CN114892888A - A section steel-partially filled concrete composite beam and its construction method - Google Patents

Abstract

The invention discloses a profile steel-partially filled concrete composite beam and a construction method thereof. The composite beam includes a filling section, both ends of the filling section are connected with a non-filling section, the filling section includes a first section steel and filled concrete; the first section steel includes a first upper flange steel plate connected in sequence , the first web steel plate and the first lower flange steel plate, both ends of the first section steel are connected with a partition plate, and the concrete is poured on the first upper flange steel plate, the first web steel plate, the first lower flange plate In the space enclosed by the flange steel plate and the dividing plate. The profiled steel-partially filled concrete composite beam of the present invention, compared with the traditional steel beam, is filled with concrete in the profiled steel, which improves the vertical stiffness of the composite beam, and the floor has higher comfort under crowd load. The compressive bearing capacity of the concrete is significantly improved by providing three-way restraint for the concrete by the first section steel, while the concrete provides out-of-plane restraint for the first section steel plate, preventing the local buckling of the first section steel.

Description

A section steel-partially filled concrete composite beam and its construction method

technical field

The invention relates to a profile steel-partially filled concrete composite beam and a construction method thereof, belonging to the technical field of building construction.

Background technique

Section steel-concrete composite beam is a common form of steel-concrete composite beam, which is characterized in that the section steel is filled with concrete, the section steel plate is not prone to buckling, and the concrete is in a three-way stress state under the constraint of the section steel, compressive bearing capacity strength is improved. Therefore, the combination of profiled steel and concrete can effectively improve the bearing capacity, ductility and seismic capacity of structural beams, and is widely used in super high-rise and long-span building structures.

The prefabricated technology refers to the construction technology in which the structural components are prefabricated in the factory and spliced and installed on site. It has the advantages of fast construction speed, high construction quality, and less construction pollution. It has been vigorously promoted in my country in recent years.

However, the connection nodes between the profiled steel-concrete composite beam and the concrete column or steel column are relatively complex. When the prefabricated design or construction quality is not up to standard, the structural integrity is poor, and it is difficult to realize the design principle of "strong joints and weak components". The advantages of steel-concrete composite beams cannot be fully utilized.

Under the action of earthquake, the bending moment of the frame beam is antisymmetrically distributed, and the bending moment at both ends is much larger than the bending moment at the mid-span. It is uneconomical to make the whole frame beam into a single section. The beam end section steel-concrete composite section has high strength. If the column section has insufficient strength or stability, it is difficult to form the yield mechanism of "beam hinge", resulting in the reduction of structural ductility.

SUMMARY OF THE INVENTION

In order to overcome the deficiencies of the prior art, the present invention provides a profiled steel-partially filled concrete composite beam and a construction method thereof, which not only exerts the advantages of high bearing capacity and good seismic performance of the profiled steel-concrete composite beam, but also effectively avoids the need for profiled steel-concrete composite beams. The complex problem of joint connection of concrete composite beams is conducive to the implementation of prefabricated assembly.

The present invention is achieved through the following technical solutions:

A section steel-partially filled concrete composite beam, the composite beam includes a filling section, both ends of the filling section are connected with a non-filling section, and the filling section includes a first section steel and filled concrete; the first section steel It includes a first upper flange steel plate, a first web steel plate and a first lower flange steel plate, which are connected in sequence. Both ends of the first section steel are connected with a partition plate, and the concrete is poured on the first upper flange steel plate. , the first web steel plate, the first lower flange steel plate and the space enclosed by the partition plate.

In the profiled steel-partially filled concrete composite beam, the inner surface of the first upper flange steel plate, the first lower flange steel plate and the surface of the first web steel plate are all provided with shear studs.

The described one-section steel-partially filled concrete composite beam, one side of the filled concrete is provided with a structural steel mesh.

6@150双层布置。Described a kind of profiled steel-partially filled concrete composite beam, the structural steel mesh is:

6@150 double-layer arrangement.

For the profiled steel-partially filled concrete composite beam, the first profiled steel is preferably S3~S5 section, the out-of-plane buckling of the plate is restrained by the filled concrete, and the stability is good. Because the thickness of the plate is thin, the material is preferably Q355.

