CN113158305B - Grasshopper-based space curved surface bridge type parameterized modeling method, system, equipment and medium - Google Patents
Grasshopper-based space curved surface bridge type parameterized modeling method, system, equipment and medium Download PDFInfo
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Abstract
The application discloses a space curved surface bridge type parameterized modeling method, a system, equipment and a medium based on a grasshopper, wherein the modeling method comprises the following steps: inputting basic parameters of the space curved bridge type, wherein the basic parameters comprise: longitudinal total length, total length of bottom curve, straight line length of bottom end point, transverse total width, projection coordinates of curved surface influence points, coordinates of the lowest point of the bottom curved surface, bridge skew angle, whether a road vertical curve exists or not, and road vertical curve patterns; and according to the basic parameters, completing the generation of a three-dimensional curved surface model through three-dimensional modeling, wherein the three-dimensional curved surface model comprises a plane area and a curved surface area. According to the method, the modeling flow can be recorded and visualized by extracting the line type of the characteristic line and the characteristic point coordinates in the three-dimensional modeling, after a designer builds a model, the self-defined independent variable can be adjusted, and the self-defined dependent variable can be directly obtained by computer-aided calculation, so that the time of repeated work is greatly reduced, and the effect on a relatively complex structure is particularly remarkable.
Description
Technical Field
The application relates to the field of special-shaped bridge scheme design, in particular to a space curved surface bridge type parameterized modeling method, a system, equipment and a medium based on a grasshopper.
Background
As an important artificial landscape for cities, landscape bridges are often pursued with attractive, novel and new construction, but abnormal bridge building designs often bring difficulties to the structural design thereof.
Modern bridge structural design is not limited to regular structures such as beams, plates and columns, various shaped special-shaped curved surface structures can be formed in urban bridges in recent years for pursuing the modeling and the attractive appearance of the structures, but the modern bridge structural design is limited to domestic industry technology and environment, and most of design houses still adopt traditional two-dimensional CAD drawing, so that the following defects exist:
the expression of complex abnormal curved surface structure is difficult; for each bridge participating party, the model has poor synergy; scheme adjustment in the bridge design stage and change in the construction stage give a great deal of repeated work to design modeling staff; the traditional drawing expression has poor precision control requirements on the construction of the structure.
Disclosure of Invention
In order to solve the technical problems, the application provides the following scheme:
a grasshopper-based space curved surface bridge type parameterized modeling method, the modeling method comprising the steps of:
inputting basic parameters of the space curved surface bridge type, wherein the basic parameters comprise: longitudinal total length, total length of bottom curve, straight line length of bottom end point, transverse total width, projection coordinates of curved surface influence points, coordinates of the lowest point of the bottom curved surface, bridge skew angle, whether a road vertical curve exists or not, and road vertical curve patterns;
according to the basic parameters, completing generation of a three-dimensional curved surface model through three-dimensional modeling, wherein the three-dimensional curved surface model comprises a plane area and a curved surface area;
and extracting the line type and the feature point coordinates of the feature line in the three-dimensional modeling.
Preferably, the three-dimensional modeling includes:
forming a plane point set;
carrying out coordinate interference according to the plane point set;
integrating the plane point sets after coordinate interference and forming a curved surface point set;
and forming a complete box body according to the curved surface point set, wherein the complete box body comprises a side plate, a top plate, a bearing platform top surface and a box girder bottom surface.
Preferably, the forming a planar point set includes:
and generating a point set on the plane area, and extracting and calculating the difference value between the coordinates of the point set and the projection coordinates of the curved surface influence points.
Preferably, the coordinate interference includes:
and respectively carrying out longitudinal height Cheng Ganshe and transverse elevation interference on the curved surface point sets, extracting a longitudinal single-row curved surface point set after the elevation interference is completed, and sequentially copying the curved surface point sets for integration.
Preferably, the forming a complete case includes:
and extracting characteristic lines according to the curved surface point set which is integrated, forming the side plates and the top plate according to the characteristic lines, forming the top surface of the bearing platform according to the elevation, the size and the skew angle of the top surface of the bearing platform, and cutting off the redundant parts of the curved surface point set to form the bottom surface of the box girder.
Preferably, the extracting the line type of the characteristic line includes:
and extracting a longitudinal section and an oblique transverse section of the curved surface area, projecting the longitudinal section and the oblique transverse section to the plane area, and arranging the longitudinal section and the oblique transverse section into a two-dimensional curve.
Preferably, the extracting coordinates of the feature points includes:
inputting horizontal projection precision of coordinates to be derived, setting a cut curved surface according to the projection precision, acquiring a longitudinal line of the cut curved surface, acquiring coordinates of the feature points according to the longitudinal line, and extracting.
