CN101220697A - Double corrugated web steel box composite beam - Google Patents

Abstract

The invention belongs to the technical field of architectural profiles and particularly relates to a double corrugated web steel box composite beam. The sectional shape of the invention is composed of two symmetrically arranged corrugated webs, a top flange and a lower flange. The top flange is parallel with the lower flange, the web is vertical to the top flange and the lower flange, the web and the flange are connected by single-side fillet joint, and the web has periodically repetitive trapezoidal wave or sinusoid wave along the length direction. The top of the composite beam is a reinforced concrete wing plate and a profiling steel plate. The top flange, the reinforced concrete slab and the profiling steel plate are connected each other by male pins, and a transverse reinforcement can be additionally used for the connection between the reinforced concrete wing plate and the profiling steel plate. The invention can replace the traditional hot rolled flange beam, H-beam composite beam and welded steel box composite beam; furthermore, the invention has wider application than the flange beam and the H-beam composite beam, and can realize maximization to be used in special fields and special places, including the construction of wide-span industrial and civilian buildings and wide-span bridges, etc.

Description

Double corrugated web steel box composite beam

technical field

The invention belongs to the technical field of building profiles, in particular to a steel box composite girder with double corrugated webs.

Background technique

At present, ordinary hot-rolled I-beams, hot-rolled H-beams and welded H-beam composite beams are commonly used in similar fields. The above-mentioned composite beam is composed of a lower steel beam and an upper reinforced concrete slab through shear connectors to form a force-bearing member. The steel beam is generally made of hot-rolled I-beam, hot-rolled H-beam and welded H-beam. This design can be seen in the patent - Combination Beam (ZL 95195718.X). In addition, there are also steel box girders welded by flat steel plates, which form flat web steel box composite girders with concrete slabs.

Ordinary hot-rolled I-beams and H-beams are hot-rolled in the factory. Due to the limitation of processing technology, their webs must be straight plates. The welded H-shaped steel is to weld two flange plates and a plane web together to form an H-shaped section. When the specifications of the hot-rolled steel cannot meet the requirements, welded H-shaped steel can be used. However, the welding of H-shaped steel mostly uses two-sided fillet welds, and the welding workload is relatively large.

Ordinary hot-rolled I-beams and H-beams use a large amount of steel. The main reason is that the buckling resistance of the flat web is low, so the web thickness needs to be increased. The same problem exists in welded H-shaped steel, so the height-to-thickness ratio of the web needs to be limited during design, resulting in a generally thicker web, so the amount of steel used is too large. In addition, when using welded H-beams, special technical measures must be taken, such as stiffening ribs or using the strength of the web after buckling, etc., and the design and construction are more complicated.

The welded steel box girder is welded by four steel plates, two of which are used as the web, placed in parallel, and the two flange plates are perpendicular to the web, and the flanges are parallel to each other, and the flange and the web are connected by welding. This kind of component optimizes the performance of the component to a certain extent, especially the box-shaped section, which significantly improves the lateral deformation resistance and the overall torsional resistance of the component, but because it still uses flat steel plates as webs, so The amount of steel used for the web is still relatively large.

my country's current steel structure code (GB50017-2003) has strict regulations on the web height-thickness ratio of welded H-shaped steel and welded steel box girders. When it exceeds a certain limit, certain methods such as welding stiffeners must be used to strengthen the web , This will increase the processing workload, and the welding process will also cause adverse effects such as stress concentration, and it is difficult to realize automated production. Moreover, due to the limitations of processing technology and processing equipment, traditional hot-rolled I-beams and H-beams are difficult to achieve large-scale products. When the required load-carrying capacity and rigidity are relatively large, traditional products are difficult to meet the requirements. If it is completed by designing, processing and welding H-shaped steel, it will be labor-intensive and time-consuming, which will increase the cost and affect the construction speed.

It is the research goal of those skilled in the art to study and discuss the use of double corrugated web steel box girders instead of traditional steel beams as steel beams in composite beams, and then apply them in the field of multi-story buildings to achieve cost reduction, performance optimization, and long service life. .

Contents of the invention

The object of the present invention is to provide a double corrugated web steel box composite girder with low cost, superior performance and long service life.

The double corrugated web steel box composite beam proposed by the present invention is composed of upper flange 1, web 2, web 3, lower flange 4, profiled steel plate 5 and reinforced concrete flange 8, and its structure is shown in Figure 1 -3 shown. Among them, the upper flange 1 is parallel to the lower flange 4, the web 2 and the web 3 are vertically located between the upper flange 1 and the lower flange 4 respectively, and the sections of the web 2 and the web 3 are uniform or uneven Periodically repeating waveform, the corrugated cross-section is arc angle trapezoid or sinusoidal curve, see Figure 4 and Figure 5 respectively, the reinforced concrete wing plate 8 is located above the profiled steel plate 5, the profiled steel plate 5 is located above the upper flange 1, and the steel bar The concrete wing plate 8, the profiled steel plate 5, and the upper flange 1 are fixed by the studs 6, which can be used as shear connectors to connect the reinforced concrete wing plate 8, the profiled steel plate 5, and the upper flange 1 of the steel beam into a whole , the transverse reinforcement 7 is welded to the upper part of the profiled steel plate 5, which can be used as a connecting piece between the profiled steel plate 5 and the reinforced concrete slab 8.

