原文传递
Effects of Pre-Release Cracks in High-Strength Prestressed Girders; Final rept
| 题名： | Effects of Pre-Release Cracks in High-Strength Prestressed Girders; Final rept |
| 作者： | Wyffels, T.; French, C.; Shield, C. |
| 关键词： | High strength concretes; Prestressed concrete; Girders; Stress analysis; Flexural strength; Highway bridges; Cracking(Fracturing); Camber; Concrete durability; Fatigue tests; Concrete structures; Loads(Forces); Research projects |
| 摘要： | The research project investigated the effects of these pre-released cracks on girder camber, flexural cracking capacity, and steel stress ranges. The research included a parametric study investigating stress ranges in the prestressing strands in uncracked, cracked and partially cracked girder sections to determine if steel fatigue was a concern. An analytical study also was performed, which modeled several pre-release cracks, including models of two experimental girders that developed pre-release cracks, to determine the effect of various cracks on girder stress and camber. The study concluded that steel fatigue in the prestressing strand is a concern in girders that become cracked in service. A loss of compressive stress is believed to occur in the bottom fiber of the girder because of pre-release cracks, which may result in the section cracking at lower applied load. Finite element modeling determined the loss of compressive stress in bottom fiber with pre-release cracks. Analytical models also showed that pre-release cracks remained local to the crack location, that non-linear stress distributions occurred during the process of crack closure, and that the magnitude of the pre-release crack effects depended on the number of cracks, the crack width, and the crack depth. |
| 总页数： | 188p |
| 报告类型： | 科技报告 |
相关文献
- Effects of Vertical Pre-Release Cracks on Prestressed Bridge Girders.
- Effects of Vertical Pre-Release Cracks on Prestressed Bridge Girders.
- APPLICATIONS OF HIGH-STRENGTH CONCRETE TO LONG-SPAN PRESTRESSED BRIDGE GIRDERS.
- MECHANICAL PROPERTIES AND DURABILITY OF HIGH-STRENGTH CONCRETE FOR PRESTRESSED BRIDGE GIRDERS.
- EFFECTS OF STEAM CURING TEMPERATURE ON EARLY PRESTRESS LOSSES IN HIGH-PERFORMANCE CONCRETE BEAMS.
- Acoustic Emission Equipment for Infrastructure Monitoring; Research summary rept. (Final)
检索历史
应用推荐
