Embedded type sensor of overall process shear stress of concrete dynamic damage

Abstract

The invention discloses an embedded type sensor of overall process shear stress of concrete dynamic damage, which comprises a granite protective cover, a d15 mode piezoelectric ceramic chip, an epoxy resin insulating layer, a shielding lead and a shielding joint, wherein the piezoelectric ceramic chip is welded with the shielding lead to form a whole and is wrapped by using high strength epoxy resin to form an insulating and waterproof protective layer; and the piezoelectric ceramic chip is bonded with the granite protective cover of which the external surface is roughened to form a whole by utilizing the epoxy resin, and thereby the sensor of the concrete internal dynamic shear stress is formed. The sensor has the advantages of interference exemption of a concrete internal stress field, overall process monitoring of concrete internal dynamic damage evolution, good interface compatibility, simple structure and low construction cost.

Description

technical field [0001] The invention relates to an embedded concrete dynamic shear stress sensor, in particular, it can monitor the dynamic shear stress in the whole process of dynamic damage inside the concrete. Background technique [0002] Concrete structures are civil engineering structures with a large volume and a wide area. During service, they may be subjected to dynamic catastrophes such as earthquakes, typhoons, and collisions, resulting in structural damage. Therefore, timely and accurate structural detection is very important for the decision-making of structural maintenance and reinforcement. At present, there are many local damage detection methods for structures, such as ultrasonic method, acoustic emission, infrared thermal imaging method, rebound method, isotope detection method, etc. The shortcomings of these detection methods are: (1) they can only detect qualitatively and cannot give (2) The timeliness of detection is poor, and the evolution process of s...

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Problems solved by technology

[0006] In order to overcome the problems of existing concrete stress sensors in interface compatibility, reliability of stress transmission path, performance stability at high stress levels, etc., the present invention provides an embedded shear stress sensor for the whole process of concrete dynamic damage, which effectively The above-mentioned problems are solved, and the production is simple, the performance is stable, and it is easy to be popularized and applied in the field of civil engineering

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