CN112854811A - Reinforced concrete beam - Google Patents
Reinforced concrete beam Download PDFInfo
- Publication number
- CN112854811A CN112854811A CN202110271232.0A CN202110271232A CN112854811A CN 112854811 A CN112854811 A CN 112854811A CN 202110271232 A CN202110271232 A CN 202110271232A CN 112854811 A CN112854811 A CN 112854811A
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- reinforced concrete
- steel sheet
- notch
- concrete beam
- steel plate
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- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 115
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 116
- 239000010959 steel Substances 0.000 claims abstract description 116
- 230000002787 reinforcement Effects 0.000 claims description 9
- 230000000149 penetrating effect Effects 0.000 claims description 8
- 210000003141 lower extremity Anatomy 0.000 claims description 2
- 238000005452 bending Methods 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 8
- 238000010008 shearing Methods 0.000 abstract description 5
- 239000004567 concrete Substances 0.000 description 9
- 230000003014 reinforcing effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
The invention discloses a reinforced concrete beam reinforced by a beam side steel plate pasting method, and further discloses the shape and structural characteristics of a steel plate. Two relative side surface outsides of reinforced concrete roof beam all are connected with the steel sheet, the length and the height that highly equals the reinforced concrete roof beam of steel sheet, and the length edge of steel sheet aligns the length edge of reinforced concrete roof beam, and the high edge of steel sheet aligns the high edge of reinforced concrete roof beam, and the top edge of steel sheet is opened has first notch for the steel sheet is the character cut in bas-relief. The invention adopts the steel plate to reinforce the reinforced concrete beam, optimizes the structural shape of the reinforced steel plate, can effectively and reasonably bear bending moment and shearing force, and reduces the dead weight of the steel plate reinforced beam.
Description
Technical Field
The invention mainly relates to a reinforced concrete beam reinforced by a beam side steel plate pasting method, in particular to the shape and the connection structure of side pasting steel plates, and belongs to the field of building structures.
Background
The method for attaching the steel plate to the side of the beam is a reinforcing method for the reinforced concrete beam, the reinforced concrete beam after being reinforced is obviously changed in the aspects of force and displacement relation, stress, concrete damage and the like, but the shape, the covering position and the connecting structure of the steel plate of the reinforced concrete beam are lack of research at present, and the reinforcing method is usually implemented by adopting a mode that the steel plate covers the surface of the whole reinforced concrete beam.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a reinforced concrete beam reinforced by a beam side steel plate pasting method, which adopts a steel plate to reinforce the reinforced concrete beam, optimizes the structural shape of the reinforced steel plate, can effectively and reasonably bear bending moment and shearing force, and simultaneously reduces the dead weight of the steel plate reinforced beam.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a reinforced concrete roof beam, two relative side surface outsides of reinforced concrete roof beam all are connected with the steel sheet, the length and the height that highly equal reinforced concrete roof beam of steel sheet, and the length edge of steel sheet aligns the length edge of reinforced concrete roof beam, and the high edge of highly aligning reinforced concrete roof beam of steel sheet has first notch to open at the top edge of steel sheet for the steel sheet is character cut in bas-relief.
Furthermore, the two steel plates are tightly attached to the side surface of the reinforced concrete beam through the connecting fastener.
Furthermore, the connecting fasteners are a plurality of rod pieces penetrating through two opposite side surfaces of the reinforced concrete beam, and locking structures are arranged at two ends of each rod piece.
Furthermore, the steel plate reinforced concrete beam further comprises a through hole, wherein the through hole is composed of a first through hole penetrating through two opposite side surfaces of the reinforced concrete beam and a second through hole penetrating through the thickness direction of the steel plate, and the second through hole is not intersected with the first notch;
and the two steel plates are pressed on the side surface of the reinforced concrete beam through the connecting fastener which is simultaneously inserted into the first through hole and the second through hole.
Preferably, an adhesive layer, such as glue, is applied between the steel plate and the side surface of the reinforced concrete beam to improve the coupling property of the steel plate and the side surface of the reinforced concrete beam so that they can be integrally formed.
