CN113111464A - Steel arch bridge virtual pre-assembly method based on digital model - Google Patents
Steel arch bridge virtual pre-assembly method based on digital model Download PDFInfo
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Abstract
The invention discloses a steel arch bridge virtual pre-assembly method based on a digital model, which comprises the steps of establishing a three-dimensional part digital model of a steel bridge part and a three-dimensional steel bridge assembly digital model to obtain an assembly area of each three-dimensional part digital model; then carrying out finite element analysis on the three-dimensional steel bridge assembly digital model to carry out danger degree division on an assembly area on the three-dimensional steel bridge assembly digital model; extracting and correcting the three-dimensional part digital model in the assembly area with the risk degree higher than the safety threshold until the risk degree of the assembly area reaches the standard; finally, establishing a three-dimensional steel bridge standard digital model, comparing the up-to-standard three-dimensional steel bridge assembly digital model with the three-dimensional steel bridge standard digital model to obtain a position fitting adjustment coordinate, and adjusting the three-dimensional steel bridge assembly digital model according to the position fitting adjustment coordinate; the invention effectively ensures the accuracy and safety of bridge pre-assembly and greatly improves the efficiency of bridge pre-assembly.
Description
Technical Field
The invention belongs to the technical field of bridge virtual pre-assembly, and particularly relates to a steel arch bridge virtual pre-assembly method based on a digital model.
Background
The bridge pre-assembly is an operation process of temporarily assembling steel members such as large-span columns, beams, trusses and supports manufactured in sections and a multi-layer steel frame structure, particularly a large-scale steel structure connected by high-strength bolts, a steel shell structure manufactured in sections and supplied with goods and the like integrally or in sections before leaving a factory. However, due to the fact that the bridge members are large in size and heavy in weight, the bridge pre-assembly is very time-consuming and labor-consuming and low in efficiency, the final assembly safety and accuracy are difficult to guarantee, once the assembly accuracy is not up to standard, the bridge members need to be disassembled and then assembled again, bridge construction time is greatly prolonged, and meanwhile, the bridge members are likely to be damaged, and great economic loss is caused.
Disclosure of Invention
The invention aims to provide a digital model-based virtual pre-assembly method for a steel arch bridge, which realizes the modeling virtual pre-assembly of the bridge, greatly improves the efficiency of the pre-assembly of the bridge, and effectively ensures the safety and the accuracy of the pre-assembly of the bridge.
The invention is realized by the following technical scheme:
a steel arch bridge virtual pre-assembly method based on a digital model comprises the following steps:
step A, establishing a three-dimensional part digital model of the steel bridge part, pre-assembling the three-dimensional part digital model to form a three-dimensional steel bridge assembly digital model, and labeling the assembly area of each three-dimensional part digital model;
step B, carrying out finite element analysis on the three-dimensional steel bridge assembly digital model, and carrying out danger degree division on an assembly area on the three-dimensional steel bridge assembly digital model according to the stress distribution obtained by analysis;
step C, extracting and correcting the three-dimensional part digital models in the assembly areas with the risk degrees higher than the safety threshold value, and repeating the step A and the step B until the risk degrees of the assembly areas of all the three-dimensional part digital models reach the standard;
d, establishing a three-dimensional steel bridge standard digital model, and comparing the standard three-dimensional steel bridge assembly digital model obtained in the step C with the three-dimensional steel bridge standard digital model to obtain a position fitting adjustment coordinate;
and E, adjusting the three-dimensional steel bridge assembly digital model in the step D according to the position fitting adjustment coordinates.
In order to better implement the present invention, further, the step C specifically includes the following steps:
c1, extracting three-dimensional part digital models which are matched and spliced with each other in the splicing area with the risk degree higher than the safety threshold value, and establishing a correction reference at the matching position of the adjacent three-dimensional part digital models;
c2, correcting the length, diameter, chamfer and thickness parameters of the three-dimensional part digital model by taking the correction reference as a reference according to the stress result of the finite element analysis, and updating the three-dimensional part digital model according to the corrected parameters;
step C3, the updated three-dimensional part digital model is pre-assembled again based on the correction reference, and the step B is repeated to detect the danger degree of the assembly area;
and C4, repeating and iterating the steps C1-C3 until the risk degree of the splicing region reaches the standard.
In order to better implement the present invention, further, the correction reference established in step C1 includes correction points, correction lines, and correction surfaces.