In the described section steel-partially filled concrete composite beam, the first web steel plate, the first upper flange steel plate and the first lower flange steel plate are connected by welding.

In the described section steel-partially filled concrete composite beam, there are multiple web steel plates, and the distance between the outer surface of the outermost web steel plate and the flange edge is not less than 100 mm. Two rows of shear studs are arranged on the outer surface of the outermost first web steel plate, and the longitudinal spacing of the shear studs is 200mm.

The described section steel-partially filled concrete composite beam is filled with foamed concrete, which reduces the self-weight of the structure.

In the described section steel-partially filled concrete composite beam, one side surface of the partition plate is flush with the edge of the first section steel of the filling section, and its three sides are respectively connected with the first upper flange steel plate, the first lower flange steel plate and the most The outer first web steel plate surface is welded and connected. The separator material is preferably Q355.

The described section steel-partially filled concrete composite beam, the non-filled section includes a second section steel, and the second section steel includes a second upper flange steel plate, a second web steel plate and a second lower flange that are connected in sequence steel plate.

In the one type of profiled steel-partially filled concrete composite beam, stiffeners are arranged in the section of the second profiled steel. The three sides of the stiffening rib are respectively welded and connected with the surfaces of the second upper flange steel plate, the second lower flange steel plate and the second web steel plate, and the spacing between the stiffening ribs is 200mm. The stiffener material is preferably Q355.

In the described section steel-partially filled concrete composite beam, the surfaces of the second upper flange steel plate and the second lower flange steel plate are weakened to form a dog-bone structure. The structure is easy to form the yielding mechanism of "beam hinge".

In the described section steel-partially filled concrete composite beam, the length of the non-filled section is 1 times the height of the composite beam.

In the described one section steel-partially filled concrete composite beam, the second section steel preferably has a section of S1~S2, which has high ductility under the action of reciprocation. The thickness of the plate is thicker, and its material is preferably Q345GJ.

The described construction method of a profiled steel-partially filled concrete composite beam, firstly, the first upper flange steel plate, the first web steel plate and the first lower flange steel plate are welded to obtain the first shaped steel. Weld the dividing plate; then pour concrete into the space enclosed by the first upper flange steel plate, the first web steel plate, the first lower flange steel plate and the dividing plate; finally weld the non-filling section to both ends of the filling section Get a composite beam.

Said construction method of a profiled steel-partially filled concrete composite beam, the concrete steps of pouring concrete are as follows: turn one side of the first web steel plate upward, and place the first upper flange steel plate, the first web steel plate, the first Concrete is poured in the space enclosed by the flange steel plate and the partition plate. After the foam concrete is solidified and hardened, the filling section is turned over so that the other side of the first web steel plate is facing upward, and the concrete is poured in the same way.

In the construction method of the profiled steel-partially filled concrete composite beam, the construction of the profiled steel-partially filled concrete composite beam is completed in the factory to realize prefabrication and assembly.

A method for connecting a section steel-partially filled concrete composite beam and a structural column. Section Steel - Partially filled concrete composite beams are connected to the structural columns by a second section steel of the non-filled section. The connection method can be welded, bolted or bolted combined connection.

Under the action of vertical constant live load, the section steel-partially filled concrete composite beam is in an elastic working state. Since the composite beam is filled with concrete in the middle span, its vertical stiffness is much greater than that of traditional steel beams, and the floor comfort is better. When subjected to seismic action, the bending moment of the composite beam is mainly distributed at the beam end. Due to the "dog-bone" structure, the beam end can quickly form a "beam comparison" and enter a state of yield energy dissipation. The S1~S2 section is selected for the non-filled section, which can enter the full-section plasticity and has strong seismic performance. The stiffener of the non-filled section can further improve its shear resistance and local stability.

