CN114417470A - Bridge crack safety evaluation method and device based on BIM - Google Patents
Bridge crack safety evaluation method and device based on BIM Download PDFInfo
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Abstract
The application discloses a bridge crack safety evaluation method and device based on BIM, wherein the method comprises the following steps: constructing a BIM (building information modeling) model aiming at a target bridge; acquiring a bridge reference model and a bridge damage model, performing modal analysis and static analysis, acquiring fundamental frequencies of the bridge reference model and the bridge damage model, acquiring maximum deflection of the bridge reference model and the bridge damage model under the same load, and acquiring the maximum deflection allowed by the bridge damage model under the same load; acquiring a deflection check coefficient, an overall stiffness check coefficient and a critical overall stiffness check coefficient; acquiring a health state evaluation score of a target bridge; acquiring a health evaluation grade of a target bridge; acquiring a crack safety state of a target bridge; the evaluation of the bridge crack safety state is standardized and visualized, so that the bridge can be overhauled and maintained in time.
Description
Technical Field
The application relates to the technical field of bridge crack safety evaluation, in particular to a BIM-based bridge crack safety evaluation method and device.
Background
Cracks are the most common diseases in concrete bridge structures, and the appearance of the cracks relates to the damage of structural appearances, the corrosion of stressed reinforcing steel bars and the loss of structural functions. The influence of cracks on the performance of the bridge is manifold, firstly, the influence on the service performance of the bridge reduces the rigidity of the bridge and further influences the normal use of the bridge, and the bearing capacity of the bridge is reduced due to the serious cracking problem, so that the safety performance of the bridge is influenced; secondly, directly reduce the durability and the service life of the bridge.
The traditional bridge crack detection method basically depends on manual inspection and manual disease judgment, and measures the geometric characteristics of the diseases such as cracks by using a conventional detection instrument, such as a crack width gauge, an ultrasonic detector, a skeleton bridge inspection vehicle and the like. The method is easily influenced by human subjective factors such as the technology and experience of test professionals, has low detection efficiency, and is difficult to adapt to the condition that the health state of modern bridge structures has more and complicated evaluation monitoring data.
Disclosure of Invention
In order to solve the problems that in the prior art, the safety evaluation of the bridge cracks depends on manual evaluation, so that the evaluation result is inaccurate and the evaluation standard is inconsistent, the application discloses a bridge crack safety evaluation method and device based on BIM.
The application discloses a BIM-based bridge crack safety evaluation method in a first aspect, which comprises the following steps:
aiming at a target bridge, acquiring structural information and crack information of the target bridge, and constructing a BIM (building information modeling);
acquiring a bridge reference finite element model and a bridge damage finite element model according to the BIM model;
setting gravity load and lane load according to the bridge reference finite element model and the bridge damage finite element model, and acquiring a bridge reference model and a bridge damage model;
performing modal analysis and static analysis on the bridge reference model and the bridge damage model to obtain fundamental frequencies of the bridge reference model and the bridge damage model, obtain maximum deflection of the bridge reference model and the bridge damage model under the same load, and obtain maximum deflection allowed by the bridge damage model under the same load;
obtaining a fundamental frequency check coefficient; the fundamental frequency check coefficient is the ratio of the fundamental frequency of the bridge damage model to the fundamental frequency of the bridge reference model;
acquiring a deflection check coefficient; the deflection check coefficient is the ratio of the maximum deflection of the bridge reference model and the bridge damage model under the same load;
acquiring an integral rigidity check coefficient; the integral rigidity check coefficient is the weighted sum of the fundamental frequency check coefficient and the deflection check coefficient, and the weighting coefficient is 0.5;
obtaining a critical overall stiffness check coefficient; the critical overall stiffness check coefficient is the ratio of the maximum deflection of the bridge reference model under the same load to the maximum deflection allowed by the bridge damage model;
acquiring a health state evaluation score of the target bridge according to the overall stiffness check coefficient, the critical overall stiffness check coefficient and a preset rule; the health state evaluation score of the target bridge is between 0 and 100;
acquiring a health evaluation grade of a target bridge; when the health evaluation coefficient of the target bridge is larger than 95 and smaller than or equal to 100, the state evaluation grade of the target bridge is first grade; when the health evaluation coefficient of the target bridge is greater than 80 and less than or equal to 95, the state evaluation grade of the target bridge is two-level; when the health evaluation coefficient of the target bridge is larger than 60 and smaller than or equal to 80, the state evaluation grade of the target bridge is three grades; when the health evaluation coefficient of the target bridge is larger than 40 and smaller than or equal to 60, the evaluation grade of the state of the target bridge is four; when the health evaluation coefficient of the target bridge is equal to or more than 0 and less than or equal to 40, the evaluation grade of the state of the target bridge is five;
acquiring a crack safety state of a target bridge; when the target bridge state evaluation grade is first grade, the crack safety state of the target bridge is evaluated to be a brand new state, and the using function of the bridge is not influenced; when the evaluation grade of the target bridge state is two-grade, the crack safety state of the target bridge is evaluated to be slightly defective, and the use function of the bridge is not affected; when the evaluation grade of the state of the target bridge is three, the crack safety state of the target bridge is evaluated as medium defect, and the normal use function of the bridge can be maintained; when the evaluation grade of the state of the target bridge is four, the crack safety state of the target bridge is evaluated to be a large defect, and the using function of the bridge is seriously influenced; and when the evaluation grade of the state of the target bridge is five, the crack safety state of the target bridge is evaluated to have serious defects, and the bridge cannot be normally used.
