CN113653362A - Three-axis prestress reinforcing method for special-shaped steel plate of space node of square column and rectangular beam of frame structure - Google Patents
Three-axis prestress reinforcing method for special-shaped steel plate of space node of square column and rectangular beam of frame structure Download PDFInfo
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- CN113653362A CN113653362A CN202111121614.1A CN202111121614A CN113653362A CN 113653362 A CN113653362 A CN 113653362A CN 202111121614 A CN202111121614 A CN 202111121614A CN 113653362 A CN113653362 A CN 113653362A
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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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Abstract
The invention relates to a three-axis prestress reinforcing method for a special-shaped steel plate of a square column and rectangular beam space node of a frame structure, which comprises a square column and four rectangular beams, wherein central shafts of the four rectangular beams are positioned at the same height position of the square column to form a space node structure; the intersection point positions of the square column axis and the four rectangular beam axes are the coordinate original point O to form a space rectangular coordinate system, the original point is used as the center to form eight quadrants, the eight special-shaped steel plates 3 are arranged in 8 quadrants around the node structure, the square column and the rectangular beams around the whole node are wrapped by the eight special-shaped steel plates through bolt connection, and three-way prestress is applied to the node through bolts between adjacent special-shaped steel plates when the node is reinforced. The method is designed aiming at the space node of the square column and rectangular beam combined structure, and the bearing performance of the space node can be improved on the premise of not damaging the original structure of the column beam.
Description
Technical Field
The invention discloses a method for reinforcing a column node of a concrete frame structure, in particular to a novel method for reinforcing a special-shaped steel plate of a square column rectangular beam space node through triaxial prestress.
Background
The beam reinforcements and the column reinforcements at the nodes of the concrete frame structure are crossed, and the stirrups are dense and have complex structures; the node bears the axial force, the bending moment and the shearing force transmitted by the beam and the column, the stress condition is very complex, and the node is a weak link which is very easy to damage when the frame structure is subjected to dynamic horizontal loads such as earthquake and the like.
The assembly type building is a structural type which is widely popularized in China, and is formed by transporting well-made building components (such as floor slabs, wall plates, stairs, balconies and the like) and accessories to a building construction site and assembling and installing the components on the site in a reliable connection mode. The method has the advantages of high efficiency, high precision, high quality and environmental protection, but because the node of the component is assembled in a construction site in a cold mode, the node connection rigidity is poor, the anti-seismic performance and the structural collapse resistance of the whole structure are poor, and the node needs to be reinforced and transformed.
The reinforcement of the frame structure node can be divided into beam end reinforcement, column end reinforcement and reinforcement of a node core area, and common reinforcement methods include a carbon fiber reinforcement method, a column-outside-wrapped angle steel reinforcement method, an outside-bonded steel plate reinforcement method, an increased cross section reinforcement method and the like.
If the application number is 201810194317.1, a beam column node reinforcing structure and a construction method thereof are disclosed, the reinforcing structure can be reinforced on the basis of welding the cross beam, the longitudinal beam and the column body by arranging the transverse pipes and the longitudinal pipes on the cross beam and the longitudinal beam, the transverse pipes are indirectly reinforced on the column wing plates through steel plates of connecting pieces, two longitudinal side plates of the longitudinal pipes are respectively attached and fixed with the two column wing plates, the reinforcing structure is mainly arranged aiming at steel structure nodes, the steel structure nodes can enable outer structures to be welded and fixed with the beam column nodes, and the reinforcing structure is not suitable for reinforcing concrete beam column nodes and needs to be connected with the internal structure of the original beam column.