In order to better implement the present invention, further, the step D specifically includes the following steps:
d1, establishing a standard part digital model according to the theoretical design data of the steel arch bridge, and assembling the standard part digital model to form a three-dimensional steel bridge standard digital model;
d2, establishing a standard reference in the assembly area of the adjacent standard part digital model, and establishing a standard coordinate according to the standard reference;
d3, establishing a correction coordinate in the assembly area of the adjacent three-dimensional part digital model according to the correction reference, and calculating the coordinate error between the standard coordinate and the correction coordinate;
d4, updating the corrected coordinates in real time according to the coordinate errors, repeating the step C according to the updated corrected coordinates to carry out iterative calculation of the risk degree, and repeating the step D3 to carry out iterative calculation of the coordinate errors until the coordinate errors between the corrected coordinates and the standard coordinates reach the standard and the risk degree of the three-dimensional part digital model corrected according to the corrected coordinates reaches the standard;
and D5, outputting the corrected coordinates which reach the standard, and obtaining position fitting adjustment coordinates according to the position conversion relation between the corrected coordinates which reach the standard and the standard coordinates.
In order to better implement the present invention, further, the standard reference established in step D2 includes a standard point, a standard line and a standard plane.
In order to better realize the invention, the three-dimensional part digital model established in the step A comprises a rod piece model, a column body model, a beam body model, an arch part model and a plate-shaped model, and the three-dimensional steel bridge assembly digital model is obtained by assembling according to the sequence of assembling the bridge body, assembling the arch part and assembling the support.
In order to better implement the present invention, further, in step B, a temperature compensation model is introduced into the rod model, the column model, and the beam model as follows:
ΔL＝ΔT×C×L；
wherein: delta L is the deformation of the splicing region; Δ T is the change temperature; c is a temperature expansion constant; l is the length at standard temperature.
In order to better implement the method, in the step E, a least square method is adopted to fit and assemble the three-dimensional steel bridge assembly digital model according to the position fitting and adjusting coordinates.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention adopts a mode of combining BIM modeling and finite element analysis, firstly, modeling bridge parts, then pre-assembling the three-dimensional part digital model, adopting finite element analysis software to perform stress analysis on the pre-assembled three-dimensional steel bridge assembled digital model to obtain a dangerous area in the pre-assembled model, correcting the three-dimensional part digital model in the dangerous area, simultaneously comparing the corrected three-dimensional part digital model with the three-dimensional steel bridge standard digital model to obtain a fitting adjustment coordinate, adjusting the assembling position of each three-dimensional part digital model in the three-dimensional part digital model through the fitting adjustment coordinate to ensure the position error between the three-dimensional part digital model and the three-dimensional steel bridge standard digital model, further effectively ensuring the safety and accuracy of bridge pre-assembly, and simultaneously modeling through the BIM software, the modeling parameters and the assembling parameters can be adjusted in real time to optimize the model, and the accuracy and the assembling efficiency of the bridge pre-assembling are greatly improved.
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FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
Example 1:
the steel arch bridge virtual pre-assembly method based on the digital model in the embodiment is shown in fig. 1, and comprises the following steps:
step A, building a three-dimensional part digital model of a steel bridge part based on BIM software, pre-assembling the three-dimensional part digital model to form a three-dimensional steel bridge assembly digital model, and labeling assembly areas of the three-dimensional part digital models, wherein the assembly areas comprise areas where adjacent three-dimensional part digital models are assembled and matched;
step B, carrying out finite element analysis on the three-dimensional steel bridge assembly digital model, and carrying out danger degree division on an assembly area on the three-dimensional steel bridge assembly digital model according to the stress distribution obtained by analysis; presetting a stress threshold, wherein an assembly area with stress distribution more than or equal to the stress threshold is a dangerous area, and a three-dimensional part digital model in the dangerous area is easy to dangerously deform in the actual assembly process; the assembly area with the stress distribution smaller than the stress threshold is a safe area, and the three-dimensional part digital model at the safe area is not easy to generate dangerous deformation in the actual assembly process.
Step C, extracting and correcting the three-dimensional part digital models in the assembly areas with the risk degrees higher than the safety threshold value, and repeating the step A and the step B until the risk degrees of the assembly areas of all the three-dimensional part digital models reach the standard;
the method comprises the steps of extracting all three-dimensional part digital models contained in a dangerous area, if a splicing position between two adjacent beam body models belongs to the dangerous area, extracting the beam body models contained in the current dangerous area, then correcting the beam body models, such as correcting parameters of the beam body models, such as length, thickness, width and the like, then updating the three-dimensional part digital models according to the corrected parameters, and then re-splicing and finite element analysis are carried out until the danger degree of the current splicing area reaches the standard.
D, establishing a three-dimensional steel bridge standard digital model, and comparing the standard three-dimensional steel bridge assembly digital model obtained in the step C with the three-dimensional steel bridge standard digital model to obtain a position fitting adjustment coordinate;
and establishing a three-dimensional steel bridge standard digital model according to a design theoretical value, comparing the three-dimensional part digital model in the up-to-standard three-dimensional steel bridge assembly digital model with the corresponding part model in the three-dimensional steel bridge standard digital model, further obtaining a coordinate conversion relation between the three-dimensional part digital model in the three-dimensional steel bridge assembly digital model and the corresponding part model in the three-dimensional steel bridge standard digital model, and further obtaining a position fitting adjustment coordinate.
