Estimation of the Remaining Sterength of Locally Corroded P.W.S. Ropes.

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A method to estimate the remaining strength of locally corroded P.W.S. ropes was developed. In this method, the degree of corrosion first evaluated in terms of the loss of cross-sectional area by magnetic inspection. Second, the remaining strength is estimated from the area loss by a numerical simulation of the load-elongation behaviour of the corroded P.W.S. With this method the remaining strength was considerably lower than expected from the area loss, because the P.W.S. consists of wires corroded to various degrees. To verify the validity of this method, bundles of partially thinned wires were examined as a model of locally corroded P.W.S. The area loss and the strength for these specimens were in good agreement with the actual values. The method was then used to evaluated the degree of deterioration of P.W.S.75 ropes that had been seriously corroded during 15 year's exposure to weather as suspension members of roofing. Two P.W.S.75's were removed from the roofing for replacement and then subjected to tensile test. The remaining strength of those ropes was successfully predicted by this method.