CN115637781B - Energy dissipation recoverable steel structure beam column joint and assembly method thereof - Google Patents
Energy dissipation recoverable steel structure beam column joint and assembly method thereof Download PDFInfo
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Abstract
The invention provides an energy dissipation recoverable steel structure beam column node and an assembly method thereof, wherein the node comprises a short cantilever beam, one end of the short cantilever beam is fixedly connected with a steel column, the other end of the short cantilever beam is movably connected with a connecting I-beam through dampers symmetrically arranged on the outer surfaces of an upper wing plate and a lower wing plate; the recovery device comprises a plurality of L-shaped connecting pieces, a stress piece and a fixing piece; the L-shaped connecting piece is respectively arranged at two sides of the short cantilever I-beam and the web plate of the connecting I-beam, and the long side of the L-shaped connecting piece is movably connected with the inner surfaces of the short cantilever I-beam and the wing plate of the connecting I-beam; the stress piece is horizontally arranged along the length of the beam, and the short side penetrating through the L-shaped connecting piece is fixed by the fixing piece and applies prestress. The bearing capacity requirement under the action of static load is borne by the stress piece; when an earthquake occurs, the joint is not damaged under the action of the earthquake by jointly consuming energy through the damper and the stress piece; and the mode that the damper and the stressed piece bear together after the earthquake occurs ensures that the damper and the stressed piece recover to the initial position under the action of static load.
Description
Technical Field
The invention relates to the technical field of buildings, in particular to an energy dissipation recoverable steel structure beam column node and an assembly method thereof.
Background
The structural beam column connecting nodes in the traditional steel structure building mostly adopt rigid connecting node forms, and comprise full-bolt connection and bolt welding mixed connection, as shown in fig. 5, wherein a and b are bolt welding mixed connection; c is full bolt connection. The beam column connecting nodes adopting the two connecting modes belong to rigid nodes, and under the action of an earthquake, a plastic hinge is usually formed at the beam end so as to achieve the purpose of energy dissipation. The principle of 'strong column weak beam, strong shear weak bend and strong node weak member' specified in the building earthquake-resistant design rule GB50011 in China is to realize the earthquake-resistant purpose by dissipating energy far from the beam end of the node domain, the beam end is possibly damaged locally under the action of medium earthquake or large earthquake, the plastic hinge formed by the beam end dissipates energy and has various disadvantages such as poor energy dissipating performance, difficult repair and reinforcement after disaster and the like, so researchers at home and abroad propose 'recoverable structure concept', and the functions of recovering and self-resetting are realized by adopting the core-penetrating prestress steel strand, and the energy consumption efficiency in the earthquake process is realized. The technology requires professional equipment to apply pretension, and the pretension loss is generated due to the influence of factors such as relaxation, creep and the like in the normal operation stage after the pretension is stretched, and the pretension loss is not easy to quantify.
The Chinese patent with publication number of CN113502917B discloses a high-strength spring type self-resetting beam column node, and particularly discloses a node structure which adopts part of movable connection and provides energy consumption by means of a high-strength spring and a damping fin, wherein the problems mainly comprise: 1. the connection mode is not all movable connection, wherein the beams are also connected by a pin shaft; 2. the connecting structure at the connecting part determines that when an earthquake occurs, the connecting plates on the surfaces of the pin shaft and the upper wing plate and the lower wing plate are stressed at first, but the damper and the high-strength spring can participate in the work after the pin shaft and the upper wing plate are plastically deformed and damaged, and the node structure at the moment can be damaged and cannot play a role; 3. the structure is complex, the high-strength spring and the damping fin are positioned on the same action plane, and the high-strength spring and the damping fin are mutually interfered when being installed, and when working, a certain part can not act, and the other part bears all the force, so that the stress stability of the structure is poor.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide the recoverable steel structure beam column node which is connected in a full movable mode, is more reliable in stress and better in energy dissipation effect and the assembling method thereof.
