CN110706348A - Parameterized modeling method for assembled steel structure building - Google Patents
Parameterized modeling method for assembled steel structure building Download PDFInfo
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Abstract
The invention discloses a parametric modeling method of an assembly type steel structure building, which comprises the following steps: setting out an inner skin curved surface and an outer skin curved surface of the steel 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 and an outer chord of the vertical stress column at the intersection, and connecting a web member between the inner chord and the outer chord; dividing the inner skin curved surface and the outer skin curved surface along the horizontal stress beam of the steel structure, connecting the dividing intersection points to form an upper chord and a lower chord of the horizontal stress beam, and connecting a web member between the upper chord and the lower chord; and giving section information to the inner chord, the outer chord, the upper chord, the lower chord and the web members to complete the parametric modeling of the steel structure model. Compared with the traditional modeling mode, the parameterized modeling of the invention has excellent adjustability and good adaptability to the complex-shaped buildings.
Description
Technical Field
The invention relates to the technical field of BIM steel structure design, in particular to a parameterized modeling method for an assembled steel structure building.
Background
When a traditional steel structure is machined, a steel structure model is turned into by Tekla software according to a CAD two-dimensional drawing, and then component production is carried out according to the model, so that the method is labor-consuming and time-consuming, and needs to be checked repeatedly. After parametric modeling is adopted, the model can be directly transferred to Tekla software, because computer operation is adopted, the secondary modeling time of Tekla 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 of an assembled steel structure building, which has excellent adjustability and good adaptability to buildings with complex shapes.
The technical scheme adopted by the invention is as follows: a parametric modeling method for an assembled steel structure building comprises the following steps:
setting out an inner skin curved surface and an outer skin curved surface of the steel 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 and an outer chord of the vertical stress column at the intersection, and connecting a web member between the inner chord and the outer chord;
dividing the inner skin curved surface and the outer skin curved surface along the horizontal stress beam of the steel structure, connecting the dividing intersection points to form an upper chord and a lower chord of the horizontal stress beam, and connecting a web member between the upper chord and the lower chord;
and giving section information to the inner chord, the outer chord, the upper chord, the lower chord and the web members to complete the parametric modeling of the steel structure model.
In some embodiments of the parametric modeling method of the present invention, Grasshopper software is used to perform lofting of the inner skin curved surface and the outer skin curved surface, and to construct a steel structure model of the vertical force-bearing column and the horizontal force-bearing beam.
In some embodiments of the parametric modeling method of the present invention, after the parametric modeling of the steel structure model is completed, the method further includes the steps of:
leading the steel structure model into Midas software from the Grasshopper software, and carrying out structural stress analysis;
and after the stress analysis meets the requirements, importing the steel structure model into 3D3S software from the Midas software, and drawing a graph.
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 through the 3D3S software to deepen the steel structure.
In some embodiments of the parametric modeling method of the present invention, the steel structure is a petal tree structure, the vertical stressed column is an arc column, and the horizontal stressed 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 part, and the parametric modeling method further comprises the steps of:
the upper ends of the upper chord and the lower chord of the vertical stress column radially extend outwards to form chords of radial branches;
connecting chords for supporting branches between the chords of the adjacent radial branches;
connecting the end points of the chords of the radial branches to form chords for surrounding the branches;
and giving section information to the chords of the radial branches, the chords of the support branches and the chords of the surrounding enclosing branches to complete the parametric modeling of the steel structure model.
In some embodiments of the parametric modeling method of the present invention, a web member is connected between the chords of each radial branch, a web member is connected between the chords of each support branch, and a web member is connected between the chords of each surrounding branch.
In some embodiments of the parametric modeling method of the present invention, the trunk of the petal tree structure is in a bell mouth shape, the bottom of the trunk is in a circular shape, and the top of the trunk is in an oval shape, and the step of lofting the inner skin curved surface and the outer skin curved surface includes:
dividing the trunk into a plurality of sections along the height direction, wherein the shape of each section is changed from a circle to an ellipse from the bottom to the top;
and lofting the plurality of sections into a space curved surface to obtain an inner skin curved surface and an outer skin 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 using the vertical stress center of the steel structure as an axis and forming a plurality of surface units at equal radians, wherein the radians are smaller than or equal to the minimum spacing of the vertical stress columns;
and selecting corresponding surface units according to the axis position of the vertical stress column, cutting, and obtaining an inner chord and an outer chord of the vertical stress column at the intersection.
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 carry out equal radian segmentation, and connecting segmentation intersection points to form an upper chord and a lower chord of the annular beam;
and connecting the segmentation intersection points on the upper chord and the segmentation intersection points on the lower chord by means of array arrangement to form the web member.