Optionally, the method further includes:
visualizing fracture safety status of a target bridge, comprising:
when the evaluation grade of the target bridge state is first grade, marking the bridge as bright red;
when the state evaluation grade of the target bridge is second grade, marking the bridge as dark red;
when the evaluation level of the target bridge state is three levels, marking the target bridge as a brown bridge;
when the evaluation grade of the state of the target bridge is four, marking the bridge as yellow;
and when the evaluation level of the target bridge state is five grades, marking the bridge as green.
Optionally, in the obtaining of the health status evaluation score of the target bridge according to the overall stiffness verification coefficient, the critical overall stiffness verification coefficient, and a preset rule, the preset rule is:
when the overall stiffness checking coefficient is equal to 1, the health state evaluation score of the target bridge is 100;
when the overall stiffness verification coefficient is equal to the critical overall stiffness verification coefficient, the health state evaluation score of the target bridge is 60;
and when the critical overall stiffness check coefficient is smaller than the overall stiffness check coefficient and smaller than 1, acquiring the health state evaluation score of the target bridge through a linear interpolation method.
Optionally, the obtaining of the fundamental frequency check coefficient is obtained according to the following formula:
wherein ξfIs a fundamental frequency check coefficient, faIs the fundamental frequency, f, of the bridge damage modelpThe fundamental frequency of the bridge reference model.
Optionally, the obtained deflection verification coefficient is obtained according to the following formula:
wherein ξγIs a deflection checking coefficient, gammapThe maximum deflection, gamma, of a bridge damage model under the same loadaThe maximum deflection of the bridge reference model under the same load is obtained.
Optionally, the obtaining of the overall stiffness verification coefficient is obtained according to the following formula:
ξw＝0.5ξf+0.5ξγ；
wherein ξwIs a whole rigidity check coefficient, xifIs a fundamental frequency check coefficient, xiγFor correcting deflectionAnd (5) testing the coefficient.
Optionally, the obtaining of the critical global stiffness verification coefficient is obtained according to the following formula:
wherein ξw0Is a critical global stiffness check coefficient, gammapThe maximum deflection, gamma, of a bridge damage model under the same loadmaxThe maximum deflection allowed by the bridge damage model under the same load.
Optionally, the method includes the steps of setting a gravity load and a lane load according to the bridge reference finite element model and the bridge damage finite element model, and acquiring the bridge reference model and the bridge damage model, including:
and setting the unit type, the material property, the grid type, the boundary constraint condition, the gravity load and the lane load of the bridge reference finite element model and the bridge damage finite element model to obtain the bridge reference model and the bridge damage model.
