CN114673073A - A chord structure and system for steel truss-concrete composite structure - Google Patents

Abstract

The invention discloses a chord structure and a system for a steel truss-concrete composite structure, belonging to the technical field of bridge engineering, comprising a lower flange plate, a plurality of upper flange plates, and a plurality of the upper flange plates. The same web, a plurality of PBL shear key components, a plurality of first shear nails are fixed on the lower flange plate; a plurality of second shear nails are fixed on the upper flange plate; The web includes a lower end, a middle section and an upper end, each of the webs is fixedly connected by the lower end and the lower flange plate, and the web is fixed by the upper end and a corresponding one of the upper flange plates connected, the lower end is perpendicular to the lower flange plate, the upper end is perpendicular to the upper flange plate, and a plurality of the PBL shear key components respectively penetrate through each of the middle sections, so that each The intermediate sections are connected by PBL shear key components. The invention achieves the technical effects that the bonding ability between the steel and the concrete can be improved, the construction is convenient, and the quality is easy to guarantee.

Description

A chord structure and system for steel truss-concrete composite structure

technical field

The invention belongs to the technical field of bridge engineering, and particularly relates to a chord structure and a system for a steel truss-concrete composite structure.

Background technique

Steel and concrete composite structure is a structure in which steel parts and concrete or reinforced concrete parts are combined into a whole and work together, and it has some characteristics of steel structure and reinforced concrete structure. At present, there are two main ways for the chord structure of the steel truss-concrete composite structure: the first way is the traditional chord structure of the steel truss girder, which is generally a box-shaped section, and the shear nails are set on the upper flange plate. Combined with concrete; the second method is to use a box-shaped structure with openings on the top and side plates. The top and side plates are embedded in concrete, and steel bars are pierced in the openings of the steel plate to form a PBL shear bond to combine with the concrete. However, the amount of steel used in the first method is relatively large, which does not reflect the advantages of truss composite beams. If the concrete flange combined with the chord is thick, in order to meet the needs of shear resistance, the height of the shear nail generally needs to be higher than the neutral axis of the flange, so that the upper flange needs to be arranged with a shear nail with a larger height. This kind of shear nail needs to be customized or even welded or mechanically connected to lengthen, which is wasteful and inconvenient to construct. In addition, the height of the chord of the truss-web composite beam is smaller than that of the ordinary steel truss beam, the internal space is narrow, and the welding construction of the clapboard in the box chord is difficult. In the second method, the concrete pouring is difficult to compact. Although there are holes in the top plate and side plate, they are still closed sections, and holes are easily formed at the inner corners. In this way, the bonding ability between steel and concrete is poor, the construction is inconvenient, and the quality is not easy to guarantee.

To sum up, in the existing bridge engineering technology, there are technical problems such as poor bonding ability between steel and concrete, inconvenient construction, and difficult quality assurance.

SUMMARY OF THE INVENTION

The technical problems to be solved by the present invention are the technical problems of poor bonding ability between steel and concrete, inconvenient construction and difficult quality assurance.

In order to solve the above technical problems, the present invention provides a chord structure for a steel truss-concrete composite structure, comprising: a lower flange plate, a plurality of upper flange plates, and the same number as the plurality of upper flange plates The web, a plurality of PBL shear key components, a plurality of first shear nails are fixed on the lower flange plate; a plurality of second shear nails are fixed on the upper flange plate; the The web includes a lower end, a middle section and an upper end, each of the webs is fixedly connected to the lower flange plate through the lower end, and the web is fixedly connected to a corresponding upper flange plate through the upper end , the lower end is perpendicular to the lower flange plate, the upper end is perpendicular to the upper flange plate, and a plurality of the PBL shear key components respectively penetrate each of the middle sections, so that each The middle section is connected by the PBL shear key parts, a plurality of the PBL shear key parts are distributed along the length extension direction of the lower flange plate, the lower flange plate, the plurality of upper flange plates and all the The web forms a space for pouring the concrete structure.

Further, it also includes: a side plate, the side plate is connected with the lower flange plate, and the side plate and the lower flange plate are perpendicular.

Further, the plurality of upper flange plates include a first upper flange plate and a second upper flange plate; the webs having the same number as the plurality of upper flange plates include a first web plate and a second web plate , the first web includes a first lower end, a first middle section and a first upper end, the first middle section is provided with a plurality of first openings, the first lower end and the lower flange plate connection, the first upper end is connected with the first upper flange plate; the second web includes a second lower end, a second middle section and a second upper end, the second middle section is provided with a plurality of A second opening, the second lower end is connected to the lower flange plate, the second upper end is connected to the second upper flange plate, and the PBL shear key component penetrates the first opening and the lower flange plate. the corresponding second opening.

