Nite Element Analysis On Hysteretic Behavior Of Thin-Wall Corrugaed Steel Tube Concrete Columns

In recent years, thin-walled concrete-filled steel tubular columns, owing to its excellent mechanical properties and construction performance, have been widely used in many types of building structures and bridges. While the earthquake damage shows that the local buckling and the seismic capacity of post-buckling performance of thin-walled tube are poor. A new-style thin-walled corrugated steel concrete column is proposed in this paper, which not only takes the advantages of thin-walled steel and concrete into fully play, but also improves the mechanical properties, especially the ductility and the energy dissipation capacity of the original thin-wall corrugated steel tube concrete columns. According to the theory of concrete filled thin-walled corrugated steel hysteretic behavior of members, and parametric analysis made on the basis of concrete filled thin-walled corrugated steel load-displacement hysteretic relationship model, the following specific aspects of the work are made:1. There are two corrugated thin-walled concrete -filled steel tube column have conducted the hysteretic performance test study under a constant axial force and low cyclic horizontal load. The experimental phenomena are summarized in detail as well as there the experimental data were analyzed, contrasted in many aspects, such as hysteresis curves, skeleton curve, stiffness degradation, energy dissipation capacity etc. Comprehensive analysis showed that: thin-walled concrete filled steel tube columns have better constraint performance on core concrete and seismic performance. Axial load ratio is the major influencing factor for the hysteretic performance of the specimen, and with the improve of axial load ratio, performances degradated significantly, for which the axial load ratio should be choosed reasonably.1. Summarize relevant research results at home and abroad, determined by the finite element software ABAQUS modeling of thin-walled corrugated steel hysteretic behavior of concrete filled elements were calculated and analyzed.2. Using the finite element method under cyclic loading concrete filled thin-walled corrugated steel components were calculated hysteresis curve. Considered in the finite element model buashcniger effect of steel under cyclic loads, damage and stiffness degradation of concrete, the finite element method are compared with experimental results, verify the reliability of finite element model.3. Analysis of major parameters on the thin-walled corrugated steel tube load - the impact of displacement hysteretic rules: elastic stiffness and the level of components has increased in capacity with the increase of the thickness of steel, but the effect on the shape of the skeleton curve is a little; axial compression ratio reaches a certain value when descending, strengthening phase stiffness decreases, the ductility decreased with the increase of axial compression ratio, but it does not influence the elastic stiffness component; a certain level of capacity increase with the increase of the yield strength of steel, when the level of increase decreases, the ductility decreases, on relatively small component of elastic stiffness; a certain level of capacity increase with the increase of concrete compressive strength, but when the level of increase decreases, the ductility tends to decrease, but the elastic stiffness of the smaller components; the components in the elastic stiffness and strengthen the smaller stages, components decreasing the level of capacity, capacity reduces the magnitude smaller with the slenderness ratio increases.4. A simplified thin-walled corrugated steel tube bending load-displacement hysteretic relationship model based on analysis of the parameters is proposed, which provide a reference for engineering design.