Anti-fatigue UHPC (Ultra High Performance Concrete)-profile steel composite beam

Abstract

The utility model discloses an anti-fatigue UHPC (Ultra High Performance Concrete)-profile steel composite beam, and belongs to the field of composite beams. Comprising I-shaped steel of which the upper end is provided with a concrete layer and the lower end is provided with a reinforcing layer; a bearing capacity reinforcing structure is further arranged on the I-shaped steel; the bearing capacity reinforcing structure comprises bearing pieces arranged on the upper flange of the I-shaped steel and the right-angle position of the web, and a reinforcing piece is arranged between the two bearing pieces on the same side of the web. The UHPC-profile steel combined beam has the advantages that the UHPC-profile steel combined beam is used for replacing a traditional steel-concrete combination, the dead weight of the structure can be obviously reduced, bridge construction is simplified, the durability of the structure is improved, and the manufacturing cost is reduced. And the anti-fatigue capability of the composite beam is enhanced by adopting carbon fiber cloth or carbon fiber plates. A bearing capacity reinforcing structure is further arranged on the I-shaped steel, the acting force of deformation of the I-shaped steel flange can be well enhanced through the bearing capacity reinforcing structure, and the service life of the structure is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of anti-fatigue UHPC-steel section composite beam, belong to the field of composite beam. BACKGROUND

[0002] Steel-concrete composite structure combines the advantages of concrete structure and steel structure, so that the composite structure has light weight, good durability and economic reliability, and has been widely used in practical engineering. However, there are many problems in the construction process of steel-concrete composite beam, such as cracking of cast-in-place wet joints in the negative bending moment area of the pier top.

[0003] Ultra-high performance concrete (UHPC) is a new type of cement-based composite material with ultra-high strength, ultra-high toughness, ultra-high durability and fatigue resistance. Hot-rolled steel has the advantages of low cost, low residual stress and high section utilization rate. Therefore, the UHPC-steel composite beam is combined to replace the traditional steel-concrete composite structure, which can significantly reduce the structure weight, simplify the bridge construction, improve the structure durability and reduce the cost.

[0004] However, when the UHPC-steel composite beam is subjected to fatigue load, the lower steel may be subjected to fatigue fracture failure mode, so the problem needs to be improved. SUMMARY

[0005] The utility model aims to provide a kind of anti-fatigue UHPC-steel composite beam, which can effectively solve the above problems.

[0006] To solve the above technical problems, the utility model is realized by the following technical solutions:

[0007] It comprises an I-beam, a concrete layer is arranged at the upper end of the I-beam, and a reinforcing layer is arranged at the lower end of the I-beam.

[0008] The I-beam is further provided with a bearing capacity strengthening structure, which comprises a bearing member arranged at the right angle between the upper flange and the web of the I-beam, and a reinforcing member arranged between the two bearing members on the same side of the web.

[0009] The bearing member is composed of a vertical plate, a long horizontal plate arranged on the upper end surface of the vertical plate, and a short horizontal plate arranged on the lower end surface of the vertical plate.

[0010] Further, an inclined stress plate is arranged between the long horizontal plate and the short horizontal plate, and a horizontal plate parallel to the lower end surface of the long horizontal plate is arranged at the upper end of the stress plate.

[0011] Further, the reinforcing member is composed of a channel steel, which comprises a waist plate and two steel legs arranged on one side of the waist plate, and the steel leg structure is arranged in a right-angle trapezoidal shape.

[0012] Further, the reinforcing member and the I-beam are fixed together through a pressing structure, the pressing structure comprises mounting columns fixed on both sides of the web plate, mounting holes arranged on the waist plate, the mounting columns are provided with external threads on the outer periphery, and the mounting columns penetrate through the mounting holes, and the mounting columns are threadedly connected with pressing nuts at the end portions.

[0013] Further, the steel leg has a length equal to the thickness of the vertical plate, and the short transverse plate has a length equal to the thickness of the waist plate.

[0014] Further, the mounting columns are four in number and are symmetrically fixed in two groups on both sides of the web plate.

[0015] Further, the I-beam is an H-shaped steel.

[0016] Further, the reinforcing layer is a carbon fiber plate or a carbon fiber cloth.

[0017] Beneficial effects are:

[0018] 1. The UHPC-steel combined beam is used to replace the traditional steel-concrete combination, which can significantly reduce the self weight of the structure, simplify the bridge construction, improve the durability of the structure and reduce the cost and the like.

[0019] 2. The carbon fiber cloth or the carbon fiber plate is used to reinforce the bottom of the steel combined beam through the epoxy adhesive, which can compensate for the shortcomings of the steel due to the light weight, good fatigue resistance, good tensile performance and the like of the carbon fiber cloth; however, the carbon fiber is expensive, and therefore, the carbon fiber cloth is used only in some areas to play a role together with the steel.

