The Application Study On Concrete Bridge FBG Monitoring And Composite Pavement Structure

Fiber Bragg grating strain sensor is a new sensor that is developing rapidly in recent years. It possesses many virtues that include distributing sensing, anti-electromagnetic interference, high precision and good stability, and so on. The extensive interest has been produced because of attractive application of the new sensor in structure health monitoring of large civil engineering structures, such as large-span bridges.The excellent linearity, sensitivity and repetition of Fiber Bragg grating strain sensor were confirmed by comparing the strains of Fiber Bragg grating strain sensor and resistance strain gauge from the equivalent-strength standard beam under the same static state force. This paper is concentrated on the experiment on the performance of Vibrating Wire Sensors and FBG sensors which are placed in a concrete beam. The experimental results demonstrate that FBG sensors is prior to vibrating wiresensors. Based on the application of FBG sensing technology in bridge structure monitoring ,this article also discusses the major problems faced in a project and its realization approachs.Before studying the concrete composite deck pavement, we introduce the basic theory of touching analysis, and come up with the realization of touching analysis in the FEM analysis considering the touch of concrete bridge cover plates, asphaltum concrete overlay with bridge cover etc. Connect with the experiment on the spot of bridge, the software ANSYS is used to solidity modeling and analyzing an assembly simply supported bridge before adding overlap, after adding overlap etc., and study the influence of adding overlap on the underside bridge structures.Based on the FEM model, the mechanics character of the asphaltum concrete overlay has been analyzed with various parameter such as thickness changing, and the controlling indexes of the most adverse stress of this type of asphaltum concrete overlay also has been brought forward. This paper also primary put forward design method of the concrete bridge composite deck pavement structure.