BIM-based rapid modeling system and method for three-dimensional curved surface plate of steel box girder bridge

Abstract

The scheme belongs to the technical field of bridge design modeling, and particularly relates to a rapid modeling system and method for a three-dimensional curved panel of a steel box girder bridge based on BIM. The system comprises TeklaStructure software, which comprises a parameter input module, a parameter conversion module and a model generation module. The parameter input module extracts control parameters through a window input key point, selects route linear data of a CAD format file through a window button, automatically opens AutoCAD through a CAD format file secondary development method, identifies different types of linear, and extracts control parameters and route linear data of the CAD format file according to the window input key point. The scheme obtains the edge line of the curved panel model according to the curved panel refined baseline data and the curved panel defined parameters on the TeklaStructure software platform, generates the curved panel boundary space curve simulated by the multi-panel and the steel box girder bridge space curved panel BIM model according to the key points of the edge line, and the forward parameterization modeling process of the steel box girder bridge curved panel is simple and efficient.

Description

TECHNICAL FIELD

[0001] The scheme belongs to the technical field of bridge design modeling, and particularly relates to a rapid modeling system and method for a three-dimensional curved surface plate of a steel box girder bridge based on BIM. BACKGROUND

[0002] At present, under the trend of building informatization, the application of BIM technology in various fields of the construction industry is becoming mature. However, due to the different work focuses and structural complexities of various professions, the application maturity of BIM technology is unevenly developed among various professions. For example, the application of BIM technology in the pipe network profession with relatively simple structure is relatively mature, and the application maturity of BIM technology in the bridge and tunnel profession with relatively complex structure is relatively low. In addition, the BIM application in different stages of the life cycle of a project involves multiple software platforms. Data loss or repeated data input modeling on different software platforms may occur through data transmission of BIM models among different software platforms.

[0003] The patent with the application number CN111475885A discloses a curved steel box girder parameterized modeling method and device. In response to a user input instruction, a standard information selection interface is displayed to the user, wherein the standard information selection interface contains at least one bridge layer selection list. Based on the user's selection of at least one bridge layer contained in the standard information selection interface, at least one bridge layer is displayed to the user, wherein the bridge layer at least contains a partition plate layer, a top plate layer, a web plate layer, a bottom plate layer, a stiffening rib layer, a manhole layer, a welding layer, and a vertical curve layer. In response to the user's instruction for editing at least one bridge layer, a parameter collection interface is displayed to the user. Based on the user's parameter input to the parameter collection interface, the bridge layer information is configured in response.

[0004] The scheme makes the material quantity statistics and management standardized and automated through a three-dimensional BIM model, quickly adapts to changes, accurately outputs the shapes of special-shaped plates and positions, and improves the construction precision. However, due to the complexity of the steel box girder bridge structure, the high requirements for model precision and drawing rate, the BIM technology is relatively backward in the forward design and detailed drawing design of the steel box girder bridge structure. The Tekla Structure software platform has a powerful drawing processing system and an engineering quantity statistics system, can reasonably extract data through a BIM model, and efficiently and high-quality generate engineering drawings and engineering quantity tables, and is an ideal platform for solving the low drawing rate problem in the application of BIM technology. However, currently, the modeling of a complex steel box girder bridge on the Tekla Structure software platform may have the problem of a complex forward parameterized modeling process of the curved surface plate of the steel box girder bridge. SUMMARY

[0005] The scheme provides a kind of fast modeling system of three-dimensional curved panel of steel box girder bridge based on BIM, to solve the problem that complex steel box girder bridge modeling on TeklaStructure software platform will have the complex process of steel box girder bridge curved panel forward parameterization modeling.

[0006] In order to achieve the above purpose, the scheme provides a kind of fast modeling system of three-dimensional curved panel of steel box girder bridge based on BIM, including TeklaStructure software, the TeklaStructure software is developed with independent window application program, the TeklaStructure software includes parameter input module, parameter conversion module and model generation module,

[0007] Parameter input module, key point extraction control parameters are input through the window of TeklaStructure software, CAD format route linear data are selected through the button of window, AutoCAD is automatically opened through the method of CAD format file secondary development, different kinds of linear are identified, project database of target space linear key points is obtained according to key point extraction control parameters and CAD format route linear data input through window;

[0008] Parameter conversion module, according to the project database collected by parameter input module, the detailed baseline data generated by steel box girder curved panel is obtained by selecting spatial baseline data in CAD format file and basic structure data of steel box girder;

[0009] Model generation module, according to the edge line of curved panel model, the boundary space curve of multi-panel simulation and steel box girder bridge space curved panel BIM model are generated according to the key points of edge line.