Further, a plurality of PBL shear key components are distributed at equal intervals, and the PBL shear key components include steel bars.

Further, the first upper flange plate and the first upper end are in an inverted L shape; the second upper flange plate and the second upper end are in an inverted L shape.

Further, the first upper flange plate and the first upper end are T-shaped; the second upper flange plate and the second upper end are T-shaped.

Further, the first upper end is fixed at the center of the first upper flange plate; the second upper end is fixed at the center of the second upper flange plate.

Further, the numerical range of the width of the lower flange plate is 800 mm to 2000 mm; the numerical range of the sum of the lengths of the lower end, the middle section and the upper end is 300 mm to 1000 mm.

Further, the width of the upper flange plate is less than half the width of the lower flange plate.

According to another aspect of the present invention, the present invention also provides a chord system for a steel truss-concrete composite structure, including a concrete structure, and the chord structure for a steel truss-concrete composite structure, the The concrete structure is cast in the space formed by the lower flange plate, the plurality of upper flange plates and the web plate.

Beneficial effects:

The present invention provides a chord structure for a steel truss-concrete composite structure. A plurality of first shear nails are fixed on the lower flange plate, and a plurality of second shear nails are fixed on the upper flange plate. Each web is fixedly connected to the lower flange plate through the lower end, the web is fixedly connected to the corresponding upper flange plate through the upper end, the lower end and the lower flange plate are perpendicular to each other, and multiple PBL shear key members respectively penetrate the middle sections of each web, so that each of the middle sections is connected by the PBL shear key members, a plurality of the PBL shear key members along the length of the lower flange plate distributed in the extension direction, the lower flange plate, the plurality of upper flange plates and the web form a space for pouring concrete structures. In this way, the lower flange plate can be used as the bottom form for concrete pouring, and the upper flange is two separate limbs, and the open section is convenient for concrete pouring, while increasing the shear resistance between steel and concrete. After the upper flange plate and the lower flange plate are connected by a web, a PBL shear key is formed by a plurality of PBL shear key components and the web, and is connected with a plurality of first shear nails and a plurality of second shear forces. The nails form a hybrid shear connection bond, which is beneficial to improve the connection performance between steel and concrete. In the chord steel structure, each web plate and a corresponding upper flange plate form an inverted π-shaped section on the lower flange plate. The inverted π-shaped section can provide sufficient stiffness and stability to meet the requirements of combining with concrete. The previous force requirements make the construction convenient. In turn, the bonding ability between steel and concrete can be improved, the construction is convenient, and the quality is easy to guarantee. Thus, the technical effect of improving the bonding ability between steel and concrete, convenient construction and easy quality assurance can be achieved.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the present invention. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic diagram 1 of a chord structure for a steel truss-concrete composite structure provided by an embodiment of the present invention;

FIG. 2 is a second schematic diagram of a chord structure for a steel truss-concrete composite structure provided by an embodiment of the present invention;

FIG. 3 is a schematic diagram 3 of a chord structure for a steel truss-concrete composite structure according to an embodiment of the present invention.

Detailed ways

The invention discloses a chord structure for a steel truss-concrete composite structure. By fixing a plurality of first shear nails 11 on the lower flange plate 1, and fixing a plurality of second shear nails on the upper flange plate Force Nail 23. Each web is fixedly connected to the lower flange plate 1 through the lower end, the web is fixedly connected to the corresponding upper flange plate through the upper end, and the lower end and the lower flange plate 1 are perpendicular to each other, A plurality of PBL shear key parts 4 respectively penetrate through the middle section of each web, so that each of the middle sections is connected by the PBL shear key parts 4, and the plurality of PBL shear key parts 4 are arranged along the lower part. The flange plate 1 is distributed along the extending direction of its length, and the lower flange plate 1 , a plurality of upper flange plates and the web form a space for pouring the concrete structure 5 . In this way, the lower flange plate 1 can be used as a bottom form for concrete pouring, and the upper flange is two separate limbs, and the open section is convenient for concrete pouring, and at the same time, the shear resistance between steel and concrete is increased. After the upper flange plate and the lower flange plate 1 are connected by a web, a PBL shear key is formed by a plurality of PBL shear key components 4 and the web, and is connected with a plurality of first shear nails 11 and a plurality of first shear bolts. The two shear nails 23 form a hybrid shear connection key, which is beneficial to improve the connection performance between steel and concrete. In the chord steel structure, each web plate and a corresponding upper flange plate form an inverted π-shaped section on the lower flange plate 1. The inverted π-shaped section can provide sufficient stiffness and stability to meet the requirements of concrete and concrete. Combined with the previous force requirements, the construction is convenient. In turn, the bonding ability between steel and concrete can be improved, the construction is convenient, and the quality is easy to guarantee. Thus, the technical effect of improving the bonding ability between steel and concrete, convenient construction and easy quality assurance can be achieved.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art fall within the protection scope of the present invention; wherein the keyword "and/or" involved in this implementation means and or both In other words, A and/or B mentioned in the embodiments of the present invention represent two situations of A and B, A or B, and describe the three states that A and B exist, such as A and/or B, means: only include A but not B; only include B but not A; include A and B.

