Abstract
In order to study the effects of corrosion damage on the hysteresis properties of high strength steel (HSS), dry-wet cycle corrosion tests were conducted on Q690D steel to obtain 6 batches of corroded specimens, and cyclic loading tests were performed on them to analyse the degradation law of hysteresis curve, skeleton curve and hysteretic energy, and then establish the hysteresis constitutive model of corroded HSS steel. Results indicated that although the hysteresis curves of corroded specimens are still smooth and full, corrosion damage would result in the continuous decrease of peak stress, and lead to the linear reduction of hysteresis energy. Besides, the cyclic hardening coefficient K’ and cyclic hardening index n’ of HSS would also decrease linearly with corrosion degree. Based on these experimental results, a new hysteresis constitutive model for corroded HSS steel was proposed, and its validity was verified.
Highlights
The use of high strength steel (HSS) in steel structures can effectively reduce member cross-sections, thereby reducing costs
Corrosion will change surface feature and mechanical properties of steel, resulting in the decrease of strength and deformability, and even lead to the safety problem of structure. Another non-negligible issue is that the existing corroded steel structures may be threatened by earthquakes during the entire life cycle
Steel structures may undergo a great accumulation of plastic strain and fail after tens of cycles, exhibiting an extremely low cycle damage process with high strain [1]
Summary
The use of high strength steel (HSS) in steel structures can effectively reduce member cross-sections, thereby reducing costs. Corrosion will change surface feature and mechanical properties of steel, resulting in the decrease of strength and deformability, and even lead to the safety problem of structure. Another non-negligible issue is that the existing corroded steel structures may be threatened by earthquakes during the entire life cycle. Steel structures may undergo a great accumulation of plastic strain and fail after tens of cycles, exhibiting an extremely low cycle damage process with high strain [1]. Compared to the monotonic load, the stress state of corroded steel under low cycle hysteresis loading will change greatly [5]. The consistent conclusions were drawn by the low-cycle fatigue tests of corroded S500s steel bars carried out by Apostolopoulos [7]
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