| The thesis studies and analyzes the installation of FPS under four-story steel frame, as well as discusses the isolation performance of FPS through the application of finite element analysiis software SAP2000and earthquake simulation shaking table test, which providing the necessary basis for FPS’ isolated system applying to the actual project.FPS studied in the thesis is composed of Steel-PTFE, but the thickness of PTFE which is attached to the surface of the FPS is uneven brcause of some uncertainty in the process. The coefficient of friction of the four-group FPS in the test have different degrees of diversity. Therefore, all analysis results are from the friction system in the test.Numerical simulation and shaking table test of this thesis, which are both used in different seismic waves and different seismic acceleration, compare the interlaminar shear, interstorey displacement, and horizontal displacement of FPS between seismic isolation and non-seismic isolation.According to the shaking table test, under effects of the small seisms, the interlaminar shear of the isolated structure is equal to or even grater than that of the non-isolated structure; the interstorey displacements of both isolated structure and non-isolated structure are almost the same; FPS is in the stationary state or just has a small amount of slippage, when the effect of seismic isolation is not obvious. Under effects of middle and large earthquakes, with the increase of seismic acceleration, the horizontal displacement of FPS rises correspondingly, when FPS plays a role of sliding isolation; the interlaminar shear and the interstorey displacemen of the isolated structure are obviously far less than that of the non-isolated structure; then a conclusion that FPS has a better capacity for seismic isolation is drawn. With the lower friction coefficient, the horizontal slip of FPS increases significantly through the numerical simulation of FPS at different friction coefficient. According to the decrease of friction coefficient, the interlaminar shear and the interstorey displacemen of the uper structure are both reduced. Therefore, with the reduction of friction coefficient, the effect of seismic isolation of FPS is better. In terms of the FPS, when the tatic friction coefficient is0.05, and the dynamic friction coefficient is0.07, the isolation performance is best.Numerical simulation of the eccentric of the upper structure shows that the eccentric has little impact on installing the interlaminar shear of the structure of FPS, but has a greater impact on interstorey displacemen of that. So, the design and construction of structure should be avoided eccentric in the upper structure.In addition, numerical simulation of different radius of the sliding surface of FPS tells that under small seisms, the change of radius of the sliding surface has little impact on both interlaminar shear of upper structure and horizontal slip of FPS. Under middle and large earthquakes, with the increase of radius of the sliding surface of FPS, the interlaminar shear of upper structure decreases gradually, but horizontal slip of FPS enlarges little by little. By caculation, when the radius of the sliding surface is831mm, the isolation performance the best performance.In the last part of this essay, we talk about some innovative ways of solving the problems, in which FPS will has in the shaking table test, and how to perfect the integral strength of FPS by improving it’s friction material. In order to reduce the cost of FPS and provide reference for later engineering application,we calculate the size of the improved FPS on the basic of the existing FPS as the prototype and the same ultimate bearing capacity. |
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