Theoretical Research And Experimental Analysis Of Structural Damping

Build ing structure under wind load, earthquake load and the influence ofdyna mic loading will produce vibration, so the structure vibration ana lys is isparticularly important. The energy diss ipation factors in the structure vibratio n-damp ing-has alwa ys been a mysterious and comp licated research proble m. It is one ofthe basic dynamic characteristics of structure, whic h plays an important role forstructure dyna mic response analys is.This artic le analys is of damp ing proble mma inly from two aspects with thecomb ination of experiment.F irstly, It puts forward a new damp ing mode l. Secondly,the soil-structure dyna mic response to the impact on the syste m damp ing.The study o f damp ing has a long history, but it has been lack of an unifiedunderstand ing. For a lo ng time o n the basis o f a large number of fie ld tests andtheoretica l analys is, people put forwardnumerous damp ing mode l, whic hstill existsmany defects. In this paper, basing o n the most simp le and direct s ingle degree offreedom syste m, author designs a set of experiments to explore the structure of theenergy diss ipatio n mechanis m and its influe nce factors. At last through theoretica lderivation-acceleration damp ing, a new damp ing theory was gained and theexperimenta l data were verified.The structure design of the upper structure damp ing energy diss ipationcons idered is not exactly, the actua l vibration syste m, the affiliated part and itsfriction with princ ipal co mponent accounted for most of the energy diss ipatio nsystem. Based on the rigid fo undation experiment and so il trough experiment wereanalyzed, verified the soil-structure dynamic interaction in the who le vibratio nsystem has muc h effect on the da mping.The experime nt was divided ma inly in two stages. The first phaseconfirms thefeasib ility of acceleratio n damping theory with the horizontal traction experime nt onrigid foundatio n. The second phaseconfirms flexib le foundation for structure dampingeffect with the traction re lease experime nt on the fle xib le foundatio n, cons ideringsoil and structure dyna mic interaction. Fina lly comparing the two stage experime nton the experimenta l data and the comprehens ive ana lys is, we obtain that thefoundatio n soil e nergy cons umption and structure of fr iction e nergy d iss ipatio naccount for a large proportion of the whole syste m damp ing.