[0020] 3. The I-beam is further provided with a bearing capacity reinforcing structure, which can well enhance the deformation force of the flange of the I-beam and improve the service life of the structure. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to facilitate the description, the utility model is described in detail by the following specific implementation and drawings.

[0022] Fig. 1 It is a structural schematic view of the utility model;

[0023] Fig. 2 It is a front view of the utility model;

[0024] Fig. 3 It is a cross-sectional view of the pressing structure of the utility model.

[0025] Explanation of reference signs:

[0026] 1, I-beam; 11, flange; 12, web; 2, concrete layer; 3, reinforcing layer; 4, load capacity reinforcing structure; 41, load bearing member; 411, vertical plate; 412, long cross plate; 413, short cross plate; 414, stress plate; 415, horizontal plate; 42, reinforcing member; 421, steel leg; 422, waist plate; 5, compression structure; 51, mounting column; 52, mounting hole; 53, compression nut. DETAILED DESCRIPTION

[0027] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0028] It should be noted that in the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0029] In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] Meanwhile, in the description of the present application, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] Reference Figs. 1-3 An embodiment of the present application is an anti-fatigue UHPC-shaped steel composite beam,

[0032] The main structure of the composite beam is an I-beam 1, and a concrete layer 2 is arranged at the upper end of the I-beam 1, and the concrete layer 2 is made of ultra-high performance concrete (UHPC);

[0033] The compressive strength of the UHPC is generally more than 120 MPa, and can even reach more than 200 MPa, which is 4-6 times of that of ordinary concrete, thereby significantly improving the bearing capacity of the composite beam; the UHPC also has high tensile strength and micro-crack self-healing capacity, which can effectively improve the problem that the traditional steel-concrete composite beam is prone to cracking in the negative bending moment area, and prolong the service life of the structure; the composite beam formed by the combination of the UHPC and the I-shaped steel 1 is suitable for prefabricated assembly construction, and can shorten the construction period and improve the construction efficiency.

[0034] The reinforcing layer 3 made of carbon fiber plate or carbon fiber cloth material is adhered to the lower end of the I-shaped steel 1 by using epoxy.

[0035] The carbon fiber cloth or carbon fiber plate can enhance the fatigue resistance of the composite beam, and the light weight, good fatigue resistance and good tensile performance of the carbon fiber cloth can make up for the shortcomings of the steel.

[0036] The I-shaped steel 1 used in the bearing capacity reinforcing structure 4 is an H-shaped steel, which has a vertical web 12 and flanges 11 arranged at the upper and lower ends of the web 12; the bearing capacity reinforcing structure 4 includes bearing members 41 arranged at the right angles between the flanges 11 and the web 12 of the I-shaped steel 1, two bearing members 41 are arranged on the lower end surface of the upper flange 11 on both sides of the web 12, and two bearing members 41 are arranged on the upper end surface of the lower flange 11 on both sides of the web 12, and the total number of the bearing members 41 is four.

[0037] A reinforcing member 42 is arranged between the two bearing members 41 on the same side of the web 12.

[0038] The bearing member 41 is composed of a vertical plate 411, a long horizontal plate 412 arranged on the upper end surface of the vertical plate 411, and a short horizontal plate 413 arranged on the lower end surface of the vertical plate 411. The long horizontal plate 412 abuts against the lower end surface of the upper flange 11, and the short horizontal plate 413 has a gap with the reinforcing member 42; this causes the reinforcing member 42 not to be in direct contact with the bearing member 41, and when the entire structure is subjected to strong pressure and the bearing member 41 deforms, the short horizontal plate 413 will be in contact with the reinforcing member 42, and the reinforcing member 42 is used to absorb the pressure, so that the entire structure is more stable.

[0039] An inclined stress plate 414 is arranged between the long horizontal plate 412 and the short horizontal plate 413, and a horizontal plate 415 parallel to the lower end surface of the long horizontal plate 412 is arranged on the upper end of the stress plate 414.

[0040] When the flange 11 at the uppermost end of the I-beam 1 deforms, the deforming force is directly transmitted to the shorter horizontal plate 413 through the stress plate 414, which can improve the stability of the entire structure; the main function of the horizontal plate 415 is to increase the contact area of the stress plate 414 with the long horizontal plate 412 and the shorter horizontal plate 413, so as to facilitate the rapid transmission of force and prevent the force from being more concentrated.

[0041] The reinforcing member 42 is composed of a channel steel, which includes a web plate 422 and two steel legs 421 arranged on one side of the web plate 422, and the steel legs 421 are arranged in the form of a right trapezoid.