The Chinese patent with the application number of 201711212346.8 discloses an energy dissipation sleeve of a prestress assembly type node and an installation and working method thereof, wherein the sleeve comprises a plurality of sleeve split units, and the sleeve wrapping the prestress assembly type node is spliced by high-strength bolts among the sleeve split units; each sleeve split unit comprises a column sleeve split unit and a beam end sleeve, and the column sleeve split unit is connected with the beam end sleeve through an arc viscoelastic damper at the corner; the arc-shaped viscoelastic damper comprises a plurality of arc-shaped steel plates, and the arc-shaped steel plates are alternately overlapped in layers through viscoelastic materials. The energy consumption sleeve of the prestress assembly type node improves the energy consumption capacity of the assembly type node. It has the limitations that: firstly, the energy dissipation device is only suitable for assembly type nodes, the columns and the beams are prefabricated in a factory, the connection positions of the columns and the beams are connected together by prestress, the prestress is a mode of node combination and consolidation, namely an assembly mode, secondly, the energy dissipation sleeves and the nodes are installed synchronously during construction and forming, thirdly, the energy dissipation sleeves are used for dissipating energy and reducing vibration, and the strength and the rigidity of the nodes cannot be increased.
Therefore, for reinforcing the concrete frame structure node, the safety, the applicability, the rationality and the economy of the reinforced node are comprehensively considered, and the following points are met: the method has the advantages that the original rigidity of the node is not damaged, no steel bars are drilled and planted at the beam end or the column end of the node, no wet operation is performed in the reinforcing construction, elements for reinforcing can be manufactured in a factory and assembled on site, stress lag does not exist in reinforcing materials, and the node is not damaged in a gradient manner.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: the method is designed aiming at the space node (figure 1) of a square column and rectangular beam combined structure, and can improve the bearing performance of the space node on the premise of not damaging the original structure of a column beam.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a three-axis prestress reinforcing method for a special-shaped steel plate of a square column and rectangular beam space node of a frame structure comprises a square column 1 and four rectangular beams 2, and a frame structure space node structure is formed; the central shafts of the four rectangular beams are positioned at the same height position of the square column to form a space node structure; the direction of the axis of the square column is taken as the Z direction, the direction of the axis of one pair of the rectangular beams is taken as the X direction, the direction of the axis of the other pair of the rectangular beams is taken as the Y direction, and the positive direction of the X, Y, Z shaft meets the right-hand rule; the crossing point position of the square column axis and the four rectangular beam axes is a coordinate origin O, a space rectangular coordinate system is formed, and the origin is used as the center to form eight quadrants, which is characterized in that:
eight deformed steel plates 3 are arranged in 8 quadrants around the node structure, square columns and rectangular beams around the whole node are wrapped by the eight deformed steel plates through bolt connection, and three-way prestress is applied to the node through bolts between adjacent deformed steel plates when the node is reinforced.
The eight special-shaped steel plates have the same structure, and the four special-shaped steel plates are in a group, one group wraps the upper area of the node, and the other group wraps the lower area of the node; each special-shaped steel plate comprises a right-angle equilateral angle steel connecting piece 31, the height of the right-angle equilateral angle steel connecting piece in the Z-axis direction is less than half of the height of the node core reinforcing area, and two side lengths of the right-angle equilateral angle steel connecting piece in the X, Y direction are less than half of the side length of the square column and can be tightly attached to the side surface of the square column; the special-shaped steel plate is of a special-shaped structure, a corner boss 32 is arranged in the X, Y direction of the right-angle equal-edge angle steel connecting piece, an L-shaped structure flange 33 is arranged at the upper part of each corner boss, bolt through holes 34 are formed in two right-angle edges of the L-shaped structure flange, a horizontal flange 35 is also arranged at the lower part of each corner boss, the included angle between each horizontal flange and the right-angle equal-edge angle steel connecting piece and the corner boss is 90 degrees, each horizontal flange is provided with a bolt through hole, and the included angle between each two horizontal flanges is 90 degrees; the positions of the corner bosses can be just attached to the intersecting positions of the edges of the corresponding rectangular beams, the rectangular beams and the square columns, two opposite L-shaped structural flanges are fixedly connected together between two adjacent special-shaped steel plates in one group through bolts, and two horizontal flanges in opposite positions are connected together by an upper group of corresponding special-shaped steel plates and a lower group of corresponding special-shaped steel plates through bolts, so that eight special-shaped steel plates completely wrap the positions of the nodes.
Compared with the prior art, the invention has the beneficial effects that:
the invention directly arranges 8 wrapped special-shaped steel plates outside the node (figure 2), the 8 wrapped special-shaped steel plates have the same structure, can wrap beams and columns around the node completely, can apply prestress to the node in the direction of three axes of X, Y, Z, can realize the three-axis prestress reinforcement of the node, does not open holes in the beam and column structure around the node and does not damage the inherent bearing performance of the node.