It will be understood that, although the terms "first", "second", etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be subject to these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments. Spatially relative terms, such as "below", "above", etc., may be used herein to facilitate describing one element or feature's relationship to another element or feature. It will be understood that spatially relative terms encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. For example, if the device in the figures is turned over, elements or features described as "below" would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Meanwhile, in the embodiment of the present invention, when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a co-existence of an intervening component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a co-existing centered component. The terms "vertical", "horizontal", "left", "right" and similar expressions used in the embodiments of the present invention are only for the purpose of illustration and are not intended to limit the present invention.

Example 1

Please refer to FIG. 1, FIG. 2 and FIG. 3. FIG. 1 is a schematic diagram 1 of a chord structure for a steel truss-concrete composite structure provided by an embodiment of the present invention, and FIG. 2 is a schematic diagram of a chord structure provided by an embodiment of the present invention. Referring to the second schematic diagram of the chord structure of the steel truss-concrete composite structure, FIG. 3 is the third schematic diagram of the chord structure for the steel truss-concrete composite structure provided by the embodiment of the present invention. A chord structure for a steel truss-concrete composite structure provided by an embodiment of the present invention includes a lower flange plate 1, a plurality of upper flange plates, webs with the same number as the plurality of upper flange plates, A plurality of PBL shear key components 4, the lower flange plate 1, a plurality of upper flange plates, a plurality of webs with the same number as the plurality of upper flange plates, and a plurality of PBL shear key components 4 are described in detail. illustrate:

For lower flange plate 1 and multiple upper flange plates:

A plurality of first shear nails 11 are fixed on the lower flange plate 1 ; the width of the lower flange plate 1 ranges from 800 mm to 2000 mm. A plurality of second shear nails 23 are fixed on the upper flange plate; the width of the upper flange plate is less than half the width of the lower flange plate 1, as shown in FIG. 1 , The width of the first upper flange plate 21 may be b, then b<(1/2*L). The plurality of upper flange plates include a first upper flange plate 21 and a second upper flange plate 22 . Wherein, the first upper flange plate 21 and the first upper end 313 are in an inverted L shape; the second upper flange plate 22 and the second upper end 323 are in an inverted L shape. The first upper flange plate 21 and the first upper end 313 are T-shaped; the second upper flange plate 22 and the second upper end 323 are T-shaped. The first upper end 313 is fixed at the center of the first upper flange plate 21 ; the second upper end 323 is fixed at the center of the second upper flange plate 22 .

Specifically, the plurality of first shear nails 11 may refer to one first shear nail 11 , two first shear nails 11 , three first shear nails 11 , and the like. The first shear nail 11 may refer to a shear nail, which is used for penetration welding with the lower flange plate 1 . The first shear nail 11 and the lower flange plate 1 are perpendicular to each other. As shown in FIG. 1 , the width of the lower flange plate 1 refers to L, and 800mm≤L≤2000mm. Multiple upper flange plates may refer to 1 upper flange plate, 2 upper flange plates, 3 upper flange plates, etc. The upper flange plate may be perpendicular to the web, and the upper flange plate may not be The webs are perpendicular to each other. The upper flange plate and the web plate are fixedly connected, and the section after the upper flange plate and the web plate is connected can be T-shaped, or the section after the upper flange plate and the web plate can be connected can be an inverted L-shaped. When the connected section of the upper flange plate and the web is T-shaped, the web can be fixed at the center of the upper flange plate, and the lengths of the upper flange plate relative to both ends of the web are equal. Alternatively, the web can also be fixed off the center of the upper flange plate, in which case the length of the upper flange plate relative to the two ends of the web is not equal. The number of upper flange plates can be 2, and the two upper flange plates are the first upper flange plate 21 and the second upper flange plate 22, the first upper flange plate 21 and the second upper flange plate 22 respectively. Both can be parallel to the lower flange plate 1 .