In the present invention, the inclination angle of the oblique line segment of the arc-angle trapezoid is 30-90°.

In the present invention, the web 2 and the upper flange 1 or the lower flange 4 are respectively single-sided fillet welds.

In the present invention, there are single-side fillet welds between the web 3 and the upper flange 1 or the lower flange 4 respectively.

In the present invention, the webs 2 and 3 are placed symmetrically and have a honeycomb cross-sectional structure.

In the present invention, the corrugated shapes of the web 2 and the web 3 are made by numerically controlled bending technology or numerically controlled rolling technology. And the density and height of corrugations of web 2 and web 3 can be changed according to requirements.

The invention optimizes the section mechanical properties of steel girders in composite beams by changing the web shapes of hot-rolled H-shaped steels, welded H-shaped steels and welded steel box girders, and produces this product through processes such as web forming, fully automatic welding, anti-corrosion, and fire-resistant treatment. Invent products.

In the present invention, the reinforced concrete wing plate 8 is a reinforced concrete material, and the component 5 is a profiled steel plate, which can be used as a permanent formwork for the reinforced concrete wing plate 8. They are connected by studs 6.

The preparation process of the present invention is as follows: the strip steel is bent along the length direction to form a trapezoidal corrugated web with an arc angle, or rolled into a sinusoidal corrugated web, and then welded to the two wing plates to form a box shape section. The biggest feature of this new section combination is that it optimizes the relationship between the mechanical properties of the section and the amount of steel used in the product to a greater extent, making it more rational and scientific. Therefore, the present invention has the characteristics of high bearing capacity, high rigidity, high torsion resistance and other excellent mechanical performance, excellent fatigue resistance and light weight, and is a very ideal structural steel material. At the same time, the present invention adopts full-automatic welding technology and professional positioning fixtures, which can ensure accurate positioning between the two webs and two wing plates, consistent welding seam tracks, and easy realization of standardization. The welding seam is beautiful without spatter, and the product does not need to be reshaped after welding. The invention adopts the numerical control sliding forming technology and the rolling technology to process the web, which can realize the large-scale product. At the same time, the web processing technology matches the welding efficiency of industrial production, and large-scale industrial production can be realized.

Compared with hot-rolled I-shaped steel, H-shaped steel and welded H-shaped steel composite beam, the invention has significantly improved lateral rigidity and torsional bearing capacity, and saves steel consumption. Compared with the composite beam using hot-rolled I-shaped steel and H-shaped steel, the present invention has higher economic advantages because it can obtain higher anti-buckling bearing capacity and overall stable bearing capacity with thinner web thickness. Compared with the combined beam using hot-rolled I-beam and H-beam, the present invention can save about 40% to 60% of the steel consumption of the steel beam and about 30% compared with welded H-beam under the condition of similar rigidity and bearing capacity.

The present invention is based on following two facts:

1) The use of double webs to form a box-shaped section can greatly improve the stability and bearing capacity of the member, especially the torsional bearing capacity, compared with the single web member of the same height and material.

2) Compared with the flat steel plate, the corrugated steel plate has significantly improved shear bearing capacity and out-of-plane deformation resistance under the same thickness. Using it for steel beams for building structures can save a lot of steel on the premise of ensuring the shear bearing capacity.

Therefore, using corrugated steel plates as webs to form box sections and applying them to composite beams can give full play to the above two technical advantages at the same time. Compared with ordinary hot-rolled H-beams, I-beams, welded H-beams, and single Corrugated web H-shaped steel composite beams and other similar products have significantly improved mechanical properties, and the thickness of the flange and web can be reduced, so that the amount of steel can be greatly saved. This is in line with the overall goal of my country's sustainable development strategy .

The present invention has substantive advantages in the following aspects:

1) The present invention adopts special numerical control bending technology and numerical control roll forming technology to manufacture corrugated steel web 2 and web 3, which can reduce the wavelength, increase the corrugation density or increase the wave height at the place where the force is greater, and increase the corrugation density or increase the wave height. Sparse corrugations are used in the less stressed parts to realize the optimization along the beam length direction, so as to achieve the dual effects of improving bearing capacity and saving steel.

2) The present invention adopts numerical control bending technology and numerical control rolling technology in the production of corrugated steel plates to realize the enlargement of components, for example, large steel beams with a cross-sectional height of 3 to 4 meters can be produced.

