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Mechanical Property Analysis And Bearing Capacity Calculation On Four-tube CFST Laced Columns Under Axial Compression

Posted on:2016-05-17Degree:MasterType:Thesis
Country:ChinaCandidate:Y ZhangFull Text:PDF
GTID:2272330464471518Subject:Structural engineering
Abstract/Summary:PDF Full Text Request
Four-tube CFST laced columns refers to the lattice column limb, for concrete filled steel tube column with empty steel tube, steel or steel plate to compose a connection into the lattice of artifacts. It has high bearing capacity, good plasticity and toughness, convenient construction advantages.Therefore, it has been widely applied to the pillars of industrial buildings,high-rise buildings, the load eccentricity ratio of concrete filled steel tube arch bridge in the structure of large or larger slenderness, among which four-tube CFST laced columns is the most widely used. However, since a result of lattice column of steel tube concrete is only a small amount of experimental research at home and abroad, the research content and the parameters are very limited and there is also a lack of comprehensive understanding on its working mechanism and characteristics, which needs further research both in theory and application aspects:In this paper, on the basis of consulting a large number of literature,the concept and structure characteristics of four-tube CFST laced columns under axial compression was analyzed, the status of study on four-tube CFST laced columns at home and abroad was discussed simply. The main research content is as follows:1. Nonlinear numerical simulation analysis was conducted to investigate the mechanical behaviors of four-tube CFST laced columns under axial compression supported by ANSYS software. The elastic buckling and elastic-plastic stability of four-tube CFST laced columns was analyzed by the model, and through the contrastive analysis of the simulation value and experimental value, to determine the accuracy of the model, and analysis of mechanical properties and damage mechanism of the four-tube CFST laced columns.2. Using the three-dimensional finite element numerical analysis model,studying the effect of various parameters(for example: the core concrete grade, the compose pipe and column limb steel grades, the compose and column limb lattice column steel tube wall thickness, the length to diameter ratio and so on) on the mechanical properties and the influence of the ultimate bearing capacity of the four-tube CFST laced columns under axialcompression, thus puts forward references for engineering design.3. Based on the limit equilibrium method theory, the single limb axial compression bearing capacity calculation formula of concrete-filled steel tube column and the four-tube CFST laced columns under axial compression bearing capacity calculation formula of concrete-filled steel tube column considering the influences of slenderness ratio was deduced. Using the formula, the axial compression bearing capacity of the specimen was calculated by the formula.
Keywords/Search Tags:CFST laced columns, axial compression, finite element method, nonlinear analysis, ultimate bearing capacity
PDF Full Text Request
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