| With the popularization and application of concrete-filled steel tubular structures in high-rise residential buildings and super high-rise buildings,the seismic behavior of concrete filled steel tubular columns with different beam columns has been widely concerned.Up to now,there are many researches on concrete filled steel tubular members,especially on the beam column joints,however,there are few researches on the frame structure of concrete filled steel tube.In this paper,combined with the development and application of concrete filled steel tubular structure and the research focus of the concrete filled steel tubular structure at home and abroad,comparative analysis of the use of two kinds of node connection,the outer stiffening ring node,bolted single span concrete-filled steel tubular column steel concrete beam,concrete filled steel tubular column to steel,mechanical properties and failure modes of steel column and steel beam three combination forms a total of six plane frames.Specific research work mainly includes: On the basis of the existing test data,the establishment of a concrete filled steel tubular column steel beam frame model by finite element software ABAQUS,completed in the numerical calculation of horizontal cyclic loading analysis,finite element calculation results show that the failure mode of the frame model,hysteretic curves and bearing capacity are in good agreement with the experimental data,verify the model selection of material constitutive relationship and bond slip constitutive model,the design and calculation of beam column section size and bolt the three combination form of beam column plane frame structure,and the finite element software ABAQUS to complete the three combinations of two joints six beam column frame structure model in the calculation and analysis under monotonic horizontal load,the calculation results show that the steel tube concrete column steel concrete beam frame structure the horizontal bearing capacity of the largest;completed three kinds of combinations of two kinds of connection mode of six beam column frame structure finite element elastic in the horizontal cyclic loading of the plastic analysis,on the basis of clarifying the plane frame in the process of stress section of micromechanics of stress the distribution and failure mode;comparative analysis of the degradation of two kinds of node connection mode of three kinds of combinations of six plane frame beam column strength,stiffness degradation index,the seismic energy dissipation ability.Numerical calculation hysteretic curve is full without pinching the fusiform shape,shows that the energy dissipation capacity are better to strengthen the three combination forms of beam column frame ring and bolt connection;analysis results show that in the connection of the same circumstances,the seismic behavior of concrete filled steel tubular column structure is higher than that of the other two composite structures.Through the analysis of three kinds of combinations of six beam column plane frame structure under horizontal monotonic and cyclic loading on mechanical properties of comprehensive comparison,using steel bolt connection coagulation column of concrete filled steel tube beam frame shows better mechanical properties,and has the advantages of convenient installation in construction,is beneficial to the practice in engineering.The research can provide a reference for the engineering application of concrete filled steel tubular structure. |
