Brief introduction of project results

The present invention provides a structure monitoring system and a method, which can be used to monitor the strain of engineering structure by using continuous fiber material such as FRP bar conductive system. The invention reduces the cost of engineering structure health detection system and meets the demand of engineering structure health detection system.

FIG. 1 Schematic diagram of self-monitoring system

Performance indicators

The part to be detected of the engineering structure is provided with a slot; The insulation glue is first brushed in the slot, the FRP bar is arranged in the slot, and a number of conductive glue is arranged on the FRP bar to form n electrodes, and then the insulation glue is brushed in the slot to form an insulating layer; The outer ends of the n electrodes on the FRP bar are connected in series with a constant current source and an ammeter through a wire; In addition to the outermost electrodes at both ends of the FRP bar, the two adjacent electrodes form an independent resistance unit, and the end electrode of each resistance unit is connected with the voltage meter through a wire. The voltage meter is used to measure the resistance of each resistance unit; the voltage meter is connected with the data acquisition and analysis system. The data acquisition and analysis system is used to measure the voltage change, which can be converted to the deformation of FRP bars, and the stress state of FRP bars can be judged.

The structure monitoring method of the invention: firstly, longitudinal grooving and/or spirally arranged grooving along the outer surface of the engineering structure are designed on the part to be monitored of the engineering structure, the depth of which can be lower than the longitudinal grooving, and the above grooving can be used for the arrangement of insulation layer, FRP bar, electrode, wire, etc. A layer of insulating glue is injected into the inner of the longitudinal and spiral grooves of the engineering structure. After maintenance, a thin insulating layer is formed around the grooves, and the engineering structure is well bonded to ensure that the engineering structure is insulated with FRP bars and electrodes. When the engineering structure is stressed, FRP bars are subjected to force in the direction of its arrangement to produce axial deformation. FRP bar resistance changes, and the output resistance changes. The data analysis system calculates the resistance change value according to the measured resistance value, converts it into the axial deformation of FRP bars, identifies the stress state of FRP bars, and outputs the corresponding results, so as to achieve real-time monitoring of the anchor structure and to realize the purpose of engineering structure health monitoring.

Scope of application and market prospects

This achievement mainly relates to the field of structural health monitoring technology, especially to a CFRP based material, which can reduce the cost of engineering structural health inspection system and meet the needs of engineering structural health inspection system.

Investment estimates

Supporting hardware and software equipment, amount: 0.5-1 million yuan.

Means of cooperation

Assignment of patent