Fabric Reinforced Cementitious Matrix (FRCM) is a relatively new concrete-retrofitting material, developed to overcome the issues associated with Fibre Reinforced Polymer (FRP). Due to the two different adhesives used in each composite, FRP which is applied using epoxy, is less tolerant to high temperatures and more susceptible to Ultraviolet (UV) radiation compared to FRCM which depends on a cementitious matrix for adhesion. The bond behaviour and failure mode associated with different anchor systems for Carbon- and (Polypara-phenylene-benzo-bisthiazole) PBO-FRCM composites for structural retrofitting are compared and discussed. The lack of clearer grasp on the load transfer within the composite and local strains is a main factor hindering the commercial use of existing anchors. To optimize the efficiency of FRCM anchors, a better understanding is needed of the effects of different parameters on local strain distribution and load transfer efficiency. This comprehensive review of the existing FRCM anchors provides suggestions on research and development priorities. Results show that shear lag effect which was observed as a result of composite thickness would be a good potential subject for further research to better understand the effects of the matrix thickness. Future research should be directed towards more innovative anchoring systems for better control over the failure mode of the composite and for better utilization of the fabric, especially mechanical anchors. The effect of different anchoring systems and the number of layers on the effective bond length of FRCM is also a topic that should be studied further to quantify those effects.

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Innovative Engineering Anchor Systems for Retrofits

  • Abdulla Zahmak,
  • Omar Nofal,
  • Basil Ibrahim,
  • Hamdy M. Mohamed,
  • Hend Elzefzafy

摘要

Fabric Reinforced Cementitious Matrix (FRCM) is a relatively new concrete-retrofitting material, developed to overcome the issues associated with Fibre Reinforced Polymer (FRP). Due to the two different adhesives used in each composite, FRP which is applied using epoxy, is less tolerant to high temperatures and more susceptible to Ultraviolet (UV) radiation compared to FRCM which depends on a cementitious matrix for adhesion. The bond behaviour and failure mode associated with different anchor systems for Carbon- and (Polypara-phenylene-benzo-bisthiazole) PBO-FRCM composites for structural retrofitting are compared and discussed. The lack of clearer grasp on the load transfer within the composite and local strains is a main factor hindering the commercial use of existing anchors. To optimize the efficiency of FRCM anchors, a better understanding is needed of the effects of different parameters on local strain distribution and load transfer efficiency. This comprehensive review of the existing FRCM anchors provides suggestions on research and development priorities. Results show that shear lag effect which was observed as a result of composite thickness would be a good potential subject for further research to better understand the effects of the matrix thickness. Future research should be directed towards more innovative anchoring systems for better control over the failure mode of the composite and for better utilization of the fabric, especially mechanical anchors. The effect of different anchoring systems and the number of layers on the effective bond length of FRCM is also a topic that should be studied further to quantify those effects.