Design method of twisted face glass curtain wall

Abstract

The application discloses a design method of a twisted surface glass curtain wall and relates to the technical field of building curtain walls, which comprises the following steps: extracting the original contour free curve of an original building twisted surface model, establishing a new surface after optimization, and dividing the new surface into a plurality of unit curved surfaces according to building grid limiting conditions; taking the glass warping value and the curved surface arch height as constraint conditions, respectively, setting critical values for screening and judgment, and obtaining hyperboloid blocks, single curved surface blocks and plane blocks; for the hyperboloid blocks, continuous analysis and optimization are carried out, the hyperboloid blocks are optimized into single curved surface blocks, and curtain wall system structure design is carried out. The application adopts digital technology to simulate and optimize the segmented twisted surface under the building limiting conditions, replaces the twisted surface with plane blocks and single curved surface blocks as much as possible, and then carries out targeted curtain wall system structure design, so that the cost and implementation difficulty of the twisted surface glass curtain wall are greatly reduced, the twisted surface appearance effect is realized to the greatest extent at a lower cost, the method has strong operability and high practical value.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of building curtain wall, more particularly, to a design method of twisted surface glass curtain wall. BACKGROUND

[0002] With the development of digital technology, curved surface forms are widely used in architectural design. Complex spatial twisted surface glass curtain walls are favored by architects due to their lightness, softness and smoothness. However, as a brittle material, it is relatively difficult to realize a twisted surface glass curtain wall compared to a flat surface or a single curved surface glass curtain wall. The most ideal method to realize a twisted surface is to use glass bending method to bend the glass into a twisted surface shape, and to bend the supporting keel into a reasonable arc. The main advantage of this method is to ensure that adjacent curtain wall panels can be naturally transitioned, enhancing the smoothness and aesthetics of the overall appearance of the curved surface. However, this method has the disadvantage of a complex glass processing process, requiring the customization of a large number of hot bending molds, and the quality of the two-way bending of the keel is difficult to control, resulting in a long processing period, high processing cost, and great difficulty in processing. Therefore, in actual engineering, cold bending technology or a triangular panel fitting twisted surface method is often used to realize the twisted surface effect of the glass curtain wall. The cold bending technology principle of the former is to use the elastic bending characteristics of flat glass itself. The glass is installed in place by artificial bending, and the effect of fitting the curved surface of the curtain wall is achieved by the bending and deformation of multiple flat glass. The glass curtain wall installed using the cold bending technology has internal stress between the glass and the profile, which cannot be eliminated and will exist for a long time. During construction and installation and later use, glass breakage may occur. Therefore, this method is only suitable for twisted surface glass curtain walls with small curvature. The triangular panel fitting twisted surface method divides the twisted surface glass into several triangular flat panel glasses, and realizes the general continuous smooth spatial twisted surface through the coplanar three points of the triangular panel. For complex spatial twisted surfaces, triangular flat panel modeling can be achieved. However, the triangular flat panel simulation curved surface method results in poor visual effect of the glass curtain wall, and too many triangular panels destroy the visual transparency, and the triangular joints are visually messy. In actual completed projects, the twisted surface glass curtain wall is expensive but has poor visual effect, and it is difficult to meet the quality requirements of architects for the appearance of the twisted surface. Therefore, it is necessary to propose a design method of twisted surface glass curtain wall to solve the above engineering problems from the design source. SUMMARY

[0003] In view of the above defects or improvement needs of the prior art, the present application proposes a design method of a twisted surface glass curtain wall, which uses digital technology to simulate and optimize the segmented twisted surface under the building restriction condition, uses flat and single curved plates to replace the twisted surface as much as possible, and then carries out targeted curtain wall system construction design, so as to greatly reduce the cost and difficulty of the twisted surface glass curtain wall, realize the twisted surface appearance effect to the greatest extent at a lower cost, has strong operability, and has high practical value.

