水下不規(guī)則網狀空間鋼結構彈塑性動力時程分析
[Abstract]:With the rapid development of China's reform and opening-up and the whole national economy, the spatial structure has sprung up. All kinds of buildings stand majestically in large and medium cities, forming regional symbols, most of which embody the advantages of spatial structure. While making people feel modern civilization, it also reflects that Chinese architectural science and technology has entered a new era that can compete with international strength. But at present, the elastoplastic analysis of structures is mostly aimed at many tall buildings, and the research on underwater irregular space structures is relatively rare. In this paper, elastoplastic dynamic time-history analysis method is used to calculate the response of steel structures with irregular underwater reticular space under rare earthquake. It has certain theoretical significance and reference value for studying the seismic behavior of the structure under rare earthquake and considering the influence of water body factors. The specific processes are as follows: (1) the basic characteristics and related concepts of spatial steel tube structure are introduced, the development process of seismic correlation analysis theory and the history and present situation of seismic correlation analysis are described. (2) the theoretical basis of dynamic elastic-plastic time-history analysis is introduced. Dynamic equilibrium equation and related numerical algorithm; In this paper, the method of selecting seismic waves according to the target response spectrum is described. (3) the elastic-plastic analysis model is established by using the finite element software SAP2000. According to the method of target response spectrum, two groups of natural earthquakes and one group of artificial seismic waves are selected, and 12 working conditions are set according to the input principle of three-dimensional three-direction seismic wave excitation. The elastoplastic dynamic time history analysis under rare earthquake is also carried out. The results show that the overall stiffness of the structure is large and the maximum displacement value is less than the displacement limit value under the action of 9 degrees rare earthquake. The plastic hinge of the structure is less, mainly distributed in the relatively weak central ring, and a few members appear slight damage. The structure achieves the target of seismic performance and has good seismic capability. (4) considering the influence of water damping on the seismic response of the structure, the comparison of the results obtained under rare earthquakes is made by the models of different damping ratios. It is concluded that the influence of water damping should be considered in the dynamic analysis of underwater structures. Then the Housner simplified model and the additional mass model are compared and analyzed, and it is concluded that the sloshing of the water body plays a certain damping effect on the horizontal direction of the structure.
【學位授予單位】:湖南大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TU391;TU352.11
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