規(guī)則高層框架—剪力墻隔震建筑的地震響應(yīng)簡化分析方法
[Abstract]:The application of seismic isolation technology in high-rise buildings has its particularity compared with its application in middle-and low-rise buildings. High-rise isolated buildings usually have a large ratio of height to width and obvious overturning effect. When strong earthquakes act on isolated buildings, the bearing will inevitably produce tensile stress, which is not allowed in the code. How to prevent and reduce the tensile stress of isolation bearing under earthquake action and how to determine the limit value of height-width ratio of high-rise isolated building structure are several urgent problems to be solved in the application of isolation technology in high-rise building at present. This paper first introduces several general mechanical models of isolated bearings. Because the mechanical behavior of lead rubber bearings under earthquake is close to bilinear model, bilinear models are chosen in this paper to characterize the mechanical behavior of bearings. Several equivalent simplified models for structural dynamic analysis of high-rise isolated buildings are introduced. In this paper, two kinds of continuous calculation methods for seismic isolation buildings with regular high-rise frame shear walls are presented. The first method is to use two sandwich beams and many connecting rods to simulate high-rise frame shear wall structures, and calculate the element stiffness matrix of sandwich beams by Matlab programming. The whole stiffness matrix of sandwich beam layer element is assembled into the seismic motion equation of isolated structure to get the dynamic response of the structure. In order to facilitate the engineering calculation, a more practical second method is put forward. In this method, a two-dimensional simplified finite element model of high-rise seismic isolation building is established by using ANSYS. The equivalent composite beam is simulated by two anisotropic beam elements connected with the connecting rod element. The calculation results of the two-dimensional model are compared with the results of the accurate finite element model. The two simplified analysis methods presented in this paper are of great help for the preliminary design of high-rise isolated buildings with regular frame shear walls. Because the ratio of height to width has an important influence on the application of isolation technology in high-rise buildings, the transient analysis of high-rise isolated structures with different height-to-width ratios under rare earthquake action is carried out by using the general finite element software ANSYS. The proposed values of the limit values of the ratio of height to width of isolated structures with different structural systems are obtained and compared with the prescribed values of the ratio of height to width in the present high-rise codes. At the end of this paper, some simple summaries of the above contents are given, and some problems that still exist in high-rise seismic isolation structures are enumerated, and their own views and prospects are given for these urgent problems to be solved.
【學(xué)位授予單位】:華中科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TU973.31
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