Abstract
As the most basic structure, the concrete-filled steel tubular (CFST) frame has been widely used in various structures and systems. Compared with conventional reinforced concrete structures and steel structures, CFST structures in strong earthquake showcase more complicated strength and deformation behavior because there are many factors underlying the failure mode. Furthermore, according to the specifications at home and abroad, the corresponding design method to achieve reasonable failure modes for CFST structures has not been clarified. Based on a destructive test on steel beam-CFST plane frames under constant axial load and lateral load, the fiber mode method and solid element model method are adopted to simulate the failure process of the test frames. Based on finite element model simulations and tests, the fiber model method is proposed to carry out the pushover analysis on the CFST frame structures. The factors behind the reasonable failure mode of steel beam-concrete-filled circular steel tubular (CFCST) frame structures are analyzed. Furthermore, the law and influencing factors behind the ratio of flexural capacity of column to beam, the ratio of line stiffness of beam to column, and the ratio of axial compression on the deformation, bearing capacity, and failure modes of the structure are discussed. Some suggestions on the design of reasonable failure mode of steel beam-concrete-filled circular steel tubular (CFCST) frame structures are proposed.
Highlights
As the most basic structure, the concrete-filled steel tubular (CFST) frame has been widely used in various structures and systems
Based on finite element model simulations and tests, the fiber model method is proposed to carry out the pushover analysis on the CFSTframe structures. e factors behind the reasonable failure mode of steel beam-concrete-filled circular steel tubular (CFCST) frame structures are analyzed
As the most basic composite structure, the concrete-filled steel tubular (CFST) frame has been widely used in the CFST frame structure, CFST framecore tube structure, and other structural systems
Summary
Two typical fiber models provided by Perform-3D [12] were used to define the beam section and column section. e axial force and nonlinear moment in-plane (the out-of-plane moment is elastic) have been taken into consideration in the fiber of beam section. e interactive behavior of axial force and moments in two directions can be considered in the fiber of the column section. E interactive behavior of axial force and moments in two directions can be considered in the fiber of the column section. The fiber model method can effectively simulate various components, the fiber model method is a simplified numerical analysis method and cannot accurately analyze the three-dimensional stress and the bond-slip between steel tube and concrete elements when it comes to the study on the mechanical properties of composite members. E outer steel tubes and joint ring plates of steel beams and columns were modeled based on quadrilateral shell elements (S4). E interface contact between steel tube and concrete, the contact between steel beam, ring plate, and steel tube at joints, and the contact between stiffening plate and steel tube at column foot were considered [13]. As for concrete-filled circular steel tubes, Îľ0 1.12
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