鋼管再生混凝土柱-H型鋼梁外加強環(huán)式節(jié)點抗震性能研究
[Abstract]:At present, under the guidance of the development policy of "energy saving and emission reduction" and "green environmental protection", the disposal of construction waste has become an important problem that needs to be solved urgently for sustainable development. The emergence of recycled concrete technology not only solves the difficult problem of waste concrete, meets the demand for concrete in contemporary society, but also saves the natural aggregate resources, alleviates the contradiction between aggregate supply and demand, and is beneficial to the protection of the environment. It's a green concrete. In order to solve the problems such as easy cracking, low strength and poor elastic modulus of recycled concrete, the recycled concrete filled steel tube structure was developed with reference to the form of concrete filled steel tubular structure. The joint connection between recycled concrete filled steel tubular column and steel beam is the most important part of the whole composite structure system of recycled concrete filled steel tube, which plays an important role in the distribution of internal force in the recycled concrete filled steel tube frame structure. The transmission of bending moment has the function of guaranteeing the overall stability of the structure. Especially when the structure goes through a large earthquake and enters the yield stage the Liang Zhu joint connection plays an important role in the integrity and stability of the composite structure. This paper focuses on the seismic behavior of steel tubular recycled concrete column-H-type steel beams with external reinforced ring joints under low cycle reciprocating loads, and finds out the main factors that affect its seismic performance. The problems existing in the application of concrete-filled steel tubular joint Liang Zhu are optimized and improved. The main research contents are as follows: (1) according to the actual engineering design, seven scale models are designed according to the 1:2 scale ratio. The main influencing factors are as follows: axial compression ratio, Liang Zhu line stiffness ratio, combined action of recycled concrete floor slab, etc. The influence of high strength bolts on the seismic performance of composite concrete composite slab and core area of profiled steel sheet. (2) the hysteretic curve, skeleton curve, stiffness degradation curve and strength degradation curve of beam end are drawn by using the measured data, and the energy dissipation capacity is analyzed. The ductility coefficient, equivalent viscous damping coefficient and other seismic indexes lay a solid foundation for the application of recycled concrete filled steel tube structure in engineering practice. (3) the fine three-dimensional finite element model is established by using A N S Y S finite element software. At last, the numerical simulation results are compared with the results of the specimen to find out the law of change. The experimental results show that the hysteretic curve of the specimen is full and the energy dissipation ability is strong. Liang Zhu's line stiffness ratio has significant influence on ultimate bearing capacity and energy dissipation capacity of specimens, and has great influence on the seismic behavior of joints, while the change of axial compression ratio of columns has an effect on the bearing capacity of specimens, but the influence is not obvious. The increase of axial compression ratio leads to a slight decrease in ultimate bearing capacity and the ductility of the specimen, and high strength bolts can effectively reduce the shear strain in the core area, but the effect on the ultimate bearing capacity and energy dissipation capacity of the specimen is not obvious.
【學(xué)位授予單位】:西南科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TU398.9;TU352.11
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