[0004] To achieve the above object, the present application provides a design method of a twisted surface glass curtain wall, comprising:

[0005] S1: inputting a three-dimensional model of an original building twisted surface;

[0006] S2: extracting an original contour free curve of the three-dimensional model, establishing a new surface after optimizing the original contour free curve, and dividing the new surface into a plurality of glass unit surfaces according to the building division restriction condition;

[0007] S3: analyzing the glass unit surfaces, respectively setting a critical value x and a critical value y to screen and determine the glass unit surfaces as constraint conditions of a glass warping value and a surface arch height, and respectively obtaining a double curved surface block, a single curved surface block and a flat surface block;

[0008] S4: continuously analyzing and optimizing the obtained double curved surface block to optimize the double curved surface block into a single curved surface block;

[0009] S5: carrying out curtain wall system construction design.

[0010] In some optional embodiments, step S3 comprises:

[0011] S31: picking up four vertices of the glass unit surface, forming a plane with three of the four vertices, calculating a distance value of the fourth vertex to the plane as a glass warping value X0 of the glass unit surface, and setting a critical value x; calculating a distance value of an area center of the glass unit surface to the glass unit surface as an arch height Y0 of the glass unit surface, and setting a critical value y;

[0012] S32: when X0>x, the glass unit surface is a double curved surface, and the arch height Y0 does not need to be determined, and directly enters step S4 for further optimization;

[0013] S33: when X0≤x, the glass unit surface can be replaced by a flat surface or a single curved surface, and the arch height Y0 needs to be determined;

[0014] S34: when Y0≤y, the glass unit surface is replaced by a flat surface; and when Y0>y, the glass unit surface is replaced by a single curved surface.

[0015] In some optional embodiments, step S4 comprises:

[0016] The two diagonal lines are connected to obtain four vertexes of the glass unit curved surface, a midpoint of a shorter diagonal line L1 of the two diagonal lines and two end points of another diagonal line L2 are used to form a circular arc line, the circular arc line is used to form a curved surface in the direction of the diagonal line L1, and the original hyperboloid contour line is projected onto the curved surface to obtain the single curved surface after optimization.

[0017] Overall, compared with the prior art, the above technical solutions conceived by the present application can achieve the following beneficial effects:

[0018] The design method of the twisted surface glass curtain wall provided by the present application can simulate and optimize the segmentation of the twisted surface through software and digital technology under the building restriction condition, can preferably use flat plates and single curved plates to replace the twisted surface, and then can perform targeted curtain wall system structure design, so that the cost of the twisted surface glass curtain wall is greatly reduced, the implementation difficulty of the twisted surface glass curtain wall is reduced, the appearance effect of the twisted surface is realized to the greatest extent at a lower cost, the method has strong operability, and has high practical value. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a method flowchart provided by an embodiment of the present application;

[0020] Figure 2 is a twisted surface glass curtain wall schematic diagram provided by an embodiment of the present application;

[0021] Figure 3 is a Gaussian curvature analysis diagram of a twisted surface before optimization provided by an embodiment of the present application;

[0022] Figure 4 is a data analysis diagram of a genetic algorithm provided by an embodiment of the present application;

[0023] Figure 5 is a glass unit division schematic diagram according to a building restriction condition provided by an embodiment of the present application;

[0024] Figure 6 is a single curved fitting hyperbolic schematic diagram provided by an embodiment of the present application;

[0025] Figure 7 is a Gaussian curvature analysis diagram of a twisted surface after optimization provided by an embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and not to limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0027] As Figure 1 shown is a method flowchart provided by an embodiment of the present application, Figure 2 and Figure 3 is a space twist surface glass curtain wall, the glass surface twist is irregular, the Gaussian curvature changes greatly, below the space twist surface is taken as an example to explain the specific method steps of the present application.

[0028] As Figures 1-7 shown, a design method of a twist surface glass curtain wall, comprising the following steps:

[0029] Step S1: input the three-dimensional model of the original building twist surface glass curtain wall in Rhino software;

[0030] Step S2: extract the original profile free curve a of the twist surface, randomly take 3 sampling points on the curve a and disconnect the curve a to form 4 curve segments a1, a2, a3, a4, respectively take the two endpoints and the midpoint of the 4 curve segments to form 4 new circular arc segments b1, b2, b3, b4, divide the new circular arc segments b(b1, b2, b3, b4) with 100 grid points respectively, then calculate the nearest distance value of all grid points to the curve segment a(a1, a2, a3, a4) and sum up sum;

