Steel-UHPC fish-bellied combined truss

Abstract

The utility model discloses a steel-UHPC fish belly type composite truss, which comprises a steel lower chord member, a UHPC upper chord member and a UHPC web member for connecting the steel lower chord member and the UHPC upper chord member, the steel lower chord member is arc-shaped, and two end parts of the UHPC upper chord member are connected with the steel lower chord member. The steel-UHPC fish-bellied combined truss provided by the utility model simultaneously meets the characteristics of attractive structure, large-span stress and guarantee of buckling stability of the web members, and can improve the construction speed.

Description

Technical Field

[0001] The utility model relates to the technical field of truss structures, in particular to a steel-UHPC fish-belly type combined truss. Background Art

[0002] A truss is a plane or space structure composed of rods, usually with triangular units. Truss rods mainly bear axial tension or pressure, so as to make full use of the strength of the material, reduce deadweight and increase rigidity. Usually, the lower chord of the truss structure is arranged in a straight line, and the structure is relatively rigid, which is difficult to meet the aesthetic requirements.

[0003] At present, the more common truss structures are mainly steel trusses, reinforced concrete trusses, prestressed concrete trusses and steel-concrete composite trusses. Among them, steel trusses have the widest application range and fast construction speed, but they need to be treated with anti-corrosion and fire prevention. Although concrete trusses have good durability, the self-weight of the structure accounts for a large proportion and is relatively bulky. Steel-concrete composite trusses have the advantages of both structures. However, in traditional steel-concrete composite trusses, the web members are mostly made of steel, and the upper and lower chords are mostly made of reinforced concrete or prestressed concrete. The web members still have the problem of buckling stability. Although this problem can be solved by partially covering with concrete, the construction speed is significantly reduced.

[0004] Ultra-high performance concrete (UHPC) has the advantages of high strength, good toughness and corrosion resistance, and has been widely used. The super strong mechanical properties of UHPC can further reduce the cross-section of steel-concrete composite trusses, thereby reducing their own weight and enhancing their spanning capacity.

[0005] In view of this, an object of the present invention is to provide a new steel-concrete composite truss structure. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a steel-UHPC fish-belly composite truss, which simultaneously satisfies the characteristics of beautiful structure, large-span force bearing and ensuring the buckling stability of the web rod, and can improve the construction speed.

[0007] The technical solution of the utility model is as follows:

[0008] A steel-UHPC fish-belly composite truss comprises a steel lower chord, a UHPC upper chord, and a UHPC web connecting the steel lower chord and the UHPC upper chord, wherein the steel lower chord is in an arc shape, and both ends of the UHPC upper chord are connected to the steel lower chord.

[0009] Furthermore, the cross-sections of the UHPC upper chord and the UHPC web are rectangular.

[0010] Furthermore, the UHPC upper chord and the UHPC web are integrally cast.

[0011] Furthermore, the UHPC upper chord and the UHPC web are respectively provided with longitudinal steel bars and stirrups perpendicular to each other, and the longitudinal steel bars and stirrups are connected and fixed by bundling or welding.

[0012] Furthermore, the UHPC web members in the mid-span region are rounded at the intersections.

[0013] Furthermore, the cross sections of both ends of the UHPC upper chord are heightened.

[0014] Furthermore, the steel lower chord is made of H-shaped steel, which includes a web and a first wing plate and a second wing plate connected on both sides of the web, the first wing plate and the second wing plate are arc-shaped, the web is arranged perpendicular to the first wing plate and the second wing plate, and the ends of the UHPC web and the UHPC upper chord are connected to the first wing plate.

[0015] Furthermore, connecting screws are pre-embedded in the ends of the UHPC web members and the UHPC upper chord members, and the ends of the UHPC web members and the UHPC upper chord members are connected and fixed to the first wing panel through the connecting screws.