[0010] The principle of the scheme is as follows: firstly, in the TeklaStructure software platform, parameter input module inputs key point extraction control parameters through window, CAD format route linear data are selected through window button, parameter conversion module selects spatial baseline data in CAD format file and basic structure data of steel box girder according to the project database collected by parameter input module, to obtain detailed baseline data generated by steel box girder curved panel; Model generation module obtains the edge line of curved panel model according to curved panel detailed baseline data and curved panel definition parameters, and generates the boundary space curve of multi-panel simulation and steel box girder bridge space curved panel BIM model according to the key points of edge line.

[0011] The beneficial effects of the scheme are as follows:

[0012] (1) This system automatically opens AutoCAD through the secondary development method of CAD format files, solving the problem of being unable to quickly input road line data from CAD into TeklaStructure software.

[0013] (2) On the TeklaStructure software platform, the edge of the curved panel model is obtained according to the refined baseline data and the curved panel definition parameters. The curved panel boundary space curve simulated by multiple panels and the steel box girder bridge space curved panel BIM model are generated according to the key points of the edge. The forward parametric modeling process of the steel box girder bridge curved panel is simple and efficient.

[0014] (3) The TeklaStructure software platform uses digital-model separation technology to intelligently generate the BIM model of the steel box girder bridge, which has the function of diversifying structural types and supports the generation of orthogonal and oblique, equal height and variable height, small variable width and large variable width, as well as cross-section types such as straight web, oblique web, flat steel box girder and π beam.

[0015] Furthermore, the parameter conversion module obtains the bottom plate centerline data from the centerline data and the structural beam height, obtains the bottom plate edge line data from the bottom plate centerline data and the bottom plate transverse slope data and the web inclination, and obtains the middle web baseline data from the route edge line space data and the middle web setting data.

[0016] Furthermore, the route linear data in the CAD format includes a plane center line, a plane left line, a plane right line, a route longitudinal section line and a beam bottom elevation line. The route linear data in the CAD format is a continuous polyline, which is located in different layers.

[0017] Furthermore, it also includes a key point calculation module, which obtains the data of the polyline of the plane centerline through the layer, obtains the plane coordinates on the plane centerline according to the key point mileage pile number data input by the WAF, draws a straight line through the point and the angle control parameter, and obtains the plane coordinates of the key point of the edge line at the intersection of the straight line and the edge line; obtains the Z coordinate and beam height of the key point through the mileage pile number control parameter and the longitudinal section line of the route, and synthesizes the key point plane coordinate and Z coordinate into the spatial coordinates of the key point of the road centerline.

[0018] Furthermore, the project database includes key point coordinates of the center line and the side line and beam height data, the key point coordinates of the side line are the Z coordinates of the side line key points, and the key point calculation module calculates the Z coordinates of the side line key points according to the spatial coordinates of the center line key points, the cross slope parameters and the side line plane coordinates;

[0019] Dl=√((X0-X1)*(X0-X1)+(Y0-Y1)*(Y0-Y1)); Formula (1)

[0020] Dz = Dl * sin a, Dh = Dl * cos a; Equation (2)

[0021] Z1 = Z0 + Dz * i0 + Dh * i1; Equation (3)

[0022] Wherein, the road center line key point space coordinates (X0, Y0, Z0), the edge line key point plane coordinates (X1, Y1), the edge line key point Z coordinates (Z1), the corresponding transverse slope i1, the corresponding longitudinal slope i0, the oblique angle a, the oblique line distance Dl, the longitudinal distance Dz, the transverse distance Dh.

