原文传递
Developing Extended Strands in Girder-Cap Beam Connections for Positive Moment Resistance.
| 题名： | Developing Extended Strands in Girder-Cap Beam Connections for Positive Moment Resistance. |
| 作者： | Tsvetanova, K.; Stanton, J. F.; Eberhard, M. O. |
| 关键词： | Girder bridge, Prestressed concrete girders, Bridge components, Longitudinal seismic resistance, Positive moment, Extended girder strands, Girder-cap beam connection, Precast prestressed concrete girders, Strand anchorage bearing capacity, Bridges constructed, Mechanical anchorage, Seismic connection details, Concrete girders, Flexural analysis |
| 摘要： | In bridges constructed with precast pre-stressed concrete girders, resistance to seismic effects is achieved by the interaction between the columns, the cap beam and the girders. These components must be connected to provide flexural resistance. Under the impact of longitudinal seismic motion, the bottom flanges of the two girders that meet end-to-end at the cap beam will be under tension and compression, respectively. The tension connection between bottom girder flange and cap beam is presently made by extending some of the bottom strands into the cast-in-place diaphragm. At this location, the space available is too small for development by bond in the straight strands alone, so some form of mechanical anchorage is needed. Since concrete in the diaphragm is highly confined, it can probably carry high bearing stress and an anchor with a small bearing area may be possible. Thus, the goal of this project is to create a reliable, effective, as well as practically applicable, way of anchoring strands extended from the girder into the cap beam. The first stage in the development of the girder-diaphragm seismic connection consists of establishing the adequacy of the smallest possible strand anchor that still leads to a strand ductile failure due to yielding rather than strand anchor failure by crushing of the concrete. As a second stage, the impact of the possible failure mechanisms of the strands, embedded in the diaphragm, on the development of the girder-cap beam positive moment connection was investigated. Finally, the distribution of girder bending moments across the bridge deck was evaluated, while investigating the influence on that distribution of the most important bridge parameters, such as cracking of bridge components, as well as varying cross sectional dimensions. |
| 报告类型： | 科技报告 |
相关文献
- Methodologies for Evaluation of Effective Slab Width.
- Fatigue of Stud Shear Connectors in the Negative Region of Steel Girder Bridges; A synopsis of Experimental Results and Design Recommendations
- Fatigue of Stud Shear Connectors in the Negative Region of Steel Girder Bridges: A Synopsis of Experimental Results and Design Recommendations. Final Report
- Acousto-Ultrasonic Technology for Nondestructive Evaluation of Concrete Bridge Members Strengthened by Carbon Fiber-Reinforced Polymer.
- Structural Behavior of Column-Bent Cap Beam-Box Girder Systems in Reinforced Concrete Bridges Subjected to Gravity and Seismic Loads Part I. Pre-Test Analysis and Quasi-Static Experiments.
- Connections Between Simply Supported Concrete Beams Made Continuous: Results of NCHRP Project 12-53.
检索历史
应用推荐
