CN114813018A - Bridge impact coefficient measuring device and method - Google Patents
Bridge impact coefficient measuring device and method Download PDFInfo
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- CN114813018A CN114813018A CN202210748528.1A CN202210748528A CN114813018A CN 114813018 A CN114813018 A CN 114813018A CN 202210748528 A CN202210748528 A CN 202210748528A CN 114813018 A CN114813018 A CN 114813018A
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
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- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The invention relates to the technical field of bridge movement detection, in particular to a bridge impact coefficient measuring device and a method. Wherein, the collection vehicle runs on the bridge floor; the vibration acceleration detection mechanism is arranged on the acquisition vehicle and is used for detecting the vertical vibration acceleration of the acquisition vehicle; the laser displacement detection mechanism is arranged on the acquisition vehicle and used for detecting the relative displacement with the bridge deck; the position sensor is arranged on the collecting vehicle and used for detecting the static deflection of the bridge; and the analysis mechanism determines the impact coefficient of the bridge according to the vertical vibration acceleration of the collection vehicle, the static deflection of the bridge and the relative displacement with the bridge floor. The problem that the existing measuring mode needs to seal traffic when measuring, and a sensor is installed on a bridge, so that the measuring efficiency is low and the cost is high can be solved.
Description
Technical Field
The invention relates to the technical field of bridge movement detection, in particular to a device and a method for measuring a bridge impact coefficient.
Background
The bridge Impact coefficient (Impact Factor) is an important parameter for bridge design and evaluation, and is commonly used for describing and evaluating the Impact amplification degree of a bridge structure effect under the action of vehicle load. The impact coefficient is a product of coupled vibration of vehicle-road (surface) -bridge, and is comprehensively influenced by coupling effects of vehicle parameters (dynamic mass, suspension stiffness, wheel stiffness and the like), bridge parameters (span L, fundamental frequency and the like), road surface unevenness, vehicle speed and the like.
In engineering application, the bridge impact coefficient is mainly obtained by two methods. At present, in the prior art, corresponding impact coefficient specification calculation formulas are formulated on the basis of experiments, and the formulas are related to the bridge span L and the fundamental frequency f and are decreasing functions. The other method is to directly obtain the impact coefficient through a bridge field test, and mainly obtains the impact coefficient from a time course curve by measuring the dynamic deflection and dynamic strain time course curve of a bridge span (or a key component) under the action of a passing vehicle.
However, the former method only considers the influence of the bridge span and the fundamental frequency, but ignores the cross influence of the vehicle and the road surface unevenness, and cannot sufficiently reflect the real impact effect. The latter method can be closer to the actual situation, but the sensors are required to be installed on the bridge during measurement, the traffic is closed, and a special loading vehicle is required for loading, so that the efficiency is low, and the cost is high.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a bridge impact coefficient measuring device and method, which can solve the problems of low measuring efficiency and high measuring cost caused by the fact that the existing measuring mode needs to seal traffic and a sensor is installed on a bridge during measurement.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
the invention provides a bridge impact coefficient measuring device, comprising:
the collection vehicle is used for running on the bridge floor;
the vibration acceleration detection mechanism is arranged on the acquisition vehicle and used for detecting the vertical vibration acceleration of the acquisition vehicle when the acquisition vehicle runs;
the laser displacement detection mechanism is arranged on the acquisition vehicle and used for detecting the relative displacement between the acquisition vehicle and the bridge floor when the acquisition vehicle runs;
the position sensor is arranged on the collection vehicle and used for detecting the static deflection of the bridge when the collection vehicle runs;
and the analysis mechanism is used for determining the impact coefficient of the bridge according to the vertical vibration acceleration of the collection vehicle, the static deflection of the bridge and the relative displacement with the bridge floor.
In some optional schemes, the collecting trolley comprises an upper plate and a lower plate which are arranged at intervals, the upper plate and the lower plate are connected through a connecting column, the vibration acceleration detection mechanism is arranged on the lower plate close to one side of the upper plate, the laser displacement detection mechanism is arranged on the lower plate far away from one side of the upper plate, and the position sensor is arranged on the upper plate far away from one side of the lower plate.
