CN111139740A - Structure and method for improving cracking resistance of hogging moment area of steel-concrete composite beam bridge - Google Patents
Structure and method for improving cracking resistance of hogging moment area of steel-concrete composite beam bridge Download PDFInfo
- Publication number
- CN111139740A CN111139740A CN202010049127.8A CN202010049127A CN111139740A CN 111139740 A CN111139740 A CN 111139740A CN 202010049127 A CN202010049127 A CN 202010049127A CN 111139740 A CN111139740 A CN 111139740A
- Authority
- CN
- China
- Prior art keywords
- steel
- concrete
- hogging moment
- spacer
- beam bridge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/02—Bridges characterised by the cross-section of their bearing spanning structure of the I-girder type
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a structure and a method for improving the cracking resistance of a hogging moment area of a steel-concrete combined beam bridge, wherein the steel-concrete combined beam bridge is provided with the hogging moment area, the structure comprises a steel beam and a flange, and a stud is welded on the upper surface of the flange positioned at the top of the steel beam; the steel bar mesh is arranged on the steel beam; the separator is arranged on the outer side of the steel bar at the position of the steel bar mesh corresponding to the support in the extending direction of the steel bar mesh; ordinary concrete is poured at the position of the reinforcing mesh where the partition is not arranged; and high-performance concrete is poured at the position of the reinforcing mesh where the partition is arranged. According to the structure for improving the anti-cracking performance of the hogging moment area of the steel-concrete combined beam bridge, the concrete and the steel bars can be isolated through the isolating piece, the adhesion between the steel bars and the concrete is locally damaged, the force transfer between the steel bars and the concrete is cut off, the stress of the concrete is reduced, and meanwhile, the high-performance concrete is used for the hogging moment area, so that the anti-cracking performance of the concrete is improved.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a structure and a method for improving the cracking resistance of a hogging moment area of a steel-concrete composite beam bridge.
Background
In the related technology, the current infrastructure construction of China is developed rapidly, and the steel-concrete composite beam has superior performance due to the full play of the advantages of tension of steel beams and compression of concrete, and is used more and more widely in recent years. However, in the hogging moment region, the bending moment is negative, and the concrete is pulled, and the concrete generally has low tensile strength and is easy to crack. Therefore, the cracking problem of the hogging moment area of the steel-concrete composite beam is an important factor for restricting the wide application of the steel-concrete composite beam.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a structure for improving the anti-cracking performance of the hogging moment region of a steel-concrete composite beam bridge, which has the advantages of simple structure, convenient construction and good anti-cracking performance.
The invention also aims to provide a method for improving the cracking resistance of the hogging moment area of the steel-concrete composite beam bridge.
The structure for improving the hogging moment area cracking resistance of the steel-concrete composite beam bridge comprises a support, the steel-concrete composite beam bridge is provided with the hogging moment area, and the structure for improving the hogging moment area cracking resistance of the steel-concrete composite beam bridge comprises: the steel beam is arranged on the support and provided with a flange extending along the horizontal direction, and a stud is welded on the flange positioned at the top; a mesh reinforcement disposed over the steel beam, the mesh reinforcement having reinforcing bars extending in a horizontal direction; the separator is arranged on the outer side of the steel bar at the position of the steel bar mesh corresponding to the support in the extending direction of the steel bar mesh; ordinary concrete poured at a position of the reinforcing mesh where the spacer is not provided; high-performance concrete poured at a position of the reinforcing mesh where the spacer is provided.
According to the structure for improving the anti-cracking performance of the hogging moment area of the steel-concrete combined beam bridge, disclosed by the embodiment of the invention, the concrete and the reinforcing steel bars can be isolated through the isolating piece, the bonding between the reinforcing steel bars and the concrete is locally damaged, the force transfer between the reinforcing steel bars and the concrete is isolated, the stress of the concrete is reduced, and meanwhile, the high-performance concrete is used for the hogging moment area, so that the anti-cracking capacity of the concrete is improved.
In addition, the structure for improving the cracking resistance of the hogging moment area of the steel-concrete composite beam bridge according to the embodiment of the invention has the following additional technical characteristics:
according to some embodiments of the invention, the spacer is a low modulus of elasticity material and the modulus of elasticity of the spacer is lower than the modulus of elasticity of the ordinary concrete or the modulus of elasticity of the high performance concrete.
Further, the isolating piece is a rubber piece or a polyethylene plastic piece.
