|
With the advancement of science and technology , the demand of the development of modern industry and the future of mankind , modern engineering structures are to large, complex , automated and continuous development of these large and complex structure , design load in complex service environment will suffer threatened , as well as the safety of the fallout of the structure of a variety of unexpected external factors . The water conservancy especially the huge dam , dam caused varying degrees of damage be suffered earthquakes , floods , shock , temperature , and other changes in the natural environment . In addition , the service life of dams and other hydraulic structures building materials is also a test of the safety of the building itself . Once the crash will be the people's life and property safety , modernization incalculable loss . Therefore, monitoring and diagnostic performance of dams and other hydraulic structures to detect damage to the building , to predict the disasters that may occur , to assess its safety has become an inevitable requirement for the future construction of water conservancy projects , but also hydraulic engineering disciplines the development of an important area . This article through the analysis of the the cantilever model damage test and Qingtongxia Hydropower Station dam structure field test signal , the analysis of the structural dynamic characteristics and damage diagnosis research , including : (1) Comparative studies have shown that the measured signal and band pass filter and then can largely improve the recognition accuracy, and time domain analysis of the analog signal and a cantilever model experiment of this method was verified . ( 2) cantilever model damage test , drawn according to the strain modal strain mode difference , standard deviation identifies the amount of damage identification , and can damage location . (3) In this paper, time-domain analysis of flow-induced vibration of the cantilever modal parameter identification , recognition results and very close to the theoretical value . (4 ) application domain analysis of discharge vibration the Qingtongxia hydropower dam structure - based identification of modal parameters , the damage diagnostic analysis and application identification results .
|