A Method for Structural Earthquake Damage Identification Based on Real-time Monitoring Data

Abstract

The invention discloses a structural earthquake damage identification method based on real-time monitoring data. This method first performs HHT transformation on the time-domain response recorded by the acceleration sensor installed on the equipment or structure within the duration of the earthquake to obtain the high-frequency upper limit of the signal; then performs high-pass filtering on the original signal, and then performs EEMD on the filtered signal Decompose, take the first-order IMF and perform Hilbert transform, gather the obtained time-frequency energy matrix to construct high-frequency energy and vector; finally calculate the abnormality according to the high-frequency energy and the upper and lower quartiles of the vector and the number of elements of the vector The upper limit of the value, the elements in the vector are compared with the upper limit of the abnormal value to obtain the characteristic value of the structural damage quantity. The invention has the characteristics of not relying on the response data when the structure is not damaged, and can directly identify the response of the structure within the duration of the earthquake, and at the same time fully considers the feasibility and convenience of deploying monitoring sensors for power equipment and important building structures in actual engineering In practical applications, only one sensor is needed for the same equipment or structure to achieve the purpose of quickly evaluating whether damage occurs after an earthquake.

Description

technical field [0001] The invention relates to the field of health monitoring and damage identification of electric equipment structures and important building structures, in particular to a structure earthquake damage identification method based on real-time monitoring acceleration response data. Background technique [0002] The large-scale power system that appeared in the 20th century is one of the most important achievements in the history of human science. The power system converts the primary energy of nature into electricity through the power generation device, and then supplies the electricity to various users through power transmission, transformation and distribution. Electricity is the most important basic energy, which promotes economic development and social progress, and is an advanced productivity and basic industry. As the carrier of power transmission in the power system, the power grid is the infrastructure for maintaining the functions of modern cities a...

AI Technical Summary

Problems solved by technology

The low-frequency vibration of the transmission line connected to the transmission tower has a decoupling effect on the input seismic energy. In low-intensity areas, it is difficult for earthquakes to directly cause losses to transmission lines. The more common damage is secondary disasters caused by earthquakes, such as ground deformation, Uneven settlement, landslide, mud-rock flow or sand liquefaction, etc. cause the tower body to tilt, topple, and component damage

[0007] In an earthquake, in addition to direct damage to the equipment, there will also be non-obvious damage such as cracks. If it cannot be found in time for repair or replacement, it may have an unpredictable impact on the subsequent use of the equipment, and even affect the power network. normal operation of

After the Wenchuan Earthquake in 2008, Sichuan Electric Power Test Research Institute conducted ultrasonic flaw detection on porcelain insulators in 10 substations in Deyang City and Mianyang City, including Shifang Wanchun 220kV, Jiangyou Tianming 220kV, Deyang Wulitui 220kV and Guanghan Ancient City 220kV substations. The test results were relatively satisfactory. None of the inspected porcelain insulators were damaged, and the pass rate was 100%. However, the porcelain insulators of the remaining 6 substations were found to have different degrees of crack damage. Among them, the Anxian 220kV substation with the highest damage rate, Five of the eight porcelain insulators inspected had cracks, and the pass rate was only 37.5%.

[0010] The method of using dynamic fingerprints to identify structural damage is relatively common, but this method requires comparison of dynamic fingerprints after structural damage with dynamic fingerprints without damage, and is not suitable for identifying damage to large-scale equipment or existing structures in earthquakes

The method based on model revision needs to continuously update the finite element model, this process requires a lot of calculations, and may not get timely and fast results

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