| Single-layer and single-span frame is the most basic mechanical units which compose multi-layer and multi-span frames, and any complex multi-layer and multi-span frames are combined with the basic unit, Therefor, if you want to study mechanical properties of frames,single-layer and single-span frame should be researched. At present the research on concrete filled steel tubular composite structures are mainly concentrated in a single component(especially the concrete-filled steel tube column), and the study of the framework or the whole structure is very few. The study of single component often can not completely simulate the force which the other part exert, and thus the study is not able to fully reflect the force of the real situation.This research is aimed at bolt connection rectangular concrete-filled steel tube beam-column plane frame mechanical properties research. On the basis of pseudo static test data which have obtained in a new type of square steel tube concrete beam-column joints, the finite element analysis software ABAQUS is used to choose reasonable material constitutive relation and to analyze concrete-filled steel tube beam-column joints, and then previous test data is compared with the finite element calculation results, and the finite element model is chosen which compared with the experimental data better. On the basis of the node model, frame calculation model is set up, and ABAQUS is used to analyze different parameters of single span single rectangular concrete-filled steel tube frame under one-way loading and low cycle load. Under monotonic loading, the study researches on the different parameters framework stress process,stress nephogram, and load-displacement curve, and then the framework of bearing capacity and stress distribution,etc are gotten. Under cyclic loading, the study researches on the different parameters framework process, stress nephogram, hysteresis curve, skeleton curve, strength degradation, stiffness degradation curve and ductility coefficient analysis and then the different parameters on the frame stress distribution rule and the influence of the seismic performance are gotten, and then the key factors influencing the mechanical properties of the framework are obtained. The research shows that the bolt connection of rectangular concrete filled steel tubular frame has a good mechanical properties, and the influence of beam line stiffness ratio to frame isthe largest, and the influence of axial compression ratio to frame is smaller than the beam-column yield bending moment. From the point of construction, bolt connection form of concrete filled steel tube structure has the advantage of no field welding, ease of installation and low technical requirement to the worker, so the bolt connection type concrete filled steel tube structure is more advantageous to apply and promote than other forms of concrete filled steel tube structure. |
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