CN114941995B - Beam bridge steel structure deformation monitoring system based on distributed optical fiber strain test - Google Patents
Beam bridge steel structure deformation monitoring system based on distributed optical fiber strain test Download PDFInfo
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- CN114941995B CN114941995B CN202210414532.4A CN202210414532A CN114941995B CN 114941995 B CN114941995 B CN 114941995B CN 202210414532 A CN202210414532 A CN 202210414532A CN 114941995 B CN114941995 B CN 114941995B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/04—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness by measuring coordinates of points
- G01B21/045—Correction of measurements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention provides a beam bridge steel structure deformation monitoring system based on a distributed optical fiber strain test. The system comprises a sensor module, a dynamic and static strain test conversion control module, a temperature demodulator, a monitoring early warning and a safety evaluation module which are connected in sequence. The sensor module is composed of a distributed optical fiber strain sensor and a temperature sensor, is reasonably arranged in a bridge steel structure, performs temperature compensation on temperature information tested by the connected distributed optical fiber temperature sensor, and transmits the temperature information to the information analysis and monitoring early warning module through corresponding data processing to obtain a safety monitoring report and display the safety monitoring report on the management platform. According to the invention, the data acquisition conditions of the distributed optical fiber strain temperature demodulator are set, so that the distributed high-precision static strain and the distributed low-precision dynamic strain are respectively tested, the sudden collapse and the long-term slow settlement deformation of the bridge steel structure are monitored simultaneously based on the information analysis of the dynamic strain, and the sudden collapse early warning time of the bridge is effectively improved.
Description
Technical Field
The invention relates to the technical field of structural monitoring, in particular to a beam bridge steel structure deformation monitoring system based on a distributed optical fiber strain test.
Background
The steel structure assembled building is a novel standardized and modularized building system which takes a steel structure as a structural system and takes industrial production, assembly construction, integrated decoration and informatization management of parts as main characteristics, has the advantages of rapidness, high efficiency, less field operation, good earthquake resistance and the like, and is easy to realize modernization and industrialization of the building industry. The development and popularization of steel structure assembled buildings have been raised to national policies and become the main direction of the current building industry development in China
In recent years, accidents such as collapse and fire disaster of a plurality of steel structure buildings occur in succession in the world and in the home, so that the process of greatly developing and popularizing the steel structure assembled building is very important for the research and the application of the safety monitoring technology of the steel structure assembled building. Although related national and industrial standards exist in the process of designing, processing, installing and the like of the steel structure assembly type building, at present, a safety monitoring technical system and standard of the building are not formed from the aspect of systemicity, and related technical research and development and engineering application are very few, and even in a blank state. Therefore, the system research and development and application popularization related safety monitoring technology has great significance for building safety, and is more beneficial to the application and popularization of various steel structure assembled buildings.
Disclosure of Invention
The invention provides a beam bridge steel structure deformation monitoring system based on a distributed optical fiber strain test, which judges whether a beam bridge steel structure is in a normal strain state or not according to data measured by an optical fiber strain sensor.
In order to achieve the above purpose, the beam bridge steel structure deformation monitoring system based on the distributed optical fiber strain test comprises a sensor module, a dynamic and static strain test conversion control module, a temperature demodulator, a deformation monitoring early warning and safety evaluation module.
The sensor module, the dynamic and static strain test conversion control module, the temperature demodulator, the deformation monitoring and early warning module and the safety evaluation module are connected in sequence,
the sensor module is composed of distributed optical fiber strain sensors and distributed optical fiber temperature sensors, which are distributed in a beam bridge steel structure, the distributed optical fiber strain sensors are distributed in the beam bridge steel structure in a layered manner, the distributed optical fiber temperature sensors and the distributed optical fiber strain sensors are parallel and are distributed in the same groove and are connected end to form a distributed signal transmission line, and the distributed signal transmission line is connected into a distributed optical fiber strain temperature demodulator, the distributed optical fiber strain sensors at the same position are subjected to temperature compensation by temperature signals tested by the distributed optical fiber temperature sensors,
the distributed optical fiber dynamic and static strain test control module sends instructions for collecting dynamic and static strain to the distributed optical fiber strain temperature collection module, the collected dynamic and static strain information is transmitted to the monitoring early warning and safety evaluation module, and when the distributed optical fiber dynamic and static strain test conversion control module sends dynamic strain collection instructions, the data collection parameters of the distributed optical fiber strain temperature demodulator are set as high-speed low-precision collection conditions: the method comprises the steps of carrying out data acquisition after setting to 11 times of 2 data acquisition average times of a spatial resolution of 2.0m, a distance sampling resolution of 2.0m and a Brillouin frequency scanning step of 10MHz, and setting a data acquisition index of a distributed optical fiber strain temperature demodulator as a high-precision static acquisition condition when a static dynamic and static strain acquisition instruction is sent out by a distributed optical fiber dynamic and static strain test conversion module: : the spatial resolution is 0.5m, the distance sampling resolution is 0.1m, the brillouin frequency scanning step length is 2MHz, the data acquisition average frequency is 2 times 14, the data sampling is carried out after the setting,
the deformation monitoring early warning and safety evaluation module receives and analyzes dynamic and static strain signals, and carries out sudden collapse early warning on the bridge steel structure on the dynamic strain abrupt change signals; calculating the deformation of the steel structure of the static strain signal, and evaluating the safety state of the steel structure of the beam bridge;
the distributed optical fiber dynamic and static strain test conversion control module sends out a static strain acquisition control instruction under the following two conditions: firstly, the deformation monitoring early warning and safety evaluation module sends out the sudden collapse early warning information and simultaneously sends out the static strain acquisition control instruction, and the bridge collapse scale is calculated and analyzed based on the high-precision static strain information, and secondly, the static strain acquisition control instruction of the steel structure is sent out in a time period when the bridge stops passing due to weather reasons or in a maintenance state.
