CN106193449A - A kind of preparation method of variable cross-section Honeycomb Beam web - Google Patents

Abstract

The invention discloses a method for preparing a variable-section honeycomb beam web, which calculates the round hole size and opening position of the pre-prepared honeycomb beam web through the H-shaped steel variable-section solid web. Draw a semicircle on the parallel line to determine the expansion ratio and the center position and radius of the circular hole with variable cross-section on the web to be opened, and make a semicircle curve. Then the slats are cut into two semicircular wavy steel plates according to the curve, and the upper and lower two steel plates are butted with misplaced round holes, and welded to meet the design size of the web to be prepared. The invention can greatly improve the utilization rate of raw materials, has a wide production range, and has simple and easy-to-operate techniques. The production efficiency of variable cross-section honeycomb beam web is greatly improved, especially the waste generated by the hole is less, the steel material is saved, and the production cost is reduced. The concave hole parts obtained by cutting and trimming multiple H beams can be welded continuously, improving processing speed.

Description

A preparation method of honeycomb beam web with variable cross-section

technical field

The invention relates to a method for preparing a variable-section honeycomb beam web in the field of building steel structures.

Background technique

Steel beam is one of the main load-bearing components in steel structure engineering. The difference in the magnitude of the force on both sides of the beam determines that the web adopts the form of variable cross-section. At the same time, in order to increase the bending moment of inertia of the beam, the height of the beam is usually made larger. At this time, the web often cannot give full play to the role of steel. Therefore, appropriate amount of openings in the variable-section web can reduce the steel consumption without affecting the bearing capacity, which has better technical and economic effects. At the same time, the openings can be used as channels for various pipelines to pass through, which is beneficial to improving the space utilization efficiency inside the structure.

At present, most of the open-hole H-shaped steel beams produced and used at home and abroad use honeycomb beam webs with equal cross-section hexagons and circular openings. The production process of this kind of beam is relatively simple. Since the bending moment and shear force of beams and columns are different in different positions, it is more reasonable to use webs with variable cross-sections. Therefore, the application prospect of variable-section honeycomb beam webs is broad, but there is no basis for fabrication, and the research only stays at the stage of equal-section webs. Since the opening theory of variable cross-section has not been studied, the production unit cannot produce the web of variable-section honeycomb beams.

Contents of the invention

The technical problem to be solved by the present invention is to provide a preparation method of variable cross-section honeycomb beam webs, which greatly improves the production efficiency of variable cross-section honeycomb beam webs, reduces waste generated by opening holes, saves steel materials, and reduces production costs.

In order to solve the problems existing in the prior art, the technical solution adopted in the present invention is:

A method for preparing a variable-section honeycomb beam web, comprising the following steps:

(1) Select a pre-prepared web of the same size and material as the variable cross-section solid web, and obtain the first round hole web to be prepared according to the heights h1 and h2 of both sides of the variable cross-section solid web and the flange length L A circular hole radius R1;

(2) Set the distance m and s between the round hole of the pre-prepared web and the upper and lower edges of the web, and the distance a between the outermost edges of the adjacent round holes of the pre-prepared web, where the inclination angle 2θ of the web is obtained by the formula:

m and s satisfy the relation

(3) Obtain the radius R _n of the round hole of the prefabricated variable cross-section web through the above conditions, and the prefabricated web is made by opening the hole on the basis of the solid web; The radius can be obtained by connecting the uppermost edge of the round hole with variable cross-section parallel to the upper flange, where:

R1 is obtained by the formula:

Rn is obtained by the formula:

(4) The heights h1' and h2' of the variable section at both ends of the prefabricated web are respectively converted from the variable section heights h1 and h2 at both ends of the prefabricated web; and the distance n and the shortest distance b between the two boundary lines of the web to be opened are determined ;Where: n and b should satisfy b=ncosθ;

(5) At a height of m from the upper flange, the intersection point formed by a straight line parallel to the upper flange and the side of the smaller height of the web is taken as the starting point of n1, and the inclination angle of the web to be prepared is made through this point Half of θ is to make boundary line n1, and at the same time, make boundary line n2 at the smaller side web h1' with distance n1 equal to n=R1-sin(a+R1) and parallel to n1;

(6) Mark the distance between the outer edges of two adjacent circles as a and the center of the circular hole with variable cross-section according to a, R1, a, R2.....on the upper and lower boundary lines n1 and n2 respectively and draw a semicircle . And trace the corresponding semicircle curve; the starting point of one of the semicircle curves is on another circle with radius R1, forming two upper and lower semicircle curves;

(7) Cut the web along two semicircular curves to obtain a concave hole part containing a semicircular depression. The trimming line composed of a semicircular curve on another boundary line and a line segment group parallel to and on the same side as the boundary line is obtained containing The concave hole part of the semicircular depression;

(8) Weld the concave hole parts of the upper and lower slats obtained in step (7) in such a way that the semicircular depressions are opposite and the line segment groups are opposite; obtain the honeycomb beam web plate with variable cross-section circular holes to be made.

The straight line formed by the circle centers of the web holes of the variable-section honeycomb beam is on the same straight line, and the distance between the outermost edges of two adjacent circles is the same.

