Cable structure monitoring method based on long gauge optical fiber grating sensors
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A fiber grating, long gauge technology, which is used in the testing of machine/structural components, optical testing of flaws/defects, and force measurement by measuring the change of optical properties of materials when they are stressed. Capture damage, difficult structure and other problems to achieve the effect of rapid installation
Active Publication Date: 2017-02-22
SOUTHEAST UNIV
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[0004] Traditional sensors can only monitor some specific parameters of the structure, but there are always some shortcomings
Common overall sensors include accelerometers, displacement meters, inclinometers, etc. These sensors can be used to monitor and identify macroscopic indicators such as structural acceleration, displacement, rotation angle, and structural frequency, but it is difficult to effectively identify structural damage with macroscopic indicators of structures
Common local sen...
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[0135] The technical scheme of the present invention will be described in detail below by taking a short cable of Jiangyin Bridge as an example.
[0136] Jiangyin Yangtze River Highway Bridge is located in Xishan, east of Huangtian Port, Jiangyin City, Wuxi City, Jiangsu Province. The main span is 1385 meters (328+1385+295), the sling spacing is 16m, and the side slings are 20.5m from the center line of the tower. The total bridge is 85 pairs. Sling, choose one of the slings as the research object. The length of the selected sling is 6.3m, the diameter is 0.105m, and the elastic modulus of the sling is 1.4×10 5 MPa, the material density is 7800kg / m 3 , Each order of modal damping is equal, the value is 0.05. The tensile force of the selected cable can be checked for the health monitoring data of Jiangyin Bridge, and it is found to be T=526kN.
[0137] Step 1: Use the developed cable clip to arrange the health monitoring system on the structure
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Abstract
The invention discloses a cable structure monitoring method based on long gauge optical fiber grating sensors. The method comprises the following steps that a healthy monitoring system on the cable structure is laid out by utilizing a cable clamp, wherein the healthy monitoring system is composed of a plurality of long gauge optical fiber grating sensors arranged on the cable structure, and a strain signals monitored by the healthy monitoring system is collected through a signal collection system; an exciting hammer is adopted to hammer the node position where the cable structure lays out the long gauge optical fiber grating sensors; the signal collection system collects an impact signal and a long gauge strain time history in a vibration test; a system array based on an identification algorithm of a subsystem is identified, and multi-layered parameters of the cable structure is further identified; identification on cable force is conducted by utilizing identified frequency, and damage of the cable structure is identified and located according to identified formation and flexibility. According to the cable structure monitoring method based on the optical fiber grating sensors, the optical fiber grating sensors are applied to health monitoring of an inhaul cable, and thus stable and reliable monitoring means and method are provided for long-term monitoring and performance evaluation of the cable structure.
Description
Technical field [0001] The invention belongs to the technical field of structural health monitoring, and particularly relates to a cable structure monitoring method based on a long gauge length fiber grating sensor. Background technique [0002] According to relevant information, as of the end of 2014, the total number of highway bridges in my country has reached 757,100, with 4,257,900 linear meters. Among them, there are 3,404 extra large bridges with a total length of 6,105,400 meters, and 72,979 bridges with a total length of 18,630,100 meters. According to statistics, there are 79,600 dangerous bridges of various types, accounting for approximately 10.5% of the total number of bridges, and the health of the bridges is severe. Long-span bridges often use cable-stayed bridges, suspension bridges, tied-arch bridges and other structural forms, among which the bridge cables are the key component of the long-span bridge structure. For example, in 2001, the suspension cable and b...
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