| With the transmitting clearness, good performance and the fast speed of conduction,mega-frame structure plays an increasingly important role in the modern tall building and hasbeen widely used. Then the seismic performance has been paid more attention. Most of thetraditional seismic design follows the assumptions of the rigid foundation, while ignoring thefoundation and superstructure interaction. In fact, considering the soil-foundation-structureinteraction has a large effect on final analysis. Therefore, considering the interaction between thethree is necessary for the dynamic properties analysis of mega-frame structure.Based on lots of reference, this paper introduced the development and superior of themega-frame structure firstly, systematically summarized the interaction between theoreticalresearch and analysis methods, and elaborated the development trends and problems in the studyarea.According to the analysis above, A3-D finite element model of mega frame-raftfoundation-soil interaction was built by using the software ANSYS. This paper emphaticallyanalyzed the raft-the foundation soil on the upper mega-frame dynamic characteristics andseismic response behavior, which compared with the result in case of the rigid structure of thefoundation; while analyzed the seismic response of interaction system at â…¡, â…¢ class, andcompared the principles of its internal force and deformation response characteristics, and finallysummarized the different types of ground soil dynamic characteristics of structural system.Results show that:(1) Consider the interaction, the upper mega-frame structure to extend the basic cycle, themaximum displacement and acceleration of each floor are increased.(2) Sites in different categories, the structural displacement and internal forces havechanged significantly. Soft soil sites, the interactions behave quite obvious.This paper testified the necessity of the interaction, and provided the basis of theseismic design and the accumulation of deformation. |
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