In order to achieve the technical purpose, the technical scheme provided by the invention comprises the following steps:
the energy dissipation recoverable steel structure beam column joint comprises a steel column, a short cantilever I-beam, a connecting I-beam, a wing plate connecting plate, a damper and a recovery device; one end of the short cantilever beam is fixedly connected with the steel column, and the other end of the short cantilever beam is movably connected with the connecting I-beam through dampers symmetrically arranged on the outer surfaces of the upper wing plate and the lower wing plate and the wing plate connecting plate;
the restoring device comprises a plurality of L-shaped connecting pieces, a stress piece and a fixing piece; the L-shaped connecting pieces are respectively arranged at two sides of the short cantilever I-beam and the web plate of the connecting I-beam, and the long sides of the L-shaped connecting pieces are movably connected with the inner surfaces of the short cantilever I-beam and the wing plate of the connecting I-beam; the stress piece is horizontally arranged along the length of the beam, and the short side penetrating through the L-shaped connecting piece is fixed by the fixing piece and applies prestress.
In some preferred embodiments, the damper includes a first connecting plate, two groups of damping fins are fixedly arranged on the surface of the first connecting plate, and the second connecting plate is fixedly connected with one end, away from the first connecting plate, of the two groups of damping fins respectively; and the second connecting plate is movably connected with the short cantilever I-beam and the connecting I-beam wing plate respectively.
In some preferred embodiments, two groups of damping fins fixed on one surface of the connecting plate are arranged in an inclined symmetrical manner.
In some preferred embodiments, the force-bearing member comprises a screw, a high-strength spring, and a stopper; the high-strength spring is sleeved on the outer surface of one end of the screw rod after penetrating through the short side of the L-shaped connecting piece; the baffle piece is arranged at two ends of the high-strength spring and matched with the fixing piece, and is used for clamping the high-strength spring.
In some preferred embodiments, the stress member comprises a prestressed steel strand.
The invention also provides an assembly method of the energy dissipation recoverable steel structure beam column node, which is characterized by comprising the following steps of:
hoisting the connecting I-beam to a preset position, and pre-connecting the short cantilever I-beam with the connecting I-beam by using a wing plate and a bolt connecting plate;
placing the damper and the L-shaped connecting piece in place, and pre-connecting the damper, the L-shaped connecting piece and the beam wing plate by bolts;
tightening a pre-connected bolt on the web plate;
the mounting recovery device horizontally arranges the stressed piece along the length of the beam, and the short side penetrating through the L-shaped connecting piece is fixed by the fixing piece;
tightening a pre-connected bolt on the wing plate;
and (5) applying prestress to the stressed piece to complete assembly.
Advantageous effects
1. All parts are connected in a full movable mode, welding construction is not needed on a construction site, on one hand, construction cost is saved, on the other hand, related parts can be reused, and original mounting screw holes can be directly used for original beam column connecting joints which are connected through full bolts without additional refitting.
2. The bearing capacity requirement under the action of static force load is borne by the stress piece, the specific specification and form of the stress piece can be selected according to actual requirements, the stress piece can be any one of a prestress steel strand and a high-strength spring, and the prestress loss of the whole stress piece is compensated by adjusting the tensioning degree of the high-strength spring or the prestress steel strand.
3. The joint is not damaged under the action of earthquake through the joint energy consumption of the damper and the stress piece, and the plastic hinge is locked at the section position where the device is arranged; when an earthquake occurs, the energy is effectively dissipated, so that the damage of the structure is reduced; after the earthquake occurs, the mode that the damper and the stressed piece bear together has enough rotation rigidity under the action of static load, and the damper and the stressed piece are ensured to restore to the initial position.
4. The method has wide application range, and can be widely applied to the positions of the connecting nodes of the pure steel structure building, the steel tube concrete structure building and the super high-rise cantilever truss.
