A STUDY ON THE CORROSION MECHANISMS OF SUSPENSION BRIDGE CABLES

Abstract

It was found by the field survey recently conducted on the Innoshima and Onaruto Bridges that suspension bridge main cables were partly corroded. In order to study the cause of this problem, wide and thorough investigation on corrosion environments of model cables and actual cables, corrosion simulation tests of galvanized wires in wet and dry cycle conditions and tests on galvanized wires in the decayed wire protection paste were carried out. It is found by these researches that the water remained inside the cable plays a crucial role, wet galvanized wires are easily corrode, and the decayed paste used on Onaruto Bridge may accelerate the wire corrosion.