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Passive excitation type bridge damage assessment method

A vibration excitation and bridge technology, which is used in instruments, measuring devices, and analysis of solids using sonic/ultrasonic/infrasonic waves, can solve the problems of reducing the accuracy of detection results, increasing the difficulty and complexity of signal analysis, and improving detection accuracy. Simple and efficient detection method

Pending Publication Date: 2022-06-28
中交路桥检测养护有限公司 +2
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Problems solved by technology

However, since the damage indication value of the non-damage position is close, the damage indication value determination method leads to a large amount of calculation and is complicated. The design of the double excitation wheel also leads to the interference between the feedback signals due to the different tapping positions, which increases the While the signal analysis is difficult, it also reduces the accuracy of the detection results

Method used

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  • Passive excitation type bridge damage assessment method
  • Passive excitation type bridge damage assessment method
  • Passive excitation type bridge damage assessment method

Examples

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Embodiment

[0145] The test specimen is a 12.16m long T beam simply supported at both ends. As shown in Figure 17, the beam has a middle plate with symmetrical structures on both sides, followed by a 2.55m-long constant-thickness web followed by a 2.15m-long variable-thickness web, and finally a 0.85m segment Long equal thickness webs are attached to the end bulkheads. Assuming that the elastic modulus of concrete everywhere on the beam is E = 43.698GPa, Figure 12 shows the distribution of the equivalent bending stiffness of the cross-section of the test beam.

[0146] like image 3 , The rear of the test vehicle weighs 75kg and is a single rear wheel structure, including an excitation wheel, a round shaft and a counterweight. The number of teeth of the excitation wheel is 72, which is composed of rubber and aluminum alloy. The acceleration acquisition point is on the circular axis, 20mm from the midpoint of the rear axle. The natural frequency of the detection car is about 138Hz.

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Abstract

The invention discloses a passive excitation type bridge damage assessment method, which comprises the following steps of: performing passive excitation with fixed excitation frequency on a bridge floor by using excitation wheels uniformly distributed on a single excitation wheel, and acquiring an acceleration signal transmitted to excitation teeth from the surface of a bridge by using an acceleration sensor; and determining the detected stiffness sudden change moment according to the maximum value point of the equivalent acceleration extracted from the time-frequency analysis result, determining the bridge damage position according to the inflection point in the corresponding power spectrogram, and evaluating the damage degree.

Description

technical field [0001] The invention belongs to the technical field of bridge detection, and in particular relates to a passive excitation-type bridge damage assessment method. Exciting teeth evenly distributed on a single excitation wheel perform passive excitation with a fixed excitation frequency on the bridge deck, and use an acceleration sensor to passively excite the bridge deck. The acceleration signal transmitted from the bridge surface to the vibration excitation wheel is collected, and the stiffness change edge is obtained by considering the influence of the derivative term of the equivalent stiffness to time on the acceleration amplitude, and is analyzed in the time domain controlled by the second derivative term of the equivalent stiffness to time At the moment of sudden change in stiffness, look for the inflection point in the power spectrum near this moment to determine the position of the bridge disease and evaluate the degree of the disease. Background techniq...

Claims

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Application Information

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IPC IPC(8): G01N29/04G01N29/44
CPCG01N29/045G01N29/44G01N29/4472G01N2291/023Y02T90/00
Inventor 王世成郭河胡祝友向志海林萍姚君华陆秋海张玉梅李世春
Owner 中交路桥检测养护有限公司
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