Due to the adoption of 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-shaped buildings, Grasshopper (GH for short) software developed based on a Rhinoceros platform is adopted for building a structural model, Grasshopper is a visual node programming tool, modeling design is carried out in a program script mode, compared with the traditional programming of programming languages or manual CAD modeling, time is greatly saved, and only corresponding parameters need to be modified for modifying the model, so that a large amount of repeated labor is saved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a main flow chart of a parametric modeling method of a fabricated steel structure building according to an embodiment of the present invention.
FIG. 2 is a model diagram of the inner and outer epidermis of the trunk in the embodiment of the present invention.
FIG. 3 is a diagram of a model of the trunk according to an embodiment of the present invention.
Fig. 4 is a model diagram of trunk arc limbs in the embodiment of the invention.
Fig. 5 is a model view of a trunk ring beam in an embodiment of the present invention.
FIG. 6 is a diagram of a final trunk model according to an embodiment of the present invention.
FIG. 7 is a model diagram of a petal tree in an embodiment of the present invention.
FIG. 8 is a model diagram of a petal tree (with section information) in an embodiment of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
The parametric design and the BIM technology are developed rapidly in recent years as emerging technical means, and as a link in the parametric design, the parametric modeling has excellent adjustability and good adaptability to buildings with complex shapes compared with the traditional modeling mode. The method is characterized in that Grasshopper (GH for short) software developed secondarily based on a Rhinoceros platform is adopted for building a structural model, the Grasshopper is a visual node programming tool, and modeling design is carried out in a program script mode.
When a traditional steel structure is machined, a steel structure model is turned into by Tekla software according to a CAD two-dimensional drawing, and then component production is carried out according to the model, so that the method is labor-consuming and time-consuming, and needs to be checked repeatedly. After parametric modeling is adopted, the model can be directly transferred to Tekla software, because computer operation is adopted, the secondary modeling time of Tekla is negligible, errors can not occur, and the workload of steel structure deepening designers is greatly reduced.
The invention is described in further detail below with reference to the figures and specific examples.
Referring to fig. 1, an embodiment of the present invention provides a parameterized modeling method for an assembled steel structure building, which mainly includes the following steps:
step S1: setting out an inner skin curved surface and an outer skin curved surface of the steel tapping structure;
step S2: 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 and an outer chord of the vertical stress column at the intersection, and connecting a web member between the inner chord and the outer chord;
step S3: dividing the inner skin curved surface and the outer skin curved surface along the horizontal stress beam of the steel structure, connecting the dividing intersection points to form an upper chord member and a lower chord member of the horizontal stress beam, and connecting a web member between the upper chord member and the lower chord member;
step S4: and giving section information to the inner chord, the outer chord, the upper chord, the lower chord and the web members to complete the parametric modeling of the steel structure model.
Wherein, the steel structure models built in the steps S1-S4 are built by Grasshopper (GH for short) software based on the secondary development of the Rhinoceros platform. The Grasshopper is a visual node programming tool, modeling design is carried out in a program script mode, compared with the traditional programming of program languages or manual CAD modeling, time is greatly saved, and a large amount of repeated labor is saved as only corresponding parameters are needed to be modified for modifying the model.
After the step S1-S4 of parametric modeling of the steel structure model is completed, the method may further include the steps of:
in the design stage: leading the steel structure model into Midas software from Grasshopper software, and carrying out structural stress analysis; after the stress analysis meets the requirements, the steel structure model is led into 3D3S software from Midas software, and drawing is carried out; and
in the production stage: and importing the steel structure model into a Tekla model through the 3D3S software to deepen the steel structure.
In the construction stage: through the Tekla model and relevant BIM software, the whole construction process is simulated, the optimized construction flow is made, and the construction management and control are convenient to carry out.
The invention adopts a Grasshopper software-based space parameterization modeling method, and solves the design problem of the space steel structure. The following petal tree steel structure is taken as an example, and parameterized design steps are introduced one by one.
Referring to fig. 7 and 8, a three-dimensional modeling diagram of the spatial steel structure of the petal tree of the embodiment is shown, wherein the spatial steel structure system of the petal tree is divided into two parts, namely 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 dead weight of the structure; the horizontal stress system consists of 9 annular stress beams, namely annular beams 12, and plays a horizontal constraint role on the arc-shaped column 11.