Still further, the spacer is configured in the shape of a sleeve, and an opening extending in the axial direction and penetrating through the sleeve in the thickness direction of the sleeve is formed on the sleeve, and the sleeve is adapted to be fastened to the outer side of the reinforcing steel bar through the opening.
In some embodiments of the present invention, the spacer includes a first sub spacer and a second sub spacer, and the first sub spacer and the second sub spacer are respectively sleeved on the outer sides of the reinforcing bars and fixed by a band member.
Optionally, the spacer is a rubber or plastic layer wound around the outside of the steel bar.
According to some embodiments of the invention, the high performance concrete has a higher tensile strength than the ordinary concrete, the high performance concrete comprising one of UHPC and ECC.
According to the method for improving the cracking resistance of the hogging moment area of the steel-concrete combined beam bridge, which is disclosed by the embodiment of the second aspect of the invention, the method for improving the cracking resistance of the hogging moment area of the steel-concrete combined beam bridge comprises the following steps: step S1: erecting a steel beam, and welding studs on the top surface of the flange of the steel beam; step S2: placing a reinforcing mesh on the top surface of the steel beam; step S3: in the extending direction of the reinforcing mesh, at least the outer side of the reinforcing steel bar at the position of the reinforcing mesh corresponding to the support is provided with a spacer; step S4: building a template, pouring common concrete at the position of the reinforcing mesh where the isolating piece is not arranged, and pouring high-performance concrete at the position of the reinforcing mesh where the isolating piece is arranged; wherein the tensile strength of the high-performance concrete is higher than that of ordinary concrete, and the high-performance concrete comprises one of UHPC and ECC; the steps S3 and S4 may be changed as follows: and firstly pouring common concrete at the position of the reinforcing mesh where the isolator is not arranged, then arranging the isolator, and finally pouring high-performance concrete at the position of the reinforcing mesh where the isolator is arranged.
Further, the isolation piece is a material piece with low elastic modulus, and the elastic modulus of the isolation piece is lower than that of the common concrete or that of the high-performance concrete.
In some embodiments of the present invention, the spacer is made of rubber or polyethylene, wherein the spacer is configured in the shape of a sleeve, the sleeve is formed with an opening extending in an axial direction and penetrating through the sleeve in a thickness direction of the sleeve, and the sleeve is adapted to be fastened to the outside of the steel bar through the opening; or the partition comprises a first sub-partition and a second sub-partition, and the first sub-partition and the second sub-partition are respectively sleeved on the outer side of the steel bar and fixed by a strip-shaped part; or the isolating piece is a rubber piece layer or a plastic piece layer wound on the outer side of the steel bar.
Compared with the prior art, the invention has the following advantages:
firstly, through the new thinking of 'resisting and releasing combination' and 'making the best of things', the bonding between the reinforcing steel bar and the concrete is locally damaged, the force transfer between the reinforcing steel bar and the concrete is cut off, the stress of the reinforcing steel bar is uniform and becomes the main bearing part of the tensile force, meanwhile, the internal tensile force is not transferred to the concrete, the deformation of the concrete is restrained, and the stress of the concrete is greatly reduced.
Secondly, high-performance concrete with higher tensile strength is used in the hogging moment area, the anti-cracking performance is improved, and meanwhile, the high-performance concrete adopted locally does not have great influence on the manufacturing cost.
Thirdly, the low elastic modulus material's separator low price, does not need too much extra work during the construction, easily guarantees the engineering quality.
Fourthly, compare in traditional steel reinforced concrete composite beam, the atress performance is superior, and simple structure can not produce too much influence to construction, cost etc. when promoting the performance.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic view of a structure for improving crack resistance in a hogging moment region of a steel-concrete composite girder bridge according to an embodiment of the present invention;
fig. 2 is a sectional view along a-a of the structure for improving the crack resistance of the hogging moment area of the steel-concrete composite girder bridge according to the embodiment of the present invention in fig. 1.
Reference numerals:
the structure 100 for improving the cracking resistance of the hogging moment area of the steel-concrete composite beam bridge,
the negative moment region 102 is formed by a negative moment region,
the length of the steel beam 1, the flanges 11,
the stud (2) is provided with a pin,
the length of the mesh reinforcement 3, the steel reinforcement 31,
the concrete-filled concrete comprises a spacer 4, ordinary concrete 5, high-performance concrete 6, a support 7 and a cushion block 8.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The structure 100 for improving the crack resistance of the hogging moment region of the steel-concrete composite girder bridge according to the embodiment of the present invention will be described with reference to the accompanying drawings. The structure 100 for improving the cracking resistance of the hogging moment area of the steel-concrete combined beam bridge has the advantages of reasonable stress distribution, best use of materials, safety, reliability and convenience in construction.