Drawings
FIG. 1 is a schematic view of a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of a damper according to a preferred embodiment of the present invention;
FIG. 3 is a schematic view of another preferred embodiment of the present invention;
FIG. 4 is a schematic view of the installation effect of a preferred embodiment in actual engineering;
FIG. 5 is a schematic illustration of a rigid connection node of a structural beam-column connection node in a conventional steel structure building;
in the figure: 1. a steel column; 2. short cantilever I-beams; 3. connecting I-beams; 4. a wing plate connecting plate; 5. a damper; 501. a first connecting plate; 502. a damping sheet; 503. a second connecting plate; 6. an L-shaped connector; 7. a force-bearing member; 701. a screw; 702. a high-strength spring; 703. a blocking member; 704. prestress steel strand; 8. a fixing member;
Detailed Description
The present invention will be further described with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent. In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Example 1
As shown in fig. 1 to 4, the embodiment provides an energy dissipation recoverable steel structure beam column node, which comprises a steel column 1, a short cantilever i-beam 2, a connecting i-beam 3, a wing plate connecting plate 4, a damper 5 and a recovery device; one end of the short cantilever beam is fixedly connected with the steel column 1, and the other end of the short cantilever beam is movably connected with the connecting I-beam 3 through dampers 5 symmetrically arranged on the outer surfaces of the upper wing plate and the lower wing plate and a wing plate connecting plate 4; the steel column 1 can be a steel frame column in a pure steel structure building or a steel tube concrete column in a steel tube concrete structure. The short cantilever I-beam 2 is used for providing a reserved space for connecting the I-beam 3 with the steel column 1, and belongs to a part of the steel column 1.
The restoring device comprises a plurality of L-shaped connecting pieces 6, a stress piece 7 and a fixing piece 8; the L-shaped connecting piece 6 is respectively arranged at two sides of the web plates of the short cantilever I-beam 2 and the connecting I-beam 3, and the long side of the L-shaped connecting piece is movably connected with the inner surfaces of the wing plates of the short cantilever I-beam 2 and the connecting I-beam 3; the short side penetrating through the L-shaped connecting piece 6 is fixed by the fixing piece 8 and is applied with prestress. The connection here may in particular be locked by means of a threaded nut or the like.
It will be appreciated that the damper 5 and the restoring means in this embodiment together provide an energy-dissipating and shock-absorbing effect. The energy dissipation and shock absorption technology of the structure is to arrange energy dissipation (damping) devices (or elements) at certain parts of the structure (such as a support, a shear wall, a connecting joint or a connecting member). Before the main body enters an inelastic state, the device (or element) firstly enters an energy-consuming working state, and friction, bending (or shearing and torsion) elastoplastic (or viscoelasticity) hysteresis deformation is generated by the device to dissipate energy or absorb the energy of the earthquake input structure so as to reduce the earthquake reaction of the main body structure. The mature technology applied to the efficiency damping technology in China can be divided into buckling restrained braces, viscous dampers 5, metal dampers 5 and the like. But the energy dissipation and shock absorption member is mainly used as a supporting member at present, and the beam column joint is less in direct use, because the beam column joint also needs to bear the bearing capacity requirement under the action of static load, which is not longer than the damper 5. The present embodiment thus takes up the primary load-bearing capacity requirement under static load by means of the force-bearing members 7 arranged horizontally along the length of the beam.
The embodiment is suitable for structural beam column connection nodes in various steel structure buildings, and is particularly suitable for node forms adopting full-bolt connection. The end of the steel beam of the original node is not required to be changed, the connecting plate on the wing plate of the end of the beam is only required to be removed and replaced by the damper 5 and the recovery device in the embodiment, and the connecting hole in connection is only required to be the original connecting hole. The improvement avoids auxiliary construction such as welding, cutting and the like on a construction site, saves construction cost on one hand, and enables related parts to be reused on the other hand. And moreover, the method can enable the person skilled in the art to select more during construction, and can select to reconstruct all or part of nodes according to the actual condition of the site, so that the construction process has more flexibility and pertinence.
