Study of Grouting Hole on Anchor Plate of Prestressed Anchorage System
In the structural design research of prestressed anchorage zone and its anchor plate,to improve the speed of model analysis calculation,the model structure is usually simplified while ignoring the grouting holes,and thus the influence of grouting hole on the stress distribution of prestressed anchorage is also ignored.In this paper,the rotation angle of the anchor plate with grouting hole was used as a variable to study the grouting hole in anchor plates,a 2 200 MPa level prestressed anchoring zone model was established to determine the optimal placement position of the anchor plate.The force transfer test was carried out in the anchorage zone.The results indicate that when the anchor plate is placed at a 45° position,the bearing capacity of the anchorage zone is relatively high,and the anchorage zone is safe and reliable.Due to the presence of grouting hole,stress concentration on the anchor plate occurs at the grouting hole.Therefore,when establishing a strut-and-tie model for the structural design of the anchor plate,grouting hole need to be ignored.Compared with the anchor plate without grouting holes,the maximum principal tensile stress of the anchor plate with grouting hole increased by 34.27%,and the maximum principal compressive stress increased by 4.81%.The maximum principal tensile stress of spiral reinforcement decreased by 4.16%,the maximum Von-Mises stress decreased by 16.83%,and the maximum tensile stress on the side surface of the anchored concrete increased by 1.99%.The experimental results have verified that the structure of the 2 200 MPa level prestressed anchorage zone is safe when the anchor plate is placed at a 45° position.
万方数据
维普
