CN219952446U

CN219952446U - Steel-UHPC composite beam

Info

Publication number: CN219952446U
Application number: CN202321400241.6U
Authority: CN
Inventors: 杲晓龙; 丁昊; 赵银海
Original assignee: Zhejiang Hongzhi Tai Nike New Mstar Technology Ltd
Current assignee: Zhejiang Hongzhi Tai Nike New Mstar Technology Ltd
Priority date: 2023-06-05
Filing date: 2023-06-05
Publication date: 2023-11-03
Anticipated expiration: 2033-06-05

Abstract

The utility model relates to the technical field of structural engineering, in particular to a steel-UHPC composite beam. The composite beam comprises a steel beam and an outer UHPC layer; the steel beam includes: honeycomb steel web and lower flange steel plate; the outsourced UHPC layer comprises: UHPC web and lower flange UHPC board; the UHPC web comprises first UHPC panels arranged on two sides of the honeycomb-shaped steel web, and the first UHPC panels on two sides form a connected integrated structure through honeycomb holes of the honeycomb-shaped steel web; the lower flange UHPC plate comprises second UHPC panels arranged on the upper side and the lower side of the lower flange steel plate, the two sides of the second UHPC panels in the width direction exceed the lower flange steel plate, and the second UHPC panels on the two sides are connected through the exceeding parts of the second UHPC panels to form an integrated structure; wherein the UHPC web and the lower flange UHPC plate are integrally formed by one casting. The utility model combines the advantages of UHPC and steel, and provides a combined beam structure which has high bearing capacity, high rigidity and small dead weight, can be industrially produced and can be connected by bolts.

Description

Steel-UHPC composite beam

Technical Field

The utility model relates to the technical field of structural engineering, in particular to a steel-UHPC composite beam.

Background

The steel-concrete composite beam is a structural form of building components, combines the advantages of steel and concrete, has the characteristics of high strength, high rigidity, good durability and the like, and is widely used in projects such as large-span, high-rise buildings, bridges and the like.

Conventional steel-concrete composite beams are typically composed of steel beams for carrying loads and providing rigidity, and concrete slabs for increasing load carrying capacity and providing fire protection. The steel beam and the concrete slab are tightly connected together through connecting pieces (such as shear connection, lap joint connection and the like) to form a whole.

However, the conventional steel-concrete composite beam has disadvantages: a large number of connecting pieces (such as studs) are needed to connect the steel beam and the concrete slab, the drawing resistance effect of the studs is poor, concrete in a hogging moment area is easy to crack, and the durability of the structure is not good; in order to reduce the problems of cracking and insufficient rigidity of the beams in the span structure, prestressing force is required to be applied to the combined beams, but the traditional prestressing force technology requires on-site stretching prestressing force, and the construction process is complex; in order to adapt to the continuous increase of high-rise, super high-rise and large-span space structures, the cross section size of the components is required to be increased continuously to meet the requirements, so that the dead weight and the size of the components are increased continuously.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model aims to provide the steel-UHPC composite beam, which combines the advantages of the ultra-high performance of UHPC and steel, improves the bearing capacity, the fireproof and corrosion-resistant performance and the durability of the composite beam, does not need a connecting piece to combine the steel and the UHPC, and has the advantages of high bearing capacity, high rigidity, small cross section size of a component, small dead weight, simple construction and the like.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

a steel-UHPC composite beam comprises a steel beam and an outer UHPC layer; the steel beam comprises a honeycomb steel web and a lower flange steel plate, and the lower flange steel plate is vertically connected with the honeycomb steel web; the outsourced UHPC layer comprises: the UHPC web comprises first UHPC panels arranged on two sides of the honeycomb steel web, and the first UHPC panels on two sides form a connected integrated structure through honeycomb holes of the honeycomb steel web; the lower flange UHPC plate comprises second UHPC panels which are arranged on the upper side and the lower side of the lower flange steel plate, the two sides of the second UHPC panels in the width direction exceed the lower flange steel plate, and the second UHPC panels on the two sides are connected through the exceeding parts of the second UHPC panels to form an integrated structure; wherein the UHPC web and the lower flange UHPC plate are integrally formed by one casting.

Further, the composite beam further comprises an upper flange UHPC plate, and the upper flange UHPC plate, the UHPC web plate and the lower flange UHPC plate are integrally formed through one-time pouring.