[0031] As Figure 4 shown, the sum is minimum when the specific point position of the 3 sampling points in the above step is calculated by the genetic algorithm of Rhino software Grasshopper, the circular arc segment b(b1, b2, b3, b4) obtained when the sum is minimum is the closest to the original profile free curve a, and then the lofting is obtained to obtain the optimized curved surface P1;

[0032] As Figure 5 shown, according to the building grid limit condition, the optimized curved surface P1 is intersected according to the horizontal grid surface to extract the grid curve c on the curved surface P1, the grid curve c is divided into 4 equal parts and the data structure of the grid points is reversed, the grid points are connected to form the vertical grid to create the glass unit curved surface P2.

[0033] Step S3: analyze the glass unit curved surface P2, respectively take the glass warping value X0 and the curved surface arch height Y0 as the constraint condition, set the critical value x and the critical value y to screen and determine the glass unit curved surface P2, the specific steps are as follows:

[0034] AsFigure 6 As shown, pick up the four vertices of the unit surface P2 and use three of them to form a plane. The distance from the fourth point to the plane is calculated as the glass warpage value X0 of the unit surface P2, and the critical value x is set to 20mm; the distance from the area center of gravity of the unit surface P2 to the surface is the arch height Y0 of the unit surface P2, and the critical value y is set to 50mm;

[0035] When X0>x, the unit surface P2 is a hyperbolic surface, and there is no need to determine the arch height Y0, and directly enter step S4 for further optimization;

[0036] When X0≤x, the unit surface P2 can be replaced by a plane or a single curved surface fitting, and the arch height Y0 needs to be determined: when Y0≤y, the unit surface P2 is replaced by a plane fitting; when Y0>y, the unit surface P2 is replaced by a single curved surface fitting.

[0037] Step S4: Continue to analyze and optimize the hyperbolic panel block obtained in step S3. The specific steps are as follows:

[0038] like Figure 7 As shown, pick up the four vertex diagonals of the unit surface P2 and connect them to obtain two diagonals. Take the midpoint of the shorter diagonal L1 and the two end points of the other diagonal L2 to form an arc line d. The arc line d is then made into a surface in the direction of the diagonal L1. The original hyperbolic surface contour line is projected onto this surface to obtain the optimized single curved surface P3.

[0039] Step S5: Curtain wall system structure design is performed for the optimized flat glass and single curved glass respectively.

[0040] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, or two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0041] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A design method for a twisted glass curtain wall, characterized in that: include: S1: Input the 3D model of the original building’s distorted surface; S2: Extract the original free-form curve of the 3D model, optimize the original free-form curve to create a new surface, and divide the new surface into several glass unit surfaces according to the building grid constraints; S3: Analyze the glass unit surface, use the glass warpage value and the surface arch height as constraints, set the critical value x and the critical value y respectively to screen and determine the glass unit surface, and obtain the double-curved panel block, single-curved panel block and flat plate respectively; S4: Continue to analyze and optimize the obtained hyperbolic panel block, and optimize the hyperbolic panel block into a single-curved panel block; S5: Conduct curtain wall system structural design; Step S3 includes: S31: Pick up four vertices of the glass unit surface, use three of the vertices to form a plane, calculate the distance from the fourth vertex to the plane as the glass warp value X0 of the glass unit surface, and set a critical value x; the distance from the area center of gravity of the glass unit surface to the glass unit surface is used as the arch height Y0 of the glass unit surface, and set a critical value y; S32: When X0>x, the glass unit surface is a hyperbolic surface, and there is no need to determine the arch height Y0, and directly proceed to step S4 for further optimization; S33: When X0≤x, the glass unit surface can be replaced by a plane or a single curve fitting, and the arch height Y0 needs to be determined; S34: When Y0≤y, the glass unit surface is replaced by plane fitting; when Y0>y, the glass unit surface is replaced by single surface fitting; Step S4 includes: Pick up the four vertices of the glass unit surface and connect them to get two diagonal lines. Take the midpoint of the shorter diagonal line L1 and the two end points of the other diagonal line L2 to form an arc line. The arc line is then curved in the direction of the diagonal line L1. The original hyperbolic surface contour line is projected onto this surface to obtain the optimized single curved surface.

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