tensioned concrete structure. J. Shanghai Jiaotong Univ. (Sci.) 15, 273–278 (2010). https://doi.org/10.1007/s12204-010-1002-6
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DOI: https://doi.org/10.1007/s12204-010-1002-6
Key words
- post-tensioned concrete structure
- interior anchorage zone (IAZ)
- strut-and-tie model (STM)
- internal forces
- simplified equations