Because the whole structure system is irregular, the conventional CAD design is difficult to complete, the parameterization design is simple and easy to implement, and the petal column is divided into a trunk and a branch during the design. The following steps are carried out:
step 1: trunk modeling
1. Establishing the inner and outer epidermis of the trunk
As shown in FIG. 2, the trunk has an inner and outer skin shape, a round bottom and an oval top, and is flared as a whole. Based on Grasshopper software, the method is realized by a program: the method comprises the steps of firstly establishing an inner skin 101, determining geometric parameters of a model by using a geometric relation, dividing a trunk into 9 sections along the height direction, changing the sections from a circle to an ellipse from the bottom to the top, lofting into a space curved surface by a loft command, and then establishing an outer skin 102 in the same manner.
2. Cutting the inner and outer skins of the trunk to form a trunk chord
As shown in fig. 3, an array is formed by the surface units along the Z axis (the steel structure vertical stress central axis) at equal radians to form 16 surfaces (the radian is preferably the minimum distance of the arc-shaped column), 10 of the surfaces are selected as a cutting surface 104 (preferably the surface where the steel structure arc-shaped column central axis is located), the inner and outer skins of the trunk are cut, and the inner chord 111 and the outer chord 112 of 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 built trunk
Referring to fig. 4, the inner chords 111 and outer chords 112 of the inner and outer epidermis of the trunk are connected to the web 113 of the through column by means of space point finding, array sorting and the like, so as to form 10 arc-shaped columns 11. The inner chord 111, the outer chord 112 and the column web 113 form a structural line structure of the arc column 11 (the structural line structure is a central axis of each rod section of the arc column, and after being endowed with section information of the sections, an arc column complete model can be constructed and formed). The method comprises the following steps: a. dividing the inner and outer skins of the trunk into 25 circles of nodes (200 parts along the circumference) along the vertical direction by a plane division command; b. establishing a circle to intersect with 10 internal and external chords of the trunk by taking the node as the center of the circle, and taking an intersection point; c. the inner and outer chord upper crossing points are arranged in groups, and the connecting lines form the column web member 113. Parameters were established based on Grasshopper software.
4. Ring beam for building tree trunk
As shown in fig. 5, by means of sorting and searching, array sorting and the like, an upper chord 121 and a lower chord 122 of the ring beam 12 are established, and the chords are connected by web members 123 to form 8 ring beams. The method comprises the following steps: a. selecting 9 circles/ellipses of the inner skin of the trunk built in the step 1, respectively carrying out equal radian segmentation, and connecting segmentation intersection points to form upper and lower chords of a ring beam; b. the upper chord division intersection point and the lower chord division intersection point are connected through array arrangement to form the beam web member. Parameters were established based on Grasshopper software.
The trunk final model effect is shown in figure 6.
Step 2: branch modeling
The branch model is shown in figure 7, the branches are divided into three types, one type is a radial branch 131, and the radial branch and 10 arc-shaped columns 11 form a whole; one type is a support branch 132 between radial branches; one type is a four sided enclosure branch 133. Parameters were established based on Grasshopper software. The method specifically comprises the following steps: a. the upper ends of the chord members of the arc-shaped columns radially extend outwards to form chord members of radial branches; b. connecting chords for supporting branches between chords of adjacent radial branches; c. connecting the end points of the chords of the radial branches to form chords for surrounding the branches; d. and giving section information to the chords of the radial branches, the chords for supporting the branches and the chords for surrounding and enclosing the branches, so as to complete the parametric modeling of the steel structure model. Wherein, be connected with the web member between the chord member of every radial branch, be connected with the web member between the chord member of every support branch, be connected with the web member between the chord member of every envelope branch all around to give section bar section information, accomplish steel structure model's parametric modeling.
And step 3: final model completion
The petal tree model is shown in figure 7, and the model is shown in figure 8 after the section information of each rod piece section is given, so that all the parametric modeling work is completed.
And (4) follow-up 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 (4) importing the parameterized modeling result of the grasshopper into the structure design software Midas to carry out structure stress analysis. And (4) after the stress analysis meets the requirements, importing the Midas model into structural software 3D3S, and drawing a graph through 3D 3S.
2. Production stage
The 3D3S model is led into the Tekla model, so that deepening drawing of the steel structure can be conveniently tapped, and for the arc-shaped rod piece, model parameters are input into equipment to directly produce the arc-shaped member.
3. Construction stage
Through the Tekla model and relevant BIM software, the whole construction process is simulated, the optimized construction flow is made, and the construction management and control are convenient to carry out.
By adopting the technical scheme, the invention has the beneficial effects that:
1. by applying 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 the complex-shaped buildings. The Grasshopper is a visual node programming tool, modeling design is carried out in a program script mode, compared with the traditional programming of program languages or manual CAD modeling, time is greatly saved, and a large amount of repeated labor is saved as only corresponding parameters are needed to be modified for modifying the model.
3. Through the conversion of the Grasshopper model → Midas → 3D3S, the automatic drawing of the structural construction drawings in batches can be realized without drawing extra time for drawing.
