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Bridge foundation scouring diagnosis method based on vehicle excitation force response cross-correlation index system

A dynamic response, bridge-based technology, applied in data processing applications, special data processing applications, resources, etc., can solve problems such as large environmental impact and limited test conditions, and achieve the effect of simple and easy process and multi-point detection.

Active Publication Date: 2020-12-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems that the existing multiple bridge pier scour detection methods rely on the same test conditions before and after, and the test conditions are limited and greatly affected by the environment during detection, a bridge foundation based on the vehicle dynamic response cross-correlation index system is proposed washout diagnostic method

Method used

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  • Bridge foundation scouring diagnosis method based on vehicle excitation force response cross-correlation index system
  • Bridge foundation scouring diagnosis method based on vehicle excitation force response cross-correlation index system
  • Bridge foundation scouring diagnosis method based on vehicle excitation force response cross-correlation index system

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Embodiment 1

[0049]A method for diagnosing scour of a bridge foundation based on a vehicle-driven dynamic response cross-correlation index system, the method for diagnosing scour of a bridge foundation includes the following steps:

[0050] Step 1: According to the structural characteristics of the actual bridge, formulate the layout plan of the measuring points;

[0051] Step 2: Determine the variation range of each test condition in the vehicle dynamic test according to the identified scour depth requirements; control the two test conditions before and after within a certain range of variation;

[0052] Step 3: Carry out the dynamic test of the bridge structure before scouring; when the project is completed, set the range in step 2 (the setting range needs to be set according to the scouring depth to be identified, for example, the example given is able to identify 0.4m or more scour depth, if it is necessary to identify a smaller scour depth, then the set range needs to be smaller), the...

Embodiment 2

[0085] The flow chart of the bridge foundation scour diagnosis method based on the cross-correlation index system of vehicle-driven dynamic response is as follows: figure 1 As shown, the specific process is as follows:

[0086] (1) Formulate a survey point layout plan;

[0087] Establish a benchmark model; establish a finite element model based on the bridge design drawings as a benchmark model, and obtain the frequency and mode shape of each mode; simulate the scour conditions, update the bridge finite element model, and obtain modes that are sensitive to scour. Arrange the measuring points according to the analysis results.

[0088] This implementation plan takes a 4×40m box-type four-lane continuous girder bridge as an example, as Figure 1 ~ Figure 3 as shown,

[0089] (2) Formulate the test plan

[0090] The standard test conditions set in this implementation plan are: the initial speed of the vehicle is 50km / h, the braking stop position of the front axle of the vehic...

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Abstract

The invention discloses a bridge foundation scouring diagnosis method based on a vehicle excitation force response cross-correlation index system. The method comprises the steps of 1, formulating a measuring point layout scheme according to structural characteristics of an actual bridge; 2, formulating a vehicle agonist force test scheme according to the identified scouring depth demand; 3, carrying out a bridge structure dynamic test before scouring; 4, carrying out a dynamic test on the scoured bridge structure; 5, carrying out preliminary diagnosis of scouring; 6, determining a scouring pier position by a single reference point; 7, determining a scouring pier position by multiple reference points; 8, determining whether the scouring is uniform or not; and carrying out transverse correlation analysis on the pier position which is judged to be changed in the scour state in the step 7. The invention aims to solve the problems that the existing various pier scouring detection methods depend on the consistency of previous and later test conditions, the test conditions are limited during detection, and the influence of the environment is relatively great.

Description

technical field [0001] The invention belongs to the technical field of bridge foundation test detection and safety state evaluation; in particular, it relates to a bridge foundation scour diagnosis method based on a cross-correlation index system of vehicle dynamic response. Background technique [0002] During the operation of the bridge, compared with the upper structure of the bridge, the working environment of the lower structure is more complex and harsh. It not only directly bears the self-weight of the upper structure and repeated impacts from passing vehicles, but also bears the scour of running water and the impact of floating objects on ships. Wait for external influences. Coupled with the adverse effects of increasing traffic volume and overloaded vehicles in recent years, the lower structure is prone to damage in varying degrees. Among them, the scour of the pier foundation is the main reason for the change of the characteristics of the bridge foundation and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06F30/23G06F30/13G06F119/14
CPCG06Q10/06393G06F30/13G06F30/23G06F2119/14
Inventor 李岩林雪琦钟以琛孙航杨婷婷马俊刘立鹏
Owner HARBIN INST OF TECH
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