[0023] Further, the road center line includes straight line, circular curve and transition curve, wherein the transition curve is fitted by the circular curve;The key point calculation module obtains the plane coordinates on the plane center line according to the milepost data, wherein the two-dimensional coordinates p1 (X1, Y1) of the starting point of the circular curve, the two-dimensional coordinates p2 (X2, Y2) of the terminal point, the convexity ql of the circular curve, the milepost number L0 of the starting point, the milepost number Li of the key point, the road center line key point coordinates pi are obtained as follows:

[0024] Arc chord length d = (distance p1 p2);Equation (4)

[0025] Radius r = abs ((*0.25d (1+ql2) / ql 2 ));Equation (5)

[0026] Polar center p0 = (polar(list( / (+X1 X2)2)( / (+Y1 Y2)2))(+(angle p1p2)(*0.5π))( / (*0.25(distance p1 p2)(-1(*ql ql)))ql)));Equation (6)

[0027] Polar angle of the center of the circle to the starting point of the arc: a1 = (angle p0 p1);Equation (7)

[0028] Polar angle of the center of the circle to the key point of the arc: ai = a1 + (Li-L0) / r;Equation (8)

[0029] Pi = (polar p0 ai r);Equation (9)

[0030] Wherein, distance is the distance function in CAD;Abs is the absolute value function;Equation (6) is the key formula of lisp language, polar is the point function of polar coordinates, angle is the angle function of two points.

[0031] Further, the key point calculation module obtains the corresponding edge line key point according to the road center line key point and the input skew angle; an intersection point coordinate is obtained by making an auxiliary straight line intersecting with the edge line through the road center line key point and the input corresponding skew angle, the auxiliary straight line m1-m2, the two-dimensional coordinates of the starting point of the circular curve p1(X1, Y1), the two-dimensional coordinates of the terminal point p2(X2, Y2), the circular center point p0, the radius r of the circular arc, and the foot p3 of the perpendicular line from the circular center to the auxiliary line m1-m2; the Lisp key code is as follows:

[0032] (setq p3 (polar p0 (+ (angle m1 m2) (* 0.5 pi)) 100)); formula (10)

[0033] (setq p3 (inters m1 m2 p0 p3 nil)); formula (11)

[0034] pi = (polar p3 (angle m1 m2) dd). Formula (13)

[0035] Further, the model generation module is simulated according to the key point selection of the three-dimensional boundary line, the key points (1pi and 1pi+1) on the boundary 1, the key points (2pi and 2pi+1) on the boundary 2, when the four points 1pi, 1pi+1, 2pi and 2pi+1 are coplanar, a quadrilateral plate is used for simulation, if the four points are not coplanar, two triangles are used for simulation, and the loop ends.

[0036] Further, a rapid modeling method of a three-dimensional curved plate of a steel box girder bridge based on BIM is disclosed, comprising the following steps:

[0037] S10; the Tekla Structure software determines whether the route boundary space curve data is updated according to the BIM technology mixed application platform, if the data is updated, a CAD format file is selected and then the route boundary space curve data is obtained; if the route boundary space curve data is not updated, the route boundary space curve data is directly obtained;

[0038] S20; the parameter input module inputs the basic parameters and detailed control data of the steel box girder bridge curved plate structure through a window;

[0039] S40;Parameter conversion module obtains the boundary space curve data of the curved panel of the steel box girder bridge according to the detailed control data of the curved panel structure of the steel box girder bridge and the space baseline data of the curved panel of the steel box girder bridge;

[0040] S50;The model generation module generates the BIM model of the curved panel of the steel box girder bridge according to the boundary space curve data of the curved panel of the steel box girder bridge. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 It is the method flow schematic diagram of the embodiment of the application.

[0042] Figure 2 It is the edge line Z coordinate structure schematic diagram of the embodiment of the application.

[0043] Figure 3 It is the road center line key point two-dimensional coordinate structure schematic diagram of the embodiment of the application.

[0044] Figure 4 It is the corresponding edge line key point two-dimensional coordinate structure schematic diagram of the embodiment of the application.

[0045] Figure 5 It is the curved panel structure simulation key point structure schematic diagram of the embodiment of the application.

[0046] Figure 6 It is the curved panel structure simulation structure schematic diagram of the embodiment of the application.

