Mechanical Properties of Reinforcing Steel and Fatigue Behavior in Corrosive Environment |
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Authors: | ChAlk Apostolopoulos D Michalopoulos |
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Affiliation: | (1) Department of Mechanical Engineering and Aeronautics, University of Patras, Patras, 26500, Greece |
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Abstract: | Corrosion of reinforcing steel has a great impact on the mass reduction and high- and low-cycle fatigue. An experimental study
showed that the mass loss, the fatigue limit and the life expectancy were reduced by approximately 1.50-3.00%, 20-40%, and
55-75%, respectively, according to the level of corrosion. Low-cycle strain controlled fatigue testing under ±1% and ±2.5%
constant amplitude strain, indicated that the corroded steel bars exhibit gradual reduction in available energy, number of
cycles to failure and the load-bearing ability. Formation of pits and notches took place on the corroded steel surface and
stress concentration points were developed which are highly localized at imperfections and especially at the rib bases. The
fatigue limit was reduced considerably since the existence of ribs and the formation of pits and notches combined with the
mass loss led to reduction of the exterior hard layer of martensite and drastic drop in the energy density of the corroded
specimens. Antiseismic design that does not take into account the maximum and cumulative plastic deformation demands and the
strain history that a structure will suffer under severe ground motion could lead to unpredictable performance. |
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Keywords: | BSt500s steel corrosion fatigue low-cycle fatigue mass loss |
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