In some preferred embodiments, as shown in fig. 2, a preferred construction of the damper 5 is provided. The damper 5 comprises a first connecting plate 501, two groups of damping fins 502 are fixedly arranged on the surface of the first connecting plate 501, and the second connecting plate 503 is fixedly connected with one end, away from the first connecting plate 501, of the two groups of damping fins 502 respectively; and the second connecting plate 503 is respectively and movably connected with the short cantilever I-beam 2 and the wing plate of the connecting I-beam 3. It should be understood that the damper 5 in the present embodiment is a unidirectional damper 5. When an earthquake occurs, before the main body enters an inelastic state, the relative displacement trend between the beams is not single in the same direction or different directions, and the common integrated damper 5 is firstly acted on by connecting plates at two sides of the beam due to being installed at the joint of the beams, and then the same group of damper plates 502 work together, so that the working state of the damper 5 is uncertain, part of the damper plates 502 are left and right, part of the damper plates 502 are probably not acted at all, the two groups of damper plates 502 in the embodiment are respectively connected with the beams at two ends, the two groups of damper plates 502 are respectively acted, and energy is dissipated through bending and elastoplastic hysteresis deformation, so that the problem that the working state of the integrated damper 5 in the prior art is uncertain when in work is avoided. Preferably, the two sets of damping fins 502 fixed on the surface of the first connecting plate 501 are disposed in an oblique and symmetrical manner, so as to provide a certain degree of prestress.
The restoring device is used for bearing the bearing capacity requirement under the action of static load on one hand, and restoring each component to the initial position after earthquake on the other hand, the recoverable structure technology means that the structure or the structural component can eliminate plastic deformation to restore to the initial position after the earthquake action through the prestress technology, and a simple prestress steel strand 704 core penetrating structure is commonly used in engineering at present. However, the problems that the prestress loss is generated due to the influence of factors such as relaxation, creep and the like in the normal operation stage and the prestress loss is not easy to quantify exist. In order to make the restoring force loss quantifiable and to compensate for the lost prestress, the force-bearing member 7 comprises a screw 701, a high-strength spring 702 and a stop 703; the high-strength spring 702 is sleeved on the outer surface of one end of the screw 701 penetrating through the short side of the L-shaped connecting piece 6; the blocking pieces 703 are arranged at two ends of the high-strength spring 702, and are matched with the fixing pieces 8 to clamp the high-strength spring 702. The high-strength spring 702 and the screw 701 are used for jointly bearing the bearing capacity requirement under the action of static load, a person skilled in the art can select the specification of the high-strength spring 702 according to actual requirements, stretch the high-strength spring 702 to the required prestress through the bolts, and can check the torque value through the electric torque wrench so as to convert the pretightening force, and when the high-strength spring 702 needs to be compensated due to the prestress loss, the value required to be supplemented can be checked through the torque wrench.
In this embodiment, the high-strength spring 702 is only required to be sleeved on the outer surface of one end of the screw 701 penetrating through the short side of the L-shaped connecting piece 6, which is based on the following considerations:
the high-strength spring 702 in the embodiment bears the dead load under the daily condition on one hand, and also plays a part of energy consumption role (the damper 5 bears most of large earthquake load) during an earthquake, and when the earthquake is over, the beam is pulled back to the initial position under the combined action of the prestress and the elasticity stored by the high-strength spring 702 and the damper 5. It is known that the columns, which are the main load bearing members, are not themselves easily deformed and displaced for the whole structure, so that the columns will provide the basis for stress during the recovery phase.
If the high-strength springs 702 are respectively sleeved at two ends of the screw 701 (as in the prior art, the high-strength springs 702 near one end of the upright post need to be preset to be pulled in the installation stage, and the high-strength springs 702 far away from one end of the upright post need to be preset to be pressed in the installation process, the installation process is complex, and in special cases, if the high-strength springs 702 at two sides are pulled (i.e. the high-strength springs 702 are compressed), restoring forces at two sides cancel each other to fail to realize the restoring effect.
