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Shape memory alloy-based self-sensing active adjustable combination structure post system

A combined structure and memory alloy technology, applied in the direction of electric/magnetic solid deformation measurement, measuring devices, instruments, etc., can solve the problems of not being able to accurately grasp the working state of the structure in real time, difficulty in controlling the degree of restraint, excessive or insufficient strengthening, etc., to achieve Reduce labor demand, huge economic and social benefits, change the effect of fragmentation

Inactive Publication Date: 2018-11-30
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although passive constraints can strengthen and strengthen the structure, there is a certain degree of blindness, and the working status of the structure cannot be accurately grasped in real time, and it is prone to excessive or insufficient reinforcement
At present, there are few studies on the active restraint reinforcement of composite structural columns, and there are difficulties such as difficulty in controlling the degree of constraint. In the existing research, there is no report on active adjustable health monitoring and reinforcement of composite structural columns.

Method used

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  • Shape memory alloy-based self-sensing active adjustable combination structure post system
  • Shape memory alloy-based self-sensing active adjustable combination structure post system

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Experimental program
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Effect test

Embodiment 1

[0033] Such as figure 1 As shown, this embodiment discloses a self-sensing and actively adjustable composite structural column system based on shape memory alloy, which senses the damage state of the composite structural column in real time, and applies controllable active restraint force to the structural column according to the damage condition. The system includes: composite structural column RC, shape memory alloy wire SMA spirally wound and fixed on the outside of the column body, several alloy wire joints SC, column reinforcement layer J, several strain sensors SS, displacement sensors DS, acceleration sensors AS, The data acquisition system DAS is connected with the sensor, and the measurement control system MC is respectively connected with the two ends of the shape memory alloy wire SMA through the wire W.

[0034] The shape memory alloy SMA is spirally wound outside the combined structural column RC, and the position of the shape memory alloy wire SMA is fixed with g...

Embodiment 2

[0038] Such as figure 2 As shown, this embodiment can be regarded as a simplified scheme of the implementation case 1. In this embodiment, a comprehensive health monitoring system is no longer installed separately, and the hoop strain of the structural column RC is measured directly by using the resistance characteristics of the shape memory alloy wire SMA, and according to The measured hoop strain values ​​control the alloy wire temperature and impose appropriate hoop constraints. In the specific implementation process, the shape memory alloy SMA is helically wound on the outside of the combined structural column RC, and the position of the alloy wire is fixed with glue. The combined structural column RC and the shape memory alloy SMA form a whole, and they deform together. The shape memory alloy SMA passes through the wire W and measures The control system MC is connected. Under the action of external load, the combined structural column RC and the shape memory alloy SMA w...

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Abstract

The invention belongs to the technical field of reinforcement and health monitoring of a civil engineering combination structure, and relates to a shape memory alloy-based self-sensing active adjustable combination structure post system. The shape memory alloy-based self-sensing active adjustable combination structure post system mainly comprises a combination structure post, a shape memory alloywire, a post body reinforcement layer, an integral health monitoring system and a measurement control system. The shape memory alloy wire is spirally wound around an outer side of the structure post,the combination structure post and the shape memory alloy wire are synergically deformed under a load effect, and the annular stress of the combination structure post is reflected by the length and the resistance change of the shape memory alloy wire; and a sensor arranged at the post body is used for acquiring complete damage information, warming control is performed on the shape memory alloy wire according to the damage condition of the combination structure post, so that the shape memory alloy wire is recovered and deformed, and a constraint force is applied to the combination post. The shape memory alloy-based self-sensing active adjustable combination structure post system provided by the scheme is simple, is high in practicability and good in compatibility and is convenient to maintain, and health monitoring and active and adjustable reinforcement of the combination structure post in a life cycle period are achieved.

Description

technical field [0001] The invention belongs to the technical field of civil engineering composite structure reinforcement and health monitoring, and relates to a self-sensing and actively adjustable composite structural column system based on a shape memory alloy. Background technique [0002] With the development of our country's society and the improvement of technical level, composite structures have been widely used in various new buildings and special building structures, such as super high-rise structures, heavy industrial buildings, large bridges and long-span space structures, etc. The composite structural column is the key load-bearing component of the composite structure. Once damaged, it will cause catastrophic consequences. In order to fully ensure the safety, comfort and durability of the structure, the composite structural column is monitored for safety and relevant reinforcement and maintenance measures are taken. Measures are crucial. [0003] Shape memory ...

Claims

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Application Information

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IPC IPC(8): G01B7/16G01D21/02
CPCG01B7/18G01D21/02
Inventor 李冬生都方竹张月
Owner DALIAN UNIV OF TECH