CN112854811B - A reinforced concrete beam - Google Patents
A reinforced concrete beam Download PDFInfo
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- CN112854811B CN112854811B CN202110271232.0A CN202110271232A CN112854811B CN 112854811 B CN112854811 B CN 112854811B CN 202110271232 A CN202110271232 A CN 202110271232A CN 112854811 B CN112854811 B CN 112854811B
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- reinforced concrete
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- 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
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- 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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Abstract
本发明公开了一种梁侧贴钢板法加固的钢筋混凝土梁，并进一步公开了钢板的形状和结构特点。钢筋混凝土梁的两个相对的侧表面外侧均连接有钢板，钢板的长度和高度等于钢筋混凝土梁的长度和高度，且钢板的长度边缘对齐钢筋混凝土梁的长度边缘，钢板的高度边缘对齐钢筋混凝土梁的高度边缘，钢板的上边缘开有第一槽口，使得钢板呈凹字形。本发明采用钢板加固钢筋混凝土梁的同时，优化了加固钢板的结构形状，能够有效、合理的承受弯矩、剪力，降低了钢板加固梁的自重。
The present invention discloses a reinforced concrete beam reinforced by a method of attaching a steel plate to the side of the beam, and further discloses the shape and structural features of the steel plate. Steel plates are connected to the outer sides of the two opposite side surfaces of the reinforced concrete beam, the length and height of the steel plates are equal to the length and height of the reinforced concrete beam, and the length edge of the steel plate is aligned with the length edge of the reinforced concrete beam, the height edge of the steel plate is aligned with the height edge of the reinforced concrete beam, and a first notch is opened on the upper edge of the steel plate, so that the steel plate is concave. While the present invention uses steel plates to reinforce reinforced concrete beams, it optimizes the structural shape of the reinforced steel plates, can effectively and reasonably withstand bending moments and shear forces, and reduces the deadweight of the steel plate reinforced beam.
Description
Technical Field
The invention mainly relates to a reinforced concrete beam reinforced by adopting a beam side-attached steel plate method, in particular to a shape and a connecting structure of a side-attached steel plate, and belongs to the field of building structures.
Background
The beam side attaching steel plate method is a reinforced concrete beam reinforcing method, the reinforced concrete beam after reinforcement has obvious changes in the aspects of force and displacement relation, stress, concrete damage and the like, but the shape, the covering position and the connection structure of the steel plate of the reinforced steel plate are not researched at present, and the steel plate is generally used for reinforcing in a mode of covering the whole reinforced concrete beam surface.
Disclosure of Invention
In order to solve the problems, the invention aims to provide the reinforced concrete beam reinforced by the beam side-attached steel plate method, the steel plate is adopted to reinforce the reinforced concrete beam, the structural shape of the reinforced steel plate is optimized, the bending moment and the shearing force can be effectively and reasonably born, and the dead weight of the steel plate reinforced beam is reduced.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a reinforced concrete roof beam, the two opposite side surfaces outside of reinforced concrete roof beam all is connected with the steel sheet, the length and the height of steel sheet equal to the length and the height of reinforced concrete roof beam, and the length edge of steel sheet aligns the length edge of reinforced concrete roof beam, and the height edge of steel sheet aligns the height edge of reinforced concrete roof beam, and open the upper edge of steel sheet has first notch for the steel sheet is the character of 'kou'.
Further, the two steel plates are tightly attached to the side surfaces of the reinforced concrete beam through connecting fasteners.
Further, the connecting fastener is 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 the rod pieces.
Further, the scheme further comprises a through hole, wherein the through hole 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, and the second through hole is not intersected with the first notch;
The two steel plates are pressed on the side surfaces of the reinforced concrete beam through connecting fasteners which are simultaneously inserted into the first through holes and the second through holes.
Preferably, an adhesive layer, such as glue, is coated between the steel plate and the side surface of the reinforced concrete beam, so that the connection performance of the steel plate and the side surface of the reinforced concrete beam is improved, and the steel plate and the side surface of the reinforced concrete beam can be integrated.
