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Steel and Composite Structures
  Volume 43, Number 3, May10 2022 (Special Issue) pages 327-340

Modeling of composite MRFs with CFT columns and WF beams
Ricardo A. Herrera, Teerawut Muhummud, James M. Ricles and Richard Sause

    A vast amount of experimental and analytical research has been conducted related to the seismic behavior and performance of concrete filled steel tubular (CFT) columns. This research has resulted in a wealth of information on the component behavior. However, analytical and experimental data for structural systems with CFT columns is limited, and the well-known behavior of steel or concrete structures is assumed valid for designing these systems. This paper presents the development of an analytical model for nonlinear analysis of composite moment resisting frame (CFT-MRF) systems with CFT columns and steel wide-flange (WF) beams under seismic loading. The model integrates component models for steel WF beams, CFT columns, connections between CFT columns and WF beams, and CFT panel zones. These component models account for nonlinear behavior due to steel yielding and local buckling in the beams and columns, concrete cracking and crushing in the columns, and yielding of panel zones and connections. Component tests were used to validate the component models. The model for a CFT-MRF considers second order geometric effects from the gravity load bearing system using a lean-on column. The experimental results from the testing of a four-story CFT-MRF test structure are used as a benchmark to validate the modeling procedure. An analytical model of the test structure was created using the modeling procedure and imposeddisplacement analyses were used to reproduce the tests with the analytical model of the test structure. Good agreement was found at the global and local level. The model reproduced reasonably well the story shear-story drift response as well as the column, beam and connection moment-rotation response, but overpredicted the inelastic deformation of the panel zone.
Key Words
    analytical models; composite moment resisting frames; concrete filled tube columns; earthquake resistant structures; high strength concretel; high strength steel; nonlinear analysis; steel wide flange beams
Ricardo A. Herrera:Dept of Civil Engineering, University of Chile, Av. Blanco Encalada 2002, Piso 4, 8370449 Santiago, Chile

Teerawut Muhummud:Dept of Civil Technology Education, King Mongkut

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