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Nonlinear Finite Element Analysis on Square High-strength Concrete-Filled Steel Tubular Short Columns under Axial Loading

Author: LiangZuo
Tutor: DuXiKai
School: Agricultural University of Hebei
Course: Structural Engineering
Keywords: Square steel tube of high strength concrete short columns Axial compression Nonlinear Finite Element Analysis Stress - strain relations ABAQUS
CLC: TU398.9
Type: Master's thesis
Year: 2011
Downloads: 84
Quote: 0
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Abstract

Strength concrete, in addition to the ordinary steel concrete advantages, but also further saving of concrete and reduce the structural weight, which made a huge economic and social benefits, strength concrete in the actual project has been more and more widely Application. However, the other strength concrete short columns emphasis on the experimental study, therefore, necessary to the other strength concrete column finite element analysis, further analysis of its performance under axial compression force. On the basis of past research, the use of finite element analysis software (ABAQUS) to establish high-strength concrete short columns of square steel tube model, using the finite element analysis the other strength concrete short columns under axial compression state failure modes were research, and focused on the difficult to measure in the trials of high strength steel tube and core concrete longitudinal stress - strain relationship, its widely used in the project to provide a theoretical basis. Specific conduct the work of the following aspects: (1) the establishment of a high-strength concrete square steel tube short column model using the ABAQUS finite element software, select a suitable high strength steel tube and core concrete constitutive model. Its core high-strength concrete ABAQUS plastic damage model, using a modified Drucker-Prager yield criterion and flow rule to describe the two main deformation mechanism of the plastic flow of concrete brittle damage in low confining pressure and high confining pressure; steel pipe using ABAQUS provided to the elastic-plastic model, the use of the Von Mises yield criterion and associated flow rule to describe the plastic deformation; model, taking into account the bond-slip effect between the steel tube and core concrete, the steel tube and core concrete interface normal direction of the contact with the hard contact, i.e. perpendicular to the contact surface pressure can be completely transferred at the interface between; cut steel and concrete interface, i.e. the interface shear stress can be passed to the model, using the Coulomb friction model, until the shear stress reaches a critical value after the interface between the relative sliding; addition, initial imperfections of the method applied to the specimen to consider the impact of the steel tube local buckling, finite element calculations, the assumed initial geometry of the steel pipe defects was half-wave distribution. (2) using the finite element method to the other STEEL Concrete Stub Columns force performance analysis. Destroy the modal analysis of a square steel tube short column under axial compression depth reveals the mechanical properties of square steel tube of high strength concrete short columns under axial compression state. And discussed the test is difficult to measure the high-strength concrete core tube confined under longitudinal stress - strain curve of steel pipe in the bottom of the core of high-strength concrete supporting role longitudinal stress - strain curves. (3) The strength concrete under monotonic loading axis pressure of high-strength concrete short columns core longitudinal stress - strain curves to analyze the strength of concrete, steel pipe cross-section width to thickness ratio of the longitudinal stress - strain curve of the core concrete law proposed had to consider the effect of steel tube confined concrete longitudinal stress - strain curve model and skeleton curve several characteristic parameters calculated uniaxial constitutive relation model for simplified fiber model analysis.

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