Abstract

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Title:: Study on Corrosion Properties of Stainless Steel Wire for Cable Use and Time-variant Reliability of Stay Cable of Bridge

Author(s):: GONG Jin-xin; JIANG Li-cai; ZHAO Shang-chuan; YANG Xiao-yan; State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology

Keywords:: bridge engineering; corrosion; stainless steel wire; neutral salt spray test; time-variant reliability

Abstract:: The ordinary galvanized steel wire with null stress and the stainless steel wires with stress level of 0%, 20%, 30%, 40% of their strength were exposed in neutral salt spray test for 7, 20, 40 d, respectively, and the mass loss rate, strength, ductility and fracture surface topography of stainless steel wires were studied. An example of cable stayed bridge was presented to showcase the reliability index of cable made of ordinary galvanized steel wire and stainless steel wires. The results show that the mass loss rate of ordinary galvanized steel wire is 30 times higher than that of stainless steel wire. The mass loss rate of stainless steel wire increases with the increase of stress level, which implies that the stainless steel wire is more easily corroded under high stress. Corrosion in short-term has little effect on the ultimate strength of the steel wire. However, the ductility of stainless steel wire decreases with the increase of stress level. Both the galvanized steel wire and stainless steel wire reveal higher brittleness in the tensile test. The fracture surface topography of galvanized steel wire develops from micro cracks to wide cracks, while the stainless steel wire develops only micro cracks because of lighter corrosion. The reduction rate of reliability index of cable of stainless steel wires with time is lesser than that of ordinary galvanized steel wire.