Further, still include at least one lacing wire in 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 bar is unequal in length but has a shortest length greater than the length of the first slot.
Further, the scheme further comprises second notches, a plurality of second notches are arranged on the steel plate in parallel and at intervals, and the second notches are located on two sides of the first notches.
Further, 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 in above-mentioned scheme, a plurality of second notch is parallel, the 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 non-uniform thickness steel plates, and the thickness of the reinforced concrete beam at the position with the maximum bending moment and the maximum shearing force is larger than that of the reinforced concrete beam at other positions.
In particular, the reinforced concrete beam is a constant cross-section beam, steel plates are connected to the outer sides of two opposite side surfaces of the reinforced concrete beam, the length and the height of the steel plates are equal to those of the reinforced concrete beam, the length edges of the steel plates are aligned with the length edges of the reinforced concrete beam, the height edges of the steel plates are aligned with the height edges of the reinforced concrete beam, and the upper edges of the steel plates are provided with first notches, 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 each reinforced concrete beam is equal to the distance from the right end of each first notch to the right end of each reinforced concrete beam.
The side-attached steel plate reinforcing structure solves the problem of reinforcing the reinforced concrete beam in the later period, changes the bending resistance and the shearing resistance of the beam when bearing load by adding the steel plate on the side surface of the beam, reduces the weight by arranging the notch at different positions of the steel plate, and simultaneously changes the section shape of the beam, and particularly correspondingly adjusts the position with the maximum bending moment and the position with the maximum shearing force.
Because the reinforced concrete beam is easy to crack and break at the bottom of the bend, the steel plate is reinforced, the lacing wires at corresponding positions are added, and the bending resistance is improved.
The first notch opening direction is formed on the premise that the upper end face of the reinforced concrete beam bears the load, the specific opening direction of the first notch is determined according to the position of the load, the purpose of the first notch opening direction is to reduce weight, meanwhile, reinforcing of a steel plate is guaranteed to be obtained from a steel bar at the position of the reinforced concrete beam, which bears the biggest bending moment, and reinforcing of the steel plate is also obtained from a stirrup-free position of the reinforced concrete beam.
Compared with the prior art, the side-attached steel plate reinforced concrete beam 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 with the side-attached steel plates has smaller concrete tensile damage range.
(2) According to the stress characteristics of the reinforced concrete beam, the first notch is formed in the side-mounted steel plate, so that the side-mounted steel plate does not completely cover the side surface of the reinforced concrete beam, the self 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-attached steel plates can obviously increase the stress intensity of the reinforced concrete beam.
(4) According to the characteristics that the bending moment of the simply supported beam is large in the middle and small in the two ends when the symmetrical points are acted by concentrated force, the bending moment is mainly acted by longitudinal steel bars at the bottom of the reinforced concrete beam, so that a first notch (concave shape) is formed in a design steel plate, the waste of materials is avoided while the bending resistance is optimized, the dead weight of the reinforced beam body is reduced, the shearing force of the beam is characterized that the two ends are large and the middle is small, the shearing force is acted by stirrups, the steel plate between the second notches plays a role of resisting the shearing force, and the dead weight of the beam body is reduced while the waste of materials is avoided by the second notch. Even if the simply supported beam bears asymmetric load, the positions of the first notch and the second notch can be set according to the same conception, and corresponding lacing wires are matched.
