Study on Localized Pressure-Bearing of Prestressed UHPC Lightweight Anchorage System
Aiming at the structural simplification of the anchorage area in the construction of prestressed concrete structures,a lightweight anchorage system is proposed,and the mechanical performance of the UHPC anchorage is studied by finite element analysis.The results show that there is little difference in the local pressure bearing ca-pacity of the anchoring area and the difference is about 1%when the traditional anchor plate is set and the tradi-tional anchor plate is not set;the local pressure bearing capacity can by effectively improved by setting spiral re-inforcement behind the anchor,and the difference in the local bearing capacity between setting the spiral rein-forcement and not setting the spiral reinforcement are all in the range of 20%and above,and after setting the spi-ral reinforcement behind the anchor,the structural ductility has been greatly improved.Under different local pres-sure ratios,the load carrying capacity is increased by 209%when the local pressure ratio is increased from 1.95 to 4.48;the difference in the ultimate load carrying capacity of different spiral bar diameters is about 5%;the difference in the ultimate load carrying capacity of different restraining diameters of the spiral bars is about 5%;and the difference in the ultimate load carrying capacity of different heights of the spiral bars is about 1%.
ultra high performance concretelocalized pressurelightweight anchoring system
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