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Refined calculation of time-dependent prestress losses in prestressed concrete girders
Structure and Infrastructure Engineering, 2020Considering the interaction between concrete shrinkage and concrete creep and between the relaxation of prestressing steel and concrete creep in the prestressed concrete member, a refined method fo...
Mingfang Yang, Jinxin Gong, Xiaoyan Yang
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Loss Of Prestress In Pretensioned Prestressed Concrete Beams.
1964PhD ; Civil engineering ; University of Michigan, Horace H. Rackham School of Graduate Studies ; http://deepblue.lib.umich.edu/bitstream/2027.42/183771/2/6412657 ...
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Eigenfrequencies of continuous prestressed concrete bridges subjected to prestress losses
Structures, 2020Abstract The paper presents a numerical procedure to evaluate the consequences of prestress loss on the frequencies of vibration of continuous prestressed concrete (PSC) bridges. The importance of being able to identify an excessive loss of prestressing, caused for instance by the breaking of some strands, is evident considering that currently the ...
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Prestress Losses in Continuous Composite Bridges
PCI Journal, 1986D uring the last 30 years composite construction of concrete slab-on-steel girders has been widely used to form the superstructure of bridges. Generally, such construction has been applied only to simple spans or to the sagging moment regions of continuous spans since transverse cracks will inevitably develop in the region of intermediate supports ...
Mohamed H. Soliman, John B. Kennedy
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Prediction of Long-Term Prestress Losses
PCI Journal, 2007This paper presents an analytical method to predict long-term prestress losses in precast, pretensioned, or posttensioned concrete members. Design aids are presented for cast-in-place, posttensioned concrete bridges. The proposed method is based on equilibrium and compatibility principles of solid mechanics and can be used for multistage loading and ...
Samer A. Youakim +3 more
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Recommendations for Estimating Prestress Losses
PCI Journal, 1975This PCI Committee report summarizes data on creep and shrinkage of concrete and steel relaxation, and presents both a general and a simplified design procedure for using these data in estimating loss of prestress after any given time period. A Commentary explains the design provisions.
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Estimation Method for Prestress Loss of Externally Prestressed Composite Girder Bridges
Advanced Materials Research, 2014To accurately calculate the prestress of externally prestressed composite girder bridges, the six critical factors (the prestressing tendon withdrawal and anchor deformation, friction between prestressing tendon and deviator, prestressing tendon relaxation, concrete creep, concrete shrinkage and temperature changes) that cause the prestress loss of ...
Yong Ming Zhao +2 more
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Exploratory Experimental Study on Fatigue Prestress Loss of Prestressed Concrete Beams
Journal of Highway and Transportation Research and Development (English Edition), 2014To study the fatigue prestress loss of prestressed concrete beams, four bonded post-tensioned bonded concrete simple supported beams were designed and constructed for constant-amplitude fatigue load displacement tests. Strain sensors were embedded into the pre-pressed zone of the mid-span of the simply supported concrete test beams, and the fatigue ...
Ding Zeng +3 more
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1973
Gives a producer-oriented overview of prestress losses. Contains test results and analyses, methods of reducing such losses, and a discussion of future priorities of producer-conducted investigations and input to codes.
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Gives a producer-oriented overview of prestress losses. Contains test results and analyses, methods of reducing such losses, and a discussion of future priorities of producer-conducted investigations and input to codes.
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Bridge Prestress Losses in Dry Climate
Journal of Bridge Engineering, 1998A posttensioned, simply supported, box-girder bridge in southern Nevada was instrumented during construction beginning in June 1992. The study was triggered by concerns over the potential adverse effects of low relative humidity on prestress losses. The variation of prestress forces and deflection was monitored over a 24-month period.
M. Saiidi, E. Hutchens, D. Gardella
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