A grasshopper-based space surface bridge type parametric modeling system, the system comprising:
the transmission module comprises a grasshopper graphical programming language and a grasshopper battery and is used for transmitting parameters and connecting the modeling module and the grasshopper;
the modeling module is used for carrying out three-dimensional modeling according to the basic parameters of the bridge type;
and the extraction module is used for extracting the line type of the feature line and the feature point coordinates in the completed three-dimensional modeling.
A computer device comprising a memory and a processor, the memory having stored thereon a computer program, which when executed by the processor implements a grasshopper-based space surface bridge type parametric modeling method as described hereinabove.
A storage medium storing a computer program comprising program instructions which, when executed by a processor, implement a grasshopper-based space surface bridge type parametric modeling method as defined in any one of the preceding claims.
According to the space curved surface bridge type parameterized modeling method, system, equipment and medium based on the grasshopper, a modeling flow can be recorded and visualized operation can be performed based on the bridge model established by the grasshopper, after a designer builds the model, the customized independent variables (such as bridge span, bridge width, beam height and plate thickness) can be adjusted, the customized dependent variables (such as three-dimensional model, bridge characteristic lines, control point coordinates and material quantity statistics) can be obtained directly through computer-aided calculation, and the designer can adjust the independent variables to obtain the dependent variables, so that the time of repeated work is greatly reduced, and the effect on a relatively complex structure is particularly remarkable.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a modeling method in the present embodiment;
FIG. 2 is a diagram showing the connection of plug-ins for integrating plane point sets and forming curved point sets after coordinate interference in the present embodiment;
FIG. 3 is a schematic diagram of generating a complete box model according to a set of curved surface points in the present embodiment;
FIG. 4 is a schematic diagram of generating a point-integrated surface model from a planar point set in the present embodiment;
FIG. 5 is a diagram of a plug-in connection forming a planar point set in this embodiment;
FIG. 6 is a view showing the connection of inserts forming the curved profile of the bottom surface of the box girder in this embodiment;
FIG. 7 is a graph showing the connection of inserts for the web and diaphragm characteristic curves obtained by sectioning the box girder according to the longitudinal web and transverse diaphragm positions in this embodiment;
FIG. 8 is a schematic view showing the projection of the web and separator characteristic curves onto the planar area and the arrangement of the web and separator characteristic curves into two-dimensional curves in the present embodiment;
FIG. 9 is a schematic view of the longitudinal web height profile for all transverse baffle positions in this embodiment;
FIG. 10 is a view showing the connection of inserts to the cross-sectional spacer position control height based on longitudinal web and transverse spacer position in this embodiment;
fig. 11 is a longitudinal view of the bridge type provided in the present embodiment;
FIG. 12 is a transverse cross-sectional view of A-A of FIG. 11;
FIG. 13 is a top view of B-B of FIG. 11;
FIG. 14 is a contour view of C-C of FIG. 11;
fig. 15 is a schematic diagram of plug-in connection of a transmission module in the modeling system according to the present embodiment;
FIGS. 16-a and 16-b are schematic diagrams of plug-in connections of modeling modules in the modeling system provided by the present embodiment;
fig. 17 is a schematic diagram of plug-in connection of the extraction module in the modeling system according to the present embodiment.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
As shown in fig. 1, the embodiment of the application provides a space curved surface bridge type parameterized modeling method based on a grasshopper, which can include the following steps:
inputting basic parameters of the space surface bridge type (i.e. inputting basic parameters of the space surface bridge type in the grasshopper) includes: longitudinal total length, total length of bottom curve, straight line length of bottom end point, transverse total width, projection coordinates of curved surface influence points, coordinates of the lowest point of the bottom curved surface, bridge skew angle, whether a road vertical curve exists or not, and road vertical curve patterns; according to basic parameters, completing generation of a three-dimensional curved surface model through three-dimensional modeling, wherein the three-dimensional curved surface model comprises a plane area and a curved surface area; and extracting the line type and the feature point coordinates of the feature line in the three-dimensional curved surface model.
Specifically, performing three-dimensional modeling includes: forming a plane point set; coordinate interference is carried out according to the plane point set; as shown in fig. 2, integrating the plane point sets after coordinate interference and forming a curved surface point set; and forming a complete box body (shown in figure 3) comprising the side plates, the top plate, the top surface of the bearing platform and the bottom surface of the box girder according to the curved surface point set.
As shown in fig. 4-5, forming a set of planar points includes: and generating a point set on the plane area, and extracting and calculating the difference value between the coordinates of the point set and the projection coordinates of the curved surface influence points.
