Comparison of the Performance Between Concrete Filled and Stiffened LDSS Column

Stainless steel is employed in a wide range of structural applications such as in bridges, storage tanks and reinforcing bars for concrete structures. Among the various grades of stainless steel, austenitic grades are most popular in the construction industry which has nickel content 8–11%. Recently, a new form of a duplex stainless steel is developed which is lean duplex stainless steel (LDSS), which has a lower nickel content of about 1.5%. This grade has lower-cost, improved corrosion resistance and strength, enabling a reduction in section sizes leading to higher strength to weight ratios. The particular grade used in this study is EN 1.4162, which is generally less expensive than the austenitic counterpart but offers higher strength and a reasonable corrosion resistance. In this study, the buckling performance of different shaped (square, L, T, cross (+)) lean duplex stainless steel hollow stub columns with stiffeners are investigated. Also performance of LDSS stub column is compared with concrete filled stub column. A nonlinear static analysis of LDSS stub column is studied using ANSYS workbench. In this project, it is found out that buckling capacity increases by changing the section from square-T-L–cross shape. It is also inferred that sections with stiffeners at the corners show better performance than straight stiffeners.