CN111761309B - H-shaped steel cutting method based on haunching end plate - Google Patents
H-shaped steel cutting method based on haunching end plate Download PDFInfo
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- CN111761309B CN111761309B CN202010589018.5A CN202010589018A CN111761309B CN 111761309 B CN111761309 B CN 111761309B CN 202010589018 A CN202010589018 A CN 202010589018A CN 111761309 B CN111761309 B CN 111761309B
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Abstract
The invention discloses an H-shaped steel cutting method based on haunching end plates, which comprises the following steps: determining an intersection A of a cutting point at the top of a web at the lower part of the upper flange of the section steel beam, cutting the web along the alpha-angle direction of the flange direction of the H-shaped steel beam to an intersection B of the bottom of the web and the lower flange of the H-shaped steel beam, cutting the web along the direction perpendicular to the AB direction to the top C of the web, and cutting the upper flange at the position A, C along the beam height direction to obtain a triangular web ABC with a flange; d points are selected among AC points at the top of the H-shaped steel web plate, the H-shaped steel web plate is cut to an edge E point along the direction which forms an angle of alpha/2 with the flange, and then the H-shaped steel web plate is cut to an edge F along the DF line which forms an angle of alpha with DE at the D point. And cutting the web and the flange along the beam height direction EG at the point E. And cutting the flange at the point D along the beam height direction, rotating the flange DG clockwise by alpha to ensure that DE is coincidently welded with the original DF, and enabling the flange DG to BE perpendicular to the web plate edge BE. The cutting method is simple, convenient and quick, can fully utilize the residual steel for the steel beam, improves the utilization rate of the steel, and effectively saves the engineering cost.
Description
Technical Field
The invention relates to the technical field of civil building structures, in particular to an H-shaped steel cutting method based on haunching end plates.
Background
In the past earthquake, a large number of brittle fracture phenomena of beam-column rigid connection nodes occur in a steel frame, and the phenomenon shows that the traditional rigid node design that beam flanges and columns are connected through full penetration butt welding seams and beam webs and shear plates welded on the columns are connected through high-strength steel bolts does not meet the expected earthquake-resistant design requirements. Brittle fracture occurring in an earthquake mostly occurs at the lower part of a node where plastic deformation is rarely or not developed at all, so that the lower flange of the beam becomes a weak link for fracture. Therefore, the stress of the butt welding seam at the flange of the beam is reduced, and the plastic hinge is forced to be formed at a certain part of the beam, so that the important idea for improving the rigid joint design is provided. In this case, haunch nodes are beginning to be widely used by people.
The haunch is a measure of increasing the cross section of the beam at a predetermined range at one end or both ends of the beam. The steel structure haunch node is formed by welding the haunch on the basis of a common node, the width and the thickness of the haunch are generally the same as those of a beam flange, the thickness of an haunch web is the same as that of a beam web, the included angle between the haunch and the beam flange is about 30 degrees, and the haunch node is connected with a beam column by adopting fillet welds. According to different construction modes, the lower flange haunch node and the upper and lower flange haunch nodes are provided. Because the broken nodes in northern mountains and the Japanese Saka earthquake are more at the intersection of the lower flange of the beam and the column and the arrangement of the floor slab is inconvenient after the upper flange of the beam is subjected to armoring, the research on the armoring nodes is also mostly concentrated on the lower flange armoring nodes. The haunching nature of the beam-column connecting part forces the plastic hinge to appear on the beam far away from the column surface, so that the local stress of the beam-column node is reduced, the node area is protected, the brittle failure of the node is avoided, the bearing capacity of the component is improved, the material is saved, and the clearance of the building is not obviously influenced.
At present, the commonly used haunching nodes in engineering are provided with oblique haunching and straight haunching, and the specification and size of the haunching nodes are not unified, so that engineers are free in designing the haunching, systematization and serialization cannot be achieved, and certain trouble is brought to construction. Secondly, in the past engineering, various steel structure frames can be seen from place to place in the construction site and the left small sections of H-shaped steel are used, which causes great waste to the engineering.