[0047] Figure 7 It is the skew steel box girder structure model plane view of the embodiment of the application.

[0048] Figure 8 It is the orthogonal steel box girder structure model plane view of the embodiment of the application.

[0049] Figure 9 It is the variable height steel box girder structure model three-dimensional view of the embodiment of the application.

[0050] Figure 10 It is the equal height steel box girder structure model three-dimensional view of the embodiment of the application.

[0051] Figure 11 It is the large width change variable box chamber steel box girder structure model three-dimensional view of the embodiment of the application.

[0052] Figure 12 It is the small width change equal box chamber steel box girder structure model three-dimensional view of the embodiment of the application.

[0053] Figure 13 It is the straight web plate structure schematic diagram of the embodiment of the application.

[0054] Figure 14 It is the inclined web plate structure schematic diagram of the embodiment of the application.

[0055] Figure 15 This is a schematic diagram of the flat steel box girder structure according to an embodiment of the present invention.

[0056] Figure 16 Schematic diagram of the π beam structure according to an embodiment of the present invention. DETAILED DESCRIPTION

[0057] The following is further described in detail through specific implementation methods:

[0058] The embodiment is basically as shown in the attached Figure 1 As shown:

[0059] A BIM-based rapid modeling system for three-dimensional curved panels of steel box girder bridges, including TeklaStructure software, which includes a parameter input module, a parameter conversion module, and a model generation module.

[0060] The parameter input module extracts control parameters by inputting key points through the form, selects route line type data in CAD format files through form buttons, automatically opens AutoCAD through CAD secondary development methods, identifies different types of line types, extracts control parameters and route line type data in CAD format based on the key points input through the form, and obtains the project database of target space line type key points; the route line type data in CAD format includes the plane center line, the plane left line, the plane right line, the route longitudinal section line and the beam bottom elevation line. The route line type data in CAD format is a continuous polyline, which is located in different layers.

[0061] The parameter conversion module selects the spatial baseline data and the basic structural data of the steel box girder in the CAD format file according to the project database collected by the parameter input module to obtain the refined baseline data generated by the curved panel of the steel box girder; for example, the parameter conversion module obtains the bottom plate centerline data from the centerline data and the structural beam height, obtains the bottom plate edge line data from the bottom plate centerline data and the cross slope data of the bottom plate and the web inclination, and obtains the middle web baseline data from the route edge space data and the setting data of the middle web.

[0062] As attached Figures 7-16 As shown:

[0063] The TeklaStructure software platform uses digital-model separation technology to intelligently generate the BIM model of steel box girder bridges. It has the function of diversifying structural types and supports the generation of orthogonal and skew, equal height and variable height, small variable width and large variable width, as well as cross-section types such as straight web, inclined web, flat steel box girder and π beam.

[0064] As attached Figures 2-4 As shown:

[0065] The key point calculation module obtains the data of the multi-segment line of the plane center line through the layer, obtains the plane coordinates on the plane center line according to the key point milepost data input by the WAF, makes a straight line through the point and the angle control parameter, and obtains the edge line key point plane coordinates through the intersection of the straight line and the edge line; the key point Z coordinates and the beam height are obtained through the milepost control parameter and the route longitudinal line, and the key point plane coordinates and the Z coordinates are combined to synthesize the road center line key point space coordinates.

[0066] The project database comprises the key point coordinates and the beam height data of the center line and the edge line, the key point coordinates of the edge line are the edge line key point Z coordinates, and the key point calculation module calculates the edge line key point Z coordinates according to the center line key point space coordinates, the transverse slope parameter and the edge line plane coordinates;

[0067] Dl = sqrt((X0-X1)*(X0-X1)+(Y0-Y1)*(Y0-Y1)); Formula (1)

[0068] Dz = Dl*sinα, Dh = Dl*cosα; Formula (2)

[0069] Z1 = Z0+Dz*i0+Dh*i1; Formula (3)

[0070] The road center line key point space coordinates (X0, Y0, Z0), the edge line key point plane coordinates (X1, Y1), the edge line key point Z coordinates (Z1), the corresponding transverse slope i1, the corresponding longitudinal slope i0, the oblique angle α, the oblique line distance Dl, the longitudinal distance Dz and the transverse distance Dh.