Specifically, the coordinate interferometry includes: and respectively carrying out longitudinal height Cheng Ganshe and transverse elevation interference on the curved surface point sets, extracting a longitudinal single-row curved surface point set after the elevation interference is completed, and sequentially copying the curved surface point sets for integration.
Specifically, forming the complete case includes: and extracting characteristic lines according to the curved surface point set which is integrated, forming a side plate and a top plate according to the extracted characteristic lines, forming a top surface of a bearing platform according to elevation, size and skew angle of the top surface of the bearing platform, and cutting off redundant parts of the curved surface point set to form the bottom surface of the box girder as shown in fig. 6.
As shown in fig. 7, extracting the line type of the feature line includes: extracting a longitudinal section and an oblique transverse section of the curved surface area, projecting the longitudinal section and the oblique transverse section to the plane area, and arranging the longitudinal section and the oblique transverse section into a two-dimensional curve (as shown in fig. 8); specifically, a box girder is cut according to the position of a longitudinal web plate and a transverse baffle plate to obtain a web plate and baffle plate characteristic curve.
As shown in fig. 9-10, the extracting coordinates of the feature points includes: inputting horizontal projection precision of coordinates to be derived, setting a cut curved surface according to the projection precision, acquiring a longitudinal line of the cut curved surface, acquiring coordinates of feature points according to the longitudinal line, and extracting.
As shown in fig. 11 to 14, the bridge type is a 60+30m steel box girder bridge, the bottom plate of the steel box girder is a special-shaped smooth curved surface, the middle of the curved surface is concave, four side lines are straight lines, the bridge box girder is provided with a longitudinal web plate and a transverse partition plate, and for the complex structure of the bridge, the cooperation and control precision of each side are required in the design, construction blanking and field splicing welding processes, the structural modeling precision is required to be high, and the data synchronism is good; in the early scheme design of the bridge, the related multi-round opinions of all parties and the adjustment of bridge channels and clearance to the structural model also provide high requirements on the efficiency of the structural model; compared with the civil engineering structure, the bridge structure has large span, the influence of the road vertical section (the general road vertical section is a two-dimensional vertical curve, and the same is true in this example) on the structure needs to be considered, and according to the modeling method in the embodiment, various basic parameters can be automatically adjusted according to the vertical section of each part of the road as shown in fig. 12-14.
According to the embodiment of the application, parameters such as the longitudinal total length L of a bridge, the total length L2 of a bottom curve, the linear length L3 of a bottom end point, modeling division precision (such as division horizontal projection precision is 1m and 0.1 m), the width B of a transverse bridge, the coordinate P point coordinate of the projection coordinate of the middle point of a curved surface influence point Z1 axis, the height difference H1 of the lowest point Z coordinate of a bottom surface curved surface, the skew angle A, whether a road vertical curve (yes/no), a vertical curve pattern (two-dimensional multi-section line import) and the like are considered or not can be adjusted, a three-dimensional curved surface model is obtained immediately, a bottom web longitudinal control line and a transverse baffle control line are listed, and the lattice three-dimensional coordinate of the curved surface under the design person precision requirement is derived.
The specific operation steps are as follows:
(1) The following parameters are input through the transmission module, which is shown in fig. 15:
total longitudinal length l=90 m; bottom curve total length l2=63 m;
bottom end point straight line length l3=2m;
modeling division accuracy = 1m;
transverse bridge width b=24m;
the coordinate P point coordinate (60,0,0) is projected at the middle point of the Z1 axis of the curved surface influence point;
the Z coordinate height difference of the lowest point of the bottom surface curved surface is H1= 5.308;
skew angle a=14°;
whether the road vertical curve is considered (yes);
vertical curve style (two-dimensional multi-segment line lead-in);
edge web height = 2m;
bridge grade = 0.02;
bearing platform top elevation= -3.173;
longitudinal web Y coordinates:
-11.55/-11.12/-10.69/-10.26/-9.83/-9.4/-8.97/-8.13/-7.7/-7.27/-6.84/-6.41/-5.98/-5.55/-4.71/-4.28/-3.85/-3.42/-2.99/-2.56/-2.13/-1.29/-0.86/-0.43/0/0.43/0.86/1.29/2.13/2.56/2.99/3.42/3.85/4.28/4.71/5.55/5.98/6.41/6.84/7.27/7.7/8.13/8.97/9.4/9.83/10.26/10.69/11.12/11.55；
x coordinates of each transverse partition board:
0.09/0.6/1.59/3.2/5.2/8.2/11.2/14.2/17.2/20.2/23.2/26.2/29.2/32.2/35.2/38.2/41.2/44.2/47.2/50.2/53.2/55.6/57.6/59/60/61/62.4/64.4/66.8/69.8/72.8/75.8/78.8/81.8/84.8/86.8/88.41/89.4/89.91/；
coordinate derived form control accuracy = 0.5.
