Bridge damping ratio identification method based on axle coupling
A vehicle-bridge coupling and identification method technology, which is applied to the testing of machines/structural components, instruments, measuring devices, etc., can solve problems such as the immature identification method of damping ratio, and achieve the effect of good identification results and easy operation
Active Publication Date: 2020-10-16
重庆市交通规划和技术发展中心 +2
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[0004] The above content describes the identification process of the parameters of the bridge, but the identification method of the damping ratio is not yet mature
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[0032] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0033] Such as figure 1 As shown, the bridge damping ratio identification method based on vehicle-bridge coupling of the present invention comprises the following steps:
[0034] Step 1, using a moving test vehicle to collect the acceleration response signals of each point of the bridge at a certain sampling frequency;
[0035] Step 2, filtering the acceleration response signal in step 1 through a band-pass filter to obtain the acceleration response of the first-order frequency of the bridge;
[0036] Step 3. Assuming a damping ratio, the original bridge frequency ω 1 Known, the exponential function can be obtained , and then divide the filtered acceleration response in step 2 by the exponential function to obtain the filtered accelerati...
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The invention belongs to the technical field of building structure damage identification, and particularly relates to a bridge damping ratio identification method based on axle coupling. The method comprises the following steps: 1, acquiring acceleration response signals of each point of a bridge by using a moving test vehicle according to a certain sampling frequency; 2, performing filtering processing on the acceleration response signal in the step 1 through a band-pass filter to obtain an acceleration response of the first-order frequency of the bridge; 3, assuming that a damping ratio andthe original frequency omega 1 of the bridge being known, obtaining the numerical value of an exponential function, and dividing the acceleration response filtered in the step 2 by the exponential function to obtain the acceleration response filtered by the undamped bridge; and 4, obtaining the modal of the signal processed in the step 3 through a short-time frequency domain decomposition method,and judging whether the assumed damping ratio is a real damping ratio or not by judging whether the maximum value of the modal is located at the midpoint of the modal or not. Compared with the prior art, the identification result of the bridge damping ratio is good, and the operation is convenient.
Description
technical field [0001] The invention belongs to the technical field of building structure damage identification, and in particular relates to a bridge damping ratio identification method based on vehicle-bridge coupling. Background technique [0002] As an important part of national transportation engineering, bridges play a vital role in the social and economic development of our country. If a bridge fails unexpectedly for any reason, property damage and even major casualties can result. Therefore, it is particularly important to understand the damage characteristics of bridges from the perspective of structural safety. The current bridge health monitoring method is to directly arrange sensors on the bridge to be tested to obtain bridge parameters, which is called the direct measurement method. In the continuous measurement, it is easy to be aged and damaged, and at the same time, there are many unfavorable factors such as time-consuming and labor-consuming, obstructing tr...
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IPC IPC(8): G01M99/00G06F30/23G06F111/10
CPCG01M99/007G06F30/23G06F2111/10
Inventor 阳洋沈小俊唐钰昇袁爱鹏周武召李卫东徐润琴李铁军
Owner 重庆市交通规划和技术发展中心