For the same number of webs as a number of said upper flange plates:

The web includes a lower end, a middle section and an upper end, each of the webs is fixedly connected to the lower flange plate 1 through the lower end, and the web is fixed through the upper end and a corresponding upper flange plate connected, the lower end is perpendicular to the lower flange plate 1, the upper end is perpendicular to the upper flange plate, and the webs with the same number as the plurality of upper flange plates include a first web 31 and a The second web, the first web 31 includes a first lower end 311, a first middle section 312 and a first upper end 313, the first middle section 312 is provided with a plurality of first openings, the first The lower end 311 is connected to the lower flange plate 1, the first upper end 313 is connected to the first upper flange plate 21; the second web includes a second lower end 321, a second middle section 322 and The second upper end 323, the second middle section 322 is provided with a plurality of second openings, the second lower end 321 is connected to the lower flange plate 1, the second upper end 323 and the second upper The flange plate 22 is connected, and the PBL shear key member 4 penetrates the first opening and the corresponding second opening. Wherein, the value range of the sum of the lengths of the lower end, the middle section and the upper end is 300mm to 1000mm, that is, as shown in FIG. 1 , the overall length of the first web 31 may be h, 300mm≤h≤ 1000mm.

A plurality of the PBL shear key members 4 respectively penetrate through each of the middle sections, so that each of the middle sections is connected by the PBL shear key members 4, and a plurality of the PBL shear key members 4 are arranged along each of the middle sections. The length extension direction of the lower flange plate 1 is distributed, and the lower flange plate 1, a plurality of upper flange plates and the web form a space for pouring the concrete structure 5, and the concrete structure 5 is the concrete that needs to be poured. . A plurality of PBL shear key components 4 are distributed at equal intervals, and the PBL shear key components 4 include steel bars. As shown in Figure 1, the plurality of reinforcing bars may be distributed in parallel and at equal intervals, and the interval between each adjacent two reinforcing bars may be S, 100mm≤S≤300mm.

Specifically, the lower end, the middle section and the upper end can be integrally formed to form a web, the number of webs can be 2, and the 2 webs can be respectively the first web 31 and the second web, the first lower end 311, The first middle section 312 and the first upper end 313 can be integrally formed to form the first web 31 , and a plurality of first openings can be opened on the first middle section 312 of the first web 31 , and the first openings can be penetrated by steel bars. , to fix the steel bar on the first intermediate section 312 , so that the first web 31 is threaded through the steel bar to form a PBL shear key. Each steel bar penetrates one first opening and then penetrates the second opening of the second middle section 322 in the second web, and the first web 31 and the second web are connected by the steel bar to form a PBL shear key, Realize that the hybrid shear connection key is formed by the steel bar, the first web 31 and the second web, and a plurality of first shear nails 11 and a plurality of second shear nails 23, so as to be combined with the concrete structure 5 and arranged in a mixed manner The shear bond bonds can greatly enhance the shear resistance between the interfaces. Since the structures and principles of the second web and the first web 31 are the same, they will not be described here again.

A chord structure for a steel truss-concrete composite structure provided by an embodiment of the present invention further includes a side plate, the side plate is connected to the lower flange plate 1, and the side plate and the lower flange plate 1 phase is vertical.

Specifically, as shown in Figure 3, the side plate can be installed on the left side of the figure. After the side plate and the left end of the lower flange plate 1 are fixedly connected, the lower flange plate 1 acts as a bottom form for concrete pouring. To act as a side form to further facilitate construction.