Beneficial effects achieved by the present invention:

Compared with the traditional steel beam, the profiled steel-partially filled concrete composite beam of the present invention is filled with concrete in the profiled steel, which improves the vertical stiffness of the composite beam and provides a higher level of comfort for the floor under crowd load. The compressive bearing capacity of the concrete is significantly improved by providing three-way restraint for the concrete by the first section steel, and the concrete provides out-of-plane restraint for the first section steel plate, preventing the local buckling of the first section steel. At the same time, the concrete material has good fire resistance, and filling the first section steel with concrete can make up for the shortcoming of the steel beam's poor fire resistance and improve the fire resistance of the composite beam.

In the type steel-partially filled concrete composite beam of the present invention, the first shaped steel is filled with light-weight foam concrete, which reduces the self-weight of the composite beam without affecting its mechanical performance. Shear studs are arranged in the first section steel, which improves the adhesion and shear resistance between the filled concrete and the first section steel. Set up structural steel mesh in the filled concrete to prevent spalling of the surface concrete.

The profiled steel-partially filled concrete composite beam of the present invention adopts S1~S2 section at the end of the profiled steel-partially filled concrete composite beam, which can achieve full cross-section plasticity and improve the energy dissipation capacity of the composite beam under earthquake action. Stiffeners are arranged in the section steel at the end of the composite beam, which constrains the out-of-plane deformation of the section steel plate and further improves its rotational ductility. At the same time, the end of the composite beam is made of second section steel. Compared with the traditional section steel-concrete composite beam, the connection structure is simpler and the construction difficulty is lower. The end of the composite beam adopts a "dog-bone" structure, which can quickly form a "beam hinge" under the action of an earthquake, forming a yielding mechanism of "strong column and weak beam".

The inventive type steel-partially filled concrete composite beam can be prefabricated in a factory as a whole, and industrialized production can be realized.

Description of drawings

FIG. 1 is a front view of Embodiment 1. FIG.

FIG. 2 is a sectional view taken along line 1-1 of FIG. 1 .

FIG. 3 is a sectional view taken along line 2-2 of FIG. 1 .

FIG. 4 is a cross-sectional view taken along line 3-3 of FIG. 1 .

FIG. 5 is a front view of the second embodiment.

FIG. 6 is a cross-sectional view taken along line 1-1 of FIG. 5 .

FIG. 7 is a cross-sectional view taken along line 2-2 of FIG. 5 .

FIG. 8 is a cross-sectional view taken along line 3-3 of FIG. 5 .

In the figure: 1. Filled section; 2. Non-filled section; 3. First section steel; 4. First upper flange steel plate; 5. First lower flange steel plate; 6. First web steel plate; 7. Concrete; 8. Separation plate; 9. Shear stud; 10. Structural steel mesh; 11. Second section steel; 12. Second upper flange steel plate; 13. Second lower flange steel plate; 14. Second web steel plate ; 15, stiffeners.

Detailed ways

The present invention is further described below. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

Example 1

As shown in Figure 1-4.

This embodiment provides a profiled steel-partially filled concrete composite beam. The composite beam contains one filled segment 1 and two unfilled segments 2. Filled section 1 includes first section steel 3 , concrete 7 , partition plate 8 , shear studs 9 and construction steel mesh 10 ; non-filled section 2 includes second section steel 11 and stiffeners 15 .

The first section steel 3 of the filling section 1 is composed of a first upper flange steel plate 4, a first lower flange steel plate 5 and a first web steel plate 6, of which the first web steel plate 6 is made of one piece, and the section of the first section steel 3 is Type H. Partition plates 8 are provided at both ends of the first section steel 3 , and concrete 7 is poured into the space enclosed by the first upper flange steel plate 4 , the first lower flange steel plate 5 , the first web plate 6 and the partition plate 8 . The inner surfaces of the first upper flange steel plate 4 , the first lower flange steel plate 5 and the surface of the first web steel plate 6 are provided with shear studs 9 for reliable connection between the concrete 7 and the first shaped steel 3 . A structural steel mesh 10 is provided on the side of the concrete 7 not in contact with the first section steel 3 to prevent the outer concrete from peeling off under vertical load or horizontal reciprocating load.

