Results 81 to 90 of about 216 (114)
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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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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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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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Prestress Losses In Pretensioned Prestressed Concrete Members With Bent Tendons.
1963PhD ; Civil engineering ; University of Michigan, Horace H. Rackham School of Graduate Studies ; http://deepblue.lib.umich.edu/bitstream/2027.42/186118/2/6408155 ...
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Thermal effects on transfer length and prestress losses in CFRP prestressed prisms
Construction and Building Materials, 2023Hamidreza Tahsiri +2 more
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Evaluation of prestress relaxation loss and harping characteristics of prestressing CFRP systems
Construction and Building Materials, 2022Hamidreza Tahsiri, Abdeldjelil Belarbi
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PCI Journal
This study investigates prestress loss measured on precast, prestressed concrete bridge beams for a bridge in Oklahoma. The research examines the effects of including mild reinforcing steel in the bottom flange of precast concrete girder and the alternative prestressing pattern on the prestressing losses of pretensioned bridge girders.
Alla Eddine Acheli +4 more
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This study investigates prestress loss measured on precast, prestressed concrete bridge beams for a bridge in Oklahoma. The research examines the effects of including mild reinforcing steel in the bottom flange of precast concrete girder and the alternative prestressing pattern on the prestressing losses of pretensioned bridge girders.
Alla Eddine Acheli +4 more
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Rapid Accurate Evaluation of Prestress Losses
ACI Journal Proceedings, 1973The difficulty in estimating accurately the losses due to creep, shrinkage, and relaxation of steel lies in: (a) prediction of coefficients related to the quality of concrete, steel, and environment in which the structure will be kept during the period of loss, (b) the interdependence of the amount of prestress loss produced by the three contributory ...
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Prestress Loss as Affected by Type of Curing
PCI Journal, 1964This report describes a three-year investigation of the effect of accelerated curing conditions on the creep and shrinkage properties of the type of concrete frequently used in precasting plants. These concretes were proportioned to achieve a nominal compressive strength of at least 4,000 psi after five or six days of moist curing or in one day of ...
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