Experimental Study On Dynamic Characteristics Of The Air Film Reinforced Concrete Dome Structure

The air film reinforced concrete dome structure imported from the United States and it has the advantages of light weight,fast construction,large space self-clean performance and good seismic performance,which other structures can not be compared with.And it has been used in civil engineering industry in our country.However,the researches on the dynamic characteristic site test of the air film dome structure are blank,and the design of the seismic design of the kind of structure has not yet started at present.With the mature application of computer and signal processing methods,the modern experimental modal analysis method is been greatly enriched,which creates the possibility for the extraction of modal parameters and dynamic analysis of large buildings.This paper introduces the dynamic characteristics testing technology at home and abroad,and sums up the related principles of structural dynamics,the modal test involved random vibration,acquisition,digital signal processing technology,and the theory of modal analysis etc.In the air film reinforced concrete dome structure in cucurbitacin,Ordos,Inner Mongolia,the feasible scheme applicable to the structural dynamic characteristics test is formulated,and the vibration frequencies of coal storage in different conditions like short,a half,a third,and full warehouse are measured,the frequency of condition in short warehouse is compared with the calculated frequency to verify feasibility of using self cross spectral synthesis method of identification of modal frequency.Based on the measured frequency correction method,the storage bunker Zhanqiao affiliated structure on the influence of vibration frequency is fixed,the modified parameter E1 is increased by 67%,and the revised results can reflect the dynamic characteristics of coal reservoir,which can be used as storage bunker and long-term health monitoring state assessment benchmark model.Quality of coal storage in structural dynamic calculation was modified,and the results show that the coal storage quality of 68% involves in the calculation of structural dynamic.Finally,the influence of different coal storage capacity on the dynamic characteristics of coal reservoir is simulated analyzed,which provides references for the seismic design of engineering.