CN114964456A - Beam bridge steel structure vibration safety monitoring system utilizing vehicle speed monitoring - Google Patents
Beam bridge steel structure vibration safety monitoring system utilizing vehicle speed monitoring Download PDFInfo
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- CN114964456A CN114964456A CN202210414536.2A CN202210414536A CN114964456A CN 114964456 A CN114964456 A CN 114964456A CN 202210414536 A CN202210414536 A CN 202210414536A CN 114964456 A CN114964456 A CN 114964456A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0008—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings of bridges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0066—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by exciting or detecting vibration or acceleration
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
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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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- Aviation & Aerospace Engineering (AREA)
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Abstract
The invention provides a beam bridge steel structure vibration safety monitoring system utilizing vehicle speed monitoring. The system comprises a sensor subsystem, a data acquisition and processing subsystem, a data transmission subsystem and an information analysis and monitoring early warning subsystem. The sensor subsystem is composed of a speed measurement sensor and a vibration measurement sensor, various signals are acquired by arranging the sensors at specific measurement points of the beam bridge steel structure, and then are transmitted to the information analysis and monitoring early warning subsystem through corresponding data processing to obtain a safety monitoring report, so that the result is displayed on the management platform. According to the invention, signals are acquired through specific sensor arrangement, and then corresponding algorithm processing is carried out, so that the vibration condition of the bridge can be preliminarily judged, and references are provided for subsequent evaluation of the health state of the beam bridge and maintenance work.
Description
Technical Field
The invention relates to the technical field of structure monitoring, in particular to a mode for monitoring vibration safety of a beam bridge steel structure.
Background
The steel structure assembly type building is a novel standardized and modular building system which is mainly characterized by taking a steel structure as a structural system and taking industrial production, assembly type construction, integrated decoration and informatization management of parts as main characteristics, has the advantages of high speed, high efficiency, less field operation, good earthquake resistance and the like, and is easy to realize the modernization and industrialization of the building industry. The vigorous development and popularization of steel structure assembly type buildings are already promoted to be the national policy and become the main direction of the development of the building industry in China at present.
In recent years, accidents such as collapse, fire and the like of a plurality of steel structure buildings occur in succession internationally and domestically, so that the development and application of the safety monitoring technology of the steel structure fabricated building are very important in the process of vigorously developing and popularizing the steel structure fabricated building. Although relevant national and industrial standards exist in the design, processing, installation and other processes of the steel structure assembly type building, at present, no safety monitoring technical system and standard of the building are formed from the systematic point of view, and related technical research and development and engineering application are few, even in a blank state. Therefore, the system researches and develops and applies and popularizes the related safety monitoring technology, which not only has great significance for building safety, but also is more beneficial to the application and popularization of various steel structure assembly type buildings.
Disclosure of Invention
The invention provides a beam bridge steel structure vibration safety monitoring system utilizing vehicle speed monitoring, which can obtain the vibration frequency of a bridge through data measured by a speed measuring sensor and a vibration measuring sensor, and preliminarily judge the vibration condition of the bridge, thereby judging whether the beam bridge is in a safety state or not.
In order to achieve the purpose, the beam bridge steel structure vibration safety monitoring system utilizing vehicle speed monitoring comprises a sensor subsystem, a data acquisition and processing subsystem, a data transmission subsystem and an information analysis and monitoring early warning subsystem;
the sensor subsystem, the data acquisition and processing subsystem, the data transmission subsystem and the information analysis and monitoring early warning subsystem are sequentially connected;
the sensor subsystem consists of a speed measuring sensor and a vibration measuring sensor;
the data acquisition and processing subsystem transmits the monitored data to the computer in real time through the data transmission subsystem, and the data is analyzed and processed by the network analyzer;
the information analysis and monitoring early warning subsystem consists of a high-performance computer platform, data analysis software, an expert analysis system and an alarm system.
The speed measurement sensors adopt photoelectric sensors, 2L/10 measuring points are arranged and are installed at the handrails on the two sides of the beam bridge, the sensors are spaced at the same distance and used for monitoring the speed of an automobile when the beam bridge runs, and L is the total length of the bridge.