Further, still include an at least lacing wire among the above-mentioned scheme, the lacing wire is on a parallel with the length direction of reinforced concrete roof beam, and the lacing wire is located the region between first notch and the steel sheet lower limb, the both ends and the connecting fastener fixed connection of lacing wire.
Preferably, the tie bars are of unequal lengths, but the shortest length is greater than the length of the first slot.
Furthermore, still include the second notch among the above-mentioned scheme, it is a plurality of the second notch is parallel, the interval arrangement is on the steel sheet, and the second notch is located the both sides of first notch.
Furthermore, the reinforced concrete beam comprises longitudinal stressed main reinforcements arranged along the length direction of the reinforced concrete beam and stirrups arranged at intervals along the longitudinal stressed main reinforcements.
Further, still include the second notch among the above-mentioned scheme, it is a plurality of the second notch is parallel, interval arrangement is on the steel sheet, and the second notch is located the both sides of first notch, and the interval between two adjacent second notches equals the interval between the adjacent stirrup.
Preferably, the height of the second notch is smaller than the height of the first notch.
Preferably, the steel plates are different-thickness steel plates, and the thickness of the steel plates at the positions with the maximum bending moment and the maximum shearing force of the reinforced concrete beam is larger than that of the steel plates at other positions.
The reinforced concrete beam is a beam with a uniform cross section, the two opposite side surfaces of the reinforced concrete beam are connected with steel plates, the length and the height of each steel plate are equal to those of the reinforced concrete beam, the length edge of each steel plate is aligned to the length edge of the reinforced concrete beam, the height edge of each steel plate is aligned to the height edge of the reinforced concrete beam, and the upper edge of each steel plate is provided with a first notch, so that the steel plates are in a concave shape, and the distance from the left end of each first notch to the left end of the reinforced concrete beam is equal to the distance from the right end of each first notch to the right end of the reinforced concrete beam.
The side-mounted steel plate reinforcing structure solves the later reinforcing problem of the reinforced concrete beam, changes the bending resistance and the shearing resistance of the beam when bearing load by adding the steel plates on the side surfaces of the beam, changes the section shape of the beam while reducing weight by arranging the notches at different positions of the steel plates, and particularly adjusts the maximum bending moment and the maximum shearing force correspondingly.
Because the reinforced concrete beam is easy to crack and damage at the bent bottom, the reinforcing steel plate is reinforced, the lacing wires at corresponding positions are added, and the bending resistance is improved.
It should be noted that the opening direction of the first notch in the present invention is determined according to the position of the load, on the premise that the upper end surface of the reinforced concrete beam bears the load, and the purpose of the opening direction of the first notch is to ensure that the steel bar at the position bearing the maximum bending moment in the reinforced concrete beam is reinforced by the steel plate while reducing the weight, and the position without the stirrup in the reinforced concrete beam is also reinforced by the steel plate.
Compared with the prior art, the reinforced concrete beam reinforced by the side-mounted steel plate has the following characteristics:
(1) the reinforced concrete beam has good reinforcing effect, the bearing capacity of the reinforced concrete beam is obviously improved, and compared with the common reinforced concrete beam, the reinforced concrete beam reinforced by the side-mounted steel plate has smaller tensile damage range.
(2) According to the stress characteristics of the reinforced concrete beam, the first notch is formed in the side-pasting steel plate, so that the side-pasting steel plate does not completely cover the side surface of the reinforced concrete beam, the dead weight of the reinforced structure is reduced, and the bending moment resistance of the steel plate below the first notch is fully exerted.
(3) The side-mounted steel plate can obviously increase the stress intensity of the reinforced concrete beam.
(4) According to the characteristics that when the simply supported beam is subjected to the action of concentrated force at a symmetrical point, the bending moment borne by the beam is large in the middle and small at two ends, at the moment, the bending moment action is mainly resisted by longitudinal steel bars at the bottom of the reinforced concrete beam, so that the steel plate is provided with a first notch (in a concave shape), the bending resistance is optimized, the waste of materials is avoided, and the self weight of the beam body after being reinforced is reduced; the shear force that the roof beam receives reflects that both ends are big, middle little characteristic, and the shear force effect is resisted by the stirrup, and the steel sheet between the second notch plays the effect of resisting the shear force, and the second notch alleviates the roof beam body dead weight when avoiding the material extravagant. Even if the asymmetric load is born by the simply supported beam, the positions of the first notch and the second notch can be set according to the same conception, and meanwhile, the corresponding lacing wires are matched.