Referring to fig. 1 and 2, according to a structure 100 for improving the hogging moment region cracking resistance of a steel-concrete composite beam bridge according to an embodiment of the first aspect of the present invention, the structure 100 for improving the hogging moment region cracking resistance of a steel-concrete composite beam bridge includes a support 7, the steel-concrete composite beam bridge has a hogging moment region 102, and the structure 100 for improving the hogging moment region cracking resistance of a steel-concrete composite beam bridge includes: steel beam 1, steel mesh 3, spacer 4, normal concrete 5 and high performance concrete 6.
For example, referring to fig. 1, in some embodiments of the present invention, the structure 100 for improving the cracking resistance of the hogging moment region of the steel-concrete composite beam bridge may further include: cushion blocks 8, cushion blocks 8 can be arranged between the support 7 and the steel beam 1, and the hogging moment area 102 can be located near the support 7.
In particular, steel beam 1 is arranged on support 7, for example steel beam 1 can be arranged on support 7 via spacer 8, and steel beam 1 has a horizontally extending flange 11, on top of which flange 11 stud 2 is welded. For example, in some embodiments of the present invention, the steel beam 1 may be an i-beam, the steel beam 1 has a flange 11, the flange 11 may extend in a horizontal direction, the flange 11 may include two flanges spaced up and down, and the stud 2 may be welded to the upper surface of the flange 11 at the top. Therefore, the stud 2 is welded on the upper surface of the flange 11, which is positioned at the top, of the steel beam 1, so that the anti-cracking performance of the hogging moment area of the steel-concrete combined beam bridge is improved.
The mesh reinforcement 3 is placed on the steel beam 1, and the mesh reinforcement 3 has reinforcing bars 31 extending in a horizontal direction. For example, the mesh reinforcement 3 may be placed on top of the steel beam 1, where there is no direct connection between the mesh reinforcement 3 and the studs 2, the mesh reinforcement 3 having the reinforcing bars 31, and the reinforcing bars 31 may extend in a horizontal direction.
Spacers 4 are provided at least on the outside of the reinforcing bars 31 of the mesh reinforcement 3 at positions corresponding to the brackets 7 in the extending direction of the mesh reinforcement 3. For example, in the left-right direction shown in fig. 1, the outer sides of the reinforcing bars 31 at positions where the mesh reinforcement 3 and the support 7 correspond in the up-down direction may be provided with the spacers 4, and the outer sides of the reinforcing bars 31 at the top and bottom may be provided with the spacers 4.
For example, in some alternative embodiments of the present invention, spacers 4 are provided on the outside of the reinforcing bars 31 at least at the position of the mesh reinforcement 3 coinciding with the seat 7 in the length direction of the mesh reinforcement 3. In some alternative embodiments of the present invention, the steel mesh reinforcement 3 may also be provided with the spacer 4 at a predetermined distance from the support 7 in the length direction, and the predetermined distance may be adaptively set according to the need, which is not specifically limited by the present invention.
It should be noted that the above description of the setting position of the spacer 4 is only exemplary, and is not to be construed as limiting the present invention, and the setting position of the spacer 4 in practical applications may be adaptively set as needed, which is understood by those skilled in the art.
The common concrete 5 is poured at the position of the reinforcing mesh 3 where the separator 4 is not arranged; high-performance concrete 6 is poured on the reinforcing mesh 3 at the position where the spacer 4 is provided. Therefore, the common concrete 5 is poured at the position of the reinforcing mesh 3 where the partition 4 is not arranged, so that the cost is favorably controlled; the high-performance concrete 6 is poured at the position, provided with the partition 4, of the reinforcing mesh 3, so that the anti-cracking performance of the hogging moment area of the steel-concrete composite beam bridge is improved. Therefore, the high-performance concrete 6 with high tensile strength is used at the position of the reinforcing mesh 3 where the partition 4 is arranged, so that the anti-cracking performance is improved, and meanwhile, the high-performance concrete 6 is locally used, so that the manufacturing cost is not greatly influenced.
After concrete (including common concrete 5 and high-performance concrete 6) is poured, the stud 2 is equivalent to connecting the steel beam 1 with the concrete, the reinforcing mesh 3 is not connected with the stud 2 and the steel beam 1, and the reinforcing mesh 3 is arranged to be beneficial to reinforcing the concrete, so that the anti-cracking performance of the hogging moment area of the steel-concrete combined beam bridge is further promoted.
