CN110706348B - Parameterized modeling method for assembled steel structure building - Google Patents
Parameterized modeling method for assembled steel structure building Download PDFInfo
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- CN110706348B CN110706348B CN201910984199.9A CN201910984199A CN110706348B CN 110706348 B CN110706348 B CN 110706348B CN 201910984199 A CN201910984199 A CN 201910984199A CN 110706348 B CN110706348 B CN 110706348B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 64
- 239000010959 steel Substances 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000010079 rubber tapping Methods 0.000 claims abstract description 5
- 210000003491 skin Anatomy 0.000 claims description 31
- 238000010276 construction Methods 0.000 claims description 12
- 238000004458 analytical method Methods 0.000 claims description 8
- 230000011218 segmentation Effects 0.000 claims description 8
- 210000002615 epidermis Anatomy 0.000 claims description 5
- 238000013461 design Methods 0.000 description 15
- 238000010586 diagram Methods 0.000 description 8
- 241000254032 Acrididae Species 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 4
- 241001139947 Mida Species 0.000 description 3
- 241000282806 Rhinoceros Species 0.000 description 3
- 238000009430 construction management Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
- G06T17/10—Constructive solid geometry [CSG] using solid primitives, e.g. cylinders, cubes
Abstract
The invention discloses a parameterized modeling method for an assembled steel structure building, which comprises the following steps: an inner skin curved surface and an outer skin curved surface of the lofting tapping structure; cutting the inner surface curved surface and the outer surface curved surface along the vertical stress column of the steel structure, forming an inner chord member and an outer chord member of the vertical stress column at the intersection, and connecting web members between the inner chord member and the outer chord member; the inner surface curved surface and the outer surface Pi Qumian are connected along the horizontal stress Liang Fenge of the steel structure, the dividing intersection points are connected to form an upper chord member and a lower chord member of the horizontal stress beam, and a web member is connected between the upper chord member and the lower chord member; and giving cross section information to the inner chord, the outer chord, the upper chord, the lower chord and the web members to complete parametric modeling of the steel structure model. Compared with the traditional modeling mode, the parametric modeling method has excellent adjustability and good adaptability to complex body building.
Description
Technical Field
The invention relates to the technical field of BIM steel structure design, in particular to a parametric modeling method for an assembled steel structure building.
Background
When the traditional steel structure is processed, a steel structure model is turned into by using Tekla software according to a CAD two-dimensional drawing, and then the component production is carried out according to the model, at the moment, the method is labor-consuming and time-consuming, and repeated checking is needed. After parametric modeling is adopted, the model can be directly transferred to Tekla software, and because the model is operated by a computer, the Tekla secondary modeling time is negligible, errors can not occur, and the workload of steel structure deepening designers is greatly reduced.
Disclosure of Invention
The invention mainly aims at the defects of the prior art, and provides a parameterized modeling method for an assembled steel structure building, which has excellent adjustability and good adaptability to complex-shaped buildings.
The technical scheme adopted by the invention is as follows: a parameterized modeling method for an assembled steel structure building comprises the following steps:
an inner skin curved surface and an outer skin curved surface of the lofting tapping structure;
cutting the inner surface curved surface and the outer surface curved surface along the vertical stress column of the steel structure, forming an inner chord member and an outer chord member of the vertical stress column at the intersection, and connecting web members between the inner chord member and the outer chord member;
the inner surface curved surface and the outer surface Pi Qumian are connected along the horizontal stress Liang Fenge of the steel structure, the dividing intersection points are connected to form an upper chord member and a lower chord member of the horizontal stress beam, and a web member is connected between the upper chord member and the lower chord member;
and giving cross section information to the inner chord, the outer chord, the upper chord, the lower chord and the web members to complete parametric modeling of the steel structure model.
In some embodiments of the parametric modeling method of the present invention, grasshopper software is used to loft the inner skin surface and the outer skin surface, and to construct a steel structural model of the vertical stress column and the horizontal stress beam.
In some embodiments of the parametric modeling method of the present invention, after completing the parametric modeling of the steel structure model, the method further comprises the steps of:
importing the steel structure model from the Grasshopper software into Midas software for structural stress analysis;
and after the stress analysis meets the requirements, importing the steel structure model from the Midas software into 3D3S software, and performing drawing.
In some embodiments of the parametric modeling method of the present invention, the method further comprises the steps of: and importing the steel structure model into a Tekla model in the 3D3S software, and carrying out steel structure deepening drawing.