The vibration measurement sensor is used for monitoring vibration signals of a bridge, 8i measuring points are arranged, sensor mounting points capable of reflecting the vibration condition of a structure are selected, and the method for calculating the mounting points of the vibration measurement sensor comprises the following steps:
note that the midpoint of the upper layer is a 0 From midpoint a 0 To the left side are a 1 ，......，a n ，a n Recording as the upper left endpoint; note down the midpoint of the layer as b 0 From the midpoint b 0 To the left side are b 1 ，......，b n ，b n Recording as a lower left endpoint; between the upper and lower points is denoted by c 0 From c 0 The points are c to the left 1 ，......，c n ，c n Marked as the left end point, length is y 0 ，......，y n ；
a 0 And a 1 Is marked with a 01 As a first segment, the straight-line distance is denoted as x 1 ；a 1 And a 2 Is marked with a 12 As a second segment, the linear distance is denoted by x 2 And so on; b 0 And b 1 Is marked with b 01 As the first segment, the straight-line distance is recorded as x' 1 ；b 1 And b 2 Is marked with b 12 As a second segment, the straight-line distance is denoted by x' 2 And so on;
upper layer distance a 01 The angle between the horizontal plane is denoted by θ 1 ，a 12 The angle between the horizontal plane is denoted by θ 2 And so on; lower layer distance b 01 Is recorded as theta 'from the horizontal plane' 1 ，b 12 Is recorded as theta 'from the horizontal plane' 2 And so on; from a structural point of view, theta i ＝θ′ i ；
Lower middle point b 0 Height from the ground is recorded as h 0 ，b 1 Height from ground is recorded as h 1 And so on; upper layer middle point a 0 The height from the ground is h 0 +y 0 cosθ 0 ，a 1 Height from the ground is recorded as h 1 +y 1 cosθ 1 And so on;
the distance between the sensor mounting point on the ith lower layer section and the lower left side end point of the bridge structure is recorded as l i ，l i The formula should be satisfied:
distance between a sensor mounting point on the ith section of the upper layer and an endpoint at the left upper side of the bridge structure is recorded as l' i ，l′ i The formula should be satisfied:
the structure is symmetrical on the left and the right sides, so that the sensors on the left and the right sides are symmetrically arranged.
Furthermore, according to the position of each sensor, a plurality of sensors are connected in series on the same optical fiber cable to form a distributed sensor network of a monitoring field, each sensor string is called as a channel, all the channels are collected to a data transceiver of the monitoring field, and the data transceiver is transmitted to a remote control room by using a main optical cable;
furthermore, the remote control room stores the acquired data in a data storage platform, analyzes and processes the field data to form a safety monitoring report, and further processes the result.
Further, according to the automobile speed monitored by a speed measuring sensor in the bridge, and according to the total mass of the automobile, the length and the aspect ratio of the bridge, the span of a bridge pier and other relevant data, the vibration state of the bridge steel structure can be judged by using a formula, wherein the formula is as follows:
wherein f is the vibration frequency of the bridge steel structure, m is the mass of the automobile, v is the speed of the automobile, L is the total length of the bridge, and L is j The bridge is a part of bridge pier span, N is the number of internal bridge piers, eta is the height-width ratio of the bridge, namely H/W, H is the height of the bridge, and W is the width of the bridge piers;
when the vibration frequency value f measured by the vibration measuring sensor n When the vibration is less than or equal to 1.2f, the vibration is in a reasonable range, and the bridge is in a normal state; when f is n When the frequency is more than 1.2f, the vibration amplitude of the structure is large, and the bridge is in a dangerous state.
And further, the detection result is returned to the monitoring and early warning subsystem, and an alarm signal is sent out when any sensor detects an abnormal state.
Drawings
FIG. 1 is a view of a layout of some of the sensor mounting points in the configuration of the present invention;
FIG. 2 is a flow chart of a monitoring method of the present invention;
the foregoing is merely illustrative of the structure of the present invention and various modifications or additions may be made to the specific structure described by those skilled in the art without departing from the structure or exceeding the scope of the invention as defined in the appended claims.
Claims (5)
1. The utility model provides an utilize beam bridge steel construction vibration safety monitoring system of vehicle speed monitoring which characterized in that, including: the system comprises a sensor subsystem, a data acquisition and processing subsystem, a data transmission subsystem and an information analysis and monitoring early warning subsystem;
the sensor subsystem consists of a speed measurement sensor and a vibration measurement sensor; the data acquisition and processing subsystem is connected with the sensor subsystem, acquires and processes data obtained by the sensor subsystem, and stores the data in a corresponding device; the data acquisition and processing subsystem is connected with the data transmission subsystem, transmits the acquired data to the information analysis and monitoring early warning subsystem through the data transmission subsystem for data analysis, further obtains a safety monitoring report, displays the processed data on the platform, and sends out an early warning signal when monitoring an abnormal vibration state.
2. The system for monitoring the vibration safety of the steel structure of the beam bridge by using the vehicle speed as claimed in claim 1, wherein the speed measurement sensor is a photoelectric sensor, 2L/10 measurement points are arranged and installed at the two side rails of the beam bridge, each sensor is spaced at the same distance for monitoring the speed of the vehicle when the beam bridge runs, wherein L is the total length of the bridge.