(5) The two ends of the connecting fasteners are provided with holes for fixedly connecting the lacing wires and arranging the lacing wires with different lengths, for example, when two lacing wires are arranged, the two connecting fasteners with smaller spacing are connected by adopting the reinforcing steel bars as the lacing wires, the two connecting fasteners with larger spacing are also connected by adopting the reinforcing steel bars as the lacing wires, the two lacing wires are used for resisting the 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 view of a general reinforced concrete beam structure without side-mounted steel plate reinforcement;
fig. 2 is a schematic view of a reinforced concrete beam reinforced by side-mounted steel plates;
FIG. 3 is a schematic view of a reinforced concrete beam reinforced by side-mounted steel plates and connected to the steel plates at both sides by connectors, showing the connection holes of the connectors;
fig. 4 is a schematic view showing the structure of a reinforced concrete beam reinforced by side-mounted steel plates of a connector;
FIG. 5 is a schematic view of section A-A of FIG. 1;
FIG. 6 is a schematic view in section B-B of FIGS. 2, 3 and 4;
FIG. 7 is a schematic view of section C-C of FIGS. 2, 3 and 4;
FIG. 8 is a schematic view of section D-D of FIGS. 3 and 4;
Fig. 9 is a view showing a tensile damage analysis of concrete after loading of a general reinforced concrete beam without reinforcement of a side-attached steel plate;
fig. 10 is a diagram showing a tensile damage analysis of concrete after loading a reinforced concrete beam reinforced with a side-mounted steel plate.
Detailed Description
The present invention will be further described with reference to the drawings and the specific embodiments, but it should not be construed that the scope of the subject matter of the present invention is limited to the following embodiments, and various modifications, substitutions and alterations made according to the ordinary skill and familiar means of the art to which this invention pertains are included within the scope of the present invention without departing from the above technical idea of the invention.
As shown in fig. 1, the conventional unreinforced general reinforced concrete beam Reinforced Concrete Beam (RCB) has an internal reinforcement structure as shown in a section A-A of fig. 4.
As shown in fig. 2 to 8, the reinforced concrete beam STICKED SIDE to plated Reinforced Concrete Beam (SSRCB) reinforced by the side-mounted steel plate 1 in this embodiment is shown. In the following, a rectangular beam with a uniform cross section is taken as an example, and according to the principle that when a simply supported beam is acted by concentrated force at three equal division points, the bending moment of the beam is reflected to be large at the middle and small at the two ends, the shearing force is reflected to be large at the two ends and zero in the middle (in a pure bending state), the steel plate 1 of the reinforced concrete beam reinforced by the side-attached steel plate 1 is designed to be a groove. The method is characterized in that 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 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 rectangular equal cross-section beam, including the longitudinal stress owner muscle of laying along reinforced concrete beam length direction in the reinforced concrete beam, and along the stirrup of longitudinal stress owner muscle interval arrangement, the two opposite side surfaces outside of reinforced concrete beam all is connected with steel sheet 1, the length and the height of steel sheet 1 equals the length and the height of reinforced concrete beam, and the length edge of steel sheet 1 aligns the length edge of reinforced concrete beam, the height edge of steel sheet 1 aligns the height edge of reinforced concrete beam, open on the upper edge of steel sheet 1 has first notch 2, make steel sheet 1 be the concave shape, the length of first notch 2 equals the third of reinforced concrete beam length, the height of first notch 2 equals the two thirds of reinforced concrete beam height, and the left end and the right-hand member of first notch 2 are located reinforced concrete beam length's third point department respectively, namely the left end distance of first notch 2 equals 1/3 of reinforced concrete beam length to the left end distance of reinforced concrete beam, equally, the right-hand member of first notch 2 equals 1/3 height of reinforced concrete beam from the first notch 2 to the right end distance of a reinforced concrete beam 1/3.
As shown in fig. 9 and 10, the failure analysis of the reinforced concrete beam after the side-mounted steel plate 1 was not provided and the side-mounted steel plate 1 was provided was simulated for the numerical value. As can be seen from comparison, compared with the non-reinforced concrete beam RCB, the reinforced concrete beam SSRCB reinforced by the side-attached steel plate 1 has a concrete damage range generally smaller than that of the non-reinforced concrete beam, particularly, the extent of upward damage of mid-span concrete and the extent of spread of the mid-span damage to two sides are far smaller than those of the non-reinforced concrete beam, which further illustrates that the side-attached steel plate 1 has a good effect of reducing concrete damage.
