Multi-functional test-bed for load identification and damage identification of plate-girder structure

A load identification and damage identification technology, applied in the field of structural dynamics, can solve problems such as inability to determine the location and degree of damage, incomplete vibration data, and difficulty in accurate measurement, so as to facilitate basic research, easy installation, and strong operability Effect

Inactive Publication Date: 2016-11-09
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In practice, the identification method based on the frequency change ratio has shortcomings: the natural frequency is not very sensitive to the early damage of the structure, and sometimes it is difficult to obtain the correct identification result for the slight damage with stiffness damage less than 60%; In the low stress area of ​​the structure, damage identification cannot be performed by using the change of natural frequency; and the measurement frequency is not enough to provide sufficient information for damage identification, usually only the existence of damage can be determined, but the location and degree of damage cann

Method used

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  • Multi-functional test-bed for load identification and damage identification of plate-girder structure
  • Multi-functional test-bed for load identification and damage identification of plate-girder structure

Examples

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Embodiment 1

[0034] like figure 1As shown, the present embodiment includes a T-slot platform 1, a support device, and a movable lifting platform 6. The size of the T-slot platform 1 is 1500*1000*100mm, and the material is 45# steel; the support device includes a support column 2, and supports The top of the column 2 is provided with an air spring 3, the bottom of the support column 2 is installed on the T-shaped slot platform 1, there are 4 support columns 2, arranged in two rows and two columns, and the bottom of the movable lifting platform 6 can be detachably installed on the T-shaped platform. On the groove platform 1, the top surface of the movable lifting platform 6 is provided with a vibration exciter A5, and the vibration exciter A5 is slidably matched with the top surface of the movable lifting platform 6, and the vibration exciter A5 is provided with a vibration exciter mounting seat; the support column The bottom of the vibrator and the bottom of the vibrator mounting seat are a...

Embodiment 2

[0040] like figure 2 As shown, the difference between this embodiment and embodiment 1 is:

[0041] Remove the movable lifting platform 6 and the exciter A5 in Example 1, and add the following parts:

[0042] Liftable beam sample clamping devices 12 are respectively provided on the concave opposite sides of the two support columns 2 in the same row, and traction is set between the two beam sample clamping devices 12 on the two support columns 2 in the same row. Steel wire 7, movable weight base 11 and guide steel wire 8, traction steel wire 7 is fixedly connected with movable weight base 11, traction steel wire 7 is driven by a motor, traction steel wire 7 is set horizontally, and the two ends of guide steel wire 8 are respectively connected to the above two A beam sample clamping device 12, the movable weight base 11 is slidably matched with the guide steel wire 8, and the vibration exciter B10 is installed on the T-slot platform 1. According to needs, there can be multiple...

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Abstract

The invention discloses a multi-functional test-bed for the load identification and damage identification of a plate-girder structure. The multi-functional test-bed comprises a T-type groove platform, a supporting device and a movable lifting stage; the supporting device comprises supporting upright columns; the bottoms of the supporting upright columns are installed on the T-type groove platform; four supporting upright columns are adopted; and the four supporting upright columns are distributed in two rows and two columns; the movable lifting stage is detachably installed on the T-type groove platform; and the top surface of the movable lifting stage is provided with an exciter A. The multi-functional test-bed of the invention can be applied to the load identification and damage identification research of a plate-girder structure test piece. With the multi-functional test-bed adopted, a foundation can be provided for the theoretical application research of structural dynamic characteristic parameter identification, structural optimization and the like.

Description

technical field [0001] The invention relates to the field of structural dynamics, in particular to a multifunctional test bench for plate girder structure load identification and damage identification. Background technique [0002] Structural load identification and damage identification belong to the second category of inverse problems in structural dynamics. [0003] Payload identification technology is also called payload reconstruction or payload deconvolution. It is a technology to reverse the dynamic load of the structure based on the known dynamic characteristics of the structure and the measured dynamic response. Load identification is used as an indirect method to calculate loads in harsh environments or loads that cannot be directly acquired by sensors. In order to solve the inverse identification problem, the structural model must be known. In most practical situations, the load identification problem is ill-conditioned because not all state variables or initia...

Claims

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Application Information

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IPC IPC(8): G01M7/02
CPCG01M7/02
Inventor 缪炳荣杨忠坤李旭娟王名月史艳民陈翔宇周凤
Owner SOUTHWEST JIAOTONG UNIV
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