In some embodiments of the parametric modeling method of the present invention, the steel structure is a petal tree structure, the vertical stress column is an arc column, and the horizontal stress beam is a ring beam.
In some embodiments of the parametric modeling method of the present invention, the petal tree structure further comprises a branch portion, the parametric modeling method further comprising the steps of:
the upper ends of the upper chord member and the lower chord member of the vertical stress column are radially outwards extended to form chord members of radial branches;
connecting chords supporting the branches between the chords of adjacent radial branches;
connecting the end points of the chords of the radial branches to form chords which surround the branches;
and endowing the chord members of the radial branches, the chord members for supporting the branches and the chord members for surrounding the branches with section information, and completing parameterization modeling of the steel structure model.
In some embodiments of the parametric modeling method of the present invention, web members are connected between chords of each radial branch, web members are connected between chords of each support branch, and web members are connected between chords of each surrounding enclosure branch.
In some embodiments of the parametric modeling method of the present invention, the trunk of the petal tree structure is bell-mouthed, the bottom is circular, and the top is elliptical, and in the step of lofting the inner skin curved surface and the outer skin curved surface, the method includes:
dividing the trunk into a plurality of sections in the height direction, wherein the shape of the sections changes from round to elliptical from bottom to top;
and lofting the sections into a space curved surface by utilizing a plurality of sections to obtain an inner surface curved surface and an outer surface curved surface of the trunk.
In some embodiments of the parametric modeling method of the present invention, the step of cutting the inner skin surface and the outer surface comprises:
forming an array by taking the vertical stress center of the steel structure as an axis through the surface units, wherein the radian is equal to or less than the minimum distance between the vertical stress columns, so as to form a plurality of surface units;
and selecting corresponding surface units according to the axial positions of the vertical stress columns, and cutting to obtain the inner chords and the outer chords of the vertical stress columns at the intersections.
In some embodiments of the parametric modeling method of the present invention, the step of segmenting the inner skin surface and the outer skin surface comprises:
selecting a plurality of sections to respectively perform equal radian segmentation, wherein segmentation intersection points are connected to form an upper chord member and a lower chord member of the ring beam;
and connecting the dividing intersection points on the upper chord member and the dividing intersection points on the lower chord member through array arrangement to form web members.
By adopting the technical scheme, the invention has the following technical effects: compared with the traditional modeling mode, the parametric modeling has excellent adjustability and good adaptability to complex body construction, the structural model is built by adopting Grasshoper (GH) software developed based on a Rhinoceros platform, the Grasshoper is a visual node programming tool, the modeling design is carried out in a program script mode, compared with the traditional programming language programming or manual CAD modeling, the time is greatly saved, only corresponding parameters are needed to be modified by modifying the model, and a large amount of repeated labor is saved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a main flow chart of a parametric modeling method for an assembled steel structure building according to an embodiment of the present invention.
Fig. 2 is a model view of the inner and outer epidermis of the trunk in the embodiment of the present invention.
Fig. 3 is a diagram of a cutting model of the inner and outer epidermis of the trunk in an embodiment of the present invention.
Fig. 4 is a diagram of a trunk arc limb model in an embodiment of the invention.
Fig. 5 is a model view of a trunk ring beam in an embodiment of the invention.
Fig. 6 is a model diagram of the final shaping of the trunk in the embodiment of the invention.
Fig. 7 is a diagram of a petal tree model in an embodiment of the present invention.
Fig. 8 is a diagram of a petal tree model (with cross-sectional information) in an embodiment of the invention.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.
The parametric design and BIM technology are rapidly developed in recent years as an emerging technical means, and as a link in the parametric design, parametric modeling has excellent adjustability and good adaptability to complex-shaped buildings compared with a traditional modeling mode. The structural model is built by adopting Grasshoper (GH) software secondarily developed based on the Rhinoceros platform, the Grasshoper is a visual node programming tool, and the modeling design is carried out in a program script mode, so that compared with the traditional programming language programming or manual CAD modeling, the time is greatly saved, and only corresponding parameters are needed to be modified to modify the model, so that a great amount of repeated labor is saved.
When the traditional steel structure is processed, a steel structure model is turned into by using Tekla software according to a CAD two-dimensional drawing, and then the component production is carried out according to the model, at the moment, the method is labor-consuming and time-consuming, and repeated checking is needed. After parametric modeling is adopted, the model can be directly transferred to Tekla software, and because the model is operated by a computer, the Tekla secondary modeling time is negligible, errors can not occur, and the workload of steel structure deepening designers is greatly reduced.