In addition, the outer side of the steel bar 31 at the position, corresponding to the support 7, of the steel bar mesh 3 is provided with the isolating piece 4, so that concrete can be isolated from the steel bar 31, the adhesion between the steel bar 31 and the concrete is locally damaged, the force transmission between the steel bar 31 and the concrete is isolated, the steel bar 31 is uniformly stressed and becomes a main bearing part of tensile force, meanwhile, the internal tensile force is not transmitted to the concrete, the deformation of the concrete is restrained, and the stress of the concrete is greatly reduced.
According to the structure 100 for improving the cracking resistance of the hogging moment area of the steel-concrete combined beam bridge, disclosed by the embodiment of the invention, the separator 4 is arranged on the outer side of the steel bar 31 at the position, corresponding to the support 7, of the steel bar net 3, so that the concrete can be separated from the steel bar 31, the adhesion between the steel bar 31 and the concrete is locally damaged, the force transmission between the steel bar 31 and the concrete is cut off, the stress of the concrete is reduced, and meanwhile, the high-performance concrete is used for the hogging moment area, so that the cracking resistance of the concrete is improved.
According to some embodiments of the invention, the spacer 4 is a low modulus of elasticity material, and the modulus of elasticity of the spacer 4 is lower than the modulus of elasticity of normal concrete 5 or the modulus of elasticity of high performance concrete 6. For example, in some embodiments of the invention, the spacer 4 may be a piece of material with a low modulus of elasticity, and the modulus of elasticity of the spacer 4 may be lower than that of ordinary concrete 5. In some embodiments of the invention, the spacer 4 may be a low modulus of elasticity material, and the modulus of elasticity of the spacer 4 may be lower than the modulus of elasticity of the high performance concrete 6.
Further, the spacer 4 is made of rubber or polyethylene. For example, in some embodiments of the present invention, the spacer 4 may be a rubber member such as a high performance rubber member or the like; in some embodiments of the present invention, the spacer 4 may also be a polyethylene-based plastic.
For example, in some embodiments of the invention, the modulus of elasticity of the spacer 4 may be much lower than the modulus of elasticity of normal concrete 5 or the modulus of elasticity of high performance concrete 6. In some embodiments of the present invention, the elastic modulus of the concrete is approximately 30GPa, and the elastic modulus of the spacer 4 (e.g., rubber member) is approximately 0.01GPa, but the present invention is not limited thereto.
Several embodiments of the spacer 4 in the structure 100 for improving the crack resistance of the hogging moment region of the steel-concrete composite girder bridge according to the present invention will be described with reference to the accompanying drawings.
The first embodiment is as follows:
in some embodiments of the present invention, the spacer 4 may be configured in the shape of a sleeve formed with an opening extending in the axial direction and penetrating the sleeve in the thickness direction thereof, the sleeve being adapted to be fastened to the outside of the reinforcing bar 31 through the opening.
For example, the spacer 4 may be a one-piece structure, the spacer 4 may be configured in the shape of a sleeve, the sleeve may have an opening formed thereon, the opening may extend in an axial direction of the sleeve, and the opening may be provided through the sleeve in a thickness direction of the sleeve, the sleeve being adapted to be fastened to an outer side of the reinforcing bar 31 through the opening.
Example two:
in some embodiments of the present invention, the spacer 4 includes a first sub-spacer and a second sub-spacer, which are respectively sleeved on the outer sides of the reinforcing bars 31 and fixed by a band member.
For example, in some embodiments of the present invention, the spacer 4 may be a split structure, the spacer 4 may include a first sub spacer and a second sub spacer, the first sub spacer and the second sub spacer are respectively sleeved on the outer sides of the reinforcing bars 31, and the first sub spacer and the second sub spacer may be fixed by a band member. Thus, the first sub-spacer and the second sub-spacer can be fixed to the outer side of the reinforcing bar 31 by the band-shaped member, and reliability is high.
Wherein the band-shaped member may be, for example, an adhesive tape, a string, or the like.
In some embodiments of the present invention, the first sub-spacer and the second sub-spacer may have symmetrical structures, for example, the first sub-spacer and the second sub-spacer may have the same structure; of course, in some embodiments of the present invention, the first sub-spacer and the second sub-spacer may also be disposed asymmetrically, and the present invention is not limited to this.
Example three:
in some embodiments of the present invention, the spacer 4 is a rubber or plastic layer wound around the outside of the steel bar 31.
