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Truss structure damage positioning method based on added mass

A technology of adding mass and truss structure, which is applied in the direction of using sound wave/ultrasonic wave/infrasonic wave to analyze solids, etc., can solve the problems of application limitations, achieve the effects of convenient operation, simple data processing method, broad application prospects and practical value

Inactive Publication Date: 2013-08-07
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, whether it is based on frequency, DLV or VDM method, it is necessary to arrange more sensors on the truss structure, which limits its application in practical engineering.

Method used

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  • Truss structure damage positioning method based on added mass
  • Truss structure damage positioning method based on added mass
  • Truss structure damage positioning method based on added mass

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Embodiment Construction

[0020] Specific embodiments of the present invention will be described in detail below in conjunction with technical solutions and accompanying drawings.

[0021] by Figure 4 The middle three-span truss is taken as an example to introduce this implementation mode, and the member numbers are shown in Figure 4 , the length of each rod is the same as 1m, the outer diameter of the rod is 5cm, the thickness is 3mm, and the elastic modulus E is 2×10 11 , with a density of 7.83×10 11 kg / m 3 , the joint mass is 0.5kg. The mass block 2 is made of iron, and the two clamps 5 are used to clamp the bar through the bolts 6, and then the mass block 2 is fixed on the connecting piece through the bolts.

[0022] When no mass is added to the rod (i.e. m=0), a vertical unit pulse is directly applied to the middle of the rod 12 (rod d), and the frequency response corresponding to the midpoint is Figure 5 , due to the light weight of the rod stiffness, the frequency corresponding to the pe...

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Abstract

The invention discloses a truss structure damage positioning method based on an added mass, and belongs to the technical field of structure monitoring. The truss structure damage positioning method is characterized in that: the damages to rod pieces of a truss are located by using a method for arranging and testing the rod pieces one by one through a mass block and a sensor. The bending stiffnessof the rod pieces of the truss is required to be smaller than the axial rigidity; a response under partial excitation mainly reflects rod piece information; and the damage positions of the rod piecesare judged by comparing the positions of mass-added rod piece frequency response peak values. According to the method, the shortcomings that the truss structure is insensitive to partial damages and the damage positioning of the rod pieces is difficult to perform are overcome; and the method has the characteristics of simple actual operation, low cost, accurate identification and the like, and isgood in application prospect.

Description

technical field [0001] The invention belongs to the technical field of mass structure monitoring, and relates to a method suitable for locating damage of truss structures, specifically, judging the damage of rods by comparing the frequency response peak positions of each rod with local excitation after adding mass method. Background technique [0002] Structural health monitoring (SHM) is a research hotspot in civil engineering. Damage identification provides a reliable theoretical basis for structural monitoring, early warning and safety assessment, and is an important theoretical basis for structural health monitoring. The truss structure has reasonable stress, simple calculation and analysis, convenient construction and strong adaptability. It is one of the most important structural forms in the field of civil engineering. Truss structures are often composed of hundreds or thousands of members, and the change or damage of each member has little effect on the dynamic info...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/12
Inventor 侯吉林李冬生喻言欧进萍
Owner DALIAN UNIV OF TECH
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