原文传递
Reducing cambers and prestress losses by including fully tensioned top prestressing strands and mild reinforcing steel
| 题名： | Reducing cambers and prestress losses by including fully tensioned top prestressing strands and mild reinforcing steel |
| 正文语种： | 英文 |
| 作者： | Hema Jayaseelan; Bruce W. Russell |
| 关键词： | Bridge; bridge girder; camber; concrete; deflection; girde; losses; prestressed |
| 摘要： | This paper investigates the effects of fully tensioned top strands and inclusion of mild reinforcing steel on prestress losses and camber of pretensioned bridge girders. The results show that the inclusion of both fully tensioned top strands and mild reinforcing steel in the precompression zone reduced both short-term and long-term camber by 72% in the prestressed concrete bridge designs that were studied. Furthermore, the inclusion of both fully tensioned top strands and mild reinforcing steel have small but beneficial reduction in prestress losses. Prestress losses were estimated for a prestressed concrete bridge made with Type IV bridge girders spanning 103.33 ft (31.5 m). Five methods were used to estimate losses, including both the AASHTO LRFD Bridge Design Specifications approximate method and refined method. The newly developed Jayaseelan time-step method is presented and com- pared with other methods. The results show that all five methods estimate prestress losses that were within 2% of one another. |
| 出版年： | 2019 |
| 期刊名称： | PCI-Prestressed Concrete Institute Journal |
| 期： | 3 |
| 页码： | 29-46 |
相关文献
- Structural Performance of Prestressed Concrete Bridge Piles Using Duplex Stainless Steel Strands
- Bonding Time and Prestress Loss in Precast Pretensioned Concrete during Steam Curing
- Flexural Behavior and Design of Ultrahigh-Performance Concrete Beams
- APPENDIX Design example
- Evaluating fatigue, relaxation, and creep rupture of carbon-fiber-reinforced polymer strands for highway bridge construction
- Evaluating fatigue, relaxation, and creep rupture of carbon-fiber-reinforced polymer strands for highway bridge construction
检索历史
应用推荐
