CN103678820A - Grid partitioning method used for building structure geometrical information model - Google Patents
Grid partitioning method used for building structure geometrical information model Download PDFInfo
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Abstract
The invention discloses a grid partitioning method used for a building structure geometrical information model. The grid partitioning method includes the following steps that according to the arrangement of the building structure model, boundary points are coordinated; according to different components of a building structure, grid partitioning is performed on the corresponding components, and for the frame component, two-point units are directly generated, free grid partitioning is adopted for a floor plate or a basic raft, a shear wall is distinguished into a straight wall and a curved surface wall, whether the straight wall can be split or not is judged, mapping grid partitioning or the free grid partitioning is adopted, for the curved surface wall, the curved surface is firstly mapped to a parameter plane, then the mapping grid partitioning or the free grid partitioning is selected based on whether the curved surface wall can be split or not, and finally grids on the parameter plane are mapped to the original space curved surface to obtain curved surface grids. The grid partitioning performed on the building structure geometrical information model is achieved, and the grid partitioning method can be used for any complex building structure and is very high in generality.
Description
Technical field
The present invention relates to BIM (BIM) field, particularly relate to a kind of method of dividing for building structure geometric information model grid.
Background technology
Up to now, the development of computer technology had twice revolutionary contribution to building trade, CAD(Computer Aided Design for the first time) technology replaces traditional drawing, be BIM (Building Information Modeling) for the second time, be conventionally translated as " BIM ".The former is the transformation on instrument, and the latter is the transformation in thinking; The former only affects the design phase of building structure, and the latter will be run through the Life cycle (containing planning, design, construction, O&M etc.) of building structure.Therefore concerning building trade, BIM once impacts more up hill and dale and changes.
The content that BIM comprises is very wide, and wherein the safety analysis of building structure and Analysis of Comfort are one of substances.For this class problem, follow computing machine and the Finite Element Method that grows up has become main stream approach.The basic thought of finite element is " first discrete rear integrated ", therefore for obtaining Finite-Element Solution, must first to structure, carry out finite element discretization, and grid is divided.Grid can be divided into map grids (structured grid) and free grid (unstructured grid) dividing from topological relation.Map grids refers to that the topological relation of inner node is consistent, that is to say that each inner node all connects the unit of similar number, the generating mode of this grid is very simple, it is very fast that grid is divided speed, mesh quality is also fine, but it is only applicable to special geometrical boundary, very restricted in Practical Project.Free grid refers to that the topological relation of inner node can be any, that is to say that each inner node can connect node and the unit of arbitrary number, the generating mode of this grid is comparatively complicated, but is applicable in theory complicated arbitrarily geometrical boundary, therefore in common software, is widely adopted.
The basic demand that grid is divided is " can adapt to all kinds of complex geometry boundaries, grid discrete results can truly reflect original geometry model ", and in order to adapt to the requirement of finite element analysis, grid is divided also needs to meet following several condition:
Border susceptibility: because result of finite element is very responsive to border grid, need the preferential quality that guarantees border grid when grid is divided, allow as far as possible border grid and boundary shape be consistent to guarantee homogeneity and the Founder of border grid;
Orientation independent: rotation or given geometric areas of conversion can not change the result that its grid is divided, that is to say, the result that grid is divided determines by region shape, and irrelevant with the selection of global coordinate, to avoid the selection of global coordinate to affect result of finite element;
Singular point number is less and away from border: for quadrilateral mesh, singular point refers to that the number of unit being attached thereto is not equal to 4 internal node, and for triangular mesh, singular point refers to that the number of unit being attached thereto is not equal to 6 internal node.This is a very crucial problem during grid is divided, because the quantity of singular point and position will directly determine the final mesh quality after optimization.As a rule, free grid occurs that singular point is inevitable in dividing, but can reduce by algorithm optimization the number of singular point as far as possible, avoid as far as possible singular point to appear at boundary vicinity, because border grid is more remarkable on the impact of finite element result simultaneously.
From the angle of finite element, grid is divided and is not only its prerequisite and basis, and mesh quality also will directly affect reliability and the accuracy of finite element result simultaneously.In fact, at the commitment of finite element development, it was once a key factor of restriction finite element analysis application and popularization that grid is divided, even if to today, the automatic partitioning technology of grid is still perfect not.Just because of this, in recent decades, whole world Ge great colleges and universities, company, scientific research institution have all dropped into a large amount of manpower and materials and have carried out correlative study, have developed various grid partitioning algorithm.But these algorithms are substantially all for general geometric model (especially mechanical model), there is no to consider the singularity of (utilizing in other words) building structure, if be directly used for, carrying out building structure grid, to divide its effect not very good, therefore about the grid of building structure, divides and also need to do targetedly to specialize in.