[0071] The road center line comprises a straight line, a circular curve and a transition curve, wherein the transition curve is fitted by the circular curve; the key point calculation module obtains the plane coordinates on the plane center line according to the milepost data, wherein the two-dimensional coordinates p1 (X1, Y1) of the starting point of the circular curve, the two-dimensional coordinates p2 (X2, Y2) of the terminal point, the convexity ql of the circular curve, the milepost L0 of the starting point and the key point milepost Li are obtained, and the road center line key point coordinates pi are:

[0072] Arc chord d = (distance p1 p2); Formula (4)

[0073] Radius r = abs((*0.25d(1+ql2) / ql 2 )); Formula (5)

[0074] Center of circle p0 = (polar(list( / (+X1 X2)2)( / (+Y1 Y2)2))(+(angle p1 p2)(*0.5π))( / (*0.25(distance p1 p2)(-1(*ql ql)))ql)))ql))) ; Equation (6)

[0075] Polar coordinate angle from the center of circle to the start point of the circular arc: a1 = (angle p0 p1) ; Equation (7)

[0076] Polar coordinate angle from the center of circle to the key point of the circular arc: ai = a1 + (Li-L0) / r ; Equation (8)

[0077] pi = (polar p0 ai r) ; Equation (9)

[0078] Where, distance is the distance function in CAD; abs is the absolute value function; Equation (6) is the key formula of lisp language, polar is the point function of polar coordinate, and angle is the angle function of two points.

[0079] The key point calculation module obtains the corresponding edge line key point according to the road center line key point and the input skew angle; an auxiliary straight line is drawn through the road center line key point and the input corresponding skew angle to intersect with the edge line to obtain the intersection point coordinates, the auxiliary straight line m1-m2, the start point two-dimensional coordinates p1 (X1, Y1) of the circular curve, the end point two-dimensional coordinates p2 (X2, Y2) of the circular curve, the circular arc center point p0, and the circular arc radius r,

[0080] The perpendicular foot p3 of the center of circle to the auxiliary line m1-m2 is as follows:

[0081] (setq p3 (polar p0 (+(angle m1 m2)(*0.5π))100)) ; Equation (10) (setq p3 (inters m1 m2 p0 p3 nil)) ; Equation (11) The length dd of the line segment p3-pi is √(r2-(distance p0 p3)) ; Equation (12) The corresponding key point of the edge line is:

[0082] pi = (polar p3 (angle m1 m2) dd). Equation (13)

[0083] As shown in the accompanying drawings: Figures 5-6

[0084] ​The model generation module simulates according to the key point selection of the three-dimensional boundary line, the key points on the boundary 1 (1pi and 1pi+1), the key points on the boundary 2 (2pi and 2pi+1), when the four points 1pi, 1pi+1, 2pi and 2pi+1 are coplanar, a quadrilateral plate is used for simulation, if the four points are not coplanar, two triangles are used for simulation, the loop ends, the curved surface plate is simulated according to the density of the key points of the boundary, then the edge line of the curved surface plate model is obtained according to the refined baseline data and the curved surface plate definition parameters of the curved surface plate, and the curved surface plate boundary space curve and the steel box girder bridge space curved surface plate BIM model simulated by the curved surface plate are generated according to the key points of the edge line. The designer can flexibly obtain the quantity boundary line of the curved surface plate by the method of XY plane offset and Z curved surface offset refining the space baseline, and then generate various complex steel box girder structure models. The same curved surface plate is provided with the same component name, which is convenient for later selection and reading.