Secondly, the reinforcing elements such as the special-shaped steel plates are basically the same in specification, can be manufactured in a factory in advance according to design requirements, and then are assembled on site to reinforce the nodes, so that the reinforcing construction speed is high, and the cost is low.
And thirdly, the method can be suitable for reinforcing beam column joints made of various materials. The node material can be concrete, steel and wood, and has wide application range.
Because the invention can apply prestress to the node in the direction of three axes of X, Y, Z, and the prestress can be adjusted, the primary stress and the secondary stress of the node are synchronous, and the echelon damage can be avoided when the node is overloaded.
During the prestress reinforcement construction, the in-service use of the node is not influenced, and the node is reinforced through the prestress arrangement.
The reinforcement construction does not have wet operation, and the node can immediately bear the load after the reinforcement construction is finished; and after the node is reinforced, the bearing capacity, rigidity and energy consumption capability of the node can be obviously improved.
Drawings
FIG. 1 is a spatial node model diagram of a square column and rectangular beam combination according to the present invention.
Fig. 2 is a schematic structural diagram of a deformed steel plate (fillet).
Fig. 3 is a schematic view of an assembly structure after the node is reinforced.
Wherein, 1 is the square column, 2 is the square beam, 3 is the deformed steel plate, 31 is right angle equilateral angle steel connecting piece, 32 is the corner boss, 33 is L type structure flange, 34 is the bolt through-hole, 35 is horizontal flange.
Detailed Description
The present invention is further explained with reference to the following examples and drawings, but the scope of the present invention is not limited thereto.
The invention relates to a three-axis prestress reinforcing method for a special-shaped steel plate of a square column and rectangular beam space node of a frame structure, which comprises a node model diagram (figure 1) of a square column 1 and a rectangular beam 2 to form a space node structure;
the material of the node can be reinforced concrete, wood or steel and the like;
the direction of the axis of the square column is the Z direction, the direction of the axis of one pair of rectangular beams is the X direction, the direction of the axis of the other pair of rectangular beams is the Y direction, the intersection point position of the axis of the square column and the axes of the four rectangular beams is a coordinate origin O to form a space rectangular coordinate system, the positive directions of the X and Y Z coordinates meet the right-hand rule, and eight quadrants are formed by taking the origin as the center;
eight special-shaped steel plates 3 are arranged in 8 quadrants around the node structure, and square columns and rectangular beams around the whole node are wrapped by the eight special-shaped steel plates through bolt connection.
In the three directions of the X, Y, Z axis, the prestress can be adjusted by the bolt and the nut in the direction so as to meet the requirement of engineering reinforcement.
The eight special-shaped steel plates have the same structure, and the four special-shaped steel plates are in a group, one group wraps the upper area of the node, and the other group wraps the lower area of the node; each special-shaped steel plate (figure 2) comprises a right-angle equilateral angle steel connecting piece 31, the height of the right-angle equilateral angle steel connecting piece in the Z-axis direction is less than half of the height of a node core reinforcing area (the total height of a wrapping area formed after eight special-shaped steel plates wrap a node), two side lengths of the right-angle equilateral angle steel connecting piece in the X, Y direction are slightly less than half of the side length of a square column, and the right-angle equilateral angle steel connecting piece can be tightly attached to the side face of the square column;
the deformed steel plate is the abnormal shape structure, X, Y directions at right angle equilateral angle steel connecting piece are equipped with a turning boss 32 respectively, the upper portion of every turning boss is provided with L type structure flange 33, bolt through-hole 34 has all been seted up on two right-angle sides of L type structure flange, the lower part of every turning boss also is provided with horizontal flange 35, horizontal flange is 90 with the contained angle between right angle equilateral angle steel connecting piece and the turning boss, a bolt through-hole has all been seted up on every horizontal flange, the contained angle between two horizontal flanges also is 90. The positions of the corner bosses can be just attached to the intersecting positions of the edges of the corresponding rectangular beams, the rectangular beams and the square columns, two opposite L-shaped structural flanges are fixedly connected together between two adjacent special-shaped steel plates in one group through bolts, and two horizontal flanges in opposite positions are connected together by an upper group of corresponding special-shaped steel plates and a lower group of corresponding special-shaped steel plates through bolts, so that eight special-shaped steel plates completely wrap the positions of the nodes.
