Design and Experimental Research on Novel CFRP Wire Strand Anchoring System
To enhance the anchoring performance and address uneven stress distribution in CFRP tendons within anchoring systems,this study developed an anchoring system with grooved inner walls for CFRP tendons.Experimental tests were conducted to analyze failure modes,load-displacement relationships,anchoring efficiency,and CFRP tendon strain variations.The effects of grooved inner walls and pre-tensioning on improving the uneven stress distribution of CFRP tendons were assessed using the stress variation coefficient.The results demonstrate that grooved inner walls and pre-tensioning of CFRP tendons can significantly improve the anchoring efficiency of the system,achieving efficiencies exceeding 99%.Experimental observations identified uneven stress distribution in CFRP tendons,primarily attributed to variations in tendon length and shear deformation of the bonding medium.Implementing grooved inner walls and pre-tensioning of CFRP tendons effectively mitigated stress unevenness in the anchoring system.Specifically,with grooves at a depth of 2 mm and spaced 5 mm apart,and a pre-tensioning force of 10%of the nominal ultimate load,the average stress variation coefficient at the midpoint and loading end of the free segment of the anchoring system decreased by 7.16%and 3.86%,respectively.
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