For example, in some alternative embodiments of the present invention, the spacer 4 may be a rubber or plastic layer wound around the outside of the steel bar 31. The rubber member layer or the plastic member layer may include one or more turns wound around the outside of the reinforcing bars 31, and the present invention is not particularly limited thereto.
Here, it should be noted that the above description of the specific structure of the spacer 4 is only exemplary and should not be construed as limiting the present invention, which will be understood by those skilled in the art.
According to some embodiments of the invention, the high performance concrete 6 has a higher tensile strength than the ordinary concrete 5, the high performance concrete 6 comprising one of UHPC and ECC. For example, the high performance concrete 6 may have a higher tensile strength than ordinary concrete 5, and in some embodiments, the high performance concrete 6 may include UHPC; in some embodiments, the high performance concrete 6 may include ECC.
Among them, UHPC, i.e., Ultra-High Performance Concrete, also called Reactive Powder Concrete (RPC), is an innovative cement-based engineering material in the last thirty years, and realizes a large span of engineering material Performance.
UHPC is an ultra-high strength cement-based material with high strength, high toughness and low porosity. The basic preparation principle is as follows: by increasing the fineness and activity of the components, coarse aggregate is not used, and defects (pores and microcracks) in the material are minimized, so that ultrahigh strength and high durability are obtained.
The UHPC can be called as an engineering material with good durability, the mechanical property of the UHPC with proper reinforcement is close to that of a rigid structure, and meanwhile, the UHPC has excellent wear resistance and anti-explosion performance. Therefore, UHPC is particularly suitable for use in large span bridges, blast resistant structures (military engineering, bank vaults, etc.) and thin-walled structures, as well as in highly abrasive, highly corrosive environments. Currently, UHPC has been used in practical projects such as large-span pedestrian overpasses, highway and railway bridges, thin-walled silos, nuclear waste tanks, wire rope anchor stiffeners, ATM protective casings, and the like.
ECC, Engineered Cementitious composites, which are fiber reinforced Cementitious composites, have high ductility and tight fracture width control.
According to the method for improving the cracking resistance of the hogging moment area of the steel-concrete combined beam bridge, which is disclosed by the embodiment of the second aspect of the invention, the method for improving the cracking resistance of the hogging moment area of the steel-concrete combined beam bridge comprises the following steps: step S1: erecting a steel beam, and welding studs on the top surface of the flange of the steel beam; step S2: placing a reinforcing mesh on the top surface of the steel beam; step S3: in the extending direction of the reinforcing mesh, at least the outer side of the reinforcing steel bar at the position of the reinforcing mesh corresponding to the support is provided with a spacer; step S4: building a template, pouring common concrete at the position of the reinforcing mesh where the partition is not arranged, and pouring high-performance concrete at the position of the reinforcing mesh where the partition is arranged; wherein the tensile strength of the high-performance concrete is higher than that of ordinary concrete, and the high-performance concrete comprises one of UHPC and ECC. For example, in some embodiments, the high performance concrete may include UHPC; in some embodiments, the high performance concrete may include ECC.
Wherein, the steps S3 and S4 can be changed as follows: and firstly pouring common concrete at the position of the reinforcing mesh where the isolator is not arranged, then arranging the isolator, and finally pouring high-performance concrete at the position of the reinforcing mesh where the isolator is arranged.
Specific embodiments of a method for improving the crack resistance of the hogging moment region of a steel-concrete composite girder bridge according to the second aspect of the present invention will be described below with reference to the accompanying drawings.
The first embodiment is as follows:
for example, in some embodiments of the present invention, the method for improving the crack resistance of the hogging moment area of the steel-concrete composite beam bridge comprises: step S1: erecting a steel beam, and welding studs on the top surface of the flange of the steel beam; step S2: placing a reinforcing mesh on the top surface of the steel beam; step S3: in the extending direction of the reinforcing mesh, at least the outer side of the reinforcing steel bar at the position of the reinforcing mesh corresponding to the support is provided with a spacer; step S4: and (4) erecting a template, pouring common concrete at the position of the reinforcing mesh where the partition is not arranged, and pouring high-performance concrete at the position of the reinforcing mesh where the partition is arranged.
Example two:
the second embodiment is substantially the same as the first embodiment in terms of the method for improving the cracking resistance of the hogging moment area of the steel-concrete composite beam bridge, except that in the second embodiment, the method for improving the cracking resistance of the hogging moment area of the steel-concrete composite beam bridge comprises the steps of pouring the common concrete at the position of the reinforcing mesh where the partition is not arranged, arranging the partition, and pouring the high-performance concrete at the position of the reinforcing mesh where the partition is arranged.
