Optimization design and application of prestressed CFRP plate anchorage
The research showed that plate anchorage need to be grooved on the concrete surface,with short effective travel and cannot be reused.The optimization design and application of plate anchorage has been studied.A new plate anchorage was put forward,which did not need to set the buckle groove on the structural surface,the space occupied was small and the effective utilization length of CFRP board was longer,prestressed CFRP plate anchorage was lightweight and high-strengthand can be reused.The finite element analysis showed that under the calculated load,the anchorage performance can meet the needs of prestressed CFRP reinforcement.The maximum stress values of the anchorage bearing,anchor plate and anchor bolt were 133 MPa,76 MPa,and 94 MPa,respectively.The overall stress distribution was uniformand less than their yield strength.The maximum deformation values were 0.056 mm,0.024 mm,and 0.028 mm,respectively.The anchorage would not be damaged before the structure.With the increasing of the diameter of anchor bolt and the thickness of anchor plate,the internal stress and deformation of the anchorage were improved.The change of the diameter of anchor bolt has a greater impact on the force on the contact part of anchor bolt and anchor plate.The thickness of the anchor plate has a great influence on the stress of the contact part between the concrete surface and the anchor bolt.The recommended diameter of the anchor bolt was 18 mm,and the thickness of the anchor plate was 20 mm.The real bridge application showed that the prestressed CFRP plate anchorage has a good effect.
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