A Dynamic Multi-Order Frequency Identification Method for Bridge Structures
A bridge structure and frequency identification technology, applied in the field of identification, can solve problems such as the inability to meet the bridge frequency, and achieve the effect of facilitating safe operation and saving human resources.
Active Publication Date: 2020-12-08
CCCC ROAD & BRIDGE CONSULTANTS
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Problems solved by technology
Most of the existing bridge frequency identification methods perform power spectrum analysis on bridge vibration information, and manually extract appropriate power spectrum peaks to obtain bridge frequencies, which cannot meet the needs of automatic identification of dynamic bridge frequencies.
Method used
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Embodiment 1
[0037] The north branch of Tianhe Bridge in Songyuan City is a self-anchored suspension bridge with space cable plane, and its span layout is (40+100+266+100+40)m. The layout of vibration monitoring accelerometer measuring points for structural health monitoring is as follows: figure 2 shown. Taking the main girder accelerometer measurement points of the north branch bridge of Tianhe Bridge in Songyuan as an example, the first four frequencies of main girder vibration are extracted, and the relevant calculation parameters and bridge structure frequency identification results are shown in Table 1. The identification effect is good, which verifies the accuracy of this method. sex and reliability.
[0038] Table 1 Frequency identification information of the north branch of Tianhe Bridge in Songyuan City
[0039]
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The invention discloses a dynamic bridge structure multi-order frequency recognition method. The method comprises the multiple steps of conducting frequency recognition on various vibration measuringpoints of a bridge structure, conducting power spectrum analysis on vibration data of the i measuring point of the bridge structure and extracting all peak data in a power spectrum of the i measuring point to form a matrix by means of the characteristic that power spectrum crest data increases first and then decreases. According to the method, automated recognition on the dynamic bridge structure multi-order frequency can be achieved according to the characteristics of the power spectrum and the bridge structure frequency, manpower resources can be effectively saved, a premise is provided for real-time pre-alarming of the bridge mode frequency, and the method is beneficial to safety operation of the bridge structure.
Description
technical field [0001] The invention relates to an identification method, in particular to a dynamic bridge structure multi-order frequency identification method. Background technique [0002] The basic connotation of bridge health monitoring is: through the monitoring and evaluation of bridge structure conditions, it can send out early warning signals for bridges under special weather, traffic conditions or abnormally serious bridge operation conditions, and provide basis and guidance for bridge maintenance and management decisions . The frequency information obtained by the bridge health monitoring system is an important index for evaluating the safety state of the bridge. It is particularly important to realize the automatic identification of the frequency of the bridge structure to grasp the safety state of the bridge. Most of the existing bridge frequency identification methods perform power spectrum analysis on bridge vibration information, and manually extract approp...
Claims
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IPC IPC(8): G01H17/00
CPCG01H17/00
Inventor 姚建群王俊博于文志杨书仁丁松
Owner CCCC ROAD & BRIDGE CONSULTANTS