The second aspect of the application discloses a bridge crack safety evaluation device based on BIM, which is applied to the bridge crack safety evaluation method based on BIM, and comprises the following steps:
the BIM model building module is used for obtaining the structural information and the crack information of the target bridge aiming at the target bridge and building a BIM model;
the finite element model construction module is used for acquiring a bridge reference finite element model and a bridge damage finite element model according to the BIM model;
the model construction module is used for setting gravity load and lane load according to the bridge reference finite element model and the bridge damage finite element model and acquiring a bridge reference model and a bridge damage model;
the data acquisition module is used for carrying out modal analysis and static analysis on the bridge benchmark model and the bridge damage model, acquiring fundamental frequencies of the bridge benchmark model and the bridge damage model, acquiring maximum deflection of the bridge benchmark model and the bridge damage model under the same load, and acquiring the maximum deflection allowed by the bridge damage model under the same load;
the first data calculation module is used for acquiring a fundamental frequency check coefficient; the fundamental frequency check coefficient is the ratio of the fundamental frequency of the bridge damage model to the fundamental frequency of the bridge reference model;
the second data calculation module is used for acquiring a deflection check coefficient; the deflection check coefficient is the ratio of the maximum deflection of the bridge reference model and the bridge damage model under the same load;
the third data calculation module is used for acquiring the overall rigidity check coefficient; the integral rigidity check coefficient is the weighted sum of the fundamental frequency check coefficient and the deflection check coefficient, and the weighting coefficient is 0.5;
the fourth data calculation module is used for acquiring a critical overall stiffness check coefficient; the critical overall stiffness check coefficient is the ratio of the maximum deflection of the bridge reference model under the same load to the maximum deflection allowed by the bridge damage model;
the health state score acquisition module is used for acquiring a health state evaluation score of the target bridge according to the overall stiffness check coefficient, the critical overall stiffness check coefficient and a preset rule; the health state evaluation score of the target bridge is between 0 and 100;
the health state grade evaluation module is used for acquiring the health evaluation grade of the target bridge; when the health evaluation coefficient of the target bridge is larger than 95 and smaller than or equal to 100, the state evaluation grade of the target bridge is first grade; when the health evaluation coefficient of the target bridge is greater than 80 and less than or equal to 95, the state evaluation grade of the target bridge is two-level; when the health evaluation coefficient of the target bridge is larger than 60 and smaller than or equal to 80, the state evaluation grade of the target bridge is three grades; when the health evaluation coefficient of the target bridge is larger than 40 and smaller than or equal to 60, the evaluation grade of the state of the target bridge is four; when the health evaluation coefficient of the target bridge is equal to or more than 0 and less than or equal to 40, the evaluation grade of the state of the target bridge is five;
the crack safety state evaluation module is used for acquiring the crack safety state of the target bridge; when the target bridge state evaluation grade is first grade, the crack safety state of the target bridge is evaluated to be a brand new state, and the using function of the bridge is not influenced; when the evaluation grade of the target bridge state is two-grade, the crack safety state of the target bridge is evaluated to be slightly defective, and the use function of the bridge is not affected; when the evaluation grade of the state of the target bridge is three, the crack safety state of the target bridge is evaluated as medium defect, and the normal use function of the bridge can be maintained; when the evaluation grade of the state of the target bridge is four, the crack safety state of the target bridge is evaluated to be a large defect, and the using function of the bridge is seriously influenced; and when the evaluation grade of the state of the target bridge is five, the crack safety state of the target bridge is evaluated to have serious defects, and the bridge cannot be normally used.
Optionally, the apparatus further includes a visualization module, configured to visualize the fracture safety status of the target bridge, including:
the first color marking unit is used for marking the bridge as bright red when the evaluation grade of the state of the target bridge is first grade;
the second color marking unit is used for marking the bridge as dark red when the evaluation grade of the state of the target bridge is two levels;
the third color marking unit is used for marking the target bridge as brown when the evaluation level of the state of the target bridge is three levels;
the fourth color marking unit is used for marking the bridge as yellow when the evaluation level of the target bridge state is four levels;
and the fifth color marking unit is used for marking the bridge as green when the evaluation level of the target bridge state is five.
The application discloses a bridge crack safety evaluation method and device based on BIM, wherein the method comprises the following steps: constructing a BIM (building information modeling) model aiming at a target bridge; acquiring a bridge reference finite element model and a bridge damage finite element model; acquiring a bridge reference model and a bridge damage model; performing modal analysis and static analysis on the bridge reference model and the bridge damage model to obtain fundamental frequencies of the bridge reference model and the bridge damage model, obtain maximum deflection of the bridge reference model and the bridge damage model under the same load, and obtain maximum deflection allowed by the bridge damage model under the same load; acquiring a deflection check coefficient, an overall stiffness check coefficient and a critical overall stiffness check coefficient; acquiring a health state evaluation score of a target bridge; acquiring a health evaluation grade of a target bridge; and acquiring the crack safety state of the target bridge.
The bridge structure health state can be mastered in time, the whole process of the change of the bridge structure state can be tracked, and the evaluation of the bridge crack safety state is standardized and visualized, so that the bridge can be overhauled and maintained in time, and the damage to manpower and financial resources is reduced.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a bridge crack safety evaluation method based on BIM disclosed in an embodiment of the present application.
Detailed Description
In order to solve the problems that in the prior art, the safety evaluation of the bridge cracks depends on manual evaluation, so that the evaluation result is inaccurate and the evaluation standard is inconsistent, the application discloses a bridge crack safety evaluation method and device based on BIM.
The first embodiment of the application discloses a bridge crack safety evaluation method based on BIM, which is shown in a flow diagram of FIG. 1 and comprises the following steps:
And 102, acquiring a bridge reference finite element model and a bridge damage finite element model according to the BIM model. Since each crack is directly dug in the BIM according to the information of the shape, the length, the width, the depth and the like, the geometric entity is actually modified, so that the crack is converted into the geometric entity with the crack in the finite element model, and the crack information is transferred without damage along with the conversion of the geometric entity.