The invention will now be described in further detail with reference to the drawings and to specific examples.
Referring first to fig. 1, an embodiment of the present invention provides a parametric modeling method for an assembled steel structure building, which mainly includes the following steps:
step S1: an inner skin curved surface and an outer skin curved surface of the lofting tapping structure;
step S2: cutting an inner surface curved surface and an outer surface curved surface along a vertical stress column of the steel structure, forming an inner chord member and an outer chord member of the vertical stress column at the intersection, and connecting web members between the inner chord member and the outer chord member;
step S3: the upper chord member and the lower chord member of the horizontal stress beam are formed by connecting the segmentation intersection points along the inner skin curved surface and the outer skin curved surface of the horizontal stress Liang Fenge of the steel structure, and the web member is connected between the upper chord member and the lower chord member;
step S4: and giving cross section information to the inner chord, the outer chord, the upper chord, the lower chord and the web members, and completing parametric modeling of the steel structure model.
The steel structure models built in the steps S1-S4 are built by Grasshopper (GH) software based on the secondary development of a Rhinoceros platform. Grasshopper is a visual node programming tool, and modeling design is carried out in a program script mode, so that compared with the traditional programming language programming or manual CAD modeling, the time is greatly saved, and only corresponding parameters are needed to be modified for modifying the model, so that a great deal of repeated labor is saved.
And, after completing the parametric modeling of the steel structure model of steps S1-S4, the method may further include the steps of:
in the design stage: importing a steel structure model from Grasshopper software into Midas software to perform structural stress analysis; after the stress analysis meets the requirements, importing the steel structure model from Midas software into 3D3S software for drawing; and
in the production stage: and importing the steel structure model into a Tekla model in the 3D3S software, and carrying out steel structure deepening drawing.
In the construction stage: and the whole construction process is simulated through a Tekla model and related BIM software, and the construction flow is optimized, so that the construction management and control are convenient.
The invention adopts a space parameterization modeling method based on Grasshopper software, and solves the design problem of a space steel structure. The following is a description of the parameterized design steps one by one, taking the petal tree steel structure as an example.
As shown in fig. 7 and 8, three-dimensional modeling diagrams of the spatial steel structure of the petal tree of the present embodiment are shown, and the spatial steel structure system of the petal tree is divided into two parts, a vertical stress system (fig. 4) and a horizontal stress system (fig. 5). The vertical stress system consists of 10 vertical stress columns, namely arc-shaped columns 11, and bears the self weight of the structure; the horizontal stress system consists of 9 annular stress beams, namely annular beams 12, and plays a role in horizontally restraining the arc-shaped columns 11.
Because the whole structure system is irregular, the conventional CAD design is difficult to complete, the parametric design is simple and easy to implement, and the petal column is divided into a trunk and branches during the design. The following steps are as follows:
step 1: trunk modeling
1. Establishing the inner and outer epidermis of the trunk
As shown in fig. 2, the shape of the inner and outer skin of the trunk is shown, the bottom is circular, the top is elliptical, and the whole is bell-mouthed. Based on Grasshopper software, the method is realized by a program: firstly, an inner skin 101 is established, geometrical parameters of a model are determined by utilizing a geometrical relationship, a trunk is divided into 9 sections along the height direction, the sections are changed into ovals from bottom to top, a space curved surface is lofted by a loft command, and then an outer skin 102 is constructed in the same way.
2. Cutting the inner and outer skins of the trunk to form a trunk chord
As shown in fig. 3, through the surface units, an array is formed along the radian of the Z axis (the vertical stress central axis of the steel structure) and the like, 16 surfaces (the radian is preferably the minimum distance between the arc columns) are formed, 10 surfaces are selected as cutting surfaces 104 (the surface where the central axis of the arc column of the steel structure is preferably located), the inner and outer surfaces of the trunk are cut, and the inner chord 111 and the outer chord 112 of the 10 trunk chords are formed at the intersection, as shown in fig. 4. Parameters were established based on Grasshopper software.
3. Each arc limb of the trunk is built
As shown in fig. 4, the inner chords 111 and the outer chords 112 of the inner and outer skins of the trunk are connected through the web members 113 by means of space point finding, array sorting and the like to form 10 arc-shaped columns 11. The inner chord 111, the outer chord 112 and the web member 113 form a structural line structure of the arc column 11 (the structural line structure is a central axis of each rod member section of the arc column, and after being given section information of the section, the structural line structure can be constructed to form a complete model of the arc column). The specific method comprises the following steps: a. dividing the inner and outer skins of the trunk into 25 circles of nodes vertically (200 parts along the circumference) through a face segmentation command; b. taking the node as a circle center, establishing a circle to intersect with inner and outer chords of 10 trunks, and taking the intersection point; c. the intersections on the inner and outer chords are arranged in arrays and are connected to form web members 113. Parameters were established based on Grasshopper software.
