Takaaki ISHII
Study on Ultimate Strength of Welded short Columns Fabricated from Stainless Steels
Takeshi MIYASHITA
It is reported that over a haft of old bridge in Japan will have serving over 50 years in upcoming 20 years. The maintenance of these old bridges is costly. Reducing the life cycle cost is vital mission for civil engineering. Due to high corrosion resistance, low life cycle cost and great ductility, stainless steel is expecting as alternative material for structures. However, its performance as well as design criteria are not fully filled and are investigated. This study, the stainless material properties and imperfection of structures are experimentally measured. Ultimate strength of short stainless weld-formed column with various width-thickness ratios was also examined by experiment. Most common stainless materials such as SUS304, SUS316 and Martensite SUS410 were investigated. The research results may give information to evaluate the applicability of stainless in structure as well as to form design criteria of stainless material. This study obtained the follows results:
1.Stress-strain relationship of experimental material showed the unclear yield strength, not as structural carbon steel such as SS400. From the offset yield point or the proof stress in other word, commonly set at 0.2% strain, stainless expresses a great ductility.
2.Residual stress and imperfection in experimental stainless columns formed by welded method satisfy the limits prescribed in Specifications for Highway Bridges, and they can be treated similarly to normal structural carbon steel.
3.Due to its high ductility, the stainless structure reached the ultimate strength at high strain and induced much larger deformation comparatively to normal structural steel.
4.Due to material”Ēs characteristic, compressive structural components applying stainless expressed same ultimate strength with components using normal structural steel.
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