A beam bridge steel structure deformation monitoring system based on distributed optical fiber strain test comprises the following steps:
the distributed optical fiber dynamic and static strain test conversion control module sends out a static strain acquisition control instruction under the following two conditions: firstly, a deformation monitoring early warning and safety evaluation module sends out sudden collapse early warning information and a static strain acquisition control instruction at the same time, and based on high-precision static strain information, the collapse scale of the bridge is calculated and analyzed, and secondly, a steel structure static strain acquisition control instruction is sent out in a time period when the bridge stops passing due to weather reasons or in a maintenance state;
further, according to the calculation result, selecting the mounting point of the distributed optical fiber strain sensor, and selecting the mounting point of the distributed optical fiber strain sensor;
further, the distributed optical fiber dynamic and static strain testing module sends instructions of dynamic and static strain to the distributed optical fiber strain temperature acquisition module, and acquired dynamic and static strain information is transmitted to the steel structure deformation monitoring, early warning and safety assessment module;
further, the remote control room stores the acquired data in the data storage platform, analyzes and processes the field data to form a safety monitoring report, and further processes the result. The method comprises the steps of carrying out a first treatment on the surface of the
Further, according to the strain data detected by the optical fiber strain sensor, respectively comparing with the calculation results of dynamic and static strain formulas to judge whether the steel structure is in a normal strain state,
the dynamic strain calculation formula is:
the static strain calculation formula is:
in the steel pipe outer diameter D 2 (mm), inner diameter D of steel pipe 1 (mm), wall thickness t (mm), length l (mm) of steel tube, interval d (mm) between two intermediate crossing points, total number n of steel tubes, distance x between measuring point of installation sensor on ith unit and crossing point i (mm)。
If all sensors detect data epsilon<ε max All are true, and the steel structure is in a normal strain state; if any one of the sensors detects data epsilon>ε max The steel structure is in an abnormal strain state.
And further, returning the detection result to a monitoring early warning and safety evaluating system, sending an alarm signal when any one sensor detects an abnormal state, and evaluating the safety state of the beam bridge steel structure according to the feedback data at regular intervals according to actual needs.
Drawings
FIG. 1 is a distribution of sensor mounting points in the inventive arrangement;
FIG. 2 is a flow chart of the monitoring method of the present invention;
the above description is merely illustrative of the structure of the present invention, and those skilled in the art will appreciate that various modifications and additions to the specific structure described are possible, without departing from the scope of the invention as disclosed in the accompanying claims.
Claims (1)
1. Beam bridge steel construction deformation monitoring system based on distributed optical fiber strain test, characterized by including: the system comprises a sensor module, a dynamic and static strain test conversion control module, a temperature demodulator, a deformation monitoring early warning and safety evaluation module;
the sensor module consists of distributed optical fiber strain sensors and distributed optical fiber temperature sensors, the distributed optical fiber strain sensors are distributed in a beam bridge steel structure, the distributed optical fiber strain sensors are distributed in a layered mode in the beam bridge steel structure, the distributed optical fiber temperature sensors and the distributed optical fiber strain sensors are parallel to each other and are distributed in the same groove, and are connected end to form a distributed signal transmission line, and the distributed signal transmission line is connected into a distributed optical fiber strain temperature demodulator, and temperature compensation is carried out on the distributed optical fiber strain sensors at the same position through temperature signals tested by the distributed optical fiber temperature sensors;
the distributed optical fiber dynamic and static strain test control module sends instructions for collecting dynamic and static strain to the distributed optical fiber strain temperature collection module, the collected dynamic and static strain information is transmitted to the monitoring early warning and safety evaluation module, and when the distributed optical fiber dynamic and static strain test conversion control module sends dynamic strain collection instructions, the data collection parameters of the distributed optical fiber strain temperature demodulator are set as high-speed low-precision collection conditions: the method comprises the steps of carrying out data acquisition after setting to 11 times of 2 data acquisition average times of a spatial resolution of 2.0m, a distance sampling resolution of 2.0m and a Brillouin frequency scanning step of 10MHz, and setting a data acquisition index of a distributed optical fiber strain temperature demodulator as a high-precision static acquisition condition when a static dynamic and static strain acquisition instruction is sent out by a distributed optical fiber dynamic and static strain test conversion module: the spatial resolution is 0.5m, the distance sampling resolution is 0.1m, the brillouin frequency scanning step length is 2MHz, and the data acquisition average frequency is 2 to the power of 14, and the data sampling is carried out after setting;