4. Building trunk ring beam
As shown in fig. 5, the upper chord 121 and the lower chord 122 of the ring beam 12 are established by means of classification search, array sorting, etc., and the chords are connected by the beam web 123 to form 8 ring beams. The method comprises the following steps: a. selecting 9 circles/ellipses of the inner skin and the outer skin of the trunk established in the step 1, respectively performing equal radian segmentation, and connecting segmentation intersection points to form upper and lower chords of the ring beam; b. the upper chord and lower chord dividing intersection points are connected through array arrangement to form a beam web member. Parameters were established based on Grasshopper software.
The trunk final model effect is shown in fig. 6.
Step 2: branch modeling
The branch model is as shown in fig. 7, the branches are classified into three types, one type is radial branches 131, and the radial branches and 10 arc-shaped columns 11 form a whole; one type is a support branch 132 between radial branches; one type is four-sided containment branch 133. Parameters were established based on Grasshopper software. The method comprises the following steps: a. the upper ends of chords of the arc-shaped columns are radially outwards extended to form chords of radial branches; b. connecting chords for supporting the branches between chords of adjacent radial branches; c. connecting the end points of the chords of the radial branches to form chords which surround the branches; d. the section information is endowed to the chords of the radial branches, the chords supporting the branches and the chords surrounding the branches, so that the parameterization modeling of the steel structure model is completed. The method comprises the steps of connecting web members among chords of each radial branch, connecting web members among chords of each supporting branch, connecting web members among chords of each surrounding enclosing branch, and carrying out parameterization modeling on a steel structure model by endowing section bar section information.
Step 3: final model completion
The petal tree model is shown in fig. 7, the section information of each rod section is given to the rear model, and the model is shown in fig. 8, so that all parameterized modeling work is completed.
The following work:
after the model is built, the subsequent work is a structural design stage, a component production stage and a construction stage.
1. Design phase
And importing the grasshopper parameterized modeling result into structural design software Midas to perform structural stress analysis. After the stress analysis meets the requirements, importing the Midas model into 3D3S of structural software, and performing drawing and plotting through the 3D 3S.
2. Production phase
The 3D3S model is led into the Tekla model, the deepening drawing of the steel tapping structure can be facilitated, and model parameters are input into equipment for the arc-shaped rod piece, so that the arc-shaped component is directly produced.
3. Construction stage
And the whole construction process is simulated through a Tekla model and related BIM software, and the construction flow is optimized, so that the construction management and control are convenient.
By adopting the technical scheme, the invention has the following main beneficial effects:
1. through the application of the parameterization tool, the full-process digitization and informatization of the project can be realized, the workload is reduced, the accuracy is high, and the real BIM application is realized.
2. Compared with the traditional modeling mode, the parametric modeling has excellent adjustability and good adaptability to complex body building. Grasshopper is a visual node programming tool, and modeling design is carried out in a program script mode, so that compared with the traditional programming language programming or manual CAD modeling, the time is greatly saved, and only corresponding parameters are needed to be modified for modifying the model, so that a great deal of repeated labor is saved.
3. By converting Grasshopper model to Midas to 3D3S, the structure construction diagram can be automatically drawn in batches without drawing extra time.
4. Through the conversion from Grasshopper model to Midas to 3D3S to Tekla, the structure processing detailed diagram can be automatically output in batches, 100% of accuracy can be ensured, and parameters can be input into factory equipment for production.
5. And the whole construction process is simulated through a Tekla model and related BIM software, and the construction flow is optimized, so that the construction management and control are convenient.
6. Through programming languages, a space model is built by adopting programming languages such as space point finding, classified retrieval, array ordering and the like.
It should be noted that, the structures, proportions, sizes and the like shown in the drawings attached to the present specification are used for understanding and reading only in conjunction with the disclosure of the present specification, and are not intended to limit the applicable limitations of the present invention, so that any modification of the structures, variation of proportions or adjustment of sizes of the structures, proportions and the like should not be construed as essential to the present invention, and should still fall within the scope of the disclosure of the present invention without affecting the efficacy and achievement of the present invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.
