CN110206142B - Prefabricated prestressed concrete frame node for amplifying multi-stage energy consumption of corner - Google Patents
Prefabricated prestressed concrete frame node for amplifying multi-stage energy consumption of corner Download PDFInfo
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- CN110206142B CN110206142B CN201910489648.2A CN201910489648A CN110206142B CN 110206142 B CN110206142 B CN 110206142B CN 201910489648 A CN201910489648 A CN 201910489648A CN 110206142 B CN110206142 B CN 110206142B
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- 238000005265 energy consumption Methods 0.000 title claims abstract description 90
- 239000011513 prestressed concrete Substances 0.000 title claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 62
- 239000010959 steel Substances 0.000 claims description 62
- 239000011150 reinforced concrete Substances 0.000 claims description 49
- 230000021715 photosynthesis, light harvesting Effects 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 17
- 238000010008 shearing Methods 0.000 claims description 7
- 230000001050 lubricating effect Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 abstract description 6
- 238000010276 construction Methods 0.000 description 7
- 239000011148 porous material Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000011065 in-situ storage Methods 0.000 description 5
- 238000004873 anchoring Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000003190 viscoelastic substance Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
- E04B1/21—Connections specially adapted therefor
- E04B1/215—Connections specially adapted therefor comprising metallic plates or parts
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/025—Structures with concrete columns
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Abstract
The invention belongs to the technical field of civil engineering assembled structures, and discloses a prefabricated prestressed concrete frame node for amplifying corner multistage energy consumption. The invention can effectively consume energy under the action of strong/typhoon and earthquake with different intensities, and ensure the stability and energy consumption capability of the node under high intensity earthquake, thereby reducing the damage of main body components, eliminating residual deformation after earthquake and ensuring good self-resetting function.
Description
Technical Field
The invention relates to a prefabricated prestressed concrete frame node capable of amplifying multi-level energy consumption of a corner, and belongs to the field of civil engineering assembly structures.
Background
The prefabricated frame structure is formed by taking a prefabricated beam column produced in a factory as a main stressed member and assembling the prefabricated beam column through reliable connection on a construction site. The method has the advantages of quick construction, high quality, high efficiency, energy conservation, environmental protection and the like, is favorable for realizing green construction and development of building industrialization, and is one of important directions of building structure development in China. However, at present, an equivalent cast-in-situ structure is mainly adopted for assembly in China, and precast beam columns are cast in situ at joints, so that the anti-seismic performance such as structural strength, rigidity and the like can reach or exceed that of the cast-in-situ structure. The structure node is complex in connection form, high in grouting difficulty, and needs on-site wet operation, so that the advantages of the assembled structure cannot be fully exerted. In addition, similar to a cast-in-situ structure, the structure dissipates seismic energy by virtue of plastic deformation of a member, and can ensure the safety of a main structure, but structural damage and residual deformation which are difficult to repair can be generated