And when the node is reinforced, the three-way prestress is applied to the node through the bolts between the adjacent special-shaped steel plates.
The invention is provided with a plurality of L-shaped structural flanges and horizontal flanges, the whole structure is symmetrical, prestress can be respectively applied in three directions of the node, the strength and the rigidity of the node are enhanced, and further, the bearing performance of the square column and the rectangular beam node and the whole body is improved.
Two bolt through holes are formed in the L-shaped structural flange, bolts can be installed on the two bolt through holes according to the requirement of the actual prestress, prestress is applied, and the bolts can be installed on one bolt hole independently.
The invention adopts a full wrapping mode to reinforce the node at the node position, the bolt connecting structures are all arranged outside the node, and the reinforcing structures are not required to be arranged inside the beam column, so that the existing beam and column cannot be damaged, the bolts in three directions are connected, the prestress in three directions can be adjusted, the specific prestress is comprehensively set according to the requirements of the beam column node structure, the required target load, the beam column main body material property, the special-shaped steel plate thickness and the like, and the synchronous stress of a new structure and the existing node structure can be realized.
The reinforcement method comprises the following specific steps:
selecting the material type, thickness and size of the special-shaped steel plate according to the size of the square column and the rectangular beam, the target load requirement and the prestress;
wrapping four special-shaped steel plates in the upper area of the node along the circumferential direction, and preliminarily installing corresponding bolts in any bolt through hole of the L-shaped structural flange to realize preliminary fixing of the special-shaped steel plates in the upper area of the node;
thirdly, mounting special-shaped steel plates in the lower area of the node, enabling one special-shaped steel plate in the lower area and the special-shaped steel plate in the corresponding position of the upper part to penetrate through bolt through holes in the two horizontal flanges through bolts to achieve primary fixing of the upper special-shaped steel plate and the lower special-shaped steel plate, and finally wrapping the eight special-shaped steel plates around the node and fixing the eight special-shaped steel plates at the current position;
and step four, pre-tightening force is set for the bolts in the three-axis direction around the node according to the size requirement of the pre-stress, the pre-stress can be applied in the three directions, and the three-axis pre-stress reinforcement of the special-shaped steel plate of the square column rectangular beam space node is realized.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Nothing in this specification is said to apply to the prior art.
Claims (4)
1. A three-axis prestress reinforcing method for a special-shaped steel plate of a square column and rectangular beam space node of a frame structure comprises a square column and four rectangular beams, and a frame structure space node structure is formed; the central shafts of the four rectangular beams are positioned at the same height position of the square column to form a space node structure; the direction of the axis of the square column is taken as the Z direction, the direction of the axis of one pair of the rectangular beams is taken as the X direction, the direction of the axis of the other pair of the rectangular beams is taken as the Y direction, and the positive direction of the X, Y, Z shaft meets the right-hand rule; the crossing point position of the square column axis and the four rectangular beam axes is a coordinate origin O, a space rectangular coordinate system is formed, and the origin is used as the center to form eight quadrants, which is characterized in that:
eight deformed steel plates are arranged in 8 quadrants around the node structure, square columns and rectangular beams around the whole node are wrapped by the eight deformed steel plates through bolt connection, and three-way prestress is applied to the node through bolts between adjacent deformed steel plates when the node is reinforced.