And E, adjusting the three-dimensional steel bridge assembly digital model in the step D according to the position fitting adjustment coordinates, so that the position error between the three-dimensional steel bridge assembly digital model and the three-dimensional steel bridge standard digital model reaches the standard.
Example 2:
in this embodiment, further optimization is performed on the basis of embodiment 1, and the step C specifically includes the following steps:
c1, extracting three-dimensional part digital models which are matched and spliced with each other in the splicing area with the risk degree higher than the safety threshold value, and establishing a correction reference at the matching position of the adjacent three-dimensional part digital models;
c2, correcting the length, diameter, chamfer and thickness parameters of the three-dimensional part digital model by taking the correction reference as a reference according to the stress result of the finite element analysis, and updating the three-dimensional part digital model according to the corrected parameters; that is, parameters such as the length, diameter, chamfer, and thickness of the three-dimensional part digital model in the dangerous region are corrected by the correction reference such as increase and decrease, and the three-dimensional part digital model is updated based on the corrected parameters.
Step C3, the updated three-dimensional part digital model is pre-assembled again based on the correction reference, and the step B is repeated to detect the danger degree of the assembly area;
and C4, repeating and iterating the steps C1-C3 until the risk degree of the splicing region reaches the standard.
Further, the correction references established in step C1 include correction points, correction lines, and correction surfaces, and different correction references are selectively established according to the matching relationship between the three-dimensional part digital models, and if the adjacent three-dimensional part digital models are matched in a line-surface manner, it is preferable to establish the correction lines or the correction surfaces; if point-surface matching or point-line matching exists between the adjacent three-dimensional part digital models, preferably establishing a correction line or a correction point; if the adjacent three-dimensional part digital models are matched in a surface-to-surface mode, a correction line or a correction surface is preferably established.
Other parts of this embodiment are the same as embodiment 1, and thus are not described again.
Example 3:
in this embodiment, further optimization is performed on the basis of the foregoing embodiment 1 or 2, and the step D specifically includes the following steps:
d1, establishing a standard part digital model according to the theoretical design data of the steel arch bridge, and assembling the standard part digital model to form a three-dimensional steel bridge standard digital model;
d2, establishing a standard reference in an assembly area between the standard part digital models, and establishing a standard coordinate according to the standard reference;
d3, establishing a correction coordinate in the assembly area of the adjacent three-dimensional part digital model according to the correction reference, and calculating the coordinate error between the standard coordinate and the correction coordinate;
d4, updating the corrected coordinates in real time according to the coordinate errors, repeating the step C according to the updated corrected coordinates to carry out iterative calculation of the risk degree, and repeating the step D3 to carry out iterative calculation of the coordinate errors until the coordinate errors between the corrected coordinates and the standard coordinates reach the standard and the risk degree of the three-dimensional part digital model corrected according to the corrected coordinates reaches the standard;
and D5, outputting the corrected coordinates which reach the standard, and obtaining position fitting adjustment coordinates according to the position conversion relation between the corrected coordinates which reach the standard and the standard coordinates.
Further, the standard reference established in step D2 includes standard points, standard lines, and standard surfaces, and different standard references are selectively established according to the matching relationship between the standard part digital models, and if the adjacent standard part digital models are in line-surface matching, the standard lines or the standard surfaces are preferably established; if the adjacent standard part digital models are matched in a point-surface mode or a point-line mode, preferably establishing a standard line or a standard point; if the adjacent standard part digital models are matched in a surface-to-surface mode, a standard line or a standard surface is preferably established.
The rest of this embodiment is the same as embodiment 1 or 2, and therefore, the description thereof is omitted.
Example 4:
in this embodiment, a further optimization is performed on the basis of any one of the embodiments 1 to 3, where the three-dimensional part digital model established in step a includes a rod model, a column model, a beam model, an arch model, and a slab model, and the three-dimensional steel bridge assembly digital model is obtained by assembling the bridge body, the arch, and the support according to the sequence of assembling.
Other parts of this embodiment are the same as any of embodiments 1 to 3, and thus are not described again.
Example 5:
this embodiment is further optimized based on any one of the above embodiments 1 to 4, and in step B, the temperature compensation models are introduced into the rod model, the column model, and the beam model as follows:
ΔL＝ΔT×C×L；
wherein: delta L is the deformation of the splicing region; Δ T is the change temperature; c is a temperature expansion constant; l is the length at standard temperature.
Other parts of this embodiment are the same as any of embodiments 1 to 4, and thus are not described again.