4. Through the conversion of the Grasshopper model → Midas → 3D3S → Tekla, the automatic structure processing detailed drawing output in batch can be realized, the accuracy of 100% can be ensured, and parameters can be input into factory equipment for production.
5. Through the Tekla model and relevant BIM software, the whole construction process is simulated, the optimized construction flow is made, and the construction management and control are convenient to carry out.
6. And establishing a space model by using programming languages such as space point finding, classification retrieval, array sequencing and the like.
It should be noted that the structures, ratios, sizes, and the like shown in the drawings attached to the present specification are only used for matching the disclosure of the present specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions of the present invention, so that the present invention has no technical essence, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A parametric modeling method for an assembled steel structure building is characterized by comprising the following steps:
setting out an inner skin curved surface and an outer skin curved surface of the steel 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 and an outer chord of the vertical stress column at the intersection, and connecting a web member between the inner chord and the outer chord;
dividing the inner skin curved surface and the outer skin curved surface along the horizontal stress beam of the steel structure, connecting the dividing intersection points to form an upper chord and a lower chord of the horizontal stress beam, and connecting a web member between the upper chord and the lower chord;
and giving section information to the inner chord, the outer chord, the upper chord, the lower chord and the web members to complete the parametric modeling of the steel structure model.
2. The parametric modeling method of an assembled steel structure building of claim 1, wherein: and adopting Grasshopper software to perform lofting of the inner skin curved surface and the outer skin curved surface, and constructing steel structure models of the vertical stress column and the horizontal stress beam.
3. The parametric modeling method of an assembled steel structure building of claim 2, further comprising the step of, after completing the parametric modeling of the steel structure model:
leading the steel structure model into Midas software from the Grasshopper software, and carrying out structural stress analysis;
and after the stress analysis meets the requirements, importing the steel structure model into 3D3S software from the Midas software, and drawing a graph.
4. The parametric modeling method for an assembled steel structure building of claim 3, further comprising the steps of: and importing the steel structure model into a Tekla model through the 3D3S software to deepen the steel structure.
5. The parametric modeling method for the assembled steel structure building as claimed in any one of claims 1 to 4, wherein 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.
6. The parametric modeling method for an assembled steel structure building of claim 5, wherein 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 and the lower chord of the vertical stress column radially extend outwards to form chords of radial branches;
connecting chords for supporting branches between the chords of the adjacent radial branches;
connecting the end points of the chords of the radial branches to form chords for surrounding the branches;
and giving section information to the chords of the radial branches, the chords of the support branches and the chords of the surrounding enclosing branches to complete the parametric modeling of the steel structure model.
7. The parametric modeling method for the fabricated steel structure building of claim 6, wherein a web member is connected between the chords of each radial branch, a web member is connected between the chords of each supporting branch, and a web member is connected between the chords of each surrounding enclosing branch.
8. The parametric modeling method for the assembled steel structure building as claimed in claim 5, wherein the stem of the petal tree structure has a bell mouth shape, a circular bottom and an elliptical top, and the step of laying out the inner skin curved surface and the outer skin curved surface comprises:
dividing the trunk into a plurality of sections along the height direction, wherein the shape of each section is changed from a circle to an ellipse from the bottom to the top;
and lofting the plurality of sections into a space curved surface to obtain an inner skin curved surface and an outer skin curved surface of the trunk.
9. The parametric modeling method for an assembled steel structure building of claim 1, wherein the step of cutting the inner skin surface and the outer surface comprises:
forming an array by using the vertical stress center of the steel structure as an axis and forming a plurality of surface units at equal radians, wherein the radians are smaller than or equal to the minimum spacing of the vertical stress columns;
and selecting corresponding surface units according to the axis position of the vertical stress column, cutting, and obtaining an inner chord and an outer chord of the vertical stress column at the intersection.
10. The parametric modeling method for an assembled steel structure building of claim 8, wherein the step of dividing the inner skin surface and the outer skin surface comprises:
selecting a plurality of sections to respectively carry out equal radian segmentation, and connecting segmentation intersection points to form an upper chord and a lower chord of the annular beam;
and connecting the segmentation intersection points on the upper chord and the segmentation intersection points on the lower chord by means of array arrangement to form the web member.
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| CN111414661A (en) * | 2020-03-31 | 2020-07-14 | 北京市建筑设计研究院有限公司 | Design method for forming strip-shaped curved surface building skin by utilizing linear section bars |
| CN111414662A (en) * | 2020-03-31 | 2020-07-14 | 北京市建筑设计研究院有限公司 | Method for splicing strip-shaped curved surface building skin by utilizing linear section bars |
| 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 |
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