科研之友
微信
新浪微博
Facebook
分享链接
摘要
To enhance the force transfer reliability of the composite pylon anchorage zone of steel anchor box type, a new type of the structure of the pylon anchorage zone in which both ends of the steel anchor box were fixed was proposed. Based on the mixed finite element models, the steel utilization rates of the steel anchor boxes for the proposed new structure and for the existing pylon anchorage zones of built-in and exposed steel anchor box types, the pylon wall concrete stress and the force conditions of the steel and concrete joints were compared and analyzed. The influences of the lateral plate thickness of the fixed ends and arrangement of the perfobond connectors on the force mechanism of the pylon anchorage zone of the proposed fixed-end steel anchor box type were further investigated. The results of the analysis demonstrate that the pylon anchorage structure of the fixed-end steel anchor box type has high steel utilization rate. The end pylon wall is wrapped with steel plate and the principal tensile stress of the concrete at outside of the pylon wall decreases 1.5MPa as compared to that of the anchorage zone of built-in steel anchor box type. The shear force action of the connectors at the joint of the fixed-end steel anchor box and pylon wall concrete is almost uni-directional and uniform. The lateral plate thickness and arrangement of the connectors have great influences on the shear forces of the connectors. The proposed new structure has high reliability of force transfer and is applicable to the pylon end anchorage structures of cable-stayed bridges with still longer spans.
- 出版日期2015
- 单位同济大学