[0085] As shown in the accompanying drawings: Figure 1

[0086] A BIM-based rapid modeling method of a three-dimensional curved surface plate of a steel box girder bridge is also disclosed, comprising the following steps:

[0087] S10; the Tekla Structure software judges whether the route boundary space curve data is updated according to the BIM technology mixed application platform, if the data is updated, the CAD boundary file is selected and then the route boundary space curve data is obtained; if the route boundary space curve data is not updated, the route boundary space curve data is directly obtained;

[0088] S20; the parameter input module inputs the steel box girder bridge curved surface plate structure basic parameters and the steel box girder bridge curved surface plate structure detailed control data through a window;

[0089] S30; the parameter conversion module obtains the steel box girder bridge curved surface plate space baseline data according to the steel box girder bridge curved surface plate structure basic parameters and the route boundary space curve;

[0090] S40; the parameter conversion module obtains the steel box girder bridge curved surface plate boundary space curve data according to the steel box girder bridge curved surface plate structure detailed control data and the steel box girder bridge curved surface plate space baseline data;

[0091] S50; the model generation module generates the steel box girder bridge curved surface plate BIM model according to the steel box girder bridge curved surface plate boundary space curve data.

[0092] ​The above-mentioned are only embodiments of the present application, and the common knowledge of specific structures and characteristics in the scheme is not described too much. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, which will not affect the effect and practicality of the patent. The protection scope claimed in this application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A rapid modeling system for three-dimensional curved surface plates of a steel box girder bridge based on BIM, characterized in that: The application relates to a key point extraction method for a steel box girder bridge, which comprises Tekla Structure software, a parameter input module, a parameter conversion module and a model generation module, The parameter input module inputs key point extraction control parameters through a Tekla Structure software window, selects CAD format route linear data through a window button, automatically opens AutoCAD through a CAD secondary development method, identifies different kinds of linear, obtains a project database of target space linear key points according to the key point extraction control parameters and the CAD format route linear data input through the window, and the parameter conversion module selects space baseline data in a CAD format file and basic structure data of the steel box girder to obtain refined baseline data generated by the steel box girder curved plate. The model generation module obtains the edge line of the curved plate model according to the curved plate refined baseline data and the curved plate definition parameters, generates the curved plate boundary space curve simulated by the multi-plate and the steel box girder bridge space curved plate BIM model according to the key points of the edge line. The parameter conversion module obtains the bottom plate center line data from the center line data and the structure beam height, obtains the bottom plate edge line data from the bottom plate center line data, the transverse slope data of the bottom plate and the web slope, and obtains the web baseline data from the route edge line space data and the setting data of the web.

2. The rapid modeling system for BIM-based three-dimensional curved surface plates of steel box girder bridges according to claim 1, characterized in that: The CAD format route linear data comprises a plane center line, a plane left edge line, a plane right edge line, a route vertical section line and a beam bottom elevation line, and the CAD format route linear data is a continuous multi-segment line and is located in different layers.

3. The rapid modeling system for BIM-based three-dimensional curved surface plates of steel box girder bridges according to claim 2, characterized in that: The key point calculation module obtains the data of the multi-segment line of the plane center line through the layers, obtains the plane coordinates on the plane center line according to the key point mileage stake number data input by the WAF, makes a straight line through the point and the angle control parameter, obtains the edge line key point plane coordinates through the intersection of the straight line and the edge line, and obtains the key point Z coordinates and the beam height through the mileage stake number control parameter and the route vertical section line.

4. The rapid modeling system for BIM-based three-dimensional curved surface plates of steel box girder bridges according to claim 3, characterized in that: The project database comprises the key point coordinates of the center line and the edge line and the beam height data, the key point coordinates of the edge line are the Z coordinates of the edge line key points, and the key point calculation module calculates the Z coordinates of the edge line key points according to the center line key point space coordinates, the transverse slope parameter and the edge line plane coordinates.