In some optional schemes, the vibration acceleration detection mechanism and the laser displacement detection mechanism are both connected with the lower layer plate through the leveling bracket.
In some optional schemes, each leveling bracket comprises a leveling plate and at least three leveling bolts, and the leveling plate is connected with the lower plate through the leveling bolts.
In some optional schemes, the laser displacement detection mechanism includes two laser displacement sensing modules, and the two laser displacement sensing modules are arranged at intervals along the traveling direction of the collecting vehicle.
On the other hand, the invention also provides a bridge impact coefficient measuring method implemented by using the bridge impact coefficient measuring device, which comprises the following steps:
detecting the vertical vibration acceleration and the static deflection of the collection vehicle and the relative displacement between the collection vehicle and the bridge floor when the collection vehicle runs on the bridge floor;
and determining the impact coefficient of the bridge according to the vertical vibration acceleration of the collection vehicle, the static deflection of the bridge and the relative displacement with the bridge floor.
In some optional schemes, the determining the bridge impact coefficient according to the vertical vibration acceleration, the bridge static deflection and the relative displacement with the bridge deck of the collection vehicle comprises:
determining the vibration displacement of the bridge according to the vertical vibration acceleration of the collection vehicle and the relative displacement with the bridge deck;
determining dynamic deflection of the bridge according to the vibration displacement of the bridge and the static deflection of the bridge;
and determining the impact coefficient of the bridge according to the dynamic deflection of the bridge.
In some optional schemes, the determining the bridge vibration displacement according to the vertical vibration acceleration of the collection vehicle and the relative displacement with the bridge deck includes:
according to the formula
Determining
Vibration displacement of bridge at location
；
Wherein the content of the first and second substances,
is composed of
The position is used for collecting the relative displacement between the vehicle and the bridge floor,
is composed of
The vertical vibration acceleration of the vehicle is collected at the position,
in order to acquire the total suspension stiffness of the vehicle,mthe total weight of the vehicle body of the vehicle is collected.
In some optional solutions, the determining dynamic deflection of the bridge according to the vibration displacement of the bridge and the static deflection of the bridge includes:
according to the formula
Determining
Dynamic deflection of bridge at location
；
Wherein the content of the first and second substances,
is composed of
The vibration displacement of the bridge at the position,
is composed of
Static deflection of the bridge at the position.
In some optional solutions, the determining the bridge impact coefficient according to the dynamic deflection of the bridge includes:
according to the formula
Where max () represents the maximum value, | | represents the absolute value "
"means
All maxima in the array.
Compared with the prior art, the invention has the advantages that: the vertical vibration acceleration of the collection vehicle is detected by a vibration acceleration detection mechanism arranged on the collection vehicle when the collection vehicle runs on the bridge floor, and the relative displacement between the collection vehicle and the bridge floor is detected by a laser displacement detection mechanism when the collection vehicle runs; the position sensor detects and collects the static deflection of the bridge when the vehicle runs on the bridge floor, and then the vertical vibration acceleration, the static deflection of the bridge and the relative displacement between the collected vehicle and the bridge floor are utilized to determine the impact coefficient of the bridge. When the measurement mode is used for measurement, traffic does not need to be closed, and a sensor does not need to be installed on the bridge, so that the bridge impact coefficient can be measured, the measurement efficiency is improved, and the measurement cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a bridge impact coefficient measuring device according to an embodiment of the present invention;
FIG. 2 is a schematic view of the installation of the lower plate and the driving wheel in the embodiment of the present invention;
FIG. 3 is a schematic view showing the installation of the inspection apparatus on the lower plate according to the embodiment of the present invention;
FIG. 4 is a schematic diagram of a bridge impact coefficient measurement method according to an embodiment of the present invention.
In the figure: 1. a collection vehicle; 11. an upper plate; 12. a lower layer plate; 13. connecting columns; 14. a drive wheel; 15. a suspension spring; 16. a shaft; 2. a vibration acceleration detection mechanism; 3. a laser displacement detection mechanism; 4. a position sensor; 5. leveling the bracket; 51. leveling bolts; 52. leveling; 6. an analysis mechanism.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, the invention further provides a bridge impact coefficient measuring device, which comprises a collecting vehicle 1, a vibration acceleration detecting mechanism 2, a laser displacement detecting mechanism 3, a position sensor 4 and an analyzing mechanism 6.