(5) The two ends of the connecting fasteners are provided with holes for fixedly connecting the tie bars, and the tie bars with different lengths are arranged, for example, when the tie bars are two, the two connecting fasteners with smaller space are connected by adopting the steel bars as the tie bars, the two connecting fasteners with larger space are connected by adopting the steel bars as the tie bars, the two tie bars are used for resisting bending moment, and the cracking of the concrete at the bottom of the beam is controlled and slowed down.
Drawings
FIG. 1 is a schematic structural view of a conventional reinforced concrete beam without side-mounted steel plate reinforcement;
FIG. 2 is a schematic view of a reinforced concrete beam reinforced with side-mounted steel plates;
FIG. 3 is a schematic view of a reinforced concrete beam reinforced with side-mounted steel plates and connected to the steel plates at two sides by a connecting member, in which connection holes of the connecting member are shown;
FIG. 4 is a schematic view showing a reinforced concrete beam structure reinforced with side-mounted steel plates of the connecting member;
FIG. 5 is a schematic cross-sectional view A-A of FIG. 1;
FIG. 6 is a schematic cross-sectional view B-B of FIGS. 2, 3 and 4;
FIG. 7 is a schematic cross-sectional view C-C of FIGS. 2, 3 and 4;
FIG. 8 is a schematic cross-sectional view taken along line D-D of FIGS. 3 and 4;
FIG. 9 is a graph illustrating a tensile damage analysis of concrete loaded on a conventional reinforced concrete beam without side-mounted steel plate reinforcement;
fig. 10 is a graph illustrating a tensile damage analysis of concrete after a reinforced concrete beam reinforced with side-mounted steel plates is loaded.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter of the present invention is limited to the following embodiments, and various modifications, substitutions and alterations made based on the common technical knowledge and conventional means in the art without departing from the technical idea of the present invention are included in the scope of the present invention.
As shown in fig. 1, the conventional unreinforced Concrete Beam (RCB) is an unreinforced Concrete Beam, and the internal reinforcement arrangement is shown in a section a-a in fig. 4.
As shown in fig. 2 to 8, the Reinforced Concrete Beam Reinforced with the Side-mounted steel plate 1 according to the present embodiment is a Reinforced Concrete Beam Reinforced with Reinforced Side-mounted Reinforced Concrete Beam (SSRCB). According to the principle that when a simple support beam is subjected to concentrated force at trisection points, bending moment applied to the beam is large in the middle, small at two ends and zero in the middle (in a pure bending state), the steel plate 1 for reinforcing the reinforced concrete beam by laterally attaching the steel plate 1 is designed to be a groove shape. The method specifically comprises the following steps: on the basis of a common reinforced concrete beam, a method of sticking steel plates 1 on two sides of the longitudinal section of the beam is adopted, two end parts of each steel plate 1 are designed to be fully paved along the longitudinal surface of the beam, the height of each steel plate is flush with the height of the beam, the middle part of each steel plate 1 is designed to be covered only along the bottom of the beam, and the height of each steel plate is 1/3 of the height of the beam.
Specifically, the reinforced concrete beam is a rectangular beam with equal cross section, the reinforced concrete beam comprises longitudinal stress main reinforcements arranged along the length direction of the reinforced concrete beam and stirrups arranged at intervals along the longitudinal stress main reinforcements, the outer sides of two opposite side surfaces of the reinforced concrete beam are both connected with steel plates 1, the length and the height of each steel plate 1 are equal to the length and the height of the reinforced concrete beam, the length edge of each steel plate 1 is aligned with the length edge of the reinforced concrete beam, the height edge of each steel plate 1 is aligned with the height edge of the reinforced concrete beam, the upper edge of each steel plate 1 is provided with a first notch 2, so that each steel plate 1 is in a concave shape, the length of each first notch 2 is equal to one third of the length of the reinforced concrete beam, the height of each first notch 2 is equal to two thirds of the height of the reinforced concrete beam, and the left end and the right end of each first notch 2 are respectively located at, that is, the distance from the left end of the first notch 2 to the left end of the reinforced concrete beam is equal to 1/3 the length of the reinforced concrete beam, similarly, the distance from the right end of the first notch 2 to the right end of the reinforced concrete beam is equal to 1/3 the length of the reinforced concrete beam, and the height of the steel plate 1 below the first notch 2 is 1/3 the height of the reinforced concrete beam.