Further, the isolation piece is a material piece with low elastic modulus, and the elastic modulus of the isolation piece is lower than that of the common concrete or that of the high-performance concrete. For example, in some embodiments of the invention, the spacer may be a low modulus of elasticity material and the modulus of elasticity of the spacer may be lower than that of ordinary concrete. In some embodiments of the invention, the spacer may be a low modulus of elasticity material and the modulus of elasticity of the spacer may be lower than the modulus of elasticity of high performance concrete.
In some embodiments of the invention, the spacer is a rubber or polyethylene-based plastic. For example, in some embodiments of the present invention, the spacer may be a rubber member such as a high performance rubber member or the like; in some embodiments of the present invention, the spacer may also be a polyethylene-based plastic.
For example, in some embodiments of the invention, the modulus of elasticity of the spacer may be much lower than that of ordinary concrete or that of high performance concrete. In some embodiments of the present invention, the elastic modulus of the concrete is approximately 30GPa, and the elastic modulus of the spacer (e.g., rubber member) is approximately 0.01GPa, but the present invention is not limited thereto.
Wherein the spacer is configured in the shape of a sleeve, an opening extending along the axial direction and penetrating through the sleeve along the thickness direction of the sleeve is formed on the sleeve, and the sleeve is suitable for being buckled on the outer side of the steel bar through the opening.
For example, in some embodiments of the present invention, the spacer may be a one-piece structure, the spacer may be configured in the shape of a sleeve, the sleeve may be formed with an opening, the opening may extend in an axial direction of the sleeve, and the opening may be disposed through the sleeve in a thickness direction of the sleeve, and the sleeve may be adapted to be fastened to an outer side of the reinforcing bar through the opening.
Of course, the present invention is not limited thereto, and in some alternative embodiments of the present invention, the spacer includes a first sub spacer and a second sub spacer, and the first sub spacer and the second sub spacer are respectively sleeved on the outer sides of the reinforcing bars and fixed by a band member.
For example, in some embodiments, the spacer may have a split structure, the spacer may include a first sub spacer and a second sub spacer, the first sub spacer and the second sub spacer are respectively sleeved on the outer sides of the reinforcing bars, and the first sub spacer and the second sub spacer may be fixed by a band member. Therefore, the first sub-isolator and the second sub-isolator can be fixed on the outer side of the steel bar through the strip-shaped component, and the reliability is good.
Wherein the band-shaped member may be, for example, an adhesive tape, a string, or the like.
For example, in some embodiments of the present invention, the first sub-spacer and the second sub-spacer may have symmetrical structures, for example, the first sub-spacer and the second sub-spacer may have the same structure; of course, in some embodiments of the present invention, the first sub-spacer and the second sub-spacer may also be disposed asymmetrically, and the present invention is not limited to this.
Of course, in some alternative embodiments of the present invention, the spacer is a rubber or plastic layer wound around the outside of the steel bars. For example, in some embodiments of the invention, the spacer may be a layer of rubber or plastic wound around the outside of the rebar. The rubber member layer or the plastic member layer may include one or more turns wound around the outer side of the reinforcing bar, and the present invention is not particularly limited thereto.
Compared with the prior art, the invention has the following advantages:
firstly, through the new thinking of 'anti-releasing combination' and 'making the best of things', the bonding between the reinforcing steel bar and the concrete (such as high-performance concrete) is locally damaged, the force transmission between the reinforcing steel bar and the concrete is cut off, so that the reinforcing steel bar is uniformly stressed and becomes the main bearing part of the tensile force, meanwhile, the internal tensile force is not transmitted to the concrete, the deformation of the concrete is restrained, and the stress of the concrete is greatly reduced.
Secondly, high-performance concrete with higher tensile strength is used at the position of the reinforcing mesh where the isolating piece is arranged, so that the anti-cracking performance is improved, and meanwhile, the local high-performance concrete does not have overlarge influence on the manufacturing cost.
Thirdly, the low elastic modulus material's separator low price, does not need too much extra work during the construction, easily guarantees the engineering quality.
Fourthly, compare in traditional steel reinforced concrete composite beam, the atress performance is superior, and simple structure can not produce too much influence to construction, cost etc. when promoting the performance.
The method for improving the cracking resistance of the hogging moment area of the steel-concrete composite beam bridge according to the embodiment of the second aspect of the invention belongs to the field of bridge engineering. The method for improving the anti-cracking performance of the hogging moment area of the steel-concrete combined beam bridge comprises the following key steps: firstly, erecting a steel beam, welding studs on the top of the flange of the steel beam, placing a reinforcing mesh, and pouring common concrete at the position of the reinforcing mesh where the partition is not arranged. And arranging the spacer made of the low elastic modulus material on the steel bars with certain length at the position of the steel bar mesh where the spacer is arranged, and pouring high-performance concrete with higher tensile strength.
