scholarly journals Time-dependent reliability analyses of prestressed concrete girders strengthened with CFRP laminates

2019 ◽  
Vol 196 ◽  
pp. 109297 ◽  
Author(s):  
D. Dias-da-Costa ◽  
L.A.C. Neves ◽  
S. Gomes ◽  
S.A. Hadigheh ◽  
P. Fernandes
Keyword(s):  
Prestressed Concrete ◽  
Time Dependent ◽  
Cfrp Laminates ◽  
Concrete Girders ◽  
Prestressed Concrete Girders

Time-Dependent Prestress Losses in Prestressed Concrete Girders Built of High-Performance Concrete

1997 ◽  
Vol 1594 (1) ◽  
pp. 64-72 ◽  
Author(s):  
M. Myint Lwin ◽  
Bijan Khaleghi
Keyword(s):  
Prestressed Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
Time Dependent ◽  
Step Method ◽  
Time Step ◽  
Prestress Losses ◽  
Concrete Girders ◽  
Prestressed Concrete Girders ◽  
Creep And Shrinkage

The Washington State Department of Transportation is one of several state departments of transportation involved in demonstration projects to acquire information and data on the design, fabrication, and construction of prestressed concrete bridges with high-performance concrete (HPC). Predicting the time-dependent prestress losses due to the creep and shrinkage of HPC and the relaxation of prestressing steel is difficult because of the limited experience with and data on the creep and shrinkage properties of HPC. The AASHTO load resistance factor design specification approach to estimating prestress losses is discussed, and the time-step method and the modified rate-of-creep method are introduced as ways of predicting more accurately the time-dependent prestress losses. A design example is used to compare and discuss numerically the prestress losses computed by the various methods. The modified rate-of-creep analysis method yields the lowest losses. The modified rate-of-creep method is a desirable, comprehensive, applicable, and practical method for estimating time-dependent prestress losses in composite and noncomposite prestressed concrete girders with HPC. This method is suitable for manual and electronic computation.

scholarly journals Partial Safety Factors for Prestressed Concrete Girders Strengthened with CFRP Laminates

2020 ◽  
Vol 24 (1) ◽  
pp. 04019060
Author(s):  
D. Dias-da-Costa ◽  
L. A. C. Neves ◽  
S. Gomes ◽  
R. Graça-e-Costa ◽  
S. A. Hadigheh ◽  
...  
Keyword(s):  
Prestressed Concrete ◽  
Safety Factors ◽  
Cfrp Laminates ◽  
Concrete Girders ◽  
Partial Safety Factors ◽  
Prestressed Concrete Girders

Proposed evaluation and repair procedures for precast, prestressed concrete girders with end-zone cracking

PCI Journal ◽  
2012 ◽  
Vol 57 (2) ◽  
pp. 94-119 ◽  
Author(s):  
Christie J. Hasenkamp ◽  
Sameh S. Badie ◽  
Kromel E. Hanna ◽  
Maher K. Tadros
Keyword(s):  
Prestressed Concrete ◽  
Concrete Girders ◽  
Prestressed Concrete Girders ◽  
Precast Prestressed Concrete
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