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A detection method and detection device for bridge block impact vibration based on microwave radar device

A technology of shock vibration and microwave radar, which is applied in vibration testing, shock testing, measuring devices, etc., can solve problems such as inability to calculate, low calculation efficiency, and inaccurate identification of high-order modes, and achieve efficient monitoring, efficient acquisition, and sensor reduction number effect

Active Publication Date: 2018-12-18
张建
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Problems solved by technology

However, due to the convergence of the potential energy to the modal order, the high-order modal identification of the structure is inaccurate
At the same time, because the algorithm is an enumeration method, when there are many cases, the calculation efficiency is low, or even impossible to calculate

Method used

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  • A detection method and detection device for bridge block impact vibration based on microwave radar device
  • A detection method and detection device for bridge block impact vibration based on microwave radar device
  • A detection method and detection device for bridge block impact vibration based on microwave radar device

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Embodiment 1

[0123] as attached figure 1 The structure model of the bridge is shown. The bridge has single-lane traffic in each direction. The entire concrete bridge deck is 6.5m wide and 15.54m long, with sidewalks 1.07m wide on both sides. The distance between three simply supported cold-rolled steel I-beams on the reinforced concrete deck is 2.18m. Microwave radar testing such as figure 1 As shown in Fig. 1, the structural response of the whole structure induced by the impact load is collected by changing the test point of the microwave radar equipment. The specific implementation steps are:

[0124] (1) Determination of substructure division scheme

[0125] According to the site environment and bridge structure form of the tested bridge structure, the bridge structure is divided into 21 monitoring points for monitoring, and all the monitoring points are divided into 2 sub-structures for monitoring. The division scheme is as follows figure 2 shown. Substructure 1 mainly includes d...

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Abstract

The invention discloses a bridge block impact vibration detection method and a detection device based on a microwave radar device. The detection method comprises following steps of: dividing a bridge into m sub-structures, and setting an impact force input point and a displacement output point on each sub-structure; successively acting impact force on each sub-structure of a bridge block; synchronously adopting a microwave radar device to acquire displacement time-history data of the displacement output node of each sub-structure; solving a frequency response function of each sub-structure; according to the frequency response function of each sub-structure, identifying a modal parameter of each sub-structure; constructing an MAC matrix of each sub-structure and identifying front k stage modal shape direction coefficient of each sub-structure; adopting a self-adaption genetic algorithm, identifying a modal shape direction coefficient of all stages of each sub-structure; and carrying out flexibility matrix calculation and deflection prediction on all structures. According to the invention, a low-cost and highly-efficient vibration test for known input force of a bridge structure can be truly achieved and the detection method and the detection device can be prompted and applied to detection and safety general investigation of a bridge structure.

Description

technical field [0001] The invention relates to the fields of microwave interferometry technology and bridge health monitoring, in particular to a detection method and a detection device for block vibration testing of bridge structures. Background technique [0002] China is currently in a period of rapid development of new-type urbanization and industrialization, infrastructure investment has steadily increased at a rate of about 15%-20% of the gross national product, and a large number of major infrastructures have been completed or are under construction. On the other hand, my country currently has more than 90,000 dangerous bridges. From 2007 to 2012, a total of 37 bridges collapsed across the country, of which 13 bridges under construction had accidents, resulting in 182 deaths and 177 injuries. On average, there are 7.4 "killing bridges" every year, that is to say, there will be an accident in less than two months on average. During the "Eleventh Five-Year Plan" peri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M7/02G01M7/08
CPCG01M7/02G01M7/08
Inventor 张建赵文举郭双林李攀杰
Owner 张建
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