The problem that the BIM information model lacks effective structural safety analysis in the operation and maintenance process of the bridge is solved by converting the BIM information model of the bridge into the corresponding finite element model, the advantages of visualization, coordination and simulation of the BIM technology are combined with the calculation advantages of finite element analysis software, and reliable bridge safety assessment function and convenient visual experience are provided for the operation and maintenance of the bridge.
And 103, setting gravity load and lane load according to the bridge reference finite element model and the bridge damage finite element model, and obtaining a bridge reference model and a bridge damage model.
And 104, performing modal analysis and static analysis on the bridge reference model and the bridge damage model, acquiring fundamental frequencies of the bridge reference model and the bridge damage model, acquiring maximum deflection of the bridge reference model and the bridge damage model under the same load, and acquiring the maximum deflection allowed by the bridge damage model under the same load.
And 105, acquiring a fundamental frequency check coefficient. The fundamental frequency check coefficient is the ratio of the fundamental frequency of the bridge damage model and the fundamental frequency of the bridge reference model.
And step 106, acquiring a deflection check coefficient. And the deflection check coefficient is the ratio of the maximum deflection of the bridge reference model and the bridge damage model under the same load.
And step 107, acquiring the overall rigidity check coefficient. The integral rigidity check coefficient is the weighted sum of the fundamental frequency check coefficient and the deflection check coefficient, and the weighting coefficient is 0.5.
And step 108, acquiring a critical overall stiffness check coefficient. The critical overall stiffness check coefficient is the ratio of the maximum deflection of the bridge reference model under the same load to the maximum deflection allowed by the bridge damage model.
And step 109, acquiring a health state evaluation score of the target bridge according to the overall stiffness check coefficient, the critical overall stiffness check coefficient and a preset rule. The health status assessment score of the target bridge is between 0 and 100.
And step 110, acquiring the health evaluation grade of the target bridge. And when the health evaluation coefficient of the target bridge is greater than 95 and less than or equal to 100, the state evaluation grade of the target bridge is first grade. And when the health evaluation coefficient of the target bridge is greater than 80 and less than or equal to 95, the evaluation grade of the state of the target bridge is two grades. And when the health evaluation coefficient of the target bridge is larger than 60 and smaller than or equal to 80, the evaluation grade of the state of the target bridge is three. And when the health evaluation coefficient of the target bridge is larger than 40 and smaller than or equal to 60, the evaluation grade of the state of the target bridge is four. And when the health evaluation coefficient of the target bridge is equal to or more than 0 and less than or equal to 40, the evaluation grade of the state of the target bridge is five.
And step 111, acquiring the crack safety state of the target bridge. When the target bridge state evaluation grade is first grade, the crack safety state of the target bridge is evaluated to be a brand new state, and the using function of the bridge is not influenced. And when the evaluation grade of the target bridge state is second grade, the crack safety state of the target bridge is evaluated to be slightly defective, and the use function of the bridge is not influenced. When the evaluation grade of the state of the target bridge is three grades, the crack safety state of the target bridge is evaluated as medium defect, and the normal use function of the bridge can be maintained. When the evaluation grade of the state of the target bridge is four, the crack safety state of the target bridge is evaluated to have a large defect, and the service function of the bridge is seriously influenced. And when the evaluation grade of the state of the target bridge is five, the crack safety state of the target bridge is evaluated to have serious defects, and the bridge cannot be normally used.
Visualizing fracture safety status of a target bridge, comprising:
and when the evaluation level of the target bridge state is first grade, marking the bridge as bright red.
And when the evaluation level of the target bridge state is two levels, marking the bridge as dark red.
When the target bridge state rating is three, the bridge is marked as brown.
When the target bridge state rating is four, the mark is yellow.
And when the evaluation level of the target bridge state is five grades, marking the bridge as green.
The application discloses a bridge crack safety evaluation method and device based on BIM, wherein the method comprises the following steps: constructing a BIM (building information modeling) model aiming at a target bridge; acquiring a bridge reference finite element model and a bridge damage finite element model; acquiring a bridge reference model and a bridge damage model; performing modal analysis and static analysis on the bridge reference model and the bridge damage model to obtain fundamental frequencies of the bridge reference model and the bridge damage model, obtain maximum deflection of the bridge reference model and the bridge damage model under the same load, and obtain maximum deflection allowed by the bridge damage model under the same load; acquiring a deflection check coefficient, an overall stiffness check coefficient and a critical overall stiffness check coefficient; acquiring a health state evaluation score of a target bridge; acquiring a health evaluation grade of a target bridge; and acquiring the crack safety state of the target bridge.
The bridge structure health state can be mastered in time, the whole process of the change of the bridge structure state can be tracked, and the evaluation of the bridge crack safety state is standardized and visualized, so that the bridge can be overhauled and maintained in time, and the damage to manpower and financial resources is reduced.
