鋼網(wǎng)格盒式結(jié)構(gòu)在近斷層地震作用下的動力響應(yīng)分析
[Abstract]:As a new type of structural system, the steel mesh box structure has a good prospect in the aspects of stress characteristics, building function and economy compared with the traditional structure system. With the expansion of urban construction scope, more and more buildings are likely to be located in the near fault area. The influence of near-fault earthquake with velocity pulse effect on the structure is closely related to the structure cycle. The dynamic response of the structure will be significantly changed, but the seismic behavior of the steel mesh box structure has not been studied in consideration of the effect of near-fault seismic action on the structure. It is of great practical significance to study the seismic behavior of this kind of new structural system under near-fault earthquake. The main work of this paper is as follows: (1) the basic characteristics of near-fault ground motion are introduced in detail, and combined with the seismic records selected in this paper, the near fault pulse type is analyzed. In this paper, the response spectra of nonpulse and general seismic records of near fault and middle and far field are compared and analyzed. (2) the basic principle and mechanical characteristics of steel mesh box structure system are introduced, and the multi-layer and high-rise steel mesh box structure is taken as the object. The finite element analysis model of the structure is established, the dynamic characteristics of the steel mesh box structure are analyzed, and the natural vibration characteristics of the structure are clarified. (3) the nonlinear analysis models of the multi-layer and high-rise steel mesh box structures are established. Using nonlinear time history analysis method, the seismic response of steel grid box structure is analyzed by selecting near fault pulse type, near fault non-pulse type and general middle and far field seismic record as ground motion input, and the displacement response of the structure is analyzed from the view of the displacement response of the structure. The dynamic responses of structures subjected to different earthquakes are investigated in terms of the acceleration of the vertex, the shear force of the base and the distribution of plastic hinges. (4) the results of seismic response analysis are compared. It can be concluded that the dynamic response of the structure under near-fault earthquake is larger than that under the general far-field earthquake. Because the influence of velocity pulse effect on the structure is closely related to the period of the structure itself, the dynamic response of the multi-layer steel mesh box structure under the near-fault impulse earthquake is less than that under the near-fault non-pulse type earthquake. For high-rise steel mesh box structures, The dynamic response of near-fault impulse earthquake is significantly larger than that of near-fault non-pulse earthquake. (5) the displacement of high-rise structure and the demand of base shear force are significantly increased by near-fault impulse earthquake. Especially to change the distribution of interstory displacement along the floor height of high-rise structure, the existence of this unfavorable factor should be fully taken into account in the seismic design of this type of high-rise steel mesh box structure.
【學(xué)位授予單位】:西安理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TU391
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