2. The three-axis prestress reinforcing method for the special-shaped steel plates of the space nodes of the square column and the rectangular beam of the frame structure according to claim 1, wherein eight special-shaped steel plates have the same structure, and four special-shaped steel plates are formed into a group, wherein one group wraps the upper areas of the nodes, and the other group wraps the lower areas of the nodes; each special-shaped steel plate comprises a right-angle equilateral angle steel connecting piece, the height of the right-angle equilateral angle steel connecting piece in the Z-axis direction is less than half of the height of the node core reinforcing area, and two side lengths of the right-angle equilateral angle steel connecting piece in the X, Y direction are less than half of the side length of the square column and can be tightly attached to the side face of the square column; the special-shaped steel plate is of a special-shaped structure, a corner boss is arranged in the X, Y direction of the right-angle equal-edge angle steel connecting piece, an L-shaped structure flange is arranged at the upper part of each corner boss, bolt through holes are formed in two right-angle edges of each L-shaped structure flange, a horizontal flange is also arranged at the lower part of each corner boss, the included angle between each horizontal flange and each right-angle equal-edge angle steel connecting piece and each corner boss is 90 degrees, each horizontal flange is provided with a bolt through hole, and the included angle between each two horizontal flanges is also 90 degrees; the positions of the corner bosses can be just attached to the intersecting positions of the edges of the corresponding rectangular beams, the rectangular beams and the square columns, two opposite L-shaped structural flanges are fixedly connected together between two adjacent special-shaped steel plates in one group through bolts, and two horizontal flanges in opposite positions are connected together by an upper group of corresponding special-shaped steel plates and a lower group of corresponding special-shaped steel plates through bolts, so that eight special-shaped steel plates completely wrap the positions of the nodes.
3. The method for reinforcing the special-shaped steel plate of the space node of the square column, the square beam and the space node of the frame structure through the triaxial prestress, wherein the material of the node is at least one of reinforced concrete, wood or steel.
4. The three-axis prestress reinforcing method for the special-shaped steel plate of the space node of the square column and the rectangular beam of the frame structure according to claim 2 is characterized by comprising the following specific steps:
selecting the material type, thickness and size of the special-shaped steel plate according to the size of the square column and the rectangular beam, the target load requirement and the prestress;
wrapping four special-shaped steel plates in the upper area of the node along the circumferential direction, and preliminarily installing corresponding bolts in any bolt through hole of the L-shaped structural flange to realize preliminary fixing of the special-shaped steel plates in the upper area of the node;
thirdly, mounting special-shaped steel plates in the lower area of the node, enabling one special-shaped steel plate in the lower area and the special-shaped steel plate in the corresponding position of the upper part to penetrate through bolt through holes in the two horizontal flanges through bolts to achieve primary fixing of the upper special-shaped steel plate and the lower special-shaped steel plate, and finally wrapping the eight special-shaped steel plates around the node and fixing the eight special-shaped steel plates at the current position;
and step four, pre-tightening force setting is carried out on the bolts in three directions around the node according to the size requirement of the pre-stress, the pre-stress can be applied in the three directions, and the three-axis pre-stress reinforcement of the special-shaped steel plate of the square column rectangular beam node is realized.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111121614.1A CN113653362A (en) | 2021-09-24 | 2021-09-24 | Three-axis prestress reinforcing method for special-shaped steel plate of space node of square column and rectangular beam of frame structure |
| CN202210978408.0A CN115110796A (en) | 2021-09-24 | 2022-08-16 | Beam-column joint three-axis prestress special-shaped steel plate reinforcing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111121614.1A CN113653362A (en) | 2021-09-24 | 2021-09-24 | Three-axis prestress reinforcing method for special-shaped steel plate of space node of square column and rectangular beam of frame structure |
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| Publication Number | Publication Date |
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| CN113653362A true CN113653362A (en) | 2021-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111121614.1A Pending CN113653362A (en) | 2021-09-24 | 2021-09-24 | Three-axis prestress reinforcing method for special-shaped steel plate of space node of square column and rectangular beam of frame structure |
| CN202210978408.0A Withdrawn CN115110796A (en) | 2021-09-24 | 2022-08-16 | Beam-column joint three-axis prestress special-shaped steel plate reinforcing method |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210978408.0A Withdrawn CN115110796A (en) | 2021-09-24 | 2022-08-16 | Beam-column joint three-axis prestress special-shaped steel plate reinforcing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115749360A (en) * | 2022-12-19 | 2023-03-07 | 苏州达康建筑科技有限公司 | Shock-absorbing energy-dissipating device for building column top or column bottom |
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- 2021-09-24 CN CN202111121614.1A patent/CN113653362A/en active Pending
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- 2022-08-16 CN CN202210978408.0A patent/CN115110796A/en not_active Withdrawn
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