Further, in the obtaining of the health status evaluation score of the target bridge according to the overall stiffness verification coefficient, the critical overall stiffness verification coefficient, and a preset rule, the preset rule is:
and when the overall rigidity checking coefficient is equal to 1, the health state evaluation score of the target bridge is 100.
And when the overall stiffness verification coefficient is equal to the critical overall stiffness verification coefficient, the health state evaluation score of the target bridge is 60.
And when the critical overall stiffness check coefficient is smaller than the overall stiffness check coefficient and smaller than 1, acquiring the health state evaluation score of the target bridge through a linear interpolation method.
Further, the obtaining of the fundamental frequency check coefficient is obtained according to the following formula:
wherein ξfIs a fundamental frequency check coefficient, faIs the fundamental frequency, f, of the bridge damage modelpThe fundamental frequency of the bridge reference model.
Further, the obtained deflection check coefficient is obtained according to the following formula:
wherein ξγIs a deflection checking coefficient, gammapThe maximum deflection, gamma, of a bridge damage model under the same loadaThe maximum deflection of the bridge reference model under the same load is obtained.
Further, the obtaining of the overall stiffness verification coefficient is obtained according to the following formula:
ξw＝0.5ξf+0.5ξγ。
wherein ξwIs a whole rigidity check coefficient, xifIs a fundamental frequency check coefficient, xiγAnd the deflection check coefficient.
Further, the obtaining of the critical global stiffness verification coefficient is obtained according to the following formula:
wherein ξw0Is a critical global stiffness check coefficient, gammapThe maximum deflection, gamma, of a bridge damage model under the same loadmaxThe maximum deflection allowed by the bridge damage model under the same load.
Further, according to the bridge benchmark finite element model and the bridge damage finite element model, setting gravity load and lane load, obtaining the bridge benchmark model and the bridge damage model, including:
and setting the unit type, the material property, the grid type, the boundary constraint condition, the gravity load and the lane load of the bridge reference finite element model and the bridge damage finite element model to obtain the bridge reference model and the bridge damage model. The bridge reference finite element model and the bridge damage finite element model are obtained through the model conversion, and the steps of modeling and the like in finite element analysis are omitted. Note that the so-called finite element model obtained by conversion here is actually only a geometric model in which the element type and material properties are not defined and meshing is not performed, and it is necessary to perform necessary processing to load and calculate the geometric model, so that the finite element model obtained by conversion needs to be completed.
First the cell type and material properties need to be defined. And then controlling the shape of the unit, selecting the type of the grid, and dividing a geometric model by adopting the grid. And finally applying boundary constraint conditions.
The bridge is then loaded. Gravity is first added in a manner that adds an inertial force, noting that the direction of gravity is opposite to the direction of the inertial force. The lane load is then added. In addition to lane loads, automotive loads also include vehicle loads. The lane load is adopted for the whole calculation of the bridge structure, and the vehicle load is adopted for the local loading of the bridge structure and the calculation of the soil pressure caused by the automobile behind the culvert abutment, the soil pressure caused by the automobile on the retaining wall and the like. The effects of lane load and vehicle load cannot be superimposed. Since the evaluation of the health state of the bridge is to evaluate the whole structure, the lane load is added.
The bridge health state grading is beneficial to building a bridge multilevel early warning system, a visual integration and sharing platform which can integrate information from multiple users, multiple stages and multiple services is provided by the BIM technology, and a user can extract monitoring data information in the authority range of the user at any time at a three-dimensional model end according to a retrieval or pickup function. When the early warning threshold index alarm is triggered, the alarm position is located in real time through the BIM + GIS function, the alarm type is indicated through special effects of flame, smoke, flash and the like, and a manager is intuitively prompted to deal with the alarm.
The second embodiment of the application discloses a bridge crack safety evaluation device based on BIM, which is applied to the bridge crack safety evaluation method based on BIM and comprises the following steps:
and the BIM model building module is used for acquiring the structural information and the crack information of the target bridge aiming at the target bridge and building the BIM model.
And the finite element model construction module is used for acquiring a bridge reference finite element model and a bridge damage finite element model according to the BIM model.
And the model construction module is used for setting gravity load and lane load according to the bridge reference finite element model and the bridge damage finite element model, and acquiring the bridge reference model and the bridge damage model.
And the data acquisition module is used for carrying out modal analysis and static analysis on the bridge benchmark model and the bridge damage model, acquiring fundamental frequencies of the bridge benchmark model and the bridge damage model, acquiring maximum deflection of the bridge benchmark model and the bridge damage model under the same load, and acquiring the maximum deflection allowed by the bridge damage model under the same load.
And the first data calculation module is used for acquiring the fundamental frequency check coefficient. The fundamental frequency check coefficient is the ratio of the fundamental frequency of the bridge damage model and the fundamental frequency of the bridge reference model.