3. A beam bridge steel structure vibration safety monitoring system using vehicle speed monitoring as claimed in claim 1, characterized in that, the vibration measuring sensor is used to monitor the vibration signal of the bridge, 8i measuring points are arranged, the sensor mounting point capable of reflecting the vibration condition of the structure is selected, the method for calculating the vibration measuring sensor mounting point is as follows:
note that the midpoint of the upper layer is a 0 From midpoint a 0 To the left side are a 1 ，......，a n ，a n Recording as the upper left endpoint; note down the midpoint of the layer as b 0 From midpoint b 0 To the left side are b 1 ，......，b n ，b n Recording as a lower left endpoint; between the upper and lower pointsIs marked as c 0 From c 0 The points are c to the left side in sequence 1 ，......，c n ，c n Marked as the left end point and the length is y 0 ，......，y n ；
a 0 And a 1 Is marked with a 01 As a first segment, the straight-line distance is denoted as x 1 ；a 1 And a 2 Is marked with a 12 As a second segment, the linear distance is denoted as x 2 And so on; b 0 And b 1 Is marked with b 01 As the first segment, the straight-line distance is recorded as x' 1 ；b 1 And b 2 Is marked with b 12 As a second segment, the straight-line distance is denoted by x' 2 And so on;
upper layer distance a 01 The angle between the horizontal plane is denoted by θ 1 ，a 12 The angle between the horizontal plane is denoted by θ 2 And so on; lower layer distance b 01 Is recorded as theta 'from the horizontal plane' 1 ，b 12 Is recorded as theta 'from the horizontal plane' 2 And so on; from a structural point of view, theta i ＝θ′ i ；
Lower middle point b 0 Height from the ground is recorded as h 0 ，b 1 Height from the ground is recorded as h 1 And so on; upper layer middle point a 0 H from the ground 0 +y 0 cosθ 0 ，a 1 Height from the ground is recorded as h 1 +y 1 cosθ 1 And so on;
the distance between the sensor mounting point on the ith lower section and the left lower side end point of the bridge structure is recorded as l i ，l i The formula should be satisfied:
distance between a sensor mounting point on the ith section of the upper layer and an endpoint at the left upper side of the bridge structure is recorded as l' i ，l′ i The formula should be satisfied:
the structure is symmetrical on the left and right sides, so that the sensors on the left and right sides are symmetrically arranged.
4. A beam bridge steel structure vibration safety monitoring system using vehicle speed monitoring as claimed in claim 1, comprising the steps of:
step 1: selecting an installation point of a speed measuring sensor according to the structural characteristics of the beam bridge steel structure and the maximum monitoring range of the sensor;
step 2: selecting a mounting point of a vibration measuring sensor according to the steel structure characteristics and the geographical position of the beam bridge and considering the symmetry and the monitoring economy and effectiveness;
and step 3: according to the positions of the sensors, connecting a plurality of sensors on the same optical fiber cable in series to form a distributed sensor network of a monitoring field, wherein each sensor string is called as a channel, collecting all the channels to a data transceiver of the monitoring field, and transmitting the data transceiver to a remote control room by using a main optical cable;
and 4, step 4: the remote control room stores the acquired data in a data storage platform, analyzes and processes the field data to form a safety monitoring report, and further processes the result.
5. The system for monitoring the vibration safety of the steel structure of the beam bridge based on the vehicle speed as claimed in claim 1, wherein the vibration frequency of the steel structure of the bridge is obtained according to the total mass of the vehicle, the length and the aspect ratio of the bridge and the span of the bridge piers by the vehicle speed monitored by the speed sensor in the bridge, and then the vibration state of the bridge is judged by monitoring by the vibration measuring sensor; the calculation formula of the vibration frequency of the bridge steel structure is as follows:
wherein f is the vibration frequency of the bridge steel structure, m is the mass of the automobile, v is the speed of the automobile, L is the total length of the bridge, L j The bridge is a part of bridge pier span, N is the number of internal bridge piers, eta is the height-width ratio of the bridge, namely H/W, H is the height of the bridge, and W is the width of the bridge piers;
the vibration frequency f of the bridge steel structure calculated by the formula can be used for judging whether the beam bridge is in a normal vibration state; when the vibration frequency value f measured by the vibration measuring sensor n When the vibration is less than or equal to 1.2f, the vibration is in a reasonable range, and the bridge is in a normal state; when f is n When the frequency is more than 1.2f, the vibration amplitude of the structure is large, and the bridge is in a dangerous state; this provides a reference for evaluating the vibration state of the beam bridge and for maintenance work.
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