As shown in fig. 9 and 10, the failure analysis of the reinforced concrete beam was numerically simulated after the side attachment steel plate 1 was not provided and the side attachment steel plate 1 was provided. Compared with the ordinary reinforced concrete beam RCB which is not reinforced, the reinforced concrete beam SSRCB which is reinforced by the side-mounted steel plate 1 has the advantages that the concrete damage range is smaller than that of the ordinary reinforced concrete beam which is not reinforced on the whole, especially the damage degree of midspan concrete upwards and the spread degree of midspan damage to both sides are far smaller than that of the ordinary reinforced concrete beam which is not reinforced, and the good effect of the side-mounted steel plate 1 on reducing concrete damage is further explained.
Further, the reinforced concrete beam further comprises second notches 3 formed in the surface of the steel plate 1 at intervals, the second notches 3 are located on two sides of the first notches 2, and the distance between every two adjacent second notches 3 is equal to the distance between every two adjacent stirrups. The height of the second notch 3 is smaller than the height of the first notch 2. The reinforced concrete beam is also provided with a through hole 4 and a connecting fastener, the through hole 4 consists of a first through hole penetrating through two opposite side surfaces of the reinforced concrete beam and a second through hole penetrating through the thickness direction of the steel plate 1, and the second through hole is not intersected with the first notch 2 and the second notch 3; the connecting fastener penetrates through the first through hole and the second through hole simultaneously and then compresses the steel plate 1 on two opposite side surfaces of the reinforced concrete beam, as shown in fig. 3, 4, 7 and 8, the connecting fastener is inserted into the through hole 4 to be connected with and compress the steel plate 1 on two sides, the connecting fastener is a rod piece with threads and through holes at two ends, the steel plate 1 is compressed through a locking nut, as shown in fig. 4, two tie bars 5 with different lengths are arranged in an area between the lower edge of the steel plate 1 and the lower edge of a first notch 2 of the steel plate 1, two ends of each tie bar 5 are respectively connected with the through hole of the connecting fastener, and the through hole 4 of the upper edge accessory of the steel plate 1 in fig. 4 is only used for inserting the connecting fastener.
Claims (10)
1. A reinforced concrete beam, characterized in that: two relative side surface outsides of reinforced concrete roof beam all are connected with steel sheet (1), the length and the height that highly equal reinforced concrete roof beam of steel sheet (1), and the length edge of steel sheet (1) aligns the length edge of reinforced concrete roof beam, and the high edge of steel sheet (1) aligns the high edge of reinforced concrete roof beam, and the top edge of steel sheet (1) is opened has first notch (2) for steel sheet (1) is the character cut in bas-relief.
2. A reinforced concrete beam as claimed in claim 1, wherein: the two steel plates (1) are tightly attached to the side surface of the reinforced concrete beam through connecting fasteners.
3. A reinforced concrete beam as claimed in claim 2, wherein: the connecting fasteners are a plurality of rod pieces penetrating through two opposite side surfaces of the reinforced concrete beam, and locking structures are arranged at two ends of each rod piece.
4. A reinforced concrete beam as claimed in claim 3, wherein: the steel plate reinforced concrete beam is characterized by further comprising a through hole (4), wherein the through hole (4) is composed of a first through hole penetrating through two opposite side surfaces of the reinforced concrete beam and a second through hole penetrating through the thickness direction of the steel plate (1), and the second through hole is not intersected with the first notch (2);
and the two steel plates (1) are pressed on the side surface of the reinforced concrete beam through connecting fasteners which are simultaneously inserted into the first through holes and the second through holes.