And the second data calculation module is used for acquiring the deflection check coefficient. And the deflection check coefficient is the ratio of the maximum deflection of the bridge reference model and the bridge damage model under the same load.
And the third data calculation module is used for acquiring the overall rigidity check coefficient. The integral rigidity check coefficient is the weighted sum of the fundamental frequency check coefficient and the deflection check coefficient, and the weighting coefficient is 0.5.
And the fourth data calculation module is used for acquiring the critical overall stiffness check coefficient. The critical overall stiffness check coefficient is the ratio of the maximum deflection of the bridge reference model under the same load to the maximum deflection allowed by the bridge damage model.
And the health state score acquisition module is used for acquiring the health state evaluation score of the target bridge according to the overall stiffness check coefficient, the critical overall stiffness check coefficient and a preset rule. The health status assessment score of the target bridge is between 0 and 100.
And the health state grade evaluation module is used for acquiring the health evaluation grade of the target bridge. And when the health evaluation coefficient of the target bridge is greater than 95 and less than or equal to 100, the state evaluation grade of the target bridge is first grade. And when the health evaluation coefficient of the target bridge is greater than 80 and less than or equal to 95, the evaluation grade of the state of the target bridge is two grades. And when the health evaluation coefficient of the target bridge is larger than 60 and smaller than or equal to 80, the evaluation grade of the state of the target bridge is three. And when the health evaluation coefficient of the target bridge is larger than 40 and smaller than or equal to 60, the evaluation grade of the state of the target bridge is four. And when the health evaluation coefficient of the target bridge is equal to or more than 0 and less than or equal to 40, the evaluation grade of the state of the target bridge is five.
And the crack safety state evaluation module is used for acquiring the crack safety state of the target bridge. When the target bridge state evaluation grade is first grade, the crack safety state of the target bridge is evaluated to be a brand new state, and the using function of the bridge is not influenced. And when the evaluation grade of the target bridge state is second grade, the crack safety state of the target bridge is evaluated to be slightly defective, and the use function of the bridge is not influenced. When the evaluation grade of the state of the target bridge is three grades, the crack safety state of the target bridge is evaluated as medium defect, and the normal use function of the bridge can be maintained. When the evaluation grade of the state of the target bridge is four, the crack safety state of the target bridge is evaluated to have a large defect, and the service function of the bridge is seriously influenced. And when the evaluation grade of the state of the target bridge is five, the crack safety state of the target bridge is evaluated to have serious defects, and the bridge cannot be normally used.
Further, the apparatus further includes a visualization module for visualizing the fracture safety status of the target bridge, including:
and the first color marking unit is used for marking the bridge as bright red when the evaluation level of the target bridge state is first grade.
And the second color marking unit is used for marking the bridge as dark red when the target bridge state evaluation level is two levels.
And the third color marking unit is used for marking the bridge as brown when the target bridge state evaluation level is three levels.
And the fourth color marking unit is used for marking the bridge as yellow when the target bridge state evaluation level is four.
And the fifth color marking unit is used for marking the bridge as green when the evaluation level of the target bridge state is five. The present application has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to limit the application. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the presently disclosed embodiments and implementations thereof without departing from the spirit and scope of the present disclosure, and these fall within the scope of the present disclosure. The protection scope of this application is subject to the appended claims.