The inclination angle 2θ of the variable-section honeycomb beam web is less than 90°, θ<45°, and the angle between the center of the circle and the upper flange is θ on the same straight line.

The tangents of the upper edges of all the round holes of the variable-section honeycomb beam web are on the same straight line and parallel to the upper flange, the tangents of the lower edges are on the same straight line and parallel to the lower flange, and the upper and lower tangents of all circles are connected The line is symmetrical about the line where the center of the circle lies.

Advantage and effect that the present invention has are:

The method of the invention breaks through the bottleneck of the traditional variable-section solid-web type that cannot open holes, and calculates the round hole size and opening position of the prefabricated honeycomb beam web through the H-shaped steel variable-section solid-web type web. Draw a semicircle on the parallel line to determine the expansion ratio and the center position and radius of the circular hole with variable cross-section on the web to be opened, and make a semicircle curve. Then the slats are cut into two semicircular wavy steel plates according to the curve, and the upper and lower two steel plates are butted with misplaced round holes, and welded to meet the design size of the web to be prepared. Compared with the prior art, the raw materials are all made of steel plates, which reduces the material loss caused by directly opening holes on the variable-section web. It also breaks the restriction on the specifications of honeycomb variable-section beam webs made of finished H-beams, thereby avoiding the restrictions on specifications when purchasing rolled H-beams in traditional processes, which can greatly improve the utilization rate of raw materials, and the production range is wide. Simple and easy to operate. The production efficiency of variable cross-section honeycomb beam web is greatly improved, especially the waste generated by the hole is less, the steel material is saved, and the production cost is reduced. The concave hole parts obtained by cutting and trimming multiple H beams can be welded continuously, improving processing speed.

Description of drawings

Fig. 1 is the structure schematic diagram of variable section solid web type web;

Fig. 2 is a schematic diagram of the parallel lines n1 and n2 for determining the expansion ratio of the web to be drilled;

Fig. 3 is the schematic diagram of the recessed hole part and the trimming line of the flange part obtained after the web plate to be drilled is cut according to the curve;

Fig. 4 is a schematic diagram of a prefabricated beam web obtained after dislocation phase welding.

detailed description

A method for preparing a variable-section honeycomb beam web includes the following steps: In this embodiment, a variable-section round-hole honeycomb beam is taken as an example, and the variable-section web is composed of upper and lower semicircular curved slats.

(1) As shown in Figure 1, select a prefabricated web of the same size and material as the variable cross-section solid web, and obtain a reasonable desired circle according to the heights h1 and h2 on both sides of the variable cross-section solid web and the length L of the flange. The first circular hole radius R1 of the hole web.

(2) As shown in Figure 2, the distance m and s between the round hole of the prefabricated web and the upper and lower edges of the web and the distance a between the outermost edges of the adjacent round holes of the prefabricated web are artificially set. in:

The web inclination 2θ can be obtained by the formula:

m and s should satisfy the relation

(3) The radius R _n of the round hole of the prefabricated variable cross-section web can be obtained through the above conditions, and the prefabricated web is formed by opening holes on the basis of the solid web. The radius can be obtained by ensuring that the straight line formed by the uppermost edge of the variable cross-section circular hole produced after the dislocation welding of the semicircular curved strip is parallel to the upper flange, where:

R1 can be obtained by the formula:

Rn can be obtained by the formula:

(4) As shown in Figure 3, the heights h1' and h2' of the variable sections at both ends of the prefabricated web can be converted respectively from the variable section heights h1 and h2 at both ends of the prefabricated web. And determine the distance n and the shortest distance b between the two boundary lines of the web to be opened. Among them: n and b should satisfy b=ncosθ.

The requirements for the honeycomb variable cross-section beam web to be fabricated are as follows:

① In order to ensure that the two semicircular curved slats can be accurately docked after the misplaced hole is made, the straight line connected by the center of the round hole in the web to be made must be on the same straight line and the distance between the outermost edges of the two adjacent circles is the same as a.

②The inclination angle 2θ of the honeycomb beam web with variable cross-section round holes should be less than 90°, that is, θ<45°, and the angle between the center of the circle and the upper flange is θ on the same straight line.

③The tangents of the upper edges of all round holes are on the same straight line and parallel to the upper flange, the tangents of the lower edges are on the same straight line and parallel to the lower flange, and the straight line formed by the upper and lower tangents of all circles is symmetrical to the line where the center of the circle is.

Select the web with the same shape and slope as the prefabricated honeycomb beam web, and the height h1' of the smaller side of the variable-section web and the height h2' of the smaller side of the variable-section web to be made holes satisfy h1'= h1-b/cosθ, h2'=h2-b/cosθ, where h1 and h2 represent the heights of both sides of the variable section of the web to be prepared respectively.

⑸ At a height of m from the upper flange, make the intersection point formed by a straight line parallel to the upper flange and the side of the smaller height of the web as the starting point of n1, and make half of the inclination angle of the web to be prepared through this point That is, θ draws a boundary line n1, and at the same time, draws a boundary line n2 at a distance n1 of n=R1-sin(a+R1) and parallel to n1 at the web h1' on the smaller side.

