Study on compressive behavior of pier concrete strengthened with prestressed ultra-high concrete cylinder pipe jacket
Cross-sea bridges face severe durability problems,especially concrete piers.It propose to protect the concrete columns of o-cean engineering piers from seawater erosion in the form of a sleeve,which sets shear nails on the outer wall of the steel pipe,then pouring ultra-high performance concrete(UHPC)and winding prestressed steel wires,and finally pouring UHPC to form a prestressed ultra-high-performance concrete cylinder pipe(PUCCP).Concrete columns confined by PUCCP were prepared and its compressive tests were con-ducted and compared with plain concrete short columns and concrete columns confined by UHPC in this work.Moreover,the effect of the magnitude of prestress in the PUCCP on the compressive properties for concrete columns confined by PUCCP is analyzed.The experimen-tal results show that compared with the plain concrete columns and the concrete columns confined by UHPC,PUCCP hoops can signifi-cantly improve the compressive strength of the concrete columns,and it increase accordingly with the increase of prestress.The PUCCP hoops to concrete columns can provide a more adequate lateral constraint than that of UHPC hoops to achieve the strain-hardening behav-ior,which significantly improves the initial stiffness and ductility.
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