The collection vehicle 1 is used for running on a bridge floor; the vibration acceleration detection mechanism 2 is arranged on the acquisition vehicle 1 and is used for detecting the vertical vibration acceleration of the acquisition vehicle 1 when the acquisition vehicle 1 runs; the laser displacement detection mechanism 3 is arranged on the acquisition vehicle 1 and used for detecting the relative displacement with the bridge floor when the acquisition vehicle 1 runs; the position sensor 4 is arranged on the collection vehicle 1 and used for detecting the static deflection of the bridge when the collection vehicle 1 runs; the analysis mechanism 6 is used for determining the impact coefficient of the bridge according to the vertical vibration acceleration of the collection vehicle 1, the static deflection of the bridge and the relative displacement between the collection vehicle and the bridge floor.
When the bridge impact coefficient measuring vehicle is used for detecting the bridge impact coefficient, the vertical vibration acceleration of the collecting vehicle 1 is detected by the vibration acceleration detecting mechanism 2 arranged on the collecting vehicle 1 when the collecting vehicle 1 runs on the bridge floor, and the relative displacement between the laser displacement detecting mechanism 3 and the bridge floor is detected when the collecting vehicle 1 runs on the bridge floor; the position sensor 4 detects the static deflection of the bridge when the collection vehicle 1 runs, and then the analysis mechanism 6 determines the impact coefficient of the bridge by using the vertical vibration acceleration, the static deflection of the bridge and the relative displacement with the bridge floor of the collection vehicle 1. The problems that the existing measuring mode needs to seal traffic when measuring, and a sensor is installed on a bridge, so that the measuring efficiency is low and the measuring cost is high are solved.
In some optional embodiments, the collecting vehicle 1 comprises an upper plate 11 and a lower plate 12 which are arranged at intervals, the upper plate 11 and the lower plate 12 are connected through a connecting column 13, the vibration acceleration detection mechanism 2 is arranged on the lower plate 12 close to one side of the upper plate 11, the laser displacement detection mechanism 3 is arranged on the lower plate 12 far away from one side of the upper plate 11, and the position sensor 4 is arranged on the upper plate 11 far away from one side of the lower plate 12.
In this embodiment, upper plate 11 and lower floor plate 12 connect through four spliced poles 13, set up position sensor 4 on upper plate 11, and position sensor 4 adopts GPS orientation module or big dipper orientation module, sets up position sensor 4 in upper plate 11's top, can conveniently receive satellite positioning signal, ensures the accuracy that detects.
In some optional embodiments, the laser displacement detection mechanism 3 includes two laser displacement sensing modules, and the two laser displacement sensing modules are arranged at intervals along the traveling direction of the collection vehicle 1.
The laser displacement detection mechanism 3 comprises two laser sensing modules arranged at intervals, is arranged at the bottom of the lower plate 12 and is arranged at intervals along the advancing direction of the collecting vehicle 1, and the average value of the two laser sensing modules is obtained when the relative displacement with the bridge floor is obtained.
The vibration acceleration detection mechanism 2 is arranged above the lower plate 12 and comprises at least one vibration acceleration sensor; in this example, two vibration acceleration sensors are provided, which can be used as backup for each other.
In this example, two vibration acceleration sensors respectively correspond to a laser sensing module, a laser sensing module and a vibration acceleration sensor form a detection complex, and the laser sensing module and the vibration acceleration sensor are respectively located on two sides of the lower plate 12, so that the arrangement is convenient to install.
As shown in fig. 2 and 3, in addition, in the present embodiment, the harvesting cart 1 includes two shafts 16 and four driving wheels 14, and each shaft 16 is connected to the lower deck 12 by two suspension springs 15.
The analysis mechanism 6 is provided on the upper plate 11. In other embodiments, the analysis mechanism 6 may also be in remote signal connection with the vibration acceleration detection mechanism 2, the laser displacement detection mechanism 3, and the position sensor 4, and is configured to receive data detected by the vibration acceleration detection mechanism 2, the laser displacement detection mechanism 3, and the position sensor 4, and perform analysis.