Claims (10)
1. A bridge crack safety evaluation method based on BIM is characterized by comprising the following steps:
aiming at a target bridge, acquiring structural information and crack information of the target bridge, and constructing a BIM (building information modeling);
acquiring a bridge reference finite element model and a bridge damage finite element model according to the BIM model;
setting gravity load and lane load according to the bridge reference finite element model and the bridge damage finite element model, and acquiring a bridge reference model and a bridge damage model;
performing modal analysis and static analysis on the bridge reference model and the bridge damage model to obtain fundamental frequencies of the bridge reference model and the bridge damage model, obtain maximum deflection of the bridge reference model and the bridge damage model under the same load, and obtain maximum deflection allowed by the bridge damage model under the same load;
obtaining a fundamental frequency check coefficient; the fundamental frequency check coefficient is the ratio of the fundamental frequency of the bridge damage model to the fundamental frequency of the bridge reference model;
acquiring a deflection check coefficient; the deflection check coefficient is the ratio of the maximum deflection of the bridge reference model and the bridge damage model under the same load;
acquiring an integral rigidity check coefficient; the integral rigidity check coefficient is the weighted sum of the fundamental frequency check coefficient and the deflection check coefficient, and the weighting coefficient is 0.5;
obtaining a critical overall stiffness check coefficient; the critical overall stiffness check coefficient is the ratio of the maximum deflection of the bridge reference model under the same load to the maximum deflection allowed by the bridge damage model;
acquiring a health state evaluation score of the target bridge according to the overall stiffness check coefficient, the critical overall stiffness check coefficient and a preset rule; the health state evaluation score of the target bridge is between 0 and 100;
acquiring a health evaluation grade of a target bridge; when the health evaluation coefficient of the target bridge is larger than 95 and smaller than or equal to 100, the state evaluation grade of the target bridge is first grade; when the health evaluation coefficient of the target bridge is greater than 80 and less than or equal to 95, the state evaluation grade of the target bridge is two-level; when the health evaluation coefficient of the target bridge is larger than 60 and smaller than or equal to 80, the state evaluation grade of the target bridge is three grades; when the health evaluation coefficient of the target bridge is larger than 40 and smaller than or equal to 60, the evaluation grade of the state of the target bridge is four; when the health evaluation coefficient of the target bridge is equal to or more than 0 and less than or equal to 40, the evaluation grade of the state of the target bridge is five;
acquiring a crack safety state of a target bridge; when the target bridge state evaluation grade is first grade, the crack safety state of the target bridge is evaluated to be a brand new state, and the using function of the bridge is not influenced; when the evaluation grade of the target bridge state is two-grade, the crack safety state of the target bridge is evaluated to be slightly defective, and the use function of the bridge is not affected; when the evaluation grade of the state of the target bridge is three, the crack safety state of the target bridge is evaluated as medium defect, and the normal use function of the bridge can be maintained; when the evaluation grade of the state of the target bridge is four, the crack safety state of the target bridge is evaluated to be a large defect, and the using function of the bridge is seriously influenced; and when the evaluation grade of the state of the target bridge is five, the crack safety state of the target bridge is evaluated to have serious defects, and the bridge cannot be normally used.
2. The BIM-based bridge crack safety assessment method according to claim 1, further comprising:
visualizing fracture safety status of a target bridge, comprising:
when the evaluation grade of the target bridge state is first grade, marking the bridge as bright red;
when the state evaluation grade of the target bridge is second grade, marking the bridge as dark red;
when the evaluation level of the target bridge state is three levels, marking the target bridge as a brown bridge;
when the evaluation grade of the state of the target bridge is four, marking the bridge as yellow;
and when the evaluation level of the target bridge state is five grades, marking the bridge as green.
3. The BIM-based bridge crack safety assessment method according to claim 1, wherein the health status assessment score of the target bridge is obtained according to the global stiffness verification coefficient, the critical global stiffness verification coefficient and a preset rule, wherein the preset rule is as follows:
when the overall stiffness checking coefficient is equal to 1, the health state evaluation score of the target bridge is 100;
when the overall stiffness verification coefficient is equal to the critical overall stiffness verification coefficient, the health state evaluation score of the target bridge is 60;
and when the critical overall stiffness check coefficient is smaller than the overall stiffness check coefficient and smaller than 1, acquiring the health state evaluation score of the target bridge through a linear interpolation method.
4. The BIM-based bridge crack safety assessment method according to claim 1, wherein the fundamental frequency check coefficient is obtained according to the following formula:
wherein ξfIs the fundamental frequency check coefficient, is the fundamental frequency of the bridge damage model, fpThe fundamental frequency of the bridge reference model.
5. The BIM-based bridge crack safety assessment method according to claim 1, wherein the obtained deflection check coefficient is obtained according to the following formula:
wherein ξγIs a deflection checking coefficient, gammapThe maximum deflection, gamma, of a bridge damage model under the same loadaThe maximum deflection of the bridge reference model under the same load is obtained.
6. The BIM-based bridge crack safety assessment method according to claim 1, wherein the overall stiffness verification coefficient is obtained according to the following formula:
ξw＝0.5ξf+0.5ξγ；
wherein ξwIs a whole rigidity check coefficient, xifIs a fundamental frequency check coefficient, xiγAnd the deflection check coefficient.
7. The BIM-based bridge crack safety assessment method according to claim 1, wherein the critical global stiffness check coefficient is obtained according to the following formula:
wherein ξw0Is a critical global stiffness check coefficient, gammapThe maximum deflection, gamma, of a bridge damage model under the same loadmaxThe maximum deflection allowed by the bridge damage model under the same load.
8. The BIM-based bridge crack safety assessment method according to claim 1, wherein the step of obtaining the bridge reference model and the bridge damage model by setting gravity load and lane load according to the bridge reference finite element model and the bridge damage finite element model comprises:
and setting the unit type, the material property, the grid type, the boundary constraint condition, the gravity load and the lane load of the bridge reference finite element model and the bridge damage finite element model to obtain the bridge reference model and the bridge damage model.