According to the method for improving the cracking resistance of the hogging moment region of the steel-concrete combined beam bridge, which is disclosed by the embodiment of the second aspect of the invention, a new concept of 'release combination resistance' and 'best use of things' is adopted, the concrete and the steel bars are separated at the positions of the steel bar nets, where the separators are arranged, the steel bars are used as main bearing parts of tensile force, and the stress of the steel bars cannot be transmitted to the concrete, so that the tensile stress in the concrete is reduced, and in addition, high-performance concrete with higher tensile strength is selected at places with higher tensile stress of the concrete, the cracking resistance of the hogging moment region of the combined beam is improved.
The method for improving the cracking resistance of the hogging moment area of the steel-concrete composite beam bridge, provided by the embodiment of the invention, has the advantages of simple structure, convenience in construction and good technical and economic benefits.
Other constructions and operations of the structure 100 and the method for improving the crack resistance of the hogging moment region of the steel-concrete composite beam bridge according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The utility model provides a promote structure of steel-concrete composite beam bridge hogging moment district crack resistance can, promote structure of steel-concrete composite beam bridge hogging moment district crack resistance can include the support, steel-concrete composite beam bridge has the hogging moment district, its characterized in that, promote structure of steel-concrete composite beam bridge hogging moment district crack resistance can include:
the steel beam is arranged on the support and provided with a flange extending along the horizontal direction, and a stud is welded on the flange positioned at the top;
a mesh reinforcement disposed over the steel beam, the mesh reinforcement having reinforcing bars extending in a horizontal direction;
the separator is arranged on the outer side of the steel bar at the position of the steel bar mesh corresponding to the support in the extending direction of the steel bar mesh;
ordinary concrete poured at a position of the reinforcing mesh where the spacer is not provided;
high-performance concrete poured at a position of the reinforcing mesh where the spacer is provided.
2. The structure for improving the crack resistance of the hogging moment area of the steel-concrete composite beam bridge of claim 1, wherein the isolation member is a material member with low elastic modulus, and the elastic modulus of the isolation member is lower than that of the ordinary concrete or that of the high-performance concrete.
3. The structure for improving the crack resistance of the hogging moment area of the steel-concrete composite beam bridge as claimed in claim 2, wherein the isolation member is a rubber member or a polyethylene plastic member.
4. The structure for improving the hogging moment zone cracking resistance of a steel-concrete composite beam bridge of claim 3, wherein the spacer is configured in the shape of a sleeve, and an opening extending in the axial direction and penetrating through the sleeve in the thickness direction of the sleeve is formed on the sleeve, and the sleeve is adapted to be fastened to the outer side of the steel bar through the opening.
5. The structure for improving the crack resistance of the hogging moment area of the steel-concrete composite beam bridge as claimed in claim 3, wherein the partition comprises a first sub partition and a second sub partition, and the first sub partition and the second sub partition are respectively sleeved on the outer sides of the steel bars and fixed by a band-shaped member.
6. The structure for improving the crack resistance of the hogging moment area of the steel-concrete composite beam bridge as claimed in claim 3, wherein the spacer is a rubber or plastic layer wound on the outer side of the steel bar.
7. The structure for improving the crack resistance of the hogging moment area of the steel-concrete composite beam bridge of any one of claims 1-6, wherein the tensile strength of the high-performance concrete is higher than that of the ordinary concrete, and the high-performance concrete comprises one of UHPC and ECC.
8. A method for improving the hogging moment zone crack resistance of a steel-concrete composite beam bridge according to any one of claims 1-7, which comprises the following steps:
step S1: erecting a steel beam, and welding studs on the top surface of the flange of the steel beam;
step S2: placing a reinforcing mesh on the top surface of the steel beam;
step S3: in the extending direction of the reinforcing mesh, at least the outer side of the reinforcing steel bar at the position of the reinforcing mesh corresponding to the support is provided with a spacer;
step S4: building a template, pouring common concrete at the position of the reinforcing mesh where the isolating piece is not arranged, and pouring high-performance concrete at the position of the reinforcing mesh where the isolating piece is arranged;
wherein the tensile strength of the high-performance concrete is higher than that of ordinary concrete, and the high-performance concrete comprises one of UHPC and ECC;
the steps S3 and S4 may be changed as follows: and firstly pouring common concrete at the position of the reinforcing mesh where the isolator is not arranged, then arranging the isolator, and finally pouring high-performance concrete at the position of the reinforcing mesh where the isolator is arranged.