Summary of the invention
The deficiency existing for overcoming above-mentioned prior art, the present invention's fundamental purpose is to provide a kind of method of dividing for building structure geometric information model grid, it has considered the singularity of building structure, having realized the grid of building structure geometric information model divides, can be used for any Structure in Complex Structure, there is very strong versatility.
For reaching above-mentioned and other object, the present invention proposes a kind of method of dividing for building structure geometric information model grid, comprises the steps:
Further, in step 2, free grid is divided into and adopts pitching method to carry out the free grid division of pure quadrilateral to arbitrary plane pel.
Further, this free grid is divided and is comprised the steps:
Step 3.1, forms initialization boundary node according to the density of the grid that will divide and the big or small fixed boundary along arbitrary plane figure;
Step 3.2, those nodes are formed to a doubly linked list, select quadrilateral mesh from outer fixed boundary inwards, inner boundary outwards starts to pave from level to level, pave after one deck, outer fixed boundary upgrades inwards and forms mobile outer boundary, and interior fixed boundary outwards upgrades and forms mobile inner boundary;
Step 3.3, the moving boundary that forms of take repeats abovementioned steps until fill up whole region as outer boundary, inner boundary;
Step 3.4, when mobile outer boundary node and the approaching appointment of mobile inner boundary nodal pitch sizing grid, start unit closed pair node closed-loop is sealed processing;
Step 3.5, the floating algorithm of associating weighting Laplce and the floating algorithm of constraint Laplce carry out floating to grid node.
Further, in step 3.1, pave the node on border outward by counterclockwise arranging, inside pave the node on border and arrange in the direction of the clock.
Further, in step 3.4, sealing process comprise that knot removal, unit open, unit closure, cell translation, element sides deletion, Compound Topology optimization.
Further, in step 3.5, the floating vector of Laplace method computing node routinely, then judge whether this floatingly can guarantee that mesh quality increases, if it is carry out this floating, no person reduces by half floating amount, if floating amount is too small after reducing by half, abandons floatingly, otherwise repeats above-mentioned steps.
Further, in step 2, for basic raft plate, also need process for restrained boundary problem in the territory of basic raft plate, this processing operation comprises following two parts: (1) is when paving grid, whether Dou Hui judging area, a new unit of every generation there is isolated approximately end node, if had, processes this node; (2) initial restrained boundary is modeled to crack edge, then for this crack edge, generate the closed border of broad sense and carry out grid and pave, and for the situation of restrained boundary self intersection, according to joining position, be modeled to composite mode crack border, then carry out grid and pave.
Further, for composite mode crack border grid, divide, first along broad sense inner boundary, pave quadrilateral mesh unit, secondly along broad sense outer boundary, pave quadrilateral mesh unit, again along mobile inside/outside border, continue to pave quadrilateral mesh unit, finally by free grid, divided paving of all quadrilateral meshs.
Further, in step 2, for curved wall, combined parameters space law and pitching method carry out quadrangular mesh partition, and the grid problem of space curved surface is converted to plane grid problem, after grid is divided, by coordinate transform, shine upon back original three dimensions.
Further, in step 2, for splitting for how much of shear wall structure, adopt with the following method: for the shear wall without hole, do not have fractionation; For the shear wall that has hole, in most cases all can carry out geometry and split; Slope roof wall or trapezoidal wall for part with hole, further judge splitting condition according to openings position.
Compared with prior art, a kind of method of dividing for building structure geometric information model grid of the present invention be take pitching method as core, Joint Mapping grid and how much Split Methods, and take into account the versatility of free grid and the high efficiency of map grids, realize the grid of building structure geometric information model and divided, can be used for any Structure in Complex Structure, there is very strong versatility, the present invention's simultaneously Meshing Method becomes more uniform Coordination Model by structural separation, is applicable to finite element analysis.
Accompanying drawing explanation
Fig. 1 is the flow chart of steps of a kind of method of dividing for building structure geometric information model grid of the present invention;
Fig. 2 is the free grid schematic diagram of pitching method in preferred embodiment of the present invention;
Fig. 3 is that in preferred embodiment of the present invention, space surface mesh is divided the schematic diagram of (take round platform and cylinder as example);
Fig. 4 is that in preferred embodiment of the present invention, about end node is processed schematic diagram;
Fig. 5 retrains line segment processing schematic diagram in preferred embodiment of the present invention;
Fig. 6 is that in preferred embodiment of the present invention, a composite mode crack border grid is divided example;
Fig. 7 is shear wall split mode schematic diagram in preferred embodiment of the present invention;
Fig. 8 is the flow chart of steps of the preferred embodiment of a kind of method of dividing for building structure geometric information model grid of the present invention.
Embodiment
Below, by specific instantiation accompanying drawings embodiments of the present invention, those skilled in the art can understand other advantage of the present invention and effect easily by content disclosed in the present specification.The present invention also can be implemented or be applied by other different instantiation, and the every details in this instructions also can be based on different viewpoints and application, carries out various modifications and change not deviating under spirit of the present invention.
Fig. 1 is the flow chart of steps of a kind of method of dividing for building structure geometric information model grid of the present invention.As shown in Figure 1, a kind of method of dividing for building structure geometric information model grid of the present invention, comprises the steps:
Step 101, arranges orchestration boundary point (coordination of beam column buttress plate) for building structure model.
Step 102, carries out respective members gridding according to the different component of building structure and divides, if framing component directly generates 2 node units; If floor or basic raft plate adopt free grid to divide; If shear wall is distinguished stalk and curved wall, for stalk, directly can judgement split and adopt map grids or free grid to divide, for curved wall, first curved surface is mapped to parameter plane, then according to splitting to select map grids or free grid, finally again parameter plane mesh mapping is returned to luv space curved surface to obtain surface mesh.
Below the grid of different component in step 102 is divided and is described further:
1.1, adopting pitching method to carry out the free grid of pure quadrilateral to arbitrary plane pel divides.Its concrete steps are as follows: according to the density of the grid that will divide and size along the fixed boundary of arbitrary plane figure (interior fixed boundary or outer fixed boundary) formation initialization boundary node, wherein, pave the node on border outward by counterclockwise arranging, inside pave the node on border and arrange in the direction of the clock; These nodes form a doubly linked list, select quadrilateral mesh from outer fixed boundary inwards, inner boundary outwards starts to pave from level to level, pave after one deck, outer fixed boundary upgrades inwards and forms mobile outer boundary, interior fixed boundary outwards upgrades and forms mobile inner boundary, in this process, between moving boundary self and moving boundary and former fixed boundary, may occur that intersect on border or folding situation, now need that unit is carried out to corresponding stitching and process to guarantee independence and the closed on every border; Take the moving boundary (mobile outer boundary, mobile inner boundary) that forms for outer boundary, inner boundary repetition abovementioned steps are until fill up whole region; When mobile outer boundary node and the approaching appointment of mobile inner boundary nodal pitch sizing grid, start unit closed pair node closed-loop is sealed processing, specifically comprises that knot removal, unit open, unit closure, cell translation, element sides deletion, Compound Topology optimization etc.; The floating algorithm of associating weighting Laplce and the floating algorithm of constraint Laplce carry out floating to grid node, concrete thought is: the floating vector of Laplace method computing node routinely, then judge whether this floatingly can guarantee that mesh quality increases, if it is carry out this floating, otherwise floating amount is reduced by half, if floating amount is too small after reducing by half, abandon floatingly, otherwise repeat to appeal step.
Fig. 2 is the free grid schematic diagram of pitching method in preferred embodiment of the present invention.First along outer fixed boundary, pave quadrilateral mesh unit, then an optional interior fixed boundary is paved quadrilateral mesh unit, by the visible moving boundary forming of paving for twice of Fig. 2 (a), at A place, exist overlapping, now relevant grid cell being carried out to corresponding stitching processes to guarantee independence and the closed on every border, after processing, continue to carry out paving of quadrilateral mesh unit along fixed boundary in another, as overlapping being eliminated at the visible A of Fig. 2 (b) place, but the moving boundary that occurs again B1 and B2 place while paving new grid cell is overlapping, the relevant grid cell at B1 and B2 place is carried out to corresponding stitching to be processed, and continue to pave quadrilateral mesh unit, as shown in Fig. 2 (c), so continue to pave quadrilateral mesh unit, when occurring that moving boundary is crossing or folding, relevant grid cell is sewed up to processing, until complete the grid of whole plane pel, pave.About the crossing processing in border, must observe even number joint constraint (node of Arbitrary Boundaries adds up to even number) and grid optimization criteria, be broadly divided into following 4 kinds of situations: (1) directly merges intersect boundary, as the B1 of the A of Fig. 2 (a), Fig. 2 (b) and B2 place; (2) stagger and merge the border of closing on intersection location, as the C place of Fig. 2 (c); (3) insert auxiliary border, a unit and intersect processing, as the D2 place of Fig. 2 (d); (4) delete certain unit with the border quality after guaranteeing to intersect, as the E place of the D1 and 2 (e) of Fig. 2 (d).
1.2, for the developable space Surface Problems of building structure, combined parameters space law and pitching method carry out quadrangular mesh partition, and the grid problem of space curved surface is converted to plane grid problem, then by coordinate transform, shine upon back original three dimensions.Idiographic flow is as follows: first according to curved surface self-characteristic (such as cylinder, round table surface, hyperboloid, parabola etc.), expanded into plane, planar carry out free grid division (seeing 1.1), then plane grid is shone upon back to luv space curved surface and obtain surface mesh (its mapping function is relevant with the concrete form of curved surface), take round platform and Cylinder Surface as example, its grid is divided as shown in Figure 3, and Fig. 3 (a) divides schematic diagram with the surface mesh that Fig. 3 (b) is respectively round platform and cylinder.
1.3, for restrained boundary problem in the territory of basic raft plate (fixed point alignment problem), its basic operation mainly comprises two parts: (1) is when paving grid, new unit of every generation all can judge whether this region exists isolated approximately end node (fixed point), if had, process this node, specifically as shown in Figure 4, to building structure, the quadrilateral mesh of dividing generally can not comprise a lot of restraint joints, if only have a restraint joint in quadrilateral units, delete the grid node close to from this restraint joint, using this restraint joint 4 quadrilateral units that reconstruct closes on as grid node, if only have two restraint joints in quadrilateral units, delete two grid nodes close to from this restraint joint, using these two restraint joints 6 quadrilateral units that reconstruct closes on as grid node, when two restraint joints in quadrilateral units just in time have one to be grid node, problem deteriorates to the situation of only having a restraint joint in quadrilateral units, when there are 3 nearer restraint joints, select two restraint joints to make quadrilateral units grid node, its the 3rd restraint joint can only be positioned at certain quadrilateral units, problem deteriorates to the situation of only having a restraint joint in quadrilateral units, when there are four nearer restraint joints, directly using the grid node of these 4 restraint joints as quadrilateral units, when there are 5 nearer restraint joints, directly using the grid node of these 4 restraint joints as quadrilateral units, it is inner that its 5th restraint joint is placed in this quadrilateral units, problem deteriorates to the situation of only having a restraint joint in quadrilateral units, (2) initial restrained boundary is modeled to crack edge, then for this crack edge, generate the closed border of broad sense and carry out grid and pave, when constraint line segment and border are crossing, take original boundaries the end of as, constraint line segment is that waist generation area is zero the closed border of broad sense, take the closed border of this broad sense as interior fixed boundary is by above-mentioned 1.1 generation quadrilateral mesh unit, when constraint line segment and border independence, the constraint line segment of take is the zero closed border of broad sense as diagonal line generates area, take the closed border of this broad sense as interior fixed boundary is by above-mentioned 1.1 generation quadrilateral mesh unit, and for the situation of restrained boundary self intersection, according to joining position, be modeled to composite mode crack border, then carrying out grid paves, specifically as shown in Figure 5, Fig. 5 (a), (b), (c) show respectively the constraint line segment being connected with border, independently retrain line segment and compound constant line segment with border.At this, it should be noted that: owing to retraining the self intersection of line segment and intersecting with original inner and outer boundary, the generalized boundary finally forming is quantity or shape all may be completely different from original boundaries, than composite mode crack border as shown in Figure 5 c, its broad sense outer boundary forms by retraining the original inner and outer boundary of segment link, broad sense inner boundary forms by retraining line segment self intersection, total boundary number becomes final two from original three, but boundary shape is complicated a lot.Figure 6 shows that a composite mode crack border grid division example, first along broad sense inner boundary, pave quadrilateral mesh unit, as shown in Figure 6 a, secondly along broad sense outer boundary, pave quadrilateral mesh unit, as shown in Figure 6 b, again along mobile inside/outside border, continue to pave quadrilateral mesh unit, as shown in Fig. 6 c, finally by above-mentioned 1.1, complete paving of all quadrilateral meshs, as shown in Fig. 6 d.
1.4, for shear wall structure, carry out geometry and split, make it to become wall beam and wall column in structural meaning, be convenient to follow-up internal force statistics and structural design.It is more difficult as a rule splitting for how much, but shear wall structure has certain regularity, the shape of its monolithic wall is relatively fixing, is exactly that a quadrilateral outer boundary adds a quadrilateral hole conventionally, and this hole may be placed in the middle, also may keep to the side, in most cases all can carry out geometry and split, specifically as shown in Figure 7, and for part slope roof wall or the trapezoidal wall with hole, to further judge splitting condition according to openings position, in particular cases may not split.Table 1 is for the shear wall split mode table of Fig. 7:
| Hole type | Split piece | Hole type | Split piece |
| Without hole | — | Hole, the lower left corner | ④⑤⑥ |
| Inner hole | ①②③④⑤⑥⑦⑧ | Hole, the upper left corner | ②③④ |
| Hole, the left side | ②③④⑤⑥ | Hole, the lower right corner | ⑥⑦⑧ |
| Hole, the right | ①②⑥⑦⑧ | Hole, the upper right corner | ①②⑧ |
| Hole, top | ①②③④⑧ | Left Ban Qiang |
④ |
| Following hole | ④⑤⑥⑦⑧ | Right Ban Qiang hole | ⑧ |
| Lateral direction penetrating | ②⑥ | |
② |
| Vertical perforation | ④⑧ | |
⑥ |
Visible, in the specific embodiment of the invention:
During without hole there is not fractionation in shear wall;
8. 7. 6. 5. 4. 3. 2. 1. inner hole shear wall be split as totally 8 plane pels;
6. 5. 4. 3. 2. hole, left side shear wall be split as totally 5 plane pels;
8. 7. 6. 2. 1. the right hole shear wall be split as totally 5 plane pels;
8. 4. 3. 2. 1. hole, top shear wall be split as totally 5 plane pels;
Below 8. 7. 6. 5. 4. hole shear wall be split as totally 5 plane pels;
6. 2. lateral direction penetrating shear wall be split as totally 2 plane pels;
8. 4. the vertical shear wall that connects be split as totally 2 plane pels;
6. 5. 4. hole, lower left corner shear wall be split as totally 3 plane pels;
4. 3. 2. hole, upper left corner shear wall be split as totally 3 plane pels;
8. 7. 6. hole, lower right corner shear wall be split as totally 3 plane pels;
8. 2. 1. hole, upper right corner shear wall be split as totally 3 plane pels;
4. left Ban Qiang hole shear wall is split as totally 1 plane pel;
8. right Ban Qiang hole shear wall is split as totally 1 plane pel;
First wall hole shear wall is split as 2. 1 plane pel;
Second wall hole shear wall is split as 6. 1 plane pel.
Fig. 8 is the flow chart of steps of the preferred embodiment of a kind of method of dividing for building structure geometric information model grid of the present invention.As shown in Figure 8, the preferred embodiment step of a kind of method of dividing for building structure geometric information model grid of the present invention is as follows: the geological information of input building structure; According to the geological information of building structure, arrange orchestration boundary node; The different component of building structure is carried out to component grid to be divided: to framing component, (beam column support) is directly divided into 2 node units; To floor or basic raft plate, adopt free grid to divide (specifically seeing above-mentioned 1.1 and 1.3); For shear wall, judgement is stalk or curved wall; For stalk, directly judge whether to split border, for curved wall, curved wall is expanded into after planar walls (specifically seeing above-mentioned 1.2), then judge whether to split border; If can split border, carry out geometry and split (specifically seeing above-mentioned 1.4), then judge whether to meet mapping condition, if can not split border, judge whether to meet mapping condition; If meet mapping condition, adopt map grids to divide, otherwise adopt free grid to divide (specifically seeing above-mentioned 1.1); Determine whether Developing Surface; If plane grid be mapped as to space curved surface (specifically seeing above-mentioned 1.2) and finish, otherwise directly finishing.
In sum, a kind of method of dividing for building structure geometric information model grid of the present invention be take pitching method as core, Joint Mapping grid and how much Split Methods, and take into account the versatility of free grid and the high efficiency of map grids, realize the grid of building structure geometric information model and divided, can be used for any Structure in Complex Structure, there is very strong versatility, the present invention's simultaneously Meshing Method becomes more uniform Coordination Model by structural separation, is applicable to finite element analysis.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any those skilled in the art all can, under spirit of the present invention and category, modify and change above-described embodiment.Therefore, the scope of the present invention, should be as listed in claims.