9. A BIM-based bridge crack safety assessment device applied to the BIM-based bridge crack safety assessment method of any one of claims 1 to 8, comprising:
the BIM model building module is used for obtaining the structural information and the crack information of the target bridge aiming at the target bridge and building a BIM model;
the finite element model construction module is used for acquiring a bridge reference finite element model and a bridge damage finite element model according to the BIM model;
the model construction module is used for setting gravity load and lane load according to the bridge reference finite element model and the bridge damage finite element model and acquiring a bridge reference model and a bridge damage model;
the data acquisition module is used for carrying out modal analysis and static analysis on the bridge benchmark model and the bridge damage model, acquiring fundamental frequencies of the bridge benchmark model and the bridge damage model, acquiring maximum deflection of the bridge benchmark model and the bridge damage model under the same load, and acquiring the maximum deflection allowed by the bridge damage model under the same load;
the first data calculation module is used for acquiring a fundamental frequency check coefficient; the fundamental frequency check coefficient is the ratio of the fundamental frequency of the bridge damage model to the fundamental frequency of the bridge reference model;
the second data calculation module is used for acquiring a deflection check coefficient; the deflection check coefficient is the ratio of the maximum deflection of the bridge reference model and the bridge damage model under the same load;
the third data calculation module is used for acquiring the overall rigidity check coefficient; the integral rigidity check coefficient is the weighted sum of the fundamental frequency check coefficient and the deflection check coefficient, and the weighting coefficient is 0.5;
the fourth data calculation module is used for acquiring a critical overall stiffness check coefficient; the critical overall stiffness check coefficient is the ratio of the maximum deflection of the bridge reference model under the same load to the maximum deflection allowed by the bridge damage model;
the health state score acquisition module is used for acquiring a health state evaluation score of the target bridge according to the overall stiffness check coefficient, the critical overall stiffness check coefficient and a preset rule; the health state evaluation score of the target bridge is between 0 and 100;
the health state grade evaluation module is used for acquiring the health evaluation grade of the target bridge; when the health evaluation coefficient of the target bridge is larger than 95 and smaller than or equal to 100, the state evaluation grade of the target bridge is first grade; when the health evaluation coefficient of the target bridge is greater than 80 and less than or equal to 95, the state evaluation grade of the target bridge is two-level; when the health evaluation coefficient of the target bridge is larger than 60 and smaller than or equal to 80, the state evaluation grade of the target bridge is three grades; when the health evaluation coefficient of the target bridge is larger than 40 and smaller than or equal to 60, the evaluation grade of the state of the target bridge is four; when the health evaluation coefficient of the target bridge is equal to or more than 0 and less than or equal to 40, the evaluation grade of the state of the target bridge is five;
the crack safety state evaluation module is used for acquiring the crack safety state of the target bridge; when the target bridge state evaluation grade is first grade, the crack safety state of the target bridge is evaluated to be a brand new state, and the using function of the bridge is not influenced; when the evaluation grade of the target bridge state is two-grade, the crack safety state of the target bridge is evaluated to be slightly defective, and the use function of the bridge is not affected; when the evaluation grade of the state of the target bridge is three, the crack safety state of the target bridge is evaluated as medium defect, and the normal use function of the bridge can be maintained; when the evaluation grade of the state of the target bridge is four, the crack safety state of the target bridge is evaluated to be a large defect, and the using function of the bridge is seriously influenced; and when the evaluation grade of the state of the target bridge is five, the crack safety state of the target bridge is evaluated to have serious defects, and the bridge cannot be normally used.
10. The BIM-based bridge crack safety assessment device according to claim 9, wherein the device further comprises a visualization module for visualizing the crack safety status of the target bridge, comprising:
the first color marking unit is used for marking the bridge as bright red when the evaluation grade of the state of the target bridge is first grade;
the second color marking unit is used for marking the bridge as dark red when the evaluation grade of the state of the target bridge is two levels;
the third color marking unit is used for marking the target bridge as brown when the evaluation level of the state of the target bridge is three levels;
the fourth color marking unit is used for marking the bridge as yellow when the evaluation level of the target bridge state is four levels;
and the fifth color marking unit is used for marking the bridge as green when the evaluation level of the target bridge state is five.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115618479A (en) * | 2022-12-20 | 2023-01-17 | 广东卓智设计工程有限公司 | BIM-based curtain wall high-sealing installation method |
| WO2024016415A1 (en) * | 2022-07-22 | 2024-01-25 | 山东大学 | Bridge multi-source, multi-scale intelligent hierarchy early warning method and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024016415A1 (en) * | 2022-07-22 | 2024-01-25 | 山东大学 | Bridge multi-source, multi-scale intelligent hierarchy early warning method and system |
| CN115618479A (en) * | 2022-12-20 | 2023-01-17 | 广东卓智设计工程有限公司 | BIM-based curtain wall high-sealing installation method |
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