[0016] Compared with the prior art, the steel-UHPC fish-belly composite truss provided by the utility model has the following beneficial effects:

[0017] 1. The steel-UHPC fish-belly composite truss provided by the utility model combines the stress characteristics of the truss under external load, that is, the upper chord is compressed, the lower chord is tensile, and the web is compressed or tensile. The upper chord and web are made of UHPC material, and the lower chord is made of H-shaped steel, which fully utilizes the mechanical properties of UHPC material and steel. At the same time, the stability of the compressed web is greatly improved, and the spanning capacity is greatly increased.

[0018] 2. The steel-UHPC fish-belly composite truss provided by the utility model uses pre-embedded screws to connect the UHPC web and the steel lower chord, and uses pre-embedded screws to connect the UHPC upper chord and the steel lower chord, which greatly speeds up the construction progress.

[0019] 3. The steel-UHPC fish-belly composite truss provided by the utility model has a steel lower chord in an arc shape, so that the truss structure is a fish-belly structure, which gives the structure a more aesthetic feel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a structural schematic diagram of the steel-UHPC fish-belly composite truss of the utility model;

[0022] Figure 2 It is a schematic diagram of the node of the UHPC upper chord and the UHPC web in the utility model;

[0023] Figure 3 It is a schematic diagram of the connection structure between the UHPC web member and the steel lower chord member in the utility model. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention and to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, the specific implementation methods of the present invention are further described below.

[0025] It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each embodiment of the present invention described below can be combined with each other as long as there is no conflict between them.

[0026] Please refer to Figure 1-Figure 3 ,in Figure 1 This is a structural diagram of the steel-UHPC fish-belly composite truss of the utility model. Figure 2 It is a schematic diagram of the node of the UHPC upper chord and the UHPC web in the utility model; Figure 3 It is a schematic diagram of the connection structure of the UHPC web member and the steel lower chord member in the utility model. The steel-UHPC fish-belly composite truss of the utility model comprises a UHPC upper chord member 1, a UHPC web member 2 and a steel lower chord member 3, wherein the UHPC web member 2 is arranged between the UHPC upper chord member 1 and the steel lower chord member 3, and is connected to the UHPC upper chord member 1 and the steel lower chord member 3, and both ends of the UHPC upper chord member 1 are connected to the steel lower chord member 3, and the steel lower chord member 3 is in an arc shape.

[0027] In this embodiment, the cross-sections of the UHPC upper chord 1 and the UHPC web 2 are rectangular. Preferably, the UHPC upper chord 1 and the UHPC web 2 are integrally cast and formed using UHPC materials. The UHPC upper chord 1 and the UHPC web 2 are respectively provided with longitudinal steel bars 4 and stirrups 5 perpendicular to each other. During casting, the longitudinal steel bars 4 in the UHPC upper chord 1 are arranged along the entire length of the rod and are perpendicular to the stirrups 5 of the UHPC upper chord. The two are connected by bundling or welding to form a steel skeleton and are placed in the formwork; the longitudinal steel bars 4 of the UHPC web 2 are arranged along the entire length of the rod and are perpendicular to the stirrups 5 of the UHPC web. The two are connected by bundling or welding to form a steel skeleton and are placed in the formwork. The longitudinal steel bars 4 of the UHPC web need to be bent at the nodes of the UHPC upper chord 1 and the UHPC web 2 to enter the UHPC upper chord 1 and ensure a certain anchoring length.

[0028] In this embodiment, the UHPC web members 2 in the mid-span region are rounded at the intersection, giving an aesthetic design.

[0029] In this embodiment, the steel lower chord 3 is made of H-shaped steel, which includes a web 31 and a first wing 32 and a second wing 33 connected on both sides of the web, the first wing 32 and the second wing 33 are arc-shaped, the web 31 is arranged perpendicular to the first wing 32 and the second wing 33, and the ends of the UHPC web 2 and the UHPC upper chord 1 are connected to the first wing 32. Specifically, a connecting screw 6 is pre-embedded at the ends of the UHPC web 2 and the UHPC upper chord 1, and the ends of the UHPC web 2 and the UHPC upper chord 1 are connected and fixed to the first wing 32 through the connecting screw 6 and the nuts 7 that cooperate with the connecting screw.

