原文传递
TIMK-DEPENDENT DEFORMATION BEHAVIOR OF PRESTRESSED
HIGH PERFORMANCE CONCRETE BRIDGE BEAMS
| 题名： | TIMK-DEPENDENT DEFORMATION BEHAVIOR OF PRESTRESSED HIGH PERFORMANCE CONCRETE BRIDGE BEAMS |
| 作者： | K. A. Byle, Ned H. Bums, and R. L. Carrasquillo |
| 关键词： | High performance concrete bridges, time-dependent deformation behavior, Texas Type U54 girders |
| 摘要： | Twelve full-scale prestressed high performance concrete Texas Type U54 bridge beams with span lengths ranging from 35.55 to 41.25 meters were instrumented and monitored in the field. The instrumented U-beams were fabricated using 15.2 mm-diameter low-relaxation prestressing strands and concrete with design compressive strengths between 80.0 and 90.3 MPa. Time-dependent camber, deflection, strain at the center of gravity of the prestressing strands, and,*ain distributions at midspan were measured from transfer of die prertressing force until 5 months after completion of the composite deck. Internal beam temperatures at midspan were also measured during that time period, allowing for the measurement of temperature gradients over the beam depth The measured time-dependent camber, deflection and prestress losses at midspan were compared with results obtained usingAASHTO and PCI prediction techniques. Predictions were also made using an analytical time-step method that was developed on a computer spreadsheet program. The analytical time-step method predicted the time-dependent behavior of the instrumented beams fairly accurately, while foe AASHTO ^ PCI methods yielded inaccurate predictions. A set of camber and deflection multipliers were developed based on the analytical time-step method and the measured prestress losses and material properties for foe instrumented beams. The equations for these multipliers were well suited for programming on a computer, although they could also be used for hand calculations. The sensitivity of camber prediction to foe modulus of elasticity at release and the prestressing forced transferred to the beams was investigate using the proposed multipliers. |
| 报告类型： | 科技报告 |
相关文献
- FIBER OPTIC SENSING OF PRESTRESSED-PRISM-REINFORCED CONTINUOUS-COMPOSITE CONCRETE BEAMS FOR BRIDGE DECK APPLICATION.
- EFFECTS OF STEAM CURING TEMPERATURE ON EARLY PRESTRESS LOSSES IN HIGH-PERFORMANCE CONCRETE BEAMS.
- PERFORMANCE OF FIRST STRUCTURE BUILT WITH HIGH-PERFORMANCE CONCRETE IN VIRGINIA.
- Concrete Materials 2016. Transportation Research Record: Journal of the Transportation Research Board, No. 2577
- Spread Prestressed Concrete Slab Beam Bridges.
- Design of Concrete Bridge Beams Prestressed with CFRP Systems.
检索历史
应用推荐
