WO2017005189A1

WO2017005189A1 - Transition node for circular and square tubes and 3d modeling method thereof

Info

Publication number: WO2017005189A1
Application number: PCT/CN2016/088765
Authority: WO
Inventors: 刘欢; 刘军; 张�浩; 李金火; 凌伟
Original assignee: 中建钢构有限公司
Priority date: 2015-07-09
Filing date: 2016-07-06
Publication date: 2017-01-12
Also published as: CN105023293A

Abstract

Disclosed are a transition node for circular and square tubes and a 3D modeling method thereof. The method comprises: establishing a planar rectangular coordinate system, drawing an inner circle and an outer circle with centers thereof at the origin and the two circles forming a circular ring, drawing a square interface in the coordinate system, drawing a reference regular octagon in the bottom circle, and placing four vertices of the regular octagon on the coordinate axes, connecting a point where the inner circle intersects the axis of the rectangular coordinate system to a vertex of the inner square to form a connecting line; moving out the bottom circle and the connecting line, and drawing an inclined cylinder in the same coordinate system with the circular ring at the bottom as a cross-section thereof and the connecting line as a generatrix; using the cross-section as a cutting plane of the cylinder to obtain a curved surface having a bottom edge of one-eighth of the circle; moving the curved surface to the equivalent position on the bottom circle, and obtaining another curved surface using the same method to form one planar isosceles triangular plate and two inclined curved plates, and finally forming a transition node for circular and square tubes. The structure produced by the method is uniformly stressed and has a reliable force transfer, good connection bearing, and reduced stress concentration.

Description

Circular square tube transition node and three-dimensional modeling method thereof

Technical field

The invention belongs to the technical field of steel structures, in particular to a circular square tube transition node and a three-dimensional modeling method thereof for connecting a steel-concrete mixed structure circular tube and a square tube member.

Background technique

With the development of the national economy, more and more large stadiums, leisure shopping plazas, convention centers, aviation airports, high-speed rail stations, super high-rises and other large spaces and large space buildings need to be built. This type of building is generally a large-span space steel structure, which usually has the characteristics of large span, unique shape and complex structure, and often becomes an iconic building in an area. In order to meet the architectural requirements, and in order to achieve better social and economic benefits, a variety of connection node forms are also widely used in various construction fields.

The node is the core of the steel structure. The shape of the large cantilever space structure is increasingly complex and diverse, and the application of the hybrid structure causes the node form to become more diverse and complicated. On the basis of the initial plate node and the ball node, the intersecting nodes, the cast steel nodes and some mixed nodes where the pipe and the pipe directly meet are developed. The intersection of a round pipe and a round pipe is generally a coherent node or a ball node, and has been applied in other domestic projects. For the sake of aesthetics and other aspects, the square tube has been applied to the large cantilever space structure in the structural design, and the connection form of the square tube and the round tube has no mature norms and techniques for reference in China.

Following the principle of “strong nodes and weak components” in structural design, the node design of spatial grid structure is an important guarantee for the safe and reliable structure design. Only through a reliable connection node can the structural engineer's design intent be achieved and a sufficiently secure structure can be obtained. How to make a reasonable connection of many connecting nodes to ensure the reasonable structural force, convenient processing, convenient on-site installation, fast construction, and reduced workload on-site welding have become an urgent need for improvement.

A circular square tube transition node disclosed in the prior art, the transition node is composed of four transition surfaces, and two intersecting inflection points are formed on the transition surface, and the boundary line forms two right angles with the side weld line and the upper weld line. In the shape of a triangle, the triangular face in the transition surface is a curved surface. Although this method has a certain effect on improving the force transmission, in practical applications, the size of the blanking, especially the size of the arc panel, is difficult to determine, the rolling is difficult, and the applicable size is small, when the component size is large or the component is thick Can not meet the stress and rolling requirements of the transition joint.

technical problem

The technical problem to be solved by the present invention is to provide a three-dimensional modeling method for a circular square tube transition node. The circular square tube transition node formed by the method has the advantages of uniform force, stable and reliable bearing, and wide application range. And can meet the dimensional change requirements of the architectural design to determine the rolling process, while reducing the stress concentration and cracking caused by rolling.

Technical solution

The present invention is realized in the form of a circular square tube transition node, comprising four composite plates of the same structure, each of which comprises a planar isosceles triangular plate and two curved curved plates. The triangular plate is located at an intermediate position of the combined plate, and the two oblique curved panels are respectively located at two sides of the triangular plate; the curved curved plate is rolled by a bus bar of a inclined column with a round bottom surface. Made of.

Further, the triangular plate includes a first bottom edge and two first side edges, the two first side edges respectively intersecting with the first bottom edge, and the two first side edges intersect, The first bottom edge and the first side edge are both planar structures.