the deformation monitoring early warning and safety evaluation module receives and analyzes dynamic and static strain signals, and carries out sudden collapse early warning on the bridge steel structure on the dynamic strain abrupt change signals; calculating the deformation of the steel structure of the static strain signal, and evaluating the safety state of the steel structure of the beam bridge;
the distributed optical fiber dynamic and static strain test conversion control module sends out a static strain acquisition control instruction under the following two conditions: firstly, a deformation monitoring early warning and safety evaluation module sends out sudden collapse early warning information and a static strain acquisition control instruction at the same time, and based on high-precision static strain information, the collapse scale of the bridge is calculated and analyzed, and secondly, a steel structure static strain acquisition control instruction is sent out in a time period when the bridge stops passing due to weather reasons or in a maintenance state;
the strain sensor adopts a distributed optical fiber strain sensor, a sensor mounting point capable of reacting to the strain condition of the structure is selected, and the method for calculating the optical fiber strain sensor mounting point is as follows:
recording the steel structure in the middle of every two intersection points as a unit, and totaling m units;
the midpoint of the upper layer is denoted as a 0 A is arranged from left side to left end point in sequence 1 ，……，a n The method comprises the steps of carrying out a first treatment on the surface of the The midpoint of the lower layer is denoted as b 0 B is arranged from left side to left end point in sequence 1 ，……，b n The method comprises the steps of carrying out a first treatment on the surface of the The distance between the upper and lower points is denoted as c 0 C is arranged from left side to left end point in turn 1 ，……，c n The lengths are respectively y 0 ，……，y n ；
a 0 And a 1 The interval is denoted as a 01 As a first segment, the linear distance is denoted as x 1 ；a 1 And a 2 The interval is denoted as a 12 As a second segment, the linear distance is denoted as x 2 And so on; b 0 And b 1 The interval is denoted as b 01 As the first segment, the linear distance is denoted as x' 1 ；b 1 And b 2 The interval is denoted as b 12 As a second segment, the linear distance is denoted as x' 2 And so on;
distance a of upper layer 01 The included angle with the horizontal plane is recorded as theta 1 ，a 12 The included angle with the horizontal plane is recorded as theta 2 And so on; distance of lower layer b 01 The included angle between the water and the horizontal plane is recorded as theta' 1 ，b 12 The included angle between the water and the horizontal plane is recorded as theta' 2 And so on; structurally, θ i ＝θ′ i ；
Lower layer midpoint b 0 The height from the ground is recorded as h 0 ，b 1 The height from the ground is recorded as h 1 And so on; upper layer midpoint a 0 The height from the ground is h 0 +y 0 cosθ 0 ，a 1 The height from the ground is recorded as h 1 +y 1 cosθ 1 And so on;
the distance between the mounting point of the upper sensor of the ith section of the lower layer and the left end point of the bridge structure is recorded as l i ，l i The formula should be satisfied:
the distance between the mounting point of the upper sensor on the ith section of the upper layer and the left end point of the bridge structure is recorded as l' i ，l′ i The formula should be satisfied:
the left side and the right side of the structure are symmetrical, so that the sensors on the left side and the right side are symmetrically arranged;
the method comprises the following steps:
step 1: according to the characteristics of the steel structure of the beam bridge and the geographical position, the symmetry and the economical efficiency and effectiveness of monitoring are considered, the installation points of the distributed optical fiber strain sensor are selected,
step 2: each distributed optical fiber temperature sensor is parallel to the distributed optical fiber strain sensor, is arranged in the same groove and is connected end to form a distributed signal transmission line and is connected into the distributed optical fiber strain temperature demodulator,
step 3: the distributed optical fiber dynamic and static strain testing module sends instructions of dynamic and static strain to the distributed optical fiber strain temperature acquisition module, the acquired dynamic and static strain information is transmitted to the steel structure deformation monitoring and early warning and safety evaluating module,
step 4: the remote control room stores the collected data in the data storage platform, analyzes and processes the field data to form a safety monitoring report, further processes the result,
respectively comparing the strain data detected by the optical fiber strain sensor with the calculation results of dynamic and static strain formulas to judge whether the steel structure is in a normal strain state,
the dynamic strain calculation formula is:
the static strain calculation formula is:
in the steel pipe outer diameter D 2 mm, inner diameter D of steel tube 1 mm, wall thickness tmm, steel pipe length lmm, distance dmm between two intermediate intersection points, total number n of steel pipes, distance x between measuring point of installation sensor on ith unit and intersection point i mm，
If the data epsilon < epsilon detected by all the sensors max All are true, and the steel structure is in a normal strain state; if any one sensor detects data epsilon > epsilon max And if the steel structure is in an abnormal strain state, returning the detection result to the monitoring, early warning and safety evaluating system, sending an alarm signal when any one sensor detects the abnormal state, and evaluating the safety state of the beam bridge steel structure according to the feedback data at regular intervals according to actual needs.
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