Experiment And Analysis On Cable-Pylon Anchorage Of Shanghai Yangtse River Bridge

The anchorage zones of pylon in cable-stayed bridge are subjected to large concentrated tendon forces and have complicated structural details. It is very important to know the stress distribution of anchorage zones under cable forces. This paper mainly focuses on load transferring mechanism and the ultimate strength of the cable-pylon anchorage zone under stayed cable forces, based on Shanghai Changjiang Bridge under design.The specimen simulates the 22th segment of the cable-pylon anchorage zone of Shanghai Changjiang Bridge, with a scale of 1:2.5. According to experiment results, under the designed cable forces, the crack width of the concrete pylon at the main-span side reaches 0.15mm, while the crack width at the opposite side reaches 0.12mm. The whole steel anchor box works in elastic behavior. Under the maximum tests loads, which equals 1.7 times the designed cable forces, the crack width of the concrete pylon at the main-span side reaches 0.30mm, while the crack width on the opposite side reaches 0.24mm. Except for some stress concentrated regions of the balance plate, the steel anchor box works in elastic behavior.Finite element analysis is used to study the special behavior of load transferring mechanism of steel-concrete composite pylon under the stayed cable forces. The distribution rate of horizontal component force between steel anchor box and concrete pylon is obtained. The formula is derived to calculate the distribution rate of horizontal component force between steel anchor box and concrete pylon by simplifying the pylon segment as planar frames. And theoretical results are compared to those from finite element method.The whole cable-pylon anchorage zone is modeled using FEM to study the shear...