5. The rapid modeling system for BIM-based three-dimensional curved surface plates of steel box girder bridges according to claim 4, characterized in that: Dl = sqrt((X0-X1)*(X0-X1)+(Y0-Y1)*(Y0-Y1)); Formula (1) Dz = Dl*sin alpha, Dh = Dl*cos alpha; Formula (2) Z1 = Z0+Dz*i0+Dh*i1; Formula (3) wherein the road center line key point space coordinates (X0, Y0, Z0), the edge line key point plane coordinates (X1, Y1), the edge line key point Z coordinates (Z1), the corresponding transverse slope i1, the corresponding vertical slope i0, the oblique angle alpha, the oblique line distance Dl, the vertical distance Dz and the horizontal distance Dh. ​ 6. The rapid modeling system for BIM-based three-dimensional curved surface plates of steel box girder bridges according to claim 5, characterized in that: The road center line comprises straight lines, circular curves and clothoids, wherein the clothoids are fitted by the circular curves; the key point calculation module obtains the planar coordinates on the planar center line according to the milepost data, wherein the two-dimensional coordinates of the start point of the circular curve are p1 (X1, Y1), the two-dimensional coordinates of the end point are p2 (X2, Y2), the convexity of the circular curve is ql, the milepost number of the start point is L0, the milepost number of the key point is Li, and the key point coordinates pi of the road center line are obtained as follows: Arc chord length d = (distance p1 p2); formula (4) Radius r = abs((*0.25d(1 + ql2) / ql 2 )); Equation (5) The center of the circle p0 = (polar (list ( / (+X1 X2) 2) ( / (+Y1 Y2) 2)) (+ (angle p1 p2) (* 0.5 π)) ( / (* 0.25 (distance p1 p2) (-1 (* ql ql))) ql)) ql)); formula (6) The polar coordinate angle of the center of the circle to the start point of the arc: α1 = (angle p0 p1); formula (7) The polar coordinate angle of the center of the circle to the key point of the arc: αi = α1 + (Li-L0) / r; formula (8) pi = (polar p0 αir); formula (9) Wherein, distance is the distance function in CAD; abs is the absolute value function; formula (6) is the key formula of lisp language, polar is the point function of polar coordinates, and angle is the angle function of two points.

7. The rapid modeling system for BIM-based three-dimensional curved surface plates of steel box girder bridges according to claim 6, characterized in that: The key point calculation module obtains the corresponding edge line key points according to the road center line key points and the input skew angle; an auxiliary straight line is drawn through the road center line key points and the input corresponding skew angle to intersect with the edge line to obtain the intersection coordinates, the auxiliary straight line m1-m2, the two-dimensional coordinates of the start point of the circular curve p1 (X1, Y1), the two-dimensional coordinates of the end point p2 (X2, Y2), the center point of the arc p0, and the radius r of the arc, The foot p3 of the perpendicular from the center of the circle to the auxiliary line m1-m2 is as follows: (setq p3 (polar p-o (+ (angle m1 m2) (* 0.5 π)) 100)); formula (10) (setq p3 (inters m1 m2 p-o p3 nil)); formula (11) The length of the line segment p3-pi is dd = √(r2-(distance p0 p3)); formula (12) The corresponding key point of the edge line is: pi = (polar p3 (angle m1 m2) dd); formula (13).

8. The rapid modeling system of three-dimensional curved surface plates of a BIM-based steel box girder bridge according to claim 7, characterized in that: The model generation module simulates according to the key points of the three-dimensional boundary line, the key points (1pi and 1pi+1) on the boundary 1, the key points (2pi and 2pi+1) on the boundary 2, when the four points 1pi, 1pi+1, 2pi and 2pi+1 are coplanar, a quadrilateral plate is used for simulation, if the four points are not coplanar, two triangles are used for simulation, and the loop ends. The surface plate is simulated according to the density of the boundary key points.

9. A method for rapid modeling of a three-dimensional curved surface plate of a steel box girder bridge based on BIM is also disclosed, which adopts the system according to any one of claims 1-8, characterized in that: Comprise the following steps: S10; the Tekla Structure software determines whether the route boundary space curve data is updated according to the BIM technology mixed application platform, if the data is updated, the CAD boundary file is selected and then the route boundary space curve data is obtained; if the route boundary space curve data is not updated, the route boundary space curve data is directly obtained; S20; the parameter input module inputs the basic parameters and detailed control data of the steel box girder bridge curved panel structure through a window; S30； The parameter conversion module obtains the steel box girder bridge curved panel space baseline data according to the basic parameters of the steel box girder bridge curved panel structure and the route boundary space curve; S40; the parameter conversion module obtains the steel box girder bridge curved panel boundary space curve data according to the detailed control data of the steel box girder bridge curved panel structure and the steel box girder bridge curved panel space baseline data; S50; the model generation module generates the steel box girder bridge curved panel BIM model according to the steel box girder bridge curved panel boundary space curve data.

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