Assessment of the Finite Element Analysis of Portal Steel Frames with Cold Formed Rectangular Hollow Sections Including Imperfections and Residual Stresses

Elglaad, Sara; Elghandour, Mohamed; Sharaf, Tarek; Elsabbagh, Ashraf

doi:10.21608/pserj.2021.75314.1111

Assessment of the Finite Element Analysis of Portal Steel Frames with Cold Formed Rectangular Hollow Sections Including Imperfections and Residual Stresses

Document Type : Original Article

Authors

¹ Civil, enginering, por sail, porfouad, Egypt

² Faculty of Engineering, Civil Engineering Department, Port Said University

³ Civil Engineering Department, Faculty of Engineering, Port Said University, Port Said, Egypt

⁴ Civil Engineering Department,Faculty of Engineering, Port Said University

10.21608/pserj.2021.75314.1111

Abstract

This paper aims to assess the finite element analysis in predicting the behavior of portal steel frames fabricated from cold formed steel (CFS) rectangular hollow sections. ABAQUS ® was used in the current research to discuss and validate the finite element models with experimental tests on portal frames and knee joints of portal frames. The influence of the nonlinear finite element solution methods, loading type controls, initial imperfections in CFS, residual stresses, mesh density, and different element types were studied. Also, the method of representing the initial imperfection were considered and found to have significant influence on the results. These considerations enabled performing an extensive parametric study. The parametric study consisted of 144 portal frames with various dimensions and RHS sizes. The ultimate load capacity as well as horizontal and vertical displacements that represent the nonlinear behavior of such steel frames were obtained. The failure modes due to material yielding, local buckling, plastic hinges formation as well as interaction of material yielding, and local buckling were also recorded.

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