| The construction scale of strong motion network in China is growing and its application field is expanding.The research and development of technology related to strong motion observation array of building structure has attracted more and more attention from all walks of life.At present,the construction of the array is facing the following problems,which need to be further studied: On the one hand,due to economic constraints,how to use the limited strong motion instrument to locate the core vibration data of the structure at the key position of the building structure is the primary problem to be solved by the strong motion array.On the other hand,how to make full use of the array observation data to accurately analyze the strong motion response of the building structure,so as to achieve the purpose of serving for the earthquake prevention and disaster reduction.Based on a series of building structures,the following work is mainly completed in the research of array layout,relevant pulse data and strong motion records:(1)In view of the limitations of the traditional layout method of seismic strong motion observation arrays for domestic structures,a five-layer composite structure as the research object is selected,finite element software for modeling is used,and a total of 15 two-way ground motion inputs of different types(including types I,II,and III)and different types(including speed pulse,permanent displacement information records)response difference are considerd,according to the floor peak acceleration,peak velocity,peak displacement,the response distribution of the floor maximum angle of displacement between the floor to determine the weak location of the structure.Combined with the traditional layout method of structural seismic strong motion observation arrays in China,the proposed layout arrangement plan for this structure is given.(2)The pulsation data of a high-rise structure station in Harbin with existing arrays are systematically analyzed.Firstly,based on the theory of peak pick-up method and half power bandwidth method,combined with the measured pulsation data,the natural frequency and damping ratio of the structure are identified,and the identification results are in good agreement with the model simulation values.Then,based on the Fourier H/V method of pulsation data,the first two orders of natural frequency of the structure are identified.The results show that the first two orders of vibration mode can better match the actual structure vibration mode,which verifies the feasibility of the method.Finally,according to the recorded seismic data,the health assessment of the structure is carried out.At the same time,on the premise of the limited construction cost of the station,the layout scheme of the building structure array considering the pulsation test is proposed.(3)In this chapter,the strong motion data of the seismic response observation station of Taiwan’s Taidian building are analyzed.First,based on the structural observation data of the Mw7.6 "9·21 Chi Chi" earthquake and the Mw6.8 Hualian earthquake(March 31,2002),identify and find that the natural vibration frequency of the third-order mode has unrecoverably decreased.Therefore,it is concluded that some structural members may be damaged.At the same time,combined with the application of near-real-time methods in structural arrays,through the data processing of the corresponding station data,the health status of the structure can be measured from the story displacement,inter-story displacement ratio,the structure torsion,and the axial displacement angle of the structure make a more intuitive assessment.Finally,according to the different application angles of the seismic response observation array data of the building structure,a suggestion scheme is given for the layout positions of the stations in the structure plane and between each floor. |
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