And a high-strength spring 702 is sleeved at any end of the screw 701, so that the installation process is simpler and more convenient, and the stress state is clearer and controllable. The specific high-strength spring 702 is sleeved at the end of the screw 701, and can be specifically set by a person skilled in the art according to the actual installation situation and installation space of the site.
In other preferred embodiments, as shown in FIG. 3, the force-receiving member 7 further comprises prestressed steel strands 704. The method and principle of installation is similar to that of the rigid high strength spring 702 described above and will not be described again.
The following analysis was made with respect to the principle of action of the present invention:
the beam end at the node is provided with a restoring device (comprising a high-strength spring or a prestress steel strand) so as to meet the requirements of constant load, live load action and bearing capacity under wind load action under daily conditions, when earthquake action occurs, the dampers at the upper flange and the lower flange start to work, the dampers and the node restoring device provide energy consumption damping together, the energy dissipation effect is achieved, after the earthquake is finished, the inertia force caused by the earthquake disappears, the horizontal inertia force borne by the structure is greatly reduced, and the structure is automatically restored to the initial position under the effects of the metal damping of the upper flange and the lower flange and the rigidity of the restoring device.
Example 2
The embodiment provides an assembly method of an energy dissipation recoverable steel structure beam column node, which specifically comprises the following steps:
hoisting the connecting I-beam 3 to a preset position, and pre-connecting the short cantilever I-beam 2 and the connecting I-beam 3 by using a wing plate and a bolt connecting plate;
placing the damper 5 and the L-shaped connecting piece 6 in place, and pre-connecting the damper 5, the L-shaped connecting piece 6 and the beam wing plate by bolts;
tightening a pre-connected bolt on the web plate;
the mounting recovery device horizontally arranges the stress piece 7 along the beam length, and the short side penetrating the L-shaped connecting piece 6 is fixed by the fixing piece 8;
tightening a pre-connected bolt on the wing plate;
the stress piece 7 is prestressed to complete the assembly.
It should be understood that, when the force-bearing member 7 is a screw 701, a high-strength spring 702, and a stopper 703, the method of applying the prestress may include: the securing member 8 is tightened to compress the spring to store the prestress, and tightening of the securing member 8 is stopped when the spring is compressed sufficiently to provide a satisfactory prestress. Reference is also made to the above steps when compensation for lost prestressing is required. Obviously, the prestress stored in the compression spring can be quantified by the tightening degree of the fixing member 8, and the specific quantification method does not belong to the protection scope of the present invention, so that the details are not repeated here.
When the stress member 7 is a prestressed steel strand 704, the method for applying the prestress may be an existing operation method, and may include: one end of the prestressed steel strand 704 is fixed, and after applying a pretension using a professional apparatus, the other end is fixed.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. The utility model provides an energy dissipation recoverable steel construction beam column node which characterized in that: comprises a steel column (1), a short cantilever I-beam (2), a connecting I-beam (3), a wing plate connecting plate (4), a damper (5) and a recovery device; one end of the short cantilever beam is fixedly connected with the steel column (1), and the other end of the short cantilever beam is movably connected with the connecting I-beam (3) through dampers (5) symmetrically arranged on the outer surfaces of the upper wing plate and the lower wing plate and a wing plate connecting plate (4);
the restoring device comprises a plurality of L-shaped connecting pieces (6), stress pieces (7) and fixing pieces (8); the L-shaped connecting piece (6) is respectively arranged at two sides of the short cantilever I-beam (2) and the web plate for connecting the I-beam (3), and the long side of the L-shaped connecting piece is movably connected with the inner surfaces of the short cantilever I-beam (2) and the wing plate for connecting the I-beam (3); the stress piece (7) is horizontally arranged along the length of the beam, and the short side penetrating through the L-shaped connecting piece (6) is fixed by the fixing piece (8) and is applied with prestress;
the damper (5) comprises a first connecting plate (501), two groups of damping sheets (502) are fixedly arranged on the surface of the first connecting plate (501), and a second connecting plate (503) is fixedly connected with one end, far away from the first connecting plate (501), of the two groups of damping sheets (502) respectively; the second connecting plate (503) is respectively and movably connected with the short cantilever I-beam (2) and the wing plate of the connecting I-beam (3);
two groups of damping fins (502) fixedly arranged on the surface of the first connecting plate (501) are obliquely and symmetrically arranged.
