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Finite Element Analysis on Interior Joint with Core Steel Tube in Concrete Filled Square Steel Tubular under Low Reversed Cyclic Loading

Author: XiaoLiLi
Tutor: WangYiHong
School: Chang'an University
Course: Structural Engineering
Keywords: concrete filled square steel tube joint core steel tube low reversed cyclic loading finite element analysis hysteretic behavor
CLC: TU398.9
Type: Master's thesis
Year: 2009
Downloads: 70
Quote: 0
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Abstract


In this dissertation there are two designs of the concrete frame middle-node of the concrete filled steel tube on the concrete-filled square steel tubular column, the node cut off the outside steel pipe in the node area, setting up core steel tube node to maintain the continuity of the whole column in the nodes through, the steel is passed through the node in the reinforced concrete beams at the same time, the concrete in the beam column node area is also poured, which make the structure to be a whole entity. On the basis of experimental study and theoretical analysis of concrete-filled steel circular tubular column joints under the action of the static pre-load, the paper discussed the study on mechanical behavior of this concrete-filled steel square tubular column joints under the horizontal earthquake action.This article is based on an experimental model, using ANSYS, the finite element analysis software to establish the finite element node model, select the form of the model unit, set up real constant, the definition of material properties, and according to the performance of the node model to determine the various parameters of finite element analysis. Modeling to create a whole entity, to determine the grid, set the conditions for solving the constraint.We use such a node in the concrete-filled steel square tubular column joints for the first time to bear the horizontal earthquake action. Using the finite element software ANSYS, we analyze the whole destruction process of the node model under the action of low cyclic loading. The analysis shows that: in the node model, the damage occurred in the beam end near the node to form the beam hinged collapse mechanism, the phenomenon proves that the feasibility of Abstract. The phenomenon proves that the feasibility of joint with continual beam and discontinuous column. Besides, this node has the same advantage using in concrete-filled steel square tubular column joints and concrete-filled steel circular tubular column joints.Analysis of results showed that the Core Steel Tube and the hoop are the supplement to the node Strength. They make the nodes have high strength reserve and then the nodes have good strength and ductility. According to the hysteric property analysis, Hysteretic curve’s shape of the node is fusiform, which means that in has good energy dissipation capacity.Comparing finite element analysis results of samples with of the pseudo-static test results in the same conditions, ANSYS analysis results was in the line with the test results, it proved that the finite element node model can reflect the true force situation of the node. On this basis, the use of numerical analysis to explore the relevant factors of the impact of node performance, to study the strength of core steel, the concrete of the core area and the outside steel pipe, strength of concrete outside, the steel strength which influence the stress, the Hysteretic Curve and the skeleton curve on the node model to study the impact of the strength of the material to the force properties on the node model. ANSYS analysis showed that the core strength and outer steel pipe strength have a certain influence on the bearing capacity of the node, but they have little influence on of the energy capacity. And the strength of the concrete of the core area have the impact of the Energy Dissipation and the Bearing Capacity on the node model.

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