The second section steel 11 of the non-filling section 2 is composed of a second upper flange steel plate 12 , a second lower flange steel plate 13 and a second web steel plate 14 . Stiffeners 15 are arranged in the second section steel 11 to improve the shear resistance of the non-filled section 2, restrain the buckling of the plate, and improve the ductility under reciprocating actions such as earthquakes.

In this embodiment, the first section steel 3 of the filling section 1 is of S3-S5 section, the out-of-plane buckling of the panel is constrained by the concrete 7, and the stability is good. Due to the thin thickness of the plate, its material is Q355.

In this embodiment, the first web steel plate 6 of the filling section 1 and the first upper flange steel plate 4 and the first lower flange steel plate 5 are connected by welding.

In this embodiment, a row of shear studs 9 is arranged on the inner surfaces of the outriggers of the first upper flange steel plate 4 and the first lower flange steel plate 5, and two rows of shear studs are arranged on the outer surface of the first web steel plate 9. The longitudinal spacing of shear studs 9 is 200mm.

In this embodiment, the filled concrete 7 is made of foamed concrete, which reduces the weight of the structure.

6@150双层布置，构造钢筋网10边缘距离填充混凝土7表面的距离（保护层厚度）为35mm，构造钢筋网10与型钢I3焊接。In this embodiment, the steel mesh 10 is constructed as

6@150 double-layer arrangement, the distance between the edge of the structural steel mesh 10 and the surface of the filled concrete 7 (the thickness of the protective layer) is 35mm, and the structural steel mesh 10 is welded with the section steel I3.

In this embodiment, one side surface of the partition plate 8 is flush with the edge of the first section steel 3 of the filling section 1, and its three sides are respectively the first upper flange steel plate 4, the first lower flange steel plate 5 and the first web The surface of the plate steel plate 6 is welded and connected. The material of the partition plate 8 is Q355.

In this embodiment, the second section steel 11 of the non-filled section 2 is of S1-S2 section, and has high ductility under the action of reciprocation. The thickness of the plate is thicker, and its material is Q345GJ.

In this embodiment, the second web steel plate 14 and the second upper flange steel plate 12 and the second lower flange steel plate 13 are connected by welding.

In this embodiment, the length of the unfilled section 2 is 1 times the beam height.

In this embodiment, the second section steel 11 and the first section steel 3 have the same cross-sectional shape, only the thickness of the plate is different, and the second section steel 11 and the first section steel 3 are connected by welding butt joint.

In this embodiment, the three sides of the stiffening ribs 15 are respectively welded and connected to the surfaces of the second upper flange steel plate 12 , the second lower flange steel plate 13 and the second web steel plate 14 , and the spacing between the stiffening ribs 14 is 200 mm. The material of the stiffener 14 is Q355.

In this embodiment, the second upper flange steel plate 12 and the second lower flange steel plate 13 of the non-filled section 2 are weakened to form a "dog-bone" structure, and the structure is easy to form a "beam hinge" yield mechanism.

This embodiment provides a construction method for a profiled steel-partially filled concrete composite beam. First, the first upper flange steel plate 4 , the first lower flange steel plate 5 and the first web steel plate 6 of the filling section 1 are welded to form the first section steel 3 . Partition plates 8 are welded to both ends of the first section steel 3 , and shear bolts 9 are welded to the surfaces of the first upper flange steel plate 4 , the first lower flange steel plate 5 and the first web steel plate 6 . With one side of the first web steel plate 6 facing upwards, pour concrete 7 in the space enclosed by the first upper flange steel plate 4, the first lower flange steel plate 5, the first web steel plate 6 and the partition plate 8, After the concrete 7 is solidified and hardened, the filling section 1 is turned over so that the other side faces upward, and the concrete 7 is poured in the same way. Then, the second upper flange steel plate 12 , the second lower flange steel plate 13 and the second web steel plate of the unfilled section 2 are welded 14 to form the second section steel 11 , and the stiffening ribs 15 are welded and installed. Finally, the non-filled section 2 is welded to the two ends of the filled section 1 to obtain a complete section steel-partially filled concrete composite beam.

In this embodiment, the construction of the profiled steel-partially filled concrete composite beam is completed in the factory to realize prefabrication and assembly.

In this embodiment, the profiled steel-partially filled concrete composite beam is connected to the structural column through the second profiled steel 11 of the unfilled section 2 . The connection method can be welded, bolted or bolted combined connection.

Example 2

As shown in Figure 5-Figure 8.

This embodiment provides a profiled steel-partially filled concrete composite beam. The difference from the first embodiment is that there are two first web steel plates 6 , the section of the first section steel 3 is a box section with an overhanging flange, and the outer surface of the first web steel plate 6 is separated from the first upper flange steel plate 4 . The distance from the edge of the first lower flange steel plate 5 is not less than 100mm.

The working principle of the present invention is as follows:

Under the action of vertical constant live load, the profiled steel-partially filled concrete composite beam is in an elastic working state. Since the composite beam is filled with concrete 7 in the middle span, its vertical stiffness is much greater than that of traditional steel beams, and the floor comfort is better. When subjected to seismic action, the bending moment of the composite beam is mainly distributed at the beam end. Because the non-filled section 2 adopts a "dog-bone" structure, the beam end can quickly form a "beam ratio" and enter a state of yield energy dissipation. The non-filled section 2 uses S1~S2 sections, which can enter the full-section plasticity and have strong seismic performance. The stiffener 15 of the non-filled section 2 can further improve its shear resistance and local stability.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principle of the present invention, several improvements and modifications can also be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.

Claims (10)

1. A profiled steel-partially filled concrete composite beam, characterized in that the composite beam comprises a filling section, both ends of the filling section are connected with a non-filling section, and the filling section comprises a first section steel and filled concrete The first section steel includes a first upper flange steel plate, a first web steel plate and a first lower flange steel plate that are connected in sequence, and both ends of the first section steel are connected with a partition plate, and the concrete is poured in The space enclosed by the first upper flange steel plate, the first web steel plate, the first lower flange steel plate and the partition plate. 2. A profiled steel-partially filled concrete composite beam according to claim 1, wherein the inner surface of the first upper flange steel plate, the first lower flange steel plate and the surface of the first web steel plate are all uniform. Provided with shear studs. 3 . The profiled steel-partially filled concrete composite beam according to claim 1 , wherein one side of the filled concrete is provided with a structural steel mesh. 4 . 4. a kind of profiled steel-partially filled concrete composite beam according to claim 3 is characterized in that, the structural steel mesh is

6@150 double-layer arrangement. 5 . The profiled steel-partially filled concrete composite beam according to claim 1 , wherein the non-filled section comprises a second profiled steel, and the second profiled steel comprises a second upper flange steel plate, a first Second web steel plate and second lower flange steel plate. 6 . The profiled steel-partially filled concrete composite beam according to claim 5 , wherein a stiffening rib is provided in the section of the second profiled steel. 7 . 7. A profiled steel-partially filled concrete composite beam according to claim 5 or 6, wherein the surfaces of the second upper flange steel plate and the second lower flange steel plate are weakened to form a dog-bone structure. 8 . The profiled steel-partially filled concrete composite beam according to claim 1 , wherein the length of the non-filled section is 1 times the height of the composite beam. 9 . 9. The construction method of a profiled steel-partially filled concrete composite beam according to any one of claims 1-8, wherein firstly the first upper flange steel plate, the first web steel plate and the first lower Flange steel plates are welded to obtain the first section steel, and partition plates are welded at both ends of the first section steel; then to the space enclosed by the first upper flange steel plate, the first web plate, the first lower flange steel plate and the partition Concrete is poured inside; finally, the unfilled section is welded to both ends of the filled section to obtain a composite beam. 10. The construction method of a profiled steel-partially filled concrete composite beam according to claim 9, wherein the concrete step of pouring the concrete is as follows: the first web steel plate is facing upwards, and the first upper Concrete is poured in the space enclosed by the flange steel plate, the first web steel plate, the first lower flange steel plate and the partition plate. After the foam concrete is solidified and hardened, the filling section is turned over so that the other side of the first web steel plate faces upwards. , pour the concrete in the same way.

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