Further, the upper portion of the honeycomb section steel web extends into the upper flange UHPC plate.

Further, the honeycomb holes of the honeycomb-shaped steel web plate adopt a hexagonal structure.

Furthermore, the upper flange UHPC board can be internally provided with or not provided with reinforcing bars; in the general case, the upper flange UHPC board is not required to be provided with reinforcing bars, and the reinforcing bars can be arranged when the upper flange UHPC board is required to be provided through calculation.

Further, the lower flange UHPC plate exceeds the lower flange steel plate by at least 2cm on both sides in the width direction.

Further, the width of the UHPC web is determined by the construction requirements of the design specification and the requirements of the fire protection design specification.

Further, the length of the portion of the honeycomb-shaped steel web extending into the upper flange UHPC plate is at least half the thickness of the upper flange UHPC plate.

The beneficial effects of the utility model are as follows:

(1) The holes of the honeycomb steel web form natural shear connectors, so that UHPC panels on two sides of the steel web are connected into a whole, the bonding performance of the steel web and the UHPC web can be enhanced, the steel web and the UHPC web form a whole to work together, and the cost and the labor hour for additionally welding shear studs are reduced; on the other hand, by perforating the steel web, the steel consumption is saved under the condition of similar bearing capacity;

(2) Compared with the traditional concrete, the UHPC material is adopted, so that the dead weight of the combined beam can be obviously reduced under the condition of keeping similar bearing capacity, the structural load is reduced, the material cost is saved, and the supporting structure can be less influenced;

(3) The UHPC panel is wrapped with the steel web plate and the lower flange steel plate, and provides better fireproof performance and corrosion resistance for the composite beam, so that the service life of the composite beam is prolonged;

(4) The combined design of the steel beam and the UHPC can effectively bear load, and the high strength and rigidity of the UHPC further increase the overall performance of the beam;

(5) The prestress design is not needed, and the construction process is simplified; and the design of the UHPC outside the steel beam is relatively simple, the construction process is relatively convenient, the construction time can be shortened, and the construction efficiency is improved.

In summary, the technical scheme of the utility model combines the advantages of steel and UHPC, and provides higher strength, better fireproof performance, smaller dead weight, longer service life and simpler construction through the combination of the honeycomb web and the UHPC, so that the steel-UHPC composite beam has wider application prospect in large-span, high-rise building and other structural engineering.

Drawings

FIG. 1 illustrates a schematic structural view of a steel-UHPC composite beam, in accordance with some embodiments of the present utility model;

FIG. 2 illustrates a side view of a composite beam, according to some embodiments of the utility model;

FIG. 3 illustrates a cross-sectional view taken along the A-A direction in FIG. 2, in accordance with some embodiments of the present utility model;

FIG. 4 illustrates a cross-sectional view in the direction B-B of FIG. 2, according to some embodiments of the utility model;

FIG. 5 illustrates a schematic view of a steel beam structure, according to some embodiments of the utility model;

FIGS. 6-7 illustrate a comparison of honeycomb steel webs with solid steel webs, according to some embodiments of the utility model;

FIG. 8 illustrates a process flow diagram of a hexagonal honeycomb web, according to some embodiments of the utility model;

fig. 9 shows a schematic view of a steel-UHPC composite beam with top flange steel plates, according to some embodiments of the utility model.

Description of the embodiments

The technical features and advantages of the present utility model are described in more detail below with reference to the accompanying drawings so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, and thus the scope of the present utility model is more clearly and clearly defined.

It should be noted that, in the description of the present utility model, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

The terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying an importance of the illustrated technical features.

Furthermore, it should be noted that, in the description of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.

The embodiment of the utility model provides a composite beam structure of a building member, which combines the advantages of steel and UHPC, and compared with the traditional steel-concrete composite beam, the composite beam has higher strength, better fireproof performance, smaller dead weight and section and longer service life, meanwhile, the composite beam does not need to use a connecting piece to connect the steel and the UHPC, and the composite beam does not need to be subjected to prestress design, thereby greatly simplifying the structure and construction process, shortening working hours and having wide application prospect in the field of structural engineering.

