| Concrete filled steel tube as a kind of composite structure emerging, mainly in the compression member under axial compression and small bias, is widely used in frame structures (such as buildings and high-rise) and bridge engineering. The advantage of the specific performance as follows:high bearing capacity, good ductility, better seismic behavior, and convenient construction, is conducive to fire, corrosion resistance is better than that of steel structure. How to give full play to the stability of concrete compressive strength, steel structure, elastic-plastic, the confinement effect, improve the superimposed effect of the composite and the economy, is an important research topic of the concrete filled steel tube.According to the theory of steel tube concrete overlay, the apparent density and volume stability of different raw materials, preparation of ordinary concrete strength, self compacting concrete, self compacting concrete, expansion of self compacting lightweight aggregate concrete, expansion of self compacting lightweight aggregate concrete, through the thin-walled square steel tube, steel tube filled with four different types of concrete compressive strength, flexural strength test; using ANSYS finite element analysis software, establish the finite element model is consistent with the test component parameters, verify the reliability of the simulation of self compacting concrete thin-wall steel tube loading test software, on the basis of the establishment of self compacting concrete filled thin-walled steel tube, different models, different concrete, concrete filled steel tube, the change of mechanical properties between the steel tube of the three, correlation analysis between steel tube and concrete, concrete filled thin-walled steel tube and steel tube of superposition rule of stress and strain, the optimum parameters of the model for concrete filled thin-walled steel tube.The test results show that:the compressive capacity of concrete filled steel tube concrete and steel is single bearing force and the 1.2-1.5 times. CFST bending bearing capacity is 6.7-7.8 times the force of bending capacity of plain concrete and steel tube. The model parameters of concrete filled thin-walled steel tube model is ideal for:when the wall thickness of greater than or equal to 90, the core concrete strength is greater than C50, slenderness ratio of steel tube and concrete in 4-9, at the same time damage possible; model size 100mm*100mm*400mm*1mm steel, using Q335, C70 as the ideal model of the concrete one, that is almost at the same time to failure of steel tube and concrete.In this paper a hotel project Mount Holyoke case as different structure background analysis, using PKPM software, in the same project, the reinforced concrete column is replaced by the ordinary concrete filled thin-walled steel tubular members, under the action of earthquake response spectrum analysis, elastic time history analysis, the maximum shear stress, the maximum inter story displacement angle, the maximum bending moment and other parameters as the basis of comparison, in order to verify the superiority of the thin-walled concrete-filled steel tubular member; selection of reinforced concrete columns, concrete-filled thin-walled steel tubular columns and steel column, calculated in the same capacity for the three kinds of columns under the action of the force of the cost of materials, the calculation results show that the single column, the costs were reinforced concrete column concrete-filled thin-walled steel tubular columns 944.2 yuan,764 yuan,1785 yuan of H type steel column. This may reflect the thin-wall steel tube concrete mechanics performance, economic performance, This research can offer theoretical guidance for the design of structure engineering materials and construction... |
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