(6) On the upper and lower boundary lines n1 and n2 respectively, mark the distance between the outer edges of two adjacent circles according to a, R1, a, R2.... and draw a semicircle . And draw the corresponding semicircle curve. The starting point of one of the semicircle curves is on another circle with a radius of R1, forming two upper and lower semicircle curves.

(7) Cut the web along two semicircular curves to obtain the concave hole part containing semicircular depressions, and trim the semicircular curve on another boundary line and the line segment group parallel to and on the same side as the boundary line to obtain The part of the well that contains a semicircular depression.

(8) As shown in Figure 4, weld the concave hole parts of the upper and lower slats obtained in step (7) in such a way that the semicircular depressions are opposite and the line segment groups are opposite. Obtain the described desire to make variable cross-section circular hole honeycomb beam web.

Among them, when selecting the H-beam web with variable cross-section to be opened, the following factors should be considered:

① From the geometric relationship of the web to be drilled, it can be seen that the distance b between n1 and n2 should meet the condition b<R _n , the minimum distance a between the edges should satisfy a<2R1, and b=ncosθ.

② In order to satisfy that the upper edge of all circles does not exceed the flange, the relationship m+n>R1-(a+R1)sinθ should be satisfied.

The above are only preferred embodiments of the patent of the present invention, but the scope of protection of the patent of the present invention is not limited thereto. Any skilled person familiar with the technical field can easily think of changes or Replacement should be covered within the protection scope of the patent of the present invention. Therefore, the scope of protection of the patent for the present invention should be determined by the scope of protection defined in the claims.

Claims (4)

1. the preparation method of a variable cross-section Honeycomb Beam web, it is characterised in that comprise the following steps:

(1) select and variable cross-section steel flanged beam same size and the pre-prepared web of material, according to variable cross-section steel flanged beam web both sides Highly h1 and h2 and edge of a wing length L try to achieve first circle hole radius R1 of circular hole web to be prepared；

(2) pre-prepared web circular hole and distance m of web lower edges and s and pre-prepared web adjacent circular holes ragged edge are set Intermarginal away from a, wherein:

Web inclination angle 2 θ is tried to achieve by formula:

M and s meets relation

(3) the radius R of pre-prepared variable cross-section web circular hole is tried to achieve by conditions above_n, on the basis of steel flanged beam web, perforate is i.e. For pre-prepared web；Straight by ensureing that the variable cross-section circular hole uppermost edge that the dislocation of half-round curve lath produces after welding is linked to be Radius can be tried to achieve in the parallel top flange of line, wherein:

R1 is tried to achieve by formula:

Rn is tried to achieve by formula:

(4) converted respectively by prefabricated web two ends variable cross-section height h1, h2 obtain web two ends to be opened variable cross-section height h1 ' and h2’；And determine two boundary line spacing n and the shortest spacing b thereof of web to be opened；Wherein: n and b should meet b=ncos θ；

(5) at away from top flange height by m, make what a straight line being parallel to top flange and web were linked to be compared with low height side Intersection point is as the starting point of n1, and is the half i.e. θ with web inclination angle to be prepared by this point and makes boundary line n1, simultaneously less The boundary line n2 that distance n1 is n=R1-sin (a+R1) and parallel n1 is made at one coxostermum h1'；

(6) respectively at upper and lower two boundary line n1, n2 is upper to be marked between adjacent two circle outward flanges according to a, R1, a, R2..... Distance be a and the variable cross-section circular hole center of circle draw semicircle.And describe the half-round curve of correspondence；The wherein starting point of a half-round curve On the circumference that another radius is R1, form upper and lower two half-round curve；

(7) the shrinkage pool part containing semi-cylindrical canyon is obtained, in an other boundary line along two half-round curve cutting webs On half-round curve and the trim lines of sets of line segments composition of and homonymy parallel with this boundary line obtain containing semi-cylindrical canyon recessed Bore portion；

(8) the shrinkage pool part of the lath up and down mode relative according to semi-cylindrical canyon, that sets of line segments is relative step (7) obtained is welded Connect；Obtain variable cross-section Circular-hole Castellated Beams web.

The preparation method of a kind of variable cross-section Honeycomb Beam web the most according to claim 1, it is characterised in that described change cuts The be linked to be straight line in the Honeycomb Beam web circular hole center of circle, face is on the same line and adjacent two circle outermost edge spacing are identical.

The preparation method of a kind of variable cross-section Honeycomb Beam web the most according to claim 1, it is characterised in that described change cuts Inclination angle 2 θ of face Honeycomb Beam web is less than 90 °, θ ＜ 45 °, and the center of circle is θ with top flange angle on the same line.

The preparation method of a kind of variable cross-section Honeycomb Beam web the most according to claim 1, it is characterised in that described change cuts Honeycomb Beam web all circular holes top edge place, face tangent line on the same line and is parallel to top flange, and lower limb place tangent line exists On same straight line and be parallel to lower flange, and the straight line that the upper and lower tangent line of all circles is linked to be is symmetrical about place, center of circle straight line.