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Time-Dependent Behaviors of Prestressed Concrete Track Girders under Sustained Loads
Experimental and theoretical studies are conducted to investigate time-dependent behaviors of 4 concrete track girder models (1:5) in rail transit for 1800 days, with an emphasis on effects of types of concrete, stress differences between upper and lower fibers of midspan sections on time-dependent behaviors of prestressed concrete track girders. The test results show that the midspan deflections of the models increase continuously. And smaller time-dependent deflections at midspan are found in the models with HPC or a lower stress difference between the upper and lower fibers of the section at midspan. The theoretical formula based on age-adjusted effective modulus method is proposed to predict time-dependent deflections of prestressed concrete track girders due to creep and shrinkage of concrete and relaxation of prestressed tendons. The deflections at midspan predicted by the formula were compared to the measured values of the girders tested, with close agreement being observed.
Time-Dependent Behaviors of Prestressed Concrete Track Girders under Sustained Loads
Experimental and theoretical studies are conducted to investigate time-dependent behaviors of 4 concrete track girder models (1:5) in rail transit for 1800 days, with an emphasis on effects of types of concrete, stress differences between upper and lower fibers of midspan sections on time-dependent behaviors of prestressed concrete track girders. The test results show that the midspan deflections of the models increase continuously. And smaller time-dependent deflections at midspan are found in the models with HPC or a lower stress difference between the upper and lower fibers of the section at midspan. The theoretical formula based on age-adjusted effective modulus method is proposed to predict time-dependent deflections of prestressed concrete track girders due to creep and shrinkage of concrete and relaxation of prestressed tendons. The deflections at midspan predicted by the formula were compared to the measured values of the girders tested, with close agreement being observed.
Time-Dependent Behaviors of Prestressed Concrete Track Girders under Sustained Loads
Xue, Weichen (author) / Liu, Ting (author) / Wang, Wei (author)
Advances in Structural Engineering ; 16 ; 1545-1556
2013-09-01
12 pages
Article (Journal)
Electronic Resource
English
Time-Dependent Behaviors of Prestressed Concrete Track Girders under Sustained Loads
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