Disclosure of Invention
In view of the above, the invention aims to provide an H-shaped steel cutting method based on an haunching end plate.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for cutting H-shaped steel based on haunch end plates comprises the following steps:
step S1: selecting H-shaped steel, wherein the specification of the H-shaped steel is the same as that of a steel beam of a steel structure frame;
step S2: determining a first cutting point, wherein the first cutting point is a point A at the intersection of an upper flange of the H-shaped steel and the top of a web plate of the H-shaped steel; cutting the web plate of the H-shaped steel from a point A along the alpha angle direction of the flange direction of the H-shaped steel until a point B at the intersection of the bottom of the web plate of the H-shaped steel and the lower flange of the H-shaped steel;
step S3: further cutting the web plate of the H-shaped steel along the direction perpendicular to the line segment AB; until a point C at the intersection of the web plate of the H-shaped steel and the upper flange of the H-shaped steel;
step S4: cutting the upper flange at the point A along the height direction of the H-shaped steel, and cutting the upper flange at the point C along the height direction of the H-shaped steel;
step S5: determining a second starting point, wherein the second starting point is one point D on the line segment AC; cutting the web plate of the H-shaped steel from a point D along the alpha/2 angle direction of the flange direction of the H-shaped steel until reaching a point E at the edge of the web plate of the H-shaped steel; cutting the web plate of the H-shaped steel from a point D along a direction forming an alpha angle with the direction of the line segment DE until reaching a point F at the edge of the web plate of the H-shaped steel;
step S6: cutting out a region in the triangular DEF on the web of the H-shaped steel;
step S7: sequentially cutting off the web plate of the H-shaped steel and the upper flange of the H-shaped steel from a point E along the beam height direction until reaching a point G;
step S8: cutting the upper flange of the H-shaped steel along the beam height direction at the point D;
step S9: and simultaneously rotating the part from the point D to the point G in the upper flange of the H-shaped steel and the area in the triangular DEG on the web plate of the H-shaped steel clockwise by an angle of alpha/2 until the line segment DE and the line segment DF are superposed and welded.
The above mentioned cutting method for H-shaped steel based on haunching end plate, wherein, it also includes:
step S10: points a, B, G and D are drilled.
In the above method for cutting H-shaped steel based on the haunching end plate, the angle α is 30 °.
In the above method for cutting the H-shaped steel based on the haunching end plate, the distance from the point D to the point G is 200 cm.
Due to the adoption of the technology, compared with the prior art, the invention has the following positive effects:
(1) through the steps of the invention, the corresponding steel structure haunching node can be obtained, and the node series of the system can be obtained through the sorting calculation of the haunching node parameters, thereby providing convenience for design and construction.
(2) According to the invention, each steel structure frame can be cut into corresponding haunched nodes according to the type of the steel beam, and each haunched node can obtain corresponding parameters according to theoretical calculation, so that unified serial nodes are obtained, and engineering design and construction service is better provided.
(3) The cutting method is simple, convenient and quick, can fully utilize the residual steel for the steel beam, improves the utilization rate of the steel, and effectively saves the engineering cost.
Drawings
Fig. 1 is a first schematic diagram of the cutting method of the H-shaped steel based on the haunch end plate.
Fig. 2 is a second schematic diagram of the cutting method of the H-shaped steel based on the haunch end plate.
FIG. 3 is a schematic drawing of the present invention for cutting H-section steel based on haunching end plate.
Fig. 4 is an installation schematic diagram of the H-shaped steel cutting method based on the haunch end plate.
Detailed Description
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
Fig. 1 is a first schematic view of an H-section steel cutting method based on an axillary end plate of the present invention, fig. 2 is a second schematic view of the H-section steel cutting method based on the axillary end plate of the present invention, fig. 3 is a schematic view of the H-section steel cutting method based on the axillary end plate of the present invention, fig. 4 is an installation schematic view of the H-section steel cutting method based on the axillary end plate of the present invention, please refer to fig. 1 to 4, which show an H-section steel cutting method based on the axillary end plate of a preferred embodiment, comprising:
step S1: and selecting H-shaped steel, wherein the specification of the H-shaped steel is the same as that of the steel beam of the steel structure frame.
Step S2: and determining a first cutting point, wherein the first cutting point is a point A at the intersection of the upper flange of the H-shaped steel and the top of the web plate of the H-shaped steel. Point a may be any point on the H-section steel at the intersection of the top flange and the top of the web.
And (3) cutting the web plate of the H-shaped steel from the point A along the angle alpha direction of the flange direction of the H-shaped steel (namely the direction from the top left to the bottom right in the figure 1) to the point B at the intersection of the bottom of the web plate of the H-shaped steel and the lower flange of the H-shaped steel.
Step S3: the web of the H-section steel is further cut in a direction perpendicular to the line segment AB (i.e., the lower left to upper right direction in fig. 1). Up to the point C where the web of the H-beam intersects the upper flange of the H-beam.
Step S4: the upper flange at the point a is cut in the height direction of the H-section steel, and the upper flange at the point C is cut in the height direction of the H-section steel (i.e., the vertical direction in fig. 1).
Step S5: a second point of origin is determined, which is one of the points D on the line segment AC. The point D may be any point on the line segment AC, and the specific position of the point D may be calculated according to the actual requirement of the Le length.
And cutting the web of the H-shaped steel from the point D along the angle direction of alpha/2 of the flange direction of the H-shaped steel (namely the DE line direction in figure 1) to the point E at the edge of the web of the H-shaped steel.