The present invention is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical matters of the present invention can be made by those skilled in the art without departing from the scope of the present invention.
Claims (4)
1. The parameterized modeling method for the assembled steel structure building is characterized by comprising the following steps of:
an inner skin curved surface and an outer skin curved surface of the lofting tapping structure;
cutting the inner skin curved surface and the outer skin curved surface along a vertical stress column of the steel structure, forming an inner chord member and an outer chord member of the vertical stress column at the intersection, and connecting web members between the inner chord member and the outer chord member; wherein the step of cutting the inner skin curved surface and the outer skin curved surface comprises: forming an array by taking the vertical stress center of the steel structure as an axis through the surface units, wherein the radian is equal to or less than the minimum distance between the vertical stress columns, so as to form a plurality of surface units; selecting corresponding surface units according to the axial positions of the vertical stress columns, and cutting to obtain an inner chord member and an outer chord member of the vertical stress columns at the intersection positions;
the inner surface curved surface and the outer surface Pi Qumian are connected along the horizontal stress Liang Fenge of the steel structure, the dividing intersection points are connected to form an upper chord member and a lower chord member of the horizontal stress beam, and a web member is connected between the upper chord member and the lower chord member;
section information is given to the inner chord, the outer chord, the upper chord, the lower chord and the web members, and parametric modeling of the steel structure model is completed;
the steel structure is a petal tree structure, the vertical stress column is an arc column, and the horizontal stress beam is an annular beam; the petal tree structure further comprises a branch part, and the parameterized modeling method further comprises the steps of: the upper ends of the upper chord member and the lower chord member of the vertical stress column are radially outwards extended to form chord members of radial branches; connecting chords supporting the branches between the chords of adjacent radial branches; connecting the end points of the chords of the radial branches to form chords which surround the branches; the chord members of the radial branches, the chord members for supporting the branches and the chord members for surrounding the branches are endowed with section information, so that parameterized modeling of the steel structure model is completed;
the web members are connected between the chords of each radial branch, the web members are connected between the chords of each supporting branch, and the web members are connected between the chords of each surrounding enclosing branch; the trunk of petal tree structure is the horn mouth shape, and the bottom is circular, and the top is oval, in the lofting the step of inner epidermis curved surface with the outer epidermis curved surface, include: dividing the trunk into a plurality of sections in the height direction, wherein the shape of the sections changes from round to elliptical from bottom to top; setting out a plurality of sections to form a space curved surface to obtain an inner surface curved surface and an outer surface curved surface of the trunk;
a step of dividing the inner skin curved surface and the outer skin curved surface, comprising: selecting a plurality of sections to respectively perform equal radian segmentation, wherein segmentation intersection points are connected to form an upper chord member and a lower chord member of the ring beam; connecting the dividing intersection points on the upper chord member and the dividing intersection points on the lower chord member through array arrangement to form web members; determining geometric parameters of the model by utilizing the geometric relationship; the inner chord member, the outer chord member and the web members form a construction line structure of the arc-shaped column.
2. The parametric modeling method for the fabricated steel structure building according to claim 1, wherein: and lofting the inner skin curved surface and the outer skin curved surface by adopting Grasshopper software, and constructing a steel structure model of the vertical stress column and the horizontal stress beam.
3. The parametric modeling method of fabricated steel structure building according to claim 2, further comprising the steps of, after completion of parametric modeling of the steel structure model:
importing the steel structure model from the Grasshopper software into Midas software for structural stress analysis;
and after the stress analysis meets the requirements, importing the steel structure model from the Midas software into 3D3S software, and performing drawing.
4. A parametric modeling method for fabricated steel structure buildings as claimed in claim 3, further comprising the steps of: and importing the steel structure model into a Tekla model in the 3D3S software, and carrying out steel structure deepening drawing.
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| CN111414662B (en) * | 2020-03-31 | 2023-05-26 | 北京市建筑设计研究院有限公司 | Method for assembling strip-shaped curved surface building skin by using linear profile |
| CN112329090A (en) * | 2020-10-10 | 2021-02-05 | 河南建祥装饰工程有限公司 | Steel truss parametric modeling and calculating method based on BIM |
| CN112528377A (en) * | 2020-12-15 | 2021-03-19 | 上海市建工设计研究总院有限公司 | Modeling method for structural type axis of outer package support steel structure |
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| CN113919034B (en) * | 2021-10-20 | 2024-03-12 | 中国建筑第八工程局有限公司 | GH parametric modeling method and system for variable-section hyperbolic beam |
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