|Title:||Experimental study on low-cycle cyclic behavior of high strength steel materials|
|Subject:||Steel, High strength.|
Hong Kong Polytechnic University -- Dissertations
|Department:||Faculty of Construction and Environment|
|Pages:||vi, 67 pages : color illustrations|
|Abstract:||High strength steel materials attract more and more attention nowadays. The high strength steel materials have high yield strengths while their ductility is somehow reduced. Under extreme loadings such as earthquakes, these materials should exhibit sufficient ductility during deformations when structures experience large cyclic loadings. In this study, coupons from Q690 steel plates with thicknesses of 6 and 10 mm were tested to obtain uniaxial tensile properties, and the results of coupons cut in both transverse and longitudinal directions were compared. Besides, the uniaxial tension experiments also allowed for stress relaxation, and resulted in a 3% reduction in strength according to static stress-strain curves. For the purpose of studying structural behavior of Q690 steel materials under cyclic loadings, cyclic tests were conducted on 6 specimens with a strain amplitude up to 2.5%. Five specimens achieved 20 cycles of tension-compression loadings, and demonstrated typical hysteretic curves with high energy dissipation capacities. The Bauschinger together with strain hardening were also observed.|
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