Claims (10)
1. a method of dividing for building structure geometric information model grid, comprises the steps:
Step 1, arranges orchestration boundary point for building structure model;
Step 2, carries out the division of respective members grid according to the different component of this building structure, for framing component, directly generates 2 node units; For floor or basic raft plate, adopt free grid to divide; For shear wall, distinguish stalk and curved wall, for stalk, directly judge that can it split and adopt map grids or free grid to divide, for curved wall, first curved surface is mapped to parameter plane, then according to splitting to select map grids or free grid to divide, finally again parameter plane mesh mapping is returned to luv space curved surface to obtain surface mesh.
2. a kind of method of dividing for building structure geometric information model grid as claimed in claim 1, is characterized in that: in step 2, free grid is divided into and adopts pitching method to carry out the free grid division of pure quadrilateral to arbitrary plane pel.
3. a kind of method of dividing for building structure geometric information model grid as claimed in claim 2, is characterized in that, this free grid is divided and comprised the steps:
Step 3.1, forms initialization boundary node according to the density of the grid that will divide and the big or small fixed boundary along arbitrary plane figure;
Step 3.2, those nodes are formed to a doubly linked list, select quadrilateral mesh from outer fixed boundary inwards, inner boundary outwards starts to pave from level to level, pave after one deck, outer fixed boundary upgrades inwards and forms mobile outer boundary, and interior fixed boundary outwards upgrades and forms mobile inner boundary;
Step 3.3, the moving boundary that forms of take repeats abovementioned steps until fill up whole region as outer boundary, inner boundary;
Step 3.4, when mobile outer boundary node and the approaching appointment of mobile inner boundary nodal pitch sizing grid, start unit closed pair node closed-loop is sealed processing;
Step 3.5, the floating algorithm of associating weighting Laplce and the floating algorithm of constraint Laplce carry out floating to grid node.
4. a kind of method of dividing for building structure geometric information model grid as claimed in claim 3, is characterized in that: in step 3.1, pave the node on border outward by counterclockwise arranging, inside pave the node on border and arrange in the direction of the clock.
5. a kind of method of dividing for building structure geometric information model grid as claimed in claim 3, it is characterized in that: in step 3.4, sealing process comprise that knot removal, unit open, unit closure, cell translation, element sides deletion, Compound Topology optimization.
6. a kind of method of dividing for building structure geometric information model grid as claimed in claim 3, it is characterized in that: in step 3.5, the floating vector of Laplace method computing node routinely, then judge whether this floatingly can guarantee that mesh quality increases, if it is carry out this floating, no person reduces by half floating amount, if floating amount is too small after reducing by half, abandons floatingly, otherwise repeats above-mentioned steps.
7. a kind of method of dividing for building structure geometric information model grid as claimed in claim 1, it is characterized in that, in step 2, for basic raft plate, also need process for restrained boundary problem in the territory of basic raft plate, this processing operation comprises following two parts: (1), when paving grid, whether Dou Hui judging area, a new unit of every generation exists isolated approximately end node, if had, processes this node; (2) initial restrained boundary is modeled to crack edge, then for this crack edge, generate the closed border of broad sense and carry out grid and pave, and for the situation of restrained boundary self intersection, according to joining position, be modeled to composite mode crack border, then carry out grid and pave.
8. a kind of method of dividing for building structure geometric information model grid as claimed in claim 7, it is characterized in that: for composite mode crack border grid, divide, first along broad sense inner boundary, pave quadrilateral mesh unit, secondly along broad sense outer boundary, pave quadrilateral mesh unit, again along mobile inside/outside border, continue to pave quadrilateral mesh unit, finally by free grid, divided paving of all quadrilateral meshs.
9. a kind of method of dividing for building structure geometric information model grid as claimed in claim 1, it is characterized in that: in step 2, for curved wall, combined parameters space law and pitching method carry out quadrangular mesh partition, the grid problem of space curved surface is converted to plane grid problem, after grid is divided, by coordinate transform, shines upon back original three dimensions.
10. a kind of method of dividing for building structure geometric information model grid as claimed in claim 1, is characterized in that, in step 2, for splitting for how much of shear wall structure, adopts with the following method: for the shear wall without hole, do not have fractionation; For the shear wall that has hole, in most cases all can carry out geometry and split; Slope roof wall or trapezoidal wall for part with hole, further judge splitting condition according to openings position.
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