Development of Hybrid Wires and Cables for Steel Wires Covered with New Materials

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(1)Hybrid wires with nearly full tensile strength and stiffness of new material can be produced by the plutrusion method.(2)The relationship between stress and strain of hybrid wires can be formulated by a bi-linear curve.(3)The safety against the yield limit state, ultimate limit state and hazard state of hybrid wires have to be checked in the design of structures using hybrid wire cables. The safety factors against these three limit states are 1.7,3.0 and 1.1, respectively.(4)Through the elasto-plastic and finite displacement analysis of three cable-stayd bridges and a Nielsen-Lohse bridge designed on trial, it is shown that hybrid wires can be applied to cables in these bridges.(5)The fatigue strength of a hybrid wire is governed by the fatigue strength of the steel wire which is the core member of the hybrid wire.(6)The strength of a present cable consisting of hybrid wires is decided by the strength of its anchorage system.(7)A sophisticated ancorage system with enough strength to ensure the full tensile strength of the hybrid cable could not be developed in this level of own research.(8)The strength of hybrid wires subjected to lateral pressure is nearly equal to the compressive strength of plain concrete.(9)The friction factor of hybrid wires is almost same as that of steel wires.(10)The corrosion protection is necessary in the hybrid wires using carbon fibers, because of electrolytic corrosion.(11)It has been experimentally confirmed that hybrid cables can be transported by forming them a ring with diameter of about 1.5m.(12)A tentative design guide for hybrid wires and hybrid cables is drafted.