Further, the curved curved panel includes a second bottom edge, a second side edge, and a third side edge, wherein the second side edge and the third side edge are respectively intersected with the second bottom edge, The second bottom edge and the second side edge are all circular arc surface structures, the third side edge is a planar structure, and the second side edge is corresponding to one of the oblique curved panels of another adjacent composite panel The second side edges are welded together by side weld lines, and the third side edges coincide with the first side edges.

Further, the four composite plates are respectively connected by four side welding lines, and the four first bottom edges form a square opening for welding with the square tube, and the four second bottom edges form one for Round opening for round tube welding.

The invention also provides a three-dimensional modeling method for a circular square tube transition node, comprising the following steps:

Step 1: Establish a plane rectangular coordinate system OXY, and draw an inner circle (r=1330mm) and an outer circle (R=1400mm) with the origin as the center, and the two circles form a ring, and draw a square in the coordinate system. An interface, the square interface is moved to a design height (Z=4000 mm), and an auxiliary regular octagon is formed in the bottom circle, and four of the ends of the regular octagon are disposed on the coordinate axis, and the connection is The end point A on the Y-axis in the circle and Cartesian coordinate system is connected to the corner point B of the inscribed square;

Step 2: Remove the bottom circle and the AB connection in step 1, and in the same coordinate system, take the bottom ring as the cross section, and the AB connection as the bus bar, and draw the inclined cylinder;

Step 3: taking the section OAB and the section OBC as the section cutting plane, and obtaining the curved surface ABC whose bottom is an eighth arc, wherein the point C is a corner point of the octagon;

Step 4: Move the curved surface ABC into the same position of the bottom circle in step 3, and obtain other curved surfaces in the same way to form a flat isosceles triangle and two oblique curved panels, and finally form a circular square tube transition node. A model of a three-dimensional graphic.

Beneficial effect

The three-dimensional modeling method for the circular square tube transition node provided by the embodiment of the present invention can be realized by setting the combined surface of the combined board into a planar isosceles triangular plate and a curved surface curved curved panel, so that the combined plate can be placed after the stakeout At the same time of direct assembly and use, the force of the transition node is ensured to be uniform, the force transmission is reliable, and the connection bearing performance is good. In addition, the rolling process can be determined according to the dimensional change requirements of the building design, and is suitable for the transition node design of various sizes. Universally applicable; and the combined surface formed by the flat triangular plate and the inclined arc panel can more easily and accurately determine the blanking size, and can greatly reduce the stress concentration and cracking caused by rolling; the round square node can pass through the plate The machining does not require the use of forging steel or steel castings to process, which effectively reduces the cost of the square joints, and can also be applied to the design of round square joints with large sections and large thicknesses.

DRAWINGS

1 is a perspective view of a transitional node of a square square tube according to an embodiment of the present invention.

2 is a schematic diagram of a selected node bus bar of the circular square tube transition node of FIG. 1 in three-dimensional modeling.

FIG. 3 is a schematic diagram of a bus bar determined in the three-dimensional modeling of the square tube transition node of FIG. 1. FIG.

Figure 4 is a schematic illustration of an oblique cylinder made in accordance with the selected bus bar.

Figure 5 is a schematic illustration of two cut planes of the oblique cylinder of Figure 4.

Figure 6 is a schematic illustration of an oblique arc panel taken from the oblique cylinder of Figure 4.

Figure 7 is a schematic illustration of the round square tube transition node of Figure 1 when combined.

FIG. 8 is a schematic diagram of the completion of the combination of the square tube transition nodes of FIG. 1. FIG.

Embodiments of the invention

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to FIG. 1 to FIG. 7 , a three-dimensional modeling method for a circular square tube transition node provided by an embodiment of the present invention includes the following steps:

Step 1: Establish a plane rectangular coordinate system, and draw the inner circle (r=1330mm) and the outer circle (R=1400mm) with the origin as the center to form a ring, and draw a square interface in the coordinate system. The square interface is moved to a design height (Z=4000 mm), and an auxiliary regular octagon is made in the bottom circle, and four of the ends of the regular octagon are placed on the coordinate axis to connect the inscribed circle with The end point A on the Y axis is connected to the corner point B of the inscribed square (shown in Figure 1);

Step 2: Remove the bottom circle and the AB line in Figure 1, and in the same coordinate system, take the bottom ring as the cross section, and the AB line as the bus bar, and draw the inclined column (shown in Figure 2);

Step 3: taking the section OAB and the section OBC as the section cut surface, and obtaining the curved surface ABC whose bottom is an eighth arc, wherein point C is a corner point of the octagon (shown in FIG. 3);

Step 4: Move the curved surface ABC in Fig. 4 into the same position of the bottom circle in Fig. 2, and obtain the other 7 curved surfaces in the same way. The combined surfaces in the four directions are a flat isosceles triangle and two The oblique curved panel (shown in Figures 4 and 5) finally forms a three-dimensional graphic model (shown in Figures 6 and 7).

