Method for testing bridge strain flexibility matrix

A flexibility matrix and bridge technology, applied in vibration testing, elastic testing, machine/structural component testing, etc., can solve the problems of small strain values, cumbersome measurement operations, time-consuming, material and financial resources, etc., to achieve accurate testing , the effect of simple operation

Pending Publication Date: 2021-11-12
SHANDONG JIANZHU UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the strain measurement operation is cumbersome, and is greatly affected by factors such as temperature, measuring instruments, and acquisition equipment. In actual measurement, the strain value is often unable to be accurately obtained, and the strain value is usually relatively small, so it...

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  • Method for testing bridge strain flexibility matrix
  • Method for testing bridge strain flexibility matrix
  • Method for testing bridge strain flexibility matrix

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with accompanying drawing by non-limiting embodiment:

[0048] In the following, a simply supported beam subjected to a uniformly distributed load of 10kN / m is taken as an example for specific illustration. The span of the simply supported beam is 10m.

[0049] As shown in the accompanying drawing, a method for testing the strain flexibility matrix of a bridge comprises the following steps:

[0050] S1: Collection of bridge-related data: For bridges that need to be tested, extensively collect relevant data, mainly including design drawings, as-built drawings, construction logs, maintenance data, and maintenance and reinforcement data of the bridge;

[0051] According to the collected data, the finite element model of the bridge is established, and the lumped mass matrix of the bridge is extracted. The established bridge finite element model should be as consistent as possible with the actual situation...

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Abstract

The invention discloses a method for testing a bridge strain flexibility matrix, which comprises the following steps of: establishing a finite element model according to a design drawing of a bridge, designing an acceleration sensor arrangement scheme, acquiring vertical vibration acceleration response of the bridge under environmental excitation by using an acceleration sensor arranged on the bridge, identifying basic modal parameters such as a vibration mode and a frequency of a bridge by applying a modal identification method, acquiring a concentrated mass matrix of a structure according to the bridge finite element model, calculating a vibration mode mass normalization coefficient, then normalizing an actually measured vibration mode, calculating a strain vibration mode and a strain flexibility matrix of the bridge by utilizing the normalized vibration mode, and predicting the modal strain of the bridge so that the target of conveniently and quickly measuring the actual strain of the bridge is achieved.

Description

technical field [0001] The invention relates to a method for testing a bridge strain flexibility matrix, and belongs to the technical field of bridge bearing capacity detection and evaluation. Background technique [0002] As a kind of local measurement information, strain is the embodiment of bridge strength. It has the advantages of high precision and sensitivity to damage, and is an important information for evaluating bridge performance. However, the strain measurement operation is cumbersome, and is greatly affected by factors such as temperature, measuring instruments, and acquisition equipment. In actual measurement, the strain value is often unable to be accurately obtained, and the strain value is usually relatively small, so it is impossible to accurately measure the strain of the bridge under load. modal. Therefore, the current measurement of bridge strain is still to measure the strain response of the bridge under load by installing test instruments at key posit...

Claims

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Application Information

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IPC IPC(8): G01M5/00G01M7/02G06F30/13G06F30/23
CPCG01M5/0008G01M5/0066G01M7/02G01M7/025G06F30/13G06F30/23
Inventor 亓兴军王珊珊张文武赵越孙绪法
Owner SHANDONG JIANZHU UNIV
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