2. The energy-dissipating recoverable steel structure beam column node of claim 1, wherein: the stress piece (7) comprises a screw (701), a high-strength spring (702) and a baffle piece (703); the high-strength spring (702) is sleeved on the outer surface of one end of the screw (701) penetrating through the short side of the L-shaped connecting piece (6); the baffle (703) is arranged at two ends of the high-strength spring (702), is matched with the fixing piece (8), and is used for clamping the high-strength spring (702).
3. The energy-dissipating recoverable steel structure beam column node of claim 1, wherein: the stress piece (7) comprises a prestress steel strand (704).
4. A method of assembling a beam-column joint of energy-dissipating recoverable steel structure as claimed in any one of claims 1 to 3, comprising:
hoisting the connecting I-beam (3) to a preset position, and pre-connecting the short cantilever I-beam (2) and the connecting I-beam (3) by using a wing plate and a bolt connecting plate;
the damper (5) and the L-shaped connecting piece (6) are placed in place, and the damper (5), the L-shaped connecting piece (6) and the beam wing plate are pre-connected by bolts;
tightening a pre-connected bolt on the web plate;
the mounting recovery device is used for horizontally arranging the stress piece (7) along the length of the beam, and the short side penetrating through the L-shaped connecting piece (6) is fixed by the fixing piece (8);
tightening a pre-connected bolt on the wing plate;
and (3) pre-stressing the stress piece (7) to complete the assembly.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211423796.2A CN115637781B (en) | 2022-11-15 | 2022-11-15 | Energy dissipation recoverable steel structure beam column joint and assembly method thereof |
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| CN202211423796.2A CN115637781B (en) | 2022-11-15 | 2022-11-15 | Energy dissipation recoverable steel structure beam column joint and assembly method thereof |
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| CN115637781B true CN115637781B (en) | 2023-07-18 |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101403230B1 (en) * | 2012-09-13 | 2014-06-02 | 주식회사 디알비동일 | Steel frame connection structure having steel damper of omega type |
| CN208251313U (en) * | 2018-03-02 | 2018-12-18 | 国核电力规划设计研究院有限公司 | A kind of hinged joint and simply supported beam of girder steel and steel column |
| CN211549021U (en) * | 2019-08-28 | 2020-09-22 | 燕山大学 | Self-resetting steel frame beam-column joint with hidden staged energy dissipation damper |
| CN211817108U (en) * | 2020-02-27 | 2020-10-30 | 安徽尚德科技有限公司 | Assembled mild steel damper |
| CN113047454B (en) * | 2021-04-07 | 2022-06-21 | 青岛理工大学 | FRP (fiber reinforced plastic) steel concrete column and steel beam combined node and mounting method |
| CN113502917B (en) * | 2021-06-16 | 2022-05-17 | 燕山大学 | Spring type self-resetting beam column node |
| CN113404160A (en) * | 2021-08-02 | 2021-09-17 | 甘肃天水绿色装配式建筑产业发展有限公司 | Self-resetting assembly type concrete beam column energy consumption connecting node and construction method |
| CN216664470U (en) * | 2021-09-27 | 2022-06-03 | 燕山大学 | Self-resetting steel frame beam column joint of crawler steel energy dissipation damper |
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