(2) The three-dimensional curved surface model is obtained by operating a modeling module, which is shown in fig. 16-a and 16-b.
(3) The linear type of the feature line and the feature point coordinates in the completed three-dimensional curved surface model are extracted through an extraction module, and then the feature point coordinates are derived in the EXCEL format, wherein the extraction module is shown in fig. 17.
The embodiment of the application discloses a space curved surface bridge type parameterized modeling method, a space curved surface bridge type parameterized modeling system and a space curved surface bridge type parameterized modeling device based on a grasshopper, which can record a modeling flow and perform visualized operation, after a designer builds a model, the designer can adjust a custom independent variable, and the designer can directly calculate the custom independent variable by computer assistance, so that the designer can automatically adjust the custom independent variable according to needs, the time of repeated work is greatly reduced, and the effect is particularly remarkable for a relatively complex structure.
From the above description of embodiments, it will be apparent to those skilled in the art that the present application may be implemented in software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the embodiments or some parts of the embodiments of the present application.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for a system or system embodiment, since it is substantially similar to a method embodiment, the description is relatively simple, with reference to the description of the method embodiment being made in part. The systems and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present application without undue burden.
The above describes in detail a method, a system, a device and a medium for modeling a space curved surface bridge type parameterization based on a grasshopper, and specific examples are applied to illustrate the principle and the implementation of the application, and the above description of the examples is only used for helping to understand the method and the core idea of the application; also, it is within the scope of the present application to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the application.
Claims (7)
1. The space curved surface bridge type parameterized modeling method based on the grasshopper is characterized by comprising the following steps of:
inputting basic parameters of the space curved surface bridge type, wherein the basic parameters comprise: longitudinal total length, total length of bottom curve, straight line length of bottom end point, transverse total width, projection coordinates of curved surface influence points, coordinates of the lowest point of the bottom curved surface, bridge skew angle, whether a road vertical curve exists or not, and road vertical curve patterns;
according to the basic parameters, completing generation of a three-dimensional curved surface model through three-dimensional modeling, wherein the three-dimensional curved surface model comprises a plane area and a curved surface area;
extracting the line type and the feature point coordinates of the feature line in the three-dimensional modeling;
wherein, the three-dimensional curved surface model completion through three-dimensional modeling includes:
forming a plane point set;
carrying out coordinate interference according to the plane point set; the coordinate interference comprises the steps of respectively carrying out longitudinal height Cheng Ganshe and transverse elevation interference on the plane point set, extracting a longitudinal single-row curved point set after the elevation interference is completed, and sequentially copying the curved point sets for integration;
integrating the plane point sets after coordinate interference and forming a curved surface point set;
and forming a complete box body according to the curved surface point set, wherein the complete box body comprises a side plate, a top plate, a bearing platform top surface and a box girder bottom surface.
2. The method of space surface bridge type parametric modeling according to claim 1, wherein the forming a set of planar points comprises:
and generating a point set on the plane area, and extracting and calculating the difference value between the coordinates of the point set and the projection coordinates of the curved surface influence points.
3. The method of space surface bridge type parametric modeling according to claim 1, wherein the forming the complete box comprises:
and extracting characteristic lines according to the curved surface point set which is integrated, forming the side plates and the top plate according to the characteristic lines, forming the top surface of the bearing platform according to the elevation, the size and the skew angle of the top surface of the bearing platform, and cutting off the redundant parts of the curved surface point set to form the bottom surface of the box girder.
4. The method for modeling space surface bridge type parameterization according to claim 1, wherein the extracting the line type of the characteristic line comprises:
and extracting a longitudinal section and an oblique transverse section of the curved surface area, projecting the longitudinal section and the oblique transverse section to the plane area, and arranging the longitudinal section and the oblique transverse section into a two-dimensional curve.
5. The method for parameterized modeling of a space surface bridge according to claim 1, wherein the extracting coordinates of the feature points comprises:
inputting horizontal projection precision of coordinates to be derived, setting a cut curved surface according to the projection precision, acquiring a longitudinal line of the cut curved surface, acquiring coordinates of the feature points according to the longitudinal line, and extracting.
6. A computer device, characterized in that the computer device comprises a memory and a processor, wherein the memory stores a computer program, and the processor implements a grasshopper-based space surface bridge type parametric modeling method according to any one of claims 1-5 when the processor executes the computer program.
7. A storage medium storing a computer program comprising program instructions which, when executed by a processor, implement a grasshop-based space surface bridge parameterized modeling method according to any of claims 1-5.
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| CN113158305A (en) | 2021-07-23 |
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