9. The method for improving the crack resistance of the hogging moment area of the steel-concrete composite beam bridge of claim 8, wherein the isolator is a material with low elastic modulus, and the elastic modulus of the isolator is lower than that of the ordinary concrete or that of the high-performance concrete.
10. The method for improving the crack resistance of the hogging moment area of the steel-concrete composite beam bridge of claim 9, wherein the isolation member is a rubber member or a polyethylene-based plastic member,
wherein the spacer is configured in the shape of a sleeve, an opening extending along the axial direction and penetrating through the sleeve along the thickness direction of the sleeve is formed on the sleeve, and the sleeve is suitable for being buckled on the outer side of the steel bar through the opening; alternatively, the first and second electrodes may be,
the partition comprises a first sub-partition and a second sub-partition, and the first sub-partition and the second sub-partition are respectively sleeved on the outer side of the steel bar and fixed by a strip-shaped part; alternatively, the first and second electrodes may be,
the isolating piece is a rubber piece layer or a plastic piece layer wound on the outer side of the steel bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010049127.8A CN111139740A (en) | 2020-01-16 | 2020-01-16 | Structure and method for improving cracking resistance of hogging moment area of steel-concrete composite beam bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010049127.8A CN111139740A (en) | 2020-01-16 | 2020-01-16 | Structure and method for improving cracking resistance of hogging moment area of steel-concrete composite beam bridge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111139740A true CN111139740A (en) | 2020-05-12 |
Family
ID=70525521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010049127.8A Pending CN111139740A (en) | 2020-01-16 | 2020-01-16 | Structure and method for improving cracking resistance of hogging moment area of steel-concrete composite beam bridge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111139740A (en) |
-
2020
- 2020-01-16 CN CN202010049127.8A patent/CN111139740A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20120124937A1 (en) | Hybrid frp-concrete-steel double-skin tubular beams and hybrid dstb/slab units using the beams | |
| Teng et al. | Behavior of hybrid FRP-concrete-steel double-skin tubular columns | |
| CN206385460U (en) | Combined floorings | |
| US8544129B2 (en) | Composite girder for bridge construction | |
| CN102121289B (en) | Ultrahigh-strength and ultrathin bottom board for laminated slab and production method thereof | |
| CN107217788A (en) | Full FRP muscle enhancing ECC Combined concrete beams and preparation method thereof | |
| CN101793070A (en) | Hollow floor system filled with an air-filling bag and construction method thereof | |
| CN101328751A (en) | Fiber composite material steel reinforced concrete structure | |
| CN107245947A (en) | A kind of reinforced concrete structure containing early-strength ultra-high performance concrete | |
| CN201972287U (en) | Ultrathin bottom plate with superhigh strength for lamination board | |
| KR101104613B1 (en) | Reinforcing method of concrete structures using fiber composites for reinforcing | |
| CN208718220U (en) | A kind of profile steel concrete column using GFRP tendons | |
| CN212103669U (en) | Structure for improving cracking resistance of hogging moment area of steel-concrete combined beam bridge | |
| CN111139740A (en) | Structure and method for improving cracking resistance of hogging moment area of steel-concrete composite beam bridge | |
| CN108824695B (en) | FRP rib concrete beam with ductility and preparation method thereof | |
| CN110886191A (en) | Prestressed concrete-steel composite beam and preparation method thereof | |
| CN212104517U (en) | Structure for improving crack resistance of joint area of prefabricated reinforced concrete beam slab | |
| KR101328837B1 (en) | Reinforced concrete pontoons lugs and skeletal | |
| CN216919967U (en) | NC-UHPC combined assembly type concrete box girder and bridge thereof | |
| CN111139934A (en) | Structure and method for improving crack resistance of joint area of prefabricated reinforced concrete beam slab | |
| CN209907232U (en) | Sandwich type top and bottom plate shear-strengthening concrete slab beam structure | |
| JP2558100B2 (en) | Hybrid type fiber reinforced lightweight concrete structure | |
| JP2013256788A (en) | Structure body and lining method using fiber-reinforced cementitious composite with multiple fine cracks | |
| CN207958968U (en) | A kind of ultra-high performance concrete and regular reinforcement concrete combination beam | |
| KR100980797B1 (en) | Structure reinfocing method using hybrid reinforced member |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |