Numerical Analysis on Dynamic Interaction of Mega-Frame-Raft Foundation-Sand Gravel Soil Structure

More and more mega-frame structures are extensively adopted by the whole world, because it has the good flexible layout and the good whole space property. But study on dynamic interaction of mega-frame structure is not systematical. This paper calculates the dynamic interaction of the mega-frame-raft foundation-sand gravel soil structure under seismic waves with finite element method. And the numerical calculation includes five projects and contraposes all kinds of factor including: the interaction, the hypo-frame, the model about raft foundation and the thickness of raft foundation. The natural vibration frequency of mega-frame structure and the maximum displacement of all levels are studied. The interaction action change the dynamic characteristic of the whole mega-frame structure, for example, the natural vibration period is extended, the vibration mode is altered and the maximum displacement of the top floor is increased. The results given by the paper might be a significant guide for the interaction theoretical analysis and the engineering of mega-frame structure.