• Mohammad Sameer Attaee
• Mugahied Mohammed Gasmelseed Elmagbool
• T.V.S. Vara Lakshmi

As technology is improving day by day, it provides the opportunity to solve the most complicated and complex functions of different majors especially engineering. One of those is a nonlinear analysis of steel structures due to the gradual increase of various types of loads. This paper 'discusses the linear and nonlinear behavior of steel structure plus its impact on stress and deformation in different stages of loading. Furthermore, how the software such as ADINA version 9.6 and ANSYS version 16.0 (Mechanical APDL) analyze and simulate the material nonlinearity (bilinear, multilinear) and geometric nonlinearity of steel structure. Material nonlinearity 'depends on the young's modulus graph (strain, stress curve), which denotes how stress and strain related to each other during the loading period. The thin cantilever steel solid beam with warehouse frame thick solid cross-section has been selected for analysis purposes in two conditions of linear elastic and bilinear Plastic zone. Entire the conditions vary by replacing the values of E (Modulus of elasticity). The first condition determines the Elastic behavior of the element by considering tangent modulus as E. Bilinear analysis has been taken in two conditions. 1- strain hardening with a tangent modulus of E/100. 2- fully plastic with a tangent modulus of E=0. As the software will not accept the E=0 for fully plastic behavior of the elements so, it has taken E=100. The result, of the displacement and amount of stress generated in structures, have been computed and compared in both states. In conclusion, the linear analysis gives a linear equation of deflection and stress with respect to load. Whereas, for bilinear (strain hardening and fully plastic) the deflections increased with less stress. In the meantime, in linear analysis, the full strength and stiffness of the member are not utilized. In contrast, in nonlinear analysis, the realistic behavior of the structure has been expressed

Bilinear Stress-strain Curve, Finite Element Method, Linear Analysis, Load-Deflection Behavior, Nonlinear Analysis, ADINA and ANSYS software’s.

"Comparison Between Linear and Nonlinear Analysis of Steel Frame and Nonlinear Impact on Behavior of Structures", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.8, Issue 2, page no.1413-1421, February-2021, Available :http://www.jetir.org/papers/JETIR2102168.pdf

"Comparison Between Linear and Nonlinear Analysis of Steel Frame and Nonlinear Impact on Behavior of Structures", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.8, Issue 2, page no. pp1413-1421, February-2021, Available at : http://www.jetir.org/papers/JETIR2102168.pdf