In actual construction, for the bonding ability between steel and concrete, the difference between the truss web composite structure and the ordinary composite structure is that it has a large axial and shear concentrated force at the nodes. The shear connectors need to be centrally arranged at the nodes, and the connectors need to be deep above the neutral axis of the concrete flange to meet the shear requirements. The traditional steel truss chord structure is difficult to solve this problem structurally, and the stress requirement can only be met by increasing the number of shear nails at the nodes and increasing the height of the shear nails, which is inconvenient to manufacture and process. For the stress problem before and after the chord and the concrete flange are combined, before the chord and the concrete flange are combined, only the steel structure is stressed, which needs to meet the strength and stability requirements in the construction stage, and after the combination is combined as a composite structure. , the steel structure has the restraint of concrete and is difficult to destabilize, reflecting the advantages of the composite structure. Therefore, the structure of the chord needs to be balanced, which can not only meet the force in the construction stage, but also not be too strong and cause material waste. At present, the amount of steel used does not reflect the due advantages of the combined structure. For the convenience and quality of construction, the pouring and quality of concrete are the keys to success or failure. The present invention provides a chord structure for a steel truss-concrete composite structure. The steel structure can act as a formwork without affecting the flow of concrete. , to ensure that the concrete can be poured densely. The invention provides a chord structure for a steel truss-concrete composite structure, which has the advantages of simple structure, good mechanical properties, strong bonding ability between steel and concrete, convenient construction and good economy, and will have a wide range of applications in composite structures. prospect.

The present invention provides a chord structure for a steel truss-concrete composite structure, a chord structure for a steel truss-concrete composite structure, by fixing a plurality of first shear nails 11 on the lower flange plate 1 , a plurality of second shear nails 23 are fixed on the upper flange plate. Each web is fixedly connected to the lower flange plate 1 through the lower end, the web is fixedly connected to the corresponding upper flange plate through the upper end, and the lower end and the lower flange plate 1 are perpendicular to each other, A plurality of PBL shear key parts 4 respectively penetrate through the middle section of each web, so that each of the middle sections is connected by the PBL shear key parts 4, and the plurality of PBL shear key parts 4 are arranged along the lower part. The flange plate 1 is distributed along the extending direction of its length, and the lower flange plate 1 , a plurality of upper flange plates and the web form a space for pouring the concrete structure 5 . In this way, the lower flange plate 1 can be used as a bottom form for concrete pouring, and the upper flange is two separate limbs, and the open section is convenient for concrete pouring, and at the same time, the shear resistance between steel and concrete is increased. After the upper flange plate and the lower flange plate 1 are connected by a web, a PBL shear key is formed by a plurality of PBL shear key components 4 and the web, and is connected with a plurality of first shear nails 11 and a plurality of first shear bolts. The two shear nails 23 form a hybrid shear connection key, which is beneficial to improve the connection performance between steel and concrete. In the chord steel structure, each web plate and a corresponding upper flange plate form an inverted π-shaped section on the lower flange plate 1. The inverted π-shaped section can provide sufficient stiffness and stability to meet the requirements of concrete and concrete. Combined with the previous force requirements, the construction is convenient. In turn, the bonding ability between steel and concrete can be improved, the construction is convenient, and the quality is easy to guarantee. Thus, the technical effect of improving the bonding ability between steel and concrete, convenient construction and easy quality assurance can be achieved.

In order to describe in detail a chord system for a steel truss-concrete composite structure provided by the present invention, the above-mentioned embodiment provides a detailed description of a chord structure for a steel truss-concrete composite structure, based on the same invention Conceptually, the present application also provides a chord system for a steel truss-concrete composite structure, see the second embodiment for details.

Embodiment 2

The second embodiment of the present invention provides a chord system for a steel truss-concrete composite structure, including a concrete structure 5 and the chord structure for a steel truss-concrete composite structure. The concrete structure 5 is poured In the space formed by the lower flange plate 1, a plurality of upper flange plates and the web.

The present invention provides a chord system for a steel truss-concrete composite structure. A plurality of first shear nails 11 are fixed on the lower flange plate 1, and a plurality of second shear forces are fixed on the upper flange plate. Nail 23. Each web is fixedly connected to the lower flange plate 1 through the lower end, the web is fixedly connected to the corresponding upper flange plate through the upper end, and the lower end and the lower flange plate 1 are perpendicular to each other, A plurality of PBL shear key parts 4 respectively penetrate through the middle section of each web, so that each of the middle sections is connected by the PBL shear key parts 4, and the plurality of PBL shear key parts 4 are arranged along the lower part. The flange plate 1 is distributed along the extending direction of its length, and the lower flange plate 1 , a plurality of upper flange plates and the web form a space for pouring the concrete structure 5 . In this way, the lower flange plate 1 can be used as a bottom form for concrete pouring, and the upper flange is two separate limbs, and the open section is convenient for concrete pouring, and at the same time, the shear resistance between steel and concrete is increased. After the upper flange plate and the lower flange plate 1 are connected by a web, a PBL shear key is formed by a plurality of PBL shear key components 4 and the web, and is connected with a plurality of first shear nails 11 and a plurality of first shear bolts. The two shear nails 23 form a hybrid shear connection key, which is beneficial to improve the connection performance between steel and concrete. In the chord steel structure, each web plate and a corresponding upper flange plate form an inverted π-shaped section on the lower flange plate 1. The inverted π-shaped section can provide sufficient stiffness and stability to meet the requirements of concrete and concrete. Combined with the previous force requirements, the construction is convenient. In turn, the bonding ability between steel and concrete can be improved, the construction is convenient, and the quality is easy to guarantee. Thus, the technical effect of improving the bonding ability between steel and concrete, convenient construction and easy quality assurance can be achieved.

Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to examples, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent substitutions without departing from the spirit and scope of the technical solutions of the present invention should be included in the scope of the claims of the present invention.

Claims (10)

1. A chord structure for a steel truss-concrete composite structure, characterized in that it comprises: a lower flange plate, a plurality of upper flange plates, a web plate having the same number as a plurality of the upper flange plates, A plurality of PBL shear key components, a plurality of first shear nails are fixed on the lower flange plate; a plurality of second shear nails are fixed on the upper flange plate; the web includes a lower end , the middle section and the upper end, each of the webs is fixedly connected through the lower end and the lower flange plate, the web is fixedly connected through the upper end and a corresponding upper flange plate, the lower end is fixedly connected It is perpendicular to the lower flange plate, the upper end is perpendicular to the upper flange plate, and a plurality of the PBL shear key components respectively pass through each of the intermediate sections, so that each of the intermediate sections passes through. The PBL shear key components are connected, and a plurality of the PBL shear key components are distributed along the length extension direction of the lower flange plate, and the lower flange plate, a plurality of upper flange plates and the web are formed Space available for pouring concrete structures. 2 . The chord structure for steel truss-concrete composite structure according to claim 1 , further comprising: a side plate, the side plate is connected with the lower flange plate, and the side plate is connected to the lower flange plate. 3 . The lower flange plates are perpendicular. 3. The chord structure for a steel truss-concrete composite structure of claim 1, wherein the plurality of upper flange plates comprises a first upper flange plate and a second upper flange plate; and The plurality of webs with the same number of upper flange plates include a first web and a second web, the first web includes a first lower end, a first middle section and a first upper end, the first middle The segment is provided with a plurality of first openings, the first lower end is connected with the lower flange plate, the first upper end is connected with the first upper flange plate; the second web includes a first Two lower ends, a second middle section and a second upper end, the second middle section is provided with a plurality of second openings, the second lower end is connected to the lower flange plate, the second upper end is connected to the The second upper flange plate is connected, and the PBL shear key component penetrates the first opening and the corresponding second opening. 4. The chord structure for a steel truss-concrete composite structure according to claim 3, wherein the plurality of PBL shear key components are distributed at equal intervals, and the PBL shear key components include steel bars. 5. The chord structure for steel truss-concrete composite structure according to claim 3, characterized in that: the first upper flange plate and the first upper end are in an inverted L shape; the second upper flange plate is in an inverted L shape; The flange plate and the second upper end are in an inverted L shape. 6. The chord structure for a steel truss-concrete composite structure according to claim 3, wherein: the first upper flange plate and the first upper end are T-shaped; the second upper wing The edge plate and the second upper end are T-shaped. 7. The chord structure for steel truss-concrete composite structure according to claim 3, wherein: the first upper end is fixed at the center of the first upper flange plate; the second upper end fixed at the center of the second upper flange plate. 8. The chord structure for steel truss-concrete composite structure according to claim 1, characterized in that: the width of the lower flange plate is in the range of 800mm to 2000mm; the lower end, the middle section The value range of the sum of the lengths of the upper ends is 300 mm to 1000 mm. 9 . The chord structure for a steel truss-concrete composite structure according to claim 1 , wherein the width of the upper flange plate is less than half the width of the lower flange plate. 10 . 10. A chord system for a steel truss-concrete composite structure, comprising a concrete structure, characterized in that it further comprises the chord structure for a steel truss-concrete composite structure according to any one of claims 1 to 9 , the concrete structure is cast in the space formed by the lower flange plate, a plurality of upper flange plates and the web.

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