Study of Low Retracting Ring Prestressed Anchorage Structure in Pylon of Cable-Stayed Bridge

To design a new type of the prestressed anchorage structure for anchorage zone in pylon of cable-stayed bridge and to avoid the limitations caused by utilization of the common ring prestressed anchorage structure in the pylon of the bridge,the related measures for reducing prestress loss were studied and a new type of the low retracting ring prestressed anchorage structure was developed on the basis of investigation and analysis of the existing research achievements and in accordance with the principle of ring prestress loss of the anchorage zone.By taking the anchorage zone in the pylon of Hanjiatuo Chnagjiang River Bridge as the research object,the low retracting ring prestressed and the U-shape ring prestressed anchorage structures were designed and the effective prestress of the two types of the structures and the stress of concrete of the anchorage zone in the pylon under the action of prestressing were calculated.The results of the calculation demonstrate that the utilization of the low retracting ring prestressed anchorage structure can significantly reduce the prestress loss,the distribution of the effective stress on path is uniform and the distribution of the stress of concrete of the anchorage zone in the pylon is still more uniform.