[0030] In order to further facilitate the connection between the steel lower chord 3 and the UHPC upper chord 1 , in this embodiment, the cross sections of both ends of the UHPC upper chord 1 are heightened.

[0031] In the steel-UHPC fish-belly composite truss of the utility model, the UHPC web member 2 and the UHPC upper chord member 1 are prefabricated and then assembled with the steel lower chord member 3 at the construction site to complete the installation of the composite truss, thereby improving the construction efficiency.

[0032] The steel-UHPC fish-belly composite truss of the utility model has symmetrically designed components, thereby eliminating the influence of possible eccentric force.

[0033] Compared with the prior art, the steel-UHPC fish-belly composite truss provided by the utility model has the following beneficial effects:

[0034] 1. The steel-UHPC fish-belly composite truss provided by the utility model combines the stress characteristics of the truss under external load, that is, the upper chord is compressed, the lower chord is tensile, and the web is compressed or tensile. The upper chord and web are made of UHPC material, and the lower chord is made of H-shaped steel, which fully utilizes the mechanical properties of UHPC material and steel. At the same time, the stability of the compressed web is greatly improved, and the spanning capacity is greatly increased.

[0035] 2. The steel-UHPC fish-belly composite truss provided by the utility model uses pre-embedded screws to connect the UHPC web and the steel lower chord, and uses pre-embedded screws to connect the UHPC upper chord and the steel lower chord, which greatly speeds up the construction progress.

[0036] 3. The steel-UHPC fish-belly composite truss provided by the utility model has a steel lower chord in an arc shape, so that the truss structure is a fish-belly structure, which gives the structure a more aesthetic feel.

[0037] The above is a detailed description of the embodiments of the present invention, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations made to these embodiments without departing from the principle and spirit of the present invention still fall within the scope of protection of the present invention.

Claims

1. A steel-UHPC fish-belly composite truss, characterized in that: It comprises a steel lower chord, a UHPC upper chord and a UHPC web connecting the steel lower chord and the UHPC upper chord. The steel lower chord is in an arc shape, and both ends of the UHPC upper chord are connected to the steel lower chord.

2. The steel-UHPC fish-belly composite truss according to claim 1 is characterized in that: The cross-sections of the UHPC upper chord and the UHPC web are rectangular.

3. The steel-UHPC fish-belly composite truss according to claim 1 is characterized in that: The UHPC upper chord and the UHPC web are integrally cast and formed.

4. The steel-UHPC fish-belly composite truss according to claim 3 is characterized in that: The UHPC upper chord and the UHPC web are respectively provided with longitudinal steel bars and stirrups perpendicular to each other, and the longitudinal steel bars and stirrups are connected and fixed by bundling or welding.

5. The steel-UHPC fish-belly composite truss according to claim 1, characterized in that: The UHPC web members in the mid-span region are rounded at the intersections.

6. The steel-UHPC fish-belly composite truss according to claim 1, characterized in that: The cross sections of both ends of the UHPC upper chord are heightened.

7. The steel-UHPC fish-belly composite truss according to any one of claims 1 to 6, characterized in that: The steel lower chord is made of H-shaped steel, which includes a web and a first wing plate and a second wing plate connected on both sides of the web, the first wing plate and the second wing plate are arc-shaped, the web is arranged perpendicular to the first wing plate and the second wing plate, and the ends of the UHPC web and the UHPC upper chord are connected to the first wing plate.

8. The steel-UHPC fish-belly composite truss according to claim 7, characterized in that: The ends of the UHPC web members and the UHPC upper chord members are pre-embedded with connecting screws, and the ends of the UHPC web members and the UHPC upper chord members are connected and fixed to the first wing panel through the connecting screws.

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