Referring to FIG. 8 , a circular square tube transition node formed by the three-dimensional modeling method is used for connecting a circular tube and a square tube member in a building steel structure, and the round square tube transition node is composed of four identical structures. The composite panel 100 is welded. Each of the composite panels 100 includes a triangular plate 1 and two oblique curved panels 2, the triangular panels 1 being located at an intermediate position of the composite panel 100, and the two oblique curved panels 2 are respectively located at two of the triangular panels 1 side.

The triangular plate 1 is an isosceles triangle, and its surface is flat, and can be directly assembled after being staked. The triangular plate 1 comprises a first bottom edge 10 and two first side edges 11. The two first side edges 11 are respectively connected to the first bottom edge 10, the two first side edges 11 intersect, and the first bottom edge 10 and the first side edge 11 are both planar structures.

The oblique curved panel 2 is made of a slanted cylinder whose virtual bottom surface is a circle, and its surface has a curved surface structure. The oblique curved panel 2 includes a second bottom edge 20, a second side edge 21, and a third side edge 22, and the second side edge 21 and the third side edge 22 respectively intersect the second bottom edge 20. The second bottom edge 20 and the second side edge 21 are all circular arc surface structures, and the third side edge 22 is a planar structure. The second side 21 is welded to the corresponding second side 21 of one of the inclined panels 2 of the other composite panel 100 by a side weld line 4, and the third side 22 is the first side The side edges 11 coincide.

When the round square tube transition node is assembled, the second side 21 of the oblique curved panel 2 corresponding to the four composite panels 100 are welded together by the side welding line 4, thereby forming an upper end by the four A square opening (not numbered) formed by the first bottom edge 10 and a circular opening (not numbered) formed by the four second bottom edges 20 at the lower end. The square opening is for welding to a square tube for welding to a circular tube.

The circular square tube transition node made by the three-dimensional modeling method provided by the embodiment of the present invention is configured by setting the combined surface of the combined board into a planar isosceles triangular plate and a curved surface curved curved panel, so that the combined plate is After the stakeout can be directly assembled and used, the stress of the transition node is uniform, the force transmission is reliable, and the connection bearing performance is good. In addition, the rolling process can be determined according to the dimensional change requirements of the building design, and is adapted to various sizes of transition nodes. The design has universal applicability; and the combined surface formed by the flat triangular plate and the inclined arc panel can more easily and accurately determine the blanking size, and can greatly reduce the stress concentration and cracking caused by rolling; It can be processed by sheet metal, and it does not need to be processed by forging steel or steel casting. It can effectively reduce the cost of the square joint and can also be applied to the design of round square joints with large section and large thickness.

The above is only the 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 protection of the present invention. Within the scope.

Claims

A circular square tube transition node includes four composite panels of identical construction, each composite panel comprising a planar isosceles triangular plate and two curved planar curved curved panels, the triangular panels being located in the combination In the middle position of the plate, the two oblique curved panels are respectively located on two sides of the triangular plate; the oblique curved plate is rolled by a rolling line of a slanted cylinder along a circular bottom surface.
The circular square tube transition node according to claim 1, wherein the triangular plate comprises a first bottom edge and two first side edges, and the two first side edges respectively correspond to the first bottom edge The two first sides intersect, and the first bottom edge and the first side edge are both planar structures.
The circular square tube transition node according to claim 2, wherein the oblique curved panel comprises a second bottom edge, a second side edge and a third side edge, the second side edge and the third side The sides are respectively connected to the second bottom edge, and the second bottom edge and the second side edge are both arcuate surface structures, the third side edge is a planar structure, and the second side edge and the other side Corresponding second sides of one of the slanted panels of an adjacent composite panel are welded together by side weld lines, the third side being coincident with the first side edges.
The round square tube transition node according to claim 3, wherein the four composite plates are respectively connected by four side welding lines, and the four first bottom edges form a square opening for welding with the square tube. The four second bottom edges form a circular opening for welding to the circular tube.
A three-dimensional modeling method for a circular square tube transition node includes the following steps:

Step 1: Establish a plane rectangular coordinate system OXY, and draw an inner circle (r=1330mm) and an outer circle (R=1400mm) with the origin as the center, and the two circles form a ring, and draw a square in the coordinate system. An interface, the square interface is moved to a design height (Z=4000 mm), and an auxiliary regular octagon is formed in the bottom circle, and four of the ends of the regular octagon are disposed on the coordinate axis, and the connection is The end point A on the Y-axis in the circle and Cartesian coordinate system is connected to the corner point B of the inscribed square;

Step 2: Remove the bottom circle and the AB connection in step 1, and in the same coordinate system, take the bottom ring as the cross section, and the AB connection as the bus bar, and draw the inclined cylinder;

Step 3: taking the section OAB and the section OBC as the section cutting plane, and obtaining the curved surface ABC whose bottom is an eighth arc, wherein the point C is a corner point of the octagon;

Step 4: Move the curved surface ABC into the same position of the bottom circle in step 3, and obtain other curved surfaces in the same way to form a flat isosceles triangle and two oblique curved panels, and finally form a circular square tube transition node. A model of a three-dimensional graphic.