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 two adjacent second notches 3 is equal to the distance between 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, wherein 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, the second through hole is not intersected with the first notch 2 and the second notch 3, the connecting fastener simultaneously passes through the first through hole and the second through hole and then presses the steel plate 1 on the two opposite side surfaces of the reinforced concrete beam, as shown in fig. 3, 4, 7 and 8, the connecting fastener is a rod piece with threads and through holes at two ends, the steel plate 1 is pressed by a locking nut, as shown in fig. 4, two lacing wires 5 with different lengths are arranged in the area between the lower part of the first notch 2 of the steel plate 1, two ends of the lacing wires 5 are respectively connected at the through holes of the connecting fastener, and the through hole 4 of the upper edge accessory of the steel plate 1 is only used for inserting the connecting fastener.
Claims (5)
1. The reinforced concrete beam is characterized in that the outer sides of two opposite side surfaces of the reinforced concrete beam are connected with steel plates (1), the length and the height of the steel plates (1) are equal to those of the reinforced concrete beam, the length edges of the steel plates (1) are aligned with the length edges of the reinforced concrete beam, the height edges of the steel plates (1) are aligned with the height edges of the reinforced concrete beam, the upper edges of the steel plates (1) are provided with first notches (2) so that the steel plates (1) are in a concave shape, the length of the first notches (2) is equal to one third of the length of the reinforced concrete beam, the height of the first notches (2) is equal to two thirds of the height of the reinforced concrete beam, and the left ends and the right ends of the first notches (2) are respectively positioned at three equal points in the length direction of the reinforced concrete beam;
The steel reinforced concrete beam is characterized by further comprising a through hole (4), wherein 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); the two steel plates (1) are pressed on the side surfaces of the reinforced concrete beam through connecting fasteners which are simultaneously inserted into the first through holes and the second through holes;
The steel plate reinforced concrete beam comprises a steel plate (1) and at least one lacing wire (5), wherein the lacing wire (5) is parallel to the length direction of the reinforced concrete beam, the lacing wire (5) is positioned in an area between the first notch (2) and the lower edge of the steel plate (1), and two ends of the lacing wire (5) are fixedly connected with a connecting fastener;
The novel steel plate structure further comprises second notches (3), a plurality of the second notches (3) are arranged on the steel plate (1) in parallel and at intervals, and the second notches (3) are located on two sides of the first notches (2).
2. The reinforced concrete beam according to claim 1, wherein the reinforced concrete beam comprises longitudinal stressed main bars arranged along the length direction of the reinforced concrete beam and stirrups arranged at intervals along the longitudinal stressed main bars.
3. A reinforced concrete beam as claimed in claim 2, wherein the spacing between two adjacent second slots (3) is equal to the spacing between adjacent stirrups.
4. A reinforced concrete beam as claimed in claim 3, wherein the height of the second notch (3) is less than the height of the first notch (2).
5. The reinforced concrete beam according to claim 1, wherein the reinforced concrete beam is a constant cross-section beam.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110271232.0A CN112854811B (en) | 2021-03-12 | 2021-03-12 | A reinforced concrete beam |
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| CN202110271232.0A CN112854811B (en) | 2021-03-12 | 2021-03-12 | A reinforced concrete beam |
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| CN112854811A CN112854811A (en) | 2021-05-28 |
| CN112854811B true CN112854811B (en) | 2024-12-06 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109972538A (en) * | 2019-05-07 | 2019-07-05 | 南京林业大学 | Concrete bridge structure and construction technology reinforced by a steel plate inner filling material combination |
| CN214885777U (en) * | 2021-03-12 | 2021-11-26 | 南宁学院 | Reinforced concrete beam |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4554845B2 (en) * | 2001-05-30 | 2010-09-29 | 智深 呉 | Structure reinforcement method |
| JP6479352B2 (en) * | 2014-06-23 | 2019-03-06 | 株式会社フジタ | Hybrid beam |
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2021
- 2021-03-12 CN CN202110271232.0A patent/CN112854811B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109972538A (en) * | 2019-05-07 | 2019-07-05 | 南京林业大学 | Concrete bridge structure and construction technology reinforced by a steel plate inner filling material combination |
| CN214885777U (en) * | 2021-03-12 | 2021-11-26 | 南宁学院 | Reinforced concrete beam |
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