Example 6:
in this embodiment, further optimization is performed on the basis of any one of the embodiments 1 to 5, and in the step E, a least square method is adopted to fit and assemble the three-dimensional steel bridge assembly digital model according to the position fitting adjustment coordinates.
Other parts of this embodiment are the same as any of embodiments 1 to 5, and thus are not described again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (8)
1. A steel arch bridge virtual pre-assembly method based on a digital model is characterized by comprising the following steps:
step A, establishing a three-dimensional part digital model of the steel bridge part, pre-assembling the three-dimensional part digital model to form a three-dimensional steel bridge assembly digital model, and labeling the assembly area of each three-dimensional part digital model;
step B, carrying out finite element analysis on the three-dimensional steel bridge assembly digital model, and carrying out danger degree division on an assembly area on the three-dimensional steel bridge assembly digital model according to the stress distribution obtained by analysis;
step C, extracting and correcting the three-dimensional part digital models in the assembly areas with the risk degrees higher than the safety threshold value, and repeating the step A and the step B until the risk degrees of the assembly areas of all the three-dimensional part digital models reach the standard;
d, establishing a three-dimensional steel bridge standard digital model, and comparing the standard three-dimensional steel bridge assembly digital model obtained in the step C with the three-dimensional steel bridge standard digital model to obtain a position fitting adjustment coordinate;
and E, adjusting the three-dimensional steel bridge assembly digital model in the step D according to the position fitting adjustment coordinates.
2. The virtual pre-assembly method of the steel arch bridge based on the digital model as claimed in claim 1, wherein the step C specifically includes the steps of:
c1, extracting three-dimensional part digital models which are matched and spliced with each other in the splicing area with the risk degree higher than the safety threshold value, and establishing a correction reference at the matching position of the adjacent three-dimensional part digital models;
c2, correcting the length, diameter, chamfer and thickness parameters of the three-dimensional part digital model by taking the correction reference as a reference according to the stress result of the finite element analysis, and updating the three-dimensional part digital model according to the corrected parameters;
step C3, the updated three-dimensional part digital model is pre-assembled again based on the correction reference, and the step B is repeated to detect the danger degree of the assembly area;
and C4, repeating and iterating the steps C1-C3 until the risk degree of the splicing region reaches the standard.
3. The virtual pre-assembling method for steel arch bridge based on digital model according to claim 2, wherein the correction reference established in step C1 includes correction points, correction lines and correction planes.
4. The virtual pre-assembly method of the steel arch bridge based on the digital model as claimed in claim 3, wherein the step D specifically comprises the following steps:
d1, establishing a standard part digital model according to the theoretical design data of the steel arch bridge, and assembling the standard part digital model to form a three-dimensional steel bridge standard digital model;
d2, establishing a standard reference in the assembly area of the adjacent standard part digital model, and establishing a standard coordinate according to the standard reference;
d3, establishing a correction coordinate in the assembly area of the adjacent three-dimensional part digital model according to the correction reference, and calculating the coordinate error between the standard coordinate and the correction coordinate;
d4, updating the corrected coordinates in real time according to the coordinate errors, repeating the step C according to the updated corrected coordinates to carry out iterative calculation of the risk degree, and repeating the step D3 to carry out iterative calculation of the coordinate errors until the coordinate errors between the corrected coordinates and the standard coordinates reach the standard and the risk degree of the three-dimensional part digital model corrected according to the corrected coordinates reaches the standard;
and D5, outputting the corrected coordinates which reach the standard, and obtaining position fitting adjustment coordinates according to the position conversion relation between the corrected coordinates which reach the standard and the standard coordinates.
5. The virtual pre-assembly method for the steel arch bridge based on the digital model as claimed in claim 4, wherein the standard references established in the step D2 include standard points, standard lines and standard planes.
6. The virtual pre-assembly method of the steel arch bridge based on the digital model, as claimed in any one of claims 1 to 5, wherein the three-dimensional part digital model established in step A comprises a rod model, a column model, a beam model, an arch model and a plate model, and the three-dimensional steel bridge assembly digital model is obtained by assembling the bridge body, the arch and the support in the sequence of assembling.
7. The virtual pre-assembly method of the steel arch bridge based on the digital model as claimed in claim 6, wherein in the step B, the temperature compensation models are introduced into the rod model, the column model and the beam model as follows:
ΔL＝ΔT×C×L；
wherein: delta L is the deformation of the splicing region; Δ T is the change temperature; c is a temperature expansion constant; l is the length at standard temperature.
8. The virtual pre-assembly method for the steel arch bridge based on the digital model, as claimed in any one of claims 1 to 5, wherein in the step E, the least square method is adopted to perform fitting assembly on the three-dimensional steel bridge assembly digital model according to the position fitting adjustment coordinates.
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