Please refer to fig. 1-4, which are schematic structural diagrams of the steel-UHPC composite beam according to the present embodiment. It comprises the following steps: the steel beam 100 and the outer UHPC layer 200 are arranged in the center of the composite beam, and the steel beam 100 is mainly used for providing rigid support for the composite beam; the UHPC layer 200 is coated on the periphery of the steel beam 100 to provide fireproof and corrosion resistance for the composite beam, and the rigidity and strength of the composite beam are further improved based on the ultra-high performance of UHPC. Based on the ultra-strong excellent performance of UHPC, compared with the traditional steel-concrete composite beam under the condition of keeping similar bearing, the steel-UHPC composite beam has lower dead weight, smaller section and simpler structure.

Referring to fig. 5, a structural diagram of a steel beam 100 according to the present embodiment includes a honeycomb steel web 110 and a lower flange steel plate 120, where the honeycomb steel web 110 and the lower flange steel plate 120 are vertically connected to form a T-shaped cross-section structure.

Referring to fig. 6, the honeycomb-shaped steel web 110 is used as a main bending-resistant component of the steel beam 100, and by forming the honeycomb holes 111 therein, the steel consumption can be saved by more than 25% compared with a solid steel web 110' under the condition of the same beam height H and thickness.

Referring to FIG. 7, in the case of the same amount of steel, the honeycomb-shaped steel web 110 has the honeycomb holes 111, and the height H of the beam is smaller than that of the solid steel web 110 ₁ Higher, i.e. the same steel usage, H ₁ ＞H ₂ (the web thickness is the same) so that the load carrying capacity of the beam is improved.

The honeycomb-shaped steel web 110 in this embodiment may have any open-cell structure such as round holes, oval holes, square holes, etc. the honeycomb holes 111 are preferably designed as hexagonal holes, so as to minimize the loss of steel through the construction process. Referring to fig. 8 (a) -8 (c), a solid steel plate 110 'is cut by a toothed cutting line 111' to form an upper half 110a 'and a lower half 110b', and the two halves 110a ', 110b' are spliced in a staggered manner to form a honeycomb steel web 110 with hexagonal honeycomb holes, and in theory, zero loss of steel can be achieved through the above process.

Referring to fig. 3-4, a sectional view of the composite beam in A-A direction and B-B direction of the present embodiment is shown, wherein A-A corresponds to a section of the steel beam 100 with honeycomb holes.

The outer UHPC layer 200 comprises structurally: the UHPC web 210 and the lower flange UHPC board 220, wherein the UHPC web 210 further includes first UHPC panels 211 disposed on two sides of the honeycomb-type steel web 110, and the two first UHPC panels 211 are attached to two sides of the honeycomb-type steel web 110 in the length direction, so as to strengthen and protect the honeycomb-type steel web 110. The traditional steel-concrete composite beam is connected at the joint of the concrete and the steel beam through a large number of bolts, and the welding of the shear bolts consumes a large amount of time and economic cost. In this embodiment, referring to fig. 3, by designing the steel web plate into a honeycomb structure, the first UHPC panels 211 on two sides of the honeycomb steel web plate 110 are integrally connected through the honeycomb holes 111, and the honeycomb holes 111 form natural shearing connectors, so that the first UHPC panels 211 on two sides are tightly attached to two sides of the honeycomb steel web plate 110 and form a whole, thereby omitting the use of bolts, greatly shortening the processing time and saving the material cost.

The lower flange UHPC board 220 includes second UHPC panels 221 respectively provided at the upper and lower sides of the lower flange steel board 120, the second UHPC panels 221 extend beyond the lower flange steel board 120 at both sides in the width direction, and the extending portions connect the second UHPC panels 221 at both upper and lower sides to form a unit, so that the bonding between the lower flange steel board 120 and the lower flange UHPC board 220 does not need any connector structure; in addition, the lower flange UHPC plate 220 forms an enclosure structure for the lower flange steel plate 110, so that the lower flange of the composite beam has sufficient fireproof and corrosion-proof properties to protect the steel beam from corrosion and attack.

In some embodiments, referring to fig. 3-4, the composite beam of the present embodiment further includes: the upper flange UHPC plate 230, the upper end of the honeycomb-shaped steel web 110 extends into the upper flange UHPC plate 230 to strengthen the connection strength of the web to the upper flange UHPC plate 230. The upper flange UHPC plate 230, the UHPC web 210, and the lower flange UHPC plate 220 are integrally cast by UHPC. Preferably, in order to enhance the load bearing capacity of the upper flange UHPC board 230, the reinforcing bars 300 may be disposed therein, and the reinforcing bars 300 may be disposed along the length of the upper flange UHPC board 230 or along both the length and width directions.