5. A reinforced concrete beam according to claim 4, wherein: still include an at least lacing wire (5), lacing wire (5) are on a parallel with reinforced concrete beam's length direction, and lacing wire (5) are located the region between first notch (2) and steel sheet (1) lower limb, the both ends and the connecting fastener fixed connection of lacing wire (5).
6. A reinforced concrete beam as claimed in claim 1, wherein: the steel plate is characterized by further comprising second notches (3), wherein the second notches (3) are arranged on the steel plate (1) in parallel at intervals, and the second notches (3) are located on two sides of the first notches (2).
7. A reinforced concrete beam as claimed in claim 1, wherein: the reinforced concrete beam comprises longitudinal stressed main reinforcements arranged along the length direction of the reinforced concrete beam and stirrups arranged at intervals along the longitudinal stressed main reinforcements.
8. A reinforced concrete beam as claimed in claim 7, wherein: still include second notch (3), it is a plurality of second notch (3) are parallel, the interval arrangement is on steel sheet (1), and second notch (3) are located the both sides of first notch (2), and the interval between two adjacent second notches (3) equals the interval between the adjacent stirrup.
9. A reinforced concrete beam as claimed in claim 8, wherein: the height of the second notch (3) is smaller than that of the first notch (2).
10. A reinforced concrete beam as claimed in claim 1, wherein: the reinforced concrete roof beam is for waiting the cross-section roof beam, and two relative side surface outsides of reinforced concrete roof beam all are connected with steel sheet (1), the length and the height that highly equals the reinforced concrete roof beam of steel sheet (1), and the length edge of the length edge alignment reinforced concrete roof beam of steel sheet (1), the high edge alignment reinforced concrete roof beam of steel sheet (1) highly marginal, the top edge of steel sheet (1) is opened has first notch (2) for steel sheet (1) is character cut in bas-relief, the left end of first notch (2) equals the distance of the right-hand member of first notch (2) to the right-hand member of reinforced concrete roof beam to the distance of the left end of reinforced concrete roof beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110271232.0A CN112854811A (en) | 2021-03-12 | 2021-03-12 | Reinforced concrete beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110271232.0A CN112854811A (en) | 2021-03-12 | 2021-03-12 | Reinforced concrete beam |
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| Publication Number | Publication Date |
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| CN112854811A true CN112854811A (en) | 2021-05-28 |
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| CN202110271232.0A Pending CN112854811A (en) | 2021-03-12 | 2021-03-12 | Reinforced concrete beam |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002357001A (en) * | 2001-05-30 | 2002-12-13 | Chishin Go | Method for reinforcing structure |
| CN102561719A (en) * | 2011-12-29 | 2012-07-11 | 吉林建筑工程学院 | Reinforced concrete beam reinforced by bonding steel plate |
| CN103306493A (en) * | 2013-05-29 | 2013-09-18 | 叶香竹 | Method for reinforcing building structure |
| JP2016008387A (en) * | 2014-06-23 | 2016-01-18 | 株式会社フジタ | Hybrid beam |
| CN109972538A (en) * | 2019-05-07 | 2019-07-05 | 南京林业大学 | A kind of steel plate is interior to fill filler material composite reinforcement concrete bridge structure and construction technology |
| CN214885777U (en) * | 2021-03-12 | 2021-11-26 | 南宁学院 | Reinforced concrete beam |
-
2021
- 2021-03-12 CN CN202110271232.0A patent/CN112854811A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002357001A (en) * | 2001-05-30 | 2002-12-13 | Chishin Go | Method for reinforcing structure |
| CN102561719A (en) * | 2011-12-29 | 2012-07-11 | 吉林建筑工程学院 | Reinforced concrete beam reinforced by bonding steel plate |
| CN103306493A (en) * | 2013-05-29 | 2013-09-18 | 叶香竹 | Method for reinforcing building structure |
| JP2016008387A (en) * | 2014-06-23 | 2016-01-18 | 株式会社フジタ | Hybrid beam |
| CN109972538A (en) * | 2019-05-07 | 2019-07-05 | 南京林业大学 | A kind of steel plate is interior to fill filler material composite reinforcement concrete bridge structure and construction technology |
| CN214885777U (en) * | 2021-03-12 | 2021-11-26 | 南宁学院 | Reinforced concrete beam |
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