[0042] When the shorter horizontal plate 413 exerts a force on the reinforcing member 42, the structure of the steel legs 421 can well cope with the force.

[0043] The reinforcing member 42 and the I-beam 1 are fixed together through the pressing structure 5, which includes mounting columns 51 fixed on both sides of the web plate 12 and mounting holes 52 arranged on the web plate 422 of the channel steel, the mounting columns 51 are provided with external threads on the outer periphery, the mounting columns 51 penetrate the mounting holes 52, and the end portions of the mounting columns 51 are threadedly connected with pressing nuts 53.

[0044] The pressing structure 5 in the device is mainly used to fix the reinforcing member 42 and the I-beam 1 together, and when the bearing member 41 exerts a force on the reinforcing member 42, the pressing structure 5 can help fix the position of the reinforcing member 42, which can better absorb the force.

[0045] When the reinforcing member 42 is installed, the mounting holes 52 of the web plate 422 of the reinforcing member 42 are aligned with the mounting columns 51, then the web plate 422 is pushed towards the web plate 12, and then the external threads on the end portions of the mounting columns 51 are tightened with the pressing nuts 53, so that the entire reinforcing member 42 can be pressed on the web plate 12.

[0046] The length of the steel legs 421 is equal to the thickness of the vertical plate 411, and the length of the shorter horizontal plate 413 is equal to the thickness of the web plate 422.

[0047] Such arrangement is convenient for processing, and mainly to make the length of the shorter horizontal plate 413 equal to the thickness of the web plate 422, so that when the shorter horizontal plate 413 deforms and contacts the web plate 422, the web plate 422 can well contact the shorter horizontal plate 413.

[0048] The number of mounting columns 51 is four, which are symmetrically fixed on both sides of the web plate 12 in two groups.

[0049] Such arrangement is mainly to stably fix the reinforcing member 42 on the web plate 12.

[0050] The above embodiments are merely exemplary rather than limiting. Based on the above description, those skilled in the art can make other different forms of changes or modifications. Here, all the embodiments are not required to be exhaustive. The obvious changes or modifications derived therefrom are still within the protection scope of the present application.

Claims

1. A fatigue-resistant UHPC-steel composite beam, characterized by: The utility model provides a kind of steel reinforced concrete column, including I-shaped steel (1), the upper end of the I-shaped steel (1) is provided with concrete layer (2), the lower end is provided with reinforcing layer (3);Wherein, the I-shaped steel (1) is further provided with bearing capacity reinforcing structure (4);The bearing capacity reinforcing structure (4) includes bearing (41) being arranged at the right angle of upper flange (11) and web (12) of the I-shaped steel (1), and reinforcing member (42) is arranged between the bearing (41) on the same side of the web (12);The bearing (41) is constituted by vertical plate (411), long cross plate (412) being arranged on the upper end surface of the vertical plate (411) and short cross plate (413) being arranged on the lower end surface of the vertical plate (411).

2. The fatigue-resistant UHPC-steel composite beam according to claim 1, characterized in that: Inclined stress plate (414) is arranged between the long cross plate (412) and the short cross plate (413), and horizontal plate (415) parallel to the long cross plate (412) and lower end surface is arranged at the upper end of the stress plate (414).

3. The fatigue-resistant UHPC-steel composite beam according to claim 2, characterized in that: The reinforcing member (42) is constituted by channel steel, the channel steel includes waist plate (422) and two steel legs (421) being arranged on one side of the waist plate (422), and the steel leg (421) is structured and arranged as right-angle trapezoid.

4. The fatigue-resistant UHPC-steel composite beam according to claim 3, characterized in that: The reinforcing member (42) and the I-shaped steel (1) are fixed together by pressing structure (5), the pressing structure (5) includes mounting column (51) being fixed on both sides of the web (12), mounting hole (52) being arranged on the waist plate (422), outer thread is arranged on the outer periphery of the mounting column (51), and the mounting column (51) penetrates the mounting hole (52), and pressing nut (53) is threadedly connected to the end of the mounting column (51).

5. The fatigue-resistant UHPC-steel composite beam according to claim 4, characterized in that: The length of the steel leg (421) is equal to the thickness of the vertical plate (411), and the length of the short cross plate (413) is equal to the thickness of the waist plate (422).

6. The fatigue-resistant UHPC-steel composite beam according to claim 5, characterized in that: The number of the mounting column (51) is four, and two groups are symmetrically fixed on both sides of the web (12).

7. The fatigue-resistant UHPC-steel composite beam according to claim 1, characterized in that: The I-shaped steel (1) adopts H-shaped steel.

8. The fatigue-resistant UHPC-steel composite beam according to claim 1, characterized in that: The reinforcing layer (3) adopts carbon fiber plate or carbon fiber cloth.

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