Compared with the traditional steel-concrete composite beam, the steel-UHPC composite beam of the embodiment can omit the use of an upper flange steel plate, and can save more than 50% of steel use amount under similar bearing conditions by combining a steel web structure with honeycomb type holes.

It should be noted that, in some embodiments, referring to fig. 9, when the load of the composite beam is large, the steel beam 100 may be provided with the upper flange steel plate 130, but since the outer layer of UHPC 200 and the honeycomb steel web 110 can provide most of the load, the width of the upper flange steel plate 130 may be made narrower, and the upper flange UHPC plate 230 may not need to be provided with reinforcement bars.

In this embodiment, referring to fig. 4, the thickness D of the UHPC web 210 is calculated and determined according to the structural requirement of the design specification and the requirement of the fireproof design specification, and in order to ensure the connection strength between the honeycomb-type steel web 110 and the UHPC web 210, the porosity of the honeycomb-type web 110 may be set to about 50%; in order to ensure the connection strength of the lower flange steel plate 120 and the lower flange UHPC plate 220, the width d of the lower flange UHPC plate 220, which exceeds the lower flange steel plate 120, is more than or equal to 2cm; in addition, the length h of the honeycomb-shaped steel web 110 extending into the upper flange UHPC plate 230 is at least half the thickness of the upper flange UHPC plate 230 to fully secure the connection strength and bearing capacity.

The steel-UHPC composite beam of the embodiment can be formed by semi-automatic welding of the steel beam 100, the outer UHPC layer 200 is formed by integral casting, the outer UHPC layer 200 is arranged on the periphery of the steel beam 100 and forms an integrated component tightly combined with the steel beam 100, and the steel-UHPC composite beam has good bearing capacity and fireproof and anticorrosion performance, and meanwhile has the advantages of simple structure, small dead weight, simple and convenient construction process and good application prospect in the field of construction.

In the description of the present specification, reference to the terms "some implementations," "some embodiments," "exemplary," "example," "preferred," or "further" etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.

Claims

1. A steel-UHPC composite beam, characterized by comprising a steel beam (100) and an outer UHPC layer (200);

the steel beam (100) comprises:

a honeycomb steel web (110):

a lower flange steel plate (120), wherein the lower flange steel plate (120) is vertically connected with the honeycomb steel web (110);

the outsourced UHPC layer (200) comprises:

-a UHPC web (210), said UHPC web (210) comprising first UHPC panels (211) arranged on both sides of said honeycomb-shaped steel web (110), the first UHPC panels (211) on both sides forming a connected unitary structure through the honeycomb holes (111) of said honeycomb-shaped steel web (110);

a lower flange UHPC board (220), the lower flange UHPC board (220) including second UHPC panels (221) arranged on upper and lower sides of the lower flange steel board (120), the second UHPC panels (221) extending beyond the lower flange steel board (120) on both sides in a width direction, the second UHPC panels (221) on both sides being connected by an extending portion thereof to form an integral structure; wherein the UHPC web (210) and the lower flange UHPC plate (220) are formed as a single piece by one casting.

2. The steel-UHPC composite beam according to claim 1, further comprising an upper flange UHPC plate (230), the upper flange UHPC plate (230) being integral with the UHPC web (210) and the lower flange UHPC plate (220) by one casting.

3. The steel-UHPC composite beam according to claim 2, characterized in that the upper portion of the honeycomb steel web (110) extends into the upper flange UHPC plate (230).

4. The steel-UHPC composite beam according to claim 1, characterized in that the honeycomb holes (111) of the honeycomb steel web (110) are of hexagonal structure.

5. A steel-UHPC composite beam according to claim 2 or 3, characterized in that the upper flange UHPC plate (230) may or may not be provided with reinforcing bars (300).

6. The steel-UHPC composite beam according to claim 1, characterized in that the lower flange UHPC plate (220) extends beyond the lower flange steel plate (120) by at least 2cm on both sides in the width direction.

7. A steel-UHPC composite beam according to claim 3, characterized in that the portion of the honeycomb steel web (110) extending into the upper flange UHPC plate (230) has a length of at least half the thickness of the upper flange UHPC plate (230).