3) The production of corrugated web 2 and web 3 adopts numerical control bending technology and numerical control rolling technology, so the residual deformation and local stretching produced are significantly lower than those of stamping or cold bending and rolling, so the performance is better , and the production efficiency is high.

4) The corrugated webs 2 and 3 used in the present invention have higher fatigue strength than flat webs, so they can be applied in some specific fields that require higher fatigue resistance of components, such as large industrial plants.

5) The present invention adopts a box-shaped section, which has higher torsional bearing capacity and overall stable bearing capacity, and can be applied to the structure as a main force-bearing member.

The present invention can be used as a substitute for traditional I-shaped steel and H-shaped steel composite beams, and is more widely used than I-shaped steel and H-shaped steel composite beams, and can realize large-scale components for special fields and special locations, including large-span industrial and civil uses Construction and construction of long-span bridges, etc.

Description of drawings

Fig. 1 is a three-dimensional diagram of the structure of the present invention.

Fig. 2 is a cross-sectional illustration of the present invention

Figure 3 is a longitudinal sectional view of the present invention.

Figure 4 is a schematic cross-sectional view of a trapezoidal corrugated web.

Fig. 5 is a schematic cross-sectional view of a sinusoidal corrugated web.

Numbers in the figure: 1 is the upper flange, 2 and 3 are the web, 4 is the lower flange, 5 is a profiled steel plate, 6 is a stud, 7 is a transverse steel bar, and 8 is a reinforced concrete wing.

Detailed ways

The present invention will be further described below by means of the structural drawings of the embodiments.

Example 1: The cross-section shape of the double corrugated web steel box composite girder is composed of the middle web 2, web 3, upper flange 1, and lower flange 4. The upper flange 1 is parallel to the lower flange 4. , the web 2 and the web 3 are perpendicular to the upper flange 1 and the lower flange 4, and the cross-sectional shape of the web 2 and 3 is trapezoidal. The reinforced concrete wing plate 8 is located above the profiled steel plate 5, the profiled steel plate 5 is located above the upper flange 1, the reinforced concrete wing plate 8, the profiled steel plate 5, and the upper flange 1 are fixed by the tack 6, and the transverse reinforcement 7 Welded on the profiled steel plate 5 tops.

In order to verify the performance of the device, a test piece was made for research. The steel materials in the test pieces are all made of Q235 steel, the thickness of the reinforced concrete wing plate 8 is 100 mm, and C20 concrete is used, the stud 6 is made of M19×100, and the profiled steel plate 5 is made of YX38-175-700. The thickness of the upper flange 1 and the lower flange 4 of the test piece is 10mm, the width is 150mm, the thickness of the web 2 is 2mm, the height is 500mm, the corrugation height is 38mm, the inclination angle of the inclined section is 58°, and the wavelength is 175mm. mm.

Claims (6)

1. double-ripple ventral shield steel case built-up beam, by top flange (1), web (2), web (3), bottom flange (4), profiled sheet (5) and steel concrete wing plate (8) connect and compose, its knot is characterised in that top flange (1) is parallel with bottom flange (4), web (2) and web (3) vertically are positioned at respectively between top flange (1) and bottom flange (4), the section of web (2) and web (3) all is the waveform that even or inhomogeneous periodicity repeats, this ripple section is the trapezoidal or sine curve of arc chord angle, and symmetry is placed, see figure (4) respectively, figure (5), steel concrete wing plate (8) is positioned at profiled sheet (5) top, profiled sheet (5) is positioned at top, top flange (1), steel concrete wing plate (8), profiled sheet (5), top flange (1) three is fixing by peg (6), peg (6) as shear connector with steel concrete wing plate (8), profiled sheet (5), girder steel top flange (1) connects into integral body, transverse reinforcement (7) is welded in profiled sheet (5) top, as the connector between profiled sheet (5) and the armored concrete slab (8).

2. double-ripple ventral shield steel case built-up beam according to claim 1, the inclination angle that it is characterized in that the trapezoidal oblique line section that described arc chord angle is trapezoidal is 30-90 °.

3. double-ripple ventral shield steel case built-up beam according to claim 1 is characterized in that being respectively the single face fillet weld between described web (2) and top flange (1) or bottom flange (4).

4. double-ripple ventral shield steel case built-up beam according to claim 1 is characterized in that being respectively the single face fillet weld between described web (3) and top flange (1) or bottom flange (4).

5. double-ripple ventral shield steel case built-up beam according to claim 1 is characterized in that the placement of described web (2) and web (3) symmetry, is cellular section structure.

6. double-ripple ventral shield steel case built-up beam according to claim 1 is characterized in that the bellows-shaped of described web (2) and web (3) adopts numerical control bending technology or numerical control roll-in technology to make.

Images