In some alternative embodiments, the vibration acceleration detection mechanism 2 and the laser displacement detection mechanism 3 are connected to the lower deck 12 through the leveling brackets 5.
In this embodiment, the vibration acceleration detection mechanism 2 and the laser displacement detection mechanism 3 are both connected with the lower plate 12 through the leveling bracket 5, and are used for leveling the vibration acceleration detection mechanism 2 and the laser displacement detection mechanism 3 before the collection vehicle 1 runs on the bridge floor, so as to avoid measurement errors.
In some alternative embodiments, the leveling brackets 5 each comprise: leveling plates 52 and at least three leveling bolts 51, wherein the leveling plates 52 are connected with the lower plate 12 through the leveling bolts 51.
In this embodiment, the vibration acceleration detection mechanism 2 and the laser displacement detection mechanism 3 are disposed on the leveling plate 52, the leveling bolt 51 is connected with the leveling plate 52 and the lower plate 12 in a threaded manner, and when the leveling plate 52 is leveled, the leveling of the leveling plate 52 can be realized by rotating the bolt, that is, the leveling of the vibration acceleration detection mechanism 2 and the laser displacement detection mechanism 3 is completed.
In another aspect, the present invention further provides a method for measuring an impact coefficient of a bridge, including the following steps:
s1: when the collection vehicle 1 runs on the bridge floor, the vertical vibration acceleration, the static deflection and the relative displacement with the bridge floor of the collection vehicle 1 are detected.
In the implementation, the vibration acceleration detection mechanism 2, the laser displacement detection mechanism 3 and the position sensor 4 which are arranged on the collection vehicle 1 are used for detecting the vertical vibration acceleration, the relative displacement with the bridge deck and the static deflection of the bridge of the collection vehicle 1 when the collection vehicle 1 runs, so as to prepare for subsequent calculation.
S2: and determining the impact coefficient of the bridge according to the vertical vibration acceleration of the collection vehicle 1, the static deflection of the bridge and the relative displacement with the bridge floor.
The method for measuring the bridge impact coefficient does not need to seal traffic and install a sensor on the bridge, and solves the problems of low measurement efficiency and high measurement cost caused by the fact that the existing measurement mode needs to seal traffic and install a sensor on the bridge during measurement.
In some optional embodiments, step S2 specifically includes:
s21: and determining the vibration displacement of the bridge according to the vertical vibration acceleration of the collection vehicle 1, the static deflection of the bridge and the relative displacement between the collection vehicle and the bridge floor.
In some alternative embodiments, the formula is based on
Determining
Vibration displacement of bridge at location
(ii) a Wherein the content of the first and second substances,
is composed of
The vertical displacement of the vehicle 1 is collected at the location,
is composed of
The vertical vibration acceleration of the vehicle 1 is acquired at the position,
in order to acquire the overall stiffness of the suspension of the vehicle 1,mfor collecting the total weight of the body of the vehicle 1.
In this example, the speed of the collection vehicle 1 is
The position of the collection vehicle 1 is far away from the beam end
，tFor acquiring the time, the position sensor 4 can also be used for detecting the position of the acquisition vehicle 1 when the acquisition vehicle runs on the bridge floor. In this example, the laser displacement detection mechanism 3 includes two laser sensing modules arranged at intervals and arranged at the bottom of the lower plate 12 and arranged at intervals along the advancing direction of the collecting vehicle 1, and the two laser sensing modules measure
The relative displacement data of the position acquisition vehicle 1 and the bridge floor are respectively
And
when the relative displacement with the bridge floor is taken, the average value of the data collected by the two laser sensing modules is taken
。
S22: and determining the dynamic deflection of the bridge according to the vibration displacement of the bridge and the static deflection of the bridge.
In some alternative embodiments, the formula is based on
Determining a bridge
Dynamic deflection of bridge at location
(ii) a Wherein the content of the first and second substances,
is composed of
The vibration displacement of the bridge at the position,
is composed of
Static deflection of the bridge at the position.
In this example, the dynamic deflection of the bridge can be determined by the static deflection of the bridge
And bridge vibration displacement
And (4) superposing to obtain the product.
S23: and determining the impact coefficient of the bridge according to the dynamic deflection of the bridge.