The web of H-section steel is cut from point D in a direction at an angle a to the direction of the line segment DE (i.e. the direction of line DF in fig. 1) to point F at the edge of the web of H-section steel.
Step S6: the area in the triangular DEF on the web of the H-beam is cut away.
Step S7: the web of the H-section steel and the upper flange of the H-section steel are cut off sequentially from point E in the beam height direction (i.e., the vertical direction in fig. 1) to point G.
Step S8: the upper flange of the H-section steel is cut in the beam height direction (i.e., the vertical direction in fig. 1) at a point D.
Step S9: and simultaneously clockwise rotating the part from the point D to the point G in the upper flange of the H-shaped steel and the area in the triangular DEG on the web plate of the H-shaped steel by an angle of alpha/2 until the line segment DE and the line segment DF are superposed and welded to obtain the haunched steel 1.
Step S10: and drilling the point A, the point B, the point G and the point D for subsequent welding.
Further, as a preferred embodiment, the angle α is 30 °.
Further, as a preferred embodiment, the distance from point D to point G is 200 cm.
And (3) calculating and determining each parameter of the cut haunching section steel 1 according to the known beam height Hb, the flange thickness Tf and the cutting angle alpha:
BL＝(Hb-2Tf)/(sinαcosα)
He＝[(Hb-2Tf)/(sinαcosα)-Le/cosα]sinα+Tf
A1＝Le2tan(α/2)
A2＝[Le2tan2(α/2)tanα]/2
through calculation, the rotated DE and DF are equal in length, and the rotated flange DG is perpendicular to the BE. During design, values of alpha (a standard value of 30 degrees in the invention) and Le (a standard value of 200 in the invention) are adjusted to determine values of He and LB, so that haunching section steel 1 with different specifications and sizes can be obtained, and the goal of node serialization systematization is achieved.
Please refer to fig. 4, the cut haunch steel 1 is used in a steel frame beam-column node, the flange of the haunch steel 1 is welded with the end plate and the lower flange of the frame beam, the web of the haunch steel 1 is welded with the joint of the beam and the end plate, and a stiffening rib can be set properly according to the engineering requirement to ensure the strength of the node.
The table below shows one of the haunching node parameters (α ═ 30 °, Le ═ 200) obtained by this tailoring method.
H-shaped steel cutting series haunch node parameter table
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (4)
1. A cutting method of H-shaped steel based on haunching end plates is characterized by comprising the following steps:
step S1: selecting H-shaped steel, wherein the specification of the H-shaped steel is the same as that of a steel beam of a steel structure frame;
step S2: determining a first cutting point, wherein the first cutting point is a point A at the intersection of an upper flange of the H-shaped steel and the top of a web plate of the H-shaped steel; cutting the web plate of the H-shaped steel from a point A along the alpha angle direction of the flange direction of the H-shaped steel until a point B at the intersection of the bottom of the web plate of the H-shaped steel and the lower flange of the H-shaped steel;
step S3: further cutting the web plate of the H-shaped steel along the direction perpendicular to the line segment AB; until a point C at the intersection of the web plate of the H-shaped steel and the upper flange of the H-shaped steel;
step S4: cutting the upper flange at the point A along the height direction of the H-shaped steel, and cutting the upper flange at the point C along the height direction of the H-shaped steel;
step S5: determining a second starting point, wherein the second starting point is one point D on the line segment AC; cutting the web plate of the H-shaped steel from a point D along the alpha/2 angle direction of the flange direction of the H-shaped steel until reaching a point E at the edge of the web plate of the H-shaped steel; cutting the web plate of the H-shaped steel from a point D along a direction forming an alpha angle with the direction of the line segment DE until reaching a point F at the edge of the web plate of the H-shaped steel;
step S6: cutting out a region in the triangular DEF on the web of the H-shaped steel;
step S7: sequentially cutting off the web plate of the H-shaped steel and the upper flange of the H-shaped steel from a point E along the beam height direction until reaching a point G;
step S8: cutting the upper flange of the H-shaped steel along the beam height direction at the point D;
step S9: and simultaneously rotating the part from the point D to the point G in the upper flange of the H-shaped steel and the area in the triangular DEG on the web plate of the H-shaped steel clockwise by an angle of alpha/2 until the line segment DE and the line segment DF are superposed and welded.
2. The method for cutting the H-shaped steel based on the haunch end plate according to the claim 1, further comprising the following steps:
step S10: points a, B, G and D are drilled.
3. The method for cutting the H-shaped steel based on the haunch end plate according to the claim 1, wherein the angle alpha is 30 degrees.
4. The method for cutting the H-shaped steel based on the haunch end plate according to the claim 1, wherein the distance between the point D and the point G is 200 cm.
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