单边螺栓端板连接钢管混凝土框架的抗震试验与理论研究
[Abstract]:The concrete filled steel tube frame connected with single side bolt end plate is a kind of composite structure which is composed of square or circular concrete-filled steel tubular columns and connected with steel beam through end plate. It has the advantages of good seismic performance, convenient connection, high bearing capacity, etc. It has been proved that the single-side bolted end-plate connections have typical semi-rigid characteristics and can be used in the field of multi-high-rise residential buildings and long-span buildings. At present, a large number of experimental studies have been carried out on concrete-filled steel tubular frames with rigid connections at home and abroad, but the research on semi-rigid concrete-filled steel tubular frames is still rare. In this paper, the quasi dynamic test and nonlinear dynamic time history analysis of concrete filled steel tube frame connected with single side bolt end plate are carried out, and the seismic behavior and dynamic response of this new frame under earthquake action are analyzed. The effect of multi-scale model on the calculation results and efficiency is investigated. The main research works are as follows: (1) the pseudo-dynamic tests of two concrete filled steel tube frames with single side bolt end plate connection are carried out, the dynamic response of the new composite structures under the action of El-Centro seismic wave is evaluated, and the hysteretic properties and ductility of the structures are analyzed. Dynamic magnification factor and energy dissipation and other seismic performance indicators. Under the condition that the column section width and steel content are the same, The influence of column cross-section on the bearing capacity and stiffness of semi-rigid concrete-filled steel tube frame. (2) the finite element model of two two-story single-span single-side bolted end-plate connected CFST frame is established by using OpenSees finite element software. Considering the material nonlinearity and geometric nonlinearity, the node is simplified as the simplified calculation model of bending moment angle proposed in this paper. The Liang Zhu node domain is simulated by a nonlinear spring model. The time-history curve of interstory displacement and the curve of (P) horizontal displacement (螖) relation of horizontal load are obtained, and the results are compared with the experimental results. (3) based on OpenSees program, the theoretical analysis and calculation model of concrete filled steel tube frame connected with single side bolt end plate is established. The rationality and accuracy of the calculation model are verified by experiments, and the relationship between different parameters and hysteretic performance of frame is analyzed. The elastoplastic time-history analysis of a 10-story frame subjected to frequent and rare earthquakes is carried out, and the influence of joint stiffness on the seismic behavior of the frame is studied. (4) the multi-scale model of concrete filled steel tube (CFST) frame with single side bolt end plate connection is established by using ABAQUS software. The joint is modeled with solid element, Liang Zhu with beam element and concrete constitutive model with clear PQ-fiber subroutine. Compared with the simulation results of the model with solid element and member element, the efficiency of multi-scale model is analyzed.
【学位授予单位】:合肥工业大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TU398.9;TU352.11
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