In some optional embodiments, determining the bridge impact coefficient according to the dynamic deflection of the bridge comprises: according to the formula
Where max () represents the maximum value, | | | represents the absolute value,“
"means
All maxima in the array.
As shown in fig. 4, the principle of the above method is as follows:
the span of the bridge is L, the section rigidity is EI, and the mass per unit length is M c . The speed of the collecting vehicle is
The position of the collection vehicle from the beam end is
Contact point of collection vehicle on axle
Is subjected to vertical vibration displacement of the bridge as
The vertical dynamic displacement of the collecting vehicle is
The road surface unevenness is
。
The collection vehicle can be simplified to a sprung mass according to the actual collection vehicle suspension, as shown in fig. 2 and 4, where m is the total weight of the vehicle body,
in order to acquire the total rigidity of the vehicle suspension,
the damping coefficient of the vehicle suspension is collected.
If the damping of the suspension of the collecting vehicle is not considered, the undamped inherent vibration equation of the system of the collecting vehicle is as follows:
wherein
Is the vertical vibration acceleration of the vehicle body.
The vertical vibration displacement of the bridge at the contact point of the collecting vehicle can be obtained by the above method
Comprises the following steps:
in the formula (I), the compound is shown in the specification,
in order to collect the instantaneous relative displacement between the vehicle and the road surface,
in order to collect the vertical displacement of the vehicle,
the road surface unevenness.
Bridge is on
Static deflection at a position of
Which is related to the inherent parameters of the bridge and the static load F,
wherein, in the step (A),
order of vibration mode of bridgeN is the total order of the mode of interest,
is the natural circular frequency of the bridge,
is a generalized deflection frequency that moves a constant force. The static deflection of the common bridge can be obtained by calculating and actually measuring the bridge, m is the total mass of the collection vehicle 1,vto acquire the speed of the vehicle 1, t is the time.
The dynamic deflection of the bridge can be determined by the static deflection of the bridge
And vertical vibration displacement of bridge
Stacking to obtain:
normalizing bridge impact coefficient
Is defined as:
in the formula (I), the compound is shown in the specification,
-is the maximum dynamic displacement amplitude;
the vertex value of the amplitude center track of the dynamic displacement waveform is obtained, or the vertex value is obtained through low-pass filtering;
-and
and (4) corresponding dynamic deflection valley value.
With respect to the present patent of the present invention,
where max () represents the maximum value, | | represents the absolute value;
wherein
To represent
All maxima in the array.
When the intrinsic parameters of the detection and acquisition vehicle and the intrinsic parameters of the bridge are both determined, the impact coefficient of the bridge is only equal to the unevenness of the external road surface
Vertical displacement of collecting vehicle
And collecting vehicle acceleration
The three are related.
The above equation can be written as:
from the above derivation, the bridge impact coefficient, the bridge span L, the moving force F, and the natural frequency of the bridge
Frequency of bending of moving constant force
Vertical displacement
And the quality of the collecting vehiclemSuspension stiffness
And collecting vertical acceleration of the vehicle
Unevenness of road surface
The parameters are related.
In summary, the vibration acceleration detection mechanism 2 arranged on the collection vehicle 1 detects the vertical vibration acceleration of the collection vehicle 1 when the collection vehicle 1 runs on the bridge floor, and the laser displacement detection mechanism 3 detects the relative displacement with the bridge floor when the collection vehicle 1 runs on the bridge floor; the position sensor 4 detects the static deflection of the bridge when the collection vehicle 1 runs, and then the analysis mechanism 6 determines the impact coefficient of the bridge by using the vertical vibration acceleration, the static deflection of the bridge and the relative displacement with the bridge floor of the collection vehicle 1. The problems that the existing measuring mode needs to seal traffic and a sensor is required to be installed on a bridge during measurement, so that the measuring efficiency is low and the measuring cost is high are solved.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A bridge impact coefficient measuring device, characterized by comprising:
a collection vehicle (1) for running on a bridge deck;
the vibration acceleration detection mechanism (2) is arranged on the acquisition vehicle (1) and is used for detecting the vertical vibration acceleration of the acquisition vehicle (1) when the acquisition vehicle (1) runs;
the laser displacement detection mechanism (3) is arranged on the acquisition vehicle (1) and is used for detecting the relative displacement between the acquisition vehicle (1) and the bridge floor when the acquisition vehicle runs;
the position sensor (4) is arranged on the acquisition vehicle (1) and is used for detecting the static deflection of the bridge when the acquisition vehicle (1) runs;
and the analysis mechanism (6) is used for determining the impact coefficient of the bridge according to the vertical vibration acceleration, the static deflection and the relative displacement of the bridge deck of the collection vehicle (1).
