Fiber bragg grating sensing monitoring method for three-dimensional load transfer rule of multilayer medium structure

Abstract

The invention provides a fiber bragg grating sensing monitoring method for a three-dimensional load transmission rule of a multilayer medium structure, and belongs to the technical field of structural intelligent health monitoring. According to the geometric and material characteristics of each layer of the multilayer dielectric structure, a fiber grating sensing probe packaging material modulus, a bracket type structure and a layout of three embedded fiber grating leading-out wires, which are matched with the measurement of the three-dimensional acting force of each layer of dielectric, are designed. The sensing probe is arranged according to the layered pouring characteristic of the multi-layer medium structure and is connected to the spliced hollow cylinder, so that the assembled sensing probe is formed. In the bearing process of the multi-layer medium structure, the transfer rule of the load along each layer is sensed by the fiber grating sensing probe for testing the three-dimensional acting force of each layer, and the load transfer rule can be obtained by combining a calibration experiment, a structure theory and inversion analysis. According to the assembly type sensing probe structure provided by the invention, an effective device and a technical method are provided for real-time continuous monitoring of three-dimensional load transmission rule information and evaluation of the bearing performance of the multilayer medium structure in the service process of the multilayer medium structure in combination with a structure theory and an inversion method; and meanwhile, a scientific data support can be provided for the problem that the bearing capacity of a multilayer medium structure is difficult to accurately calculate due to a multilayer interface.

Description

technical field [0001] The invention belongs to the field of structural intelligent health monitoring and detection, and relates to a method for testing the law of load transfer in a multi-layer medium structure. Background technique [0002] In order to meet the needs of national strategic development, the engineering field is gradually developing in the direction of "low carbon, energy saving, environmental protection, sustainability, and high energy efficiency", which promotes the application of a series of new materials and new structures in engineering structures. Among them, the multi-layer dielectric structure is the most representative new type of structure, which is composed of different material dielectric layers through interface connection to form a combined structure with improved functions. In actual engineering, the road structure composed of foundation, cement concrete gravel base, asphalt surface layer, the track foundation structure composed of base plate, ...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a fiber grating sensing monitoring method for the three-dimensional load transfer law of a multi-layer dielectric structure, to solve the problem that the load transfer rule of each layer of media cannot be determined due to the complexity and uncertainty of the contact interface during the load-bearing process of the multi-layer dielectric structure. Engineering application design problems such as accurate calculation, difficulty in obtaining load transfer efficiency along the three-dimensional direction of each layer of media, and lack of quantitative relationship information between load transfer laws and geometric and physical parameters of each layer of media

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