2. The bridge impact coefficient measuring device of claim 1, wherein: gather car (1) including upper plate (11) and lower floor plate (12) that the interval set up, upper plate (11) and lower floor plate (12) are connected through spliced pole (13), vibration acceleration detection mechanism (2) are located and are close to on lower floor plate (12) of upper plate (11) one side, laser displacement detection mechanism (3) are located and are kept away from on lower floor plate (12) of upper plate (11) one side, position sensor (4) are located and are kept away from on upper plate (11) of lower floor plate (12) one side.
3. The bridge impact coefficient measuring device of claim 2, wherein: the vibration acceleration detection mechanism (2) and the laser displacement detection mechanism (3) are connected with the lower floor plate (12) through the leveling support (5).
4. The bridge impact coefficient measuring device of claim 3, wherein: the leveling supports (5) comprise leveling plates (52) and at least three leveling bolts (51), and the leveling plates (52) are connected with the lower plate (12) through the leveling bolts (51).
5. The bridge impact coefficient measuring device of claim 1, wherein: the laser displacement detection mechanism (3) comprises two laser displacement sensing modules, and the two laser displacement sensing modules are arranged at intervals along the advancing direction of the collection vehicle (1).
6. A bridge impact coefficient measuring method implemented by the bridge impact coefficient measuring apparatus according to claim 1, comprising the steps of:
when the collection vehicle (1) runs on the bridge floor, detecting the vertical vibration acceleration and the static deflection of the bridge of the collection vehicle (1) and the relative displacement between the collection vehicle and the bridge floor;
and determining the impact coefficient of the bridge according to the vertical vibration acceleration of the collection vehicle (1), the static deflection of the bridge and the relative displacement with the bridge floor.
7. The bridge impact coefficient measuring method of claim 6, wherein: according to the vertical vibration acceleration, the static deflection and the relative displacement of the bridge deck of the collection vehicle (1), determining the impact coefficient of the bridge, comprising the following steps:
determining the vibration displacement of the bridge according to the vertical vibration acceleration of the collection vehicle (1) and the relative displacement with the bridge deck;
determining dynamic deflection of the bridge according to the vibration displacement of the bridge and the static deflection of the bridge;
and determining the impact coefficient of the bridge according to the dynamic deflection of the bridge.
8. The bridge impact coefficient measuring method of claim 7, wherein: according to the vertical vibration acceleration of gathering car (1) and with the relative displacement of bridge floor, confirm bridge vibration displacement, include:
according to the formula
Determining
Vibration displacement of bridge at location
；
Wherein the content of the first and second substances,
is composed of
The position collects the relative displacement between the vehicle (1) and the bridge floor,
is composed of
The vertical vibration acceleration of the vehicle (1) is collected at the position,
in order to acquire the total suspension stiffness of the vehicle (1),mthe total weight of the vehicle body of the vehicle (1) is collected.
9. The method for measuring the impact coefficient of the bridge according to claim 7, wherein the step of determining the dynamic deflection of the bridge according to the vibration displacement and the static deflection of the bridge comprises the following steps:
according to the formula
Determining
Dynamic deflection of bridge at location
；
Wherein the content of the first and second substances,
is composed of
Bridge at a locationThe vibration displacement is carried out, and the vibration displacement,
is composed of
Static deflection of the bridge at the position.
10. The method for measuring the impact coefficient of the bridge according to claim 7, wherein the step of determining the impact coefficient of the bridge according to the dynamic deflection of the bridge comprises the following steps:
according to the formula
Where max () represents the maximum value, | | represents the absolute value "
"means
All maxima in the array.
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| CN115793516A (en) * | 2022-11-02 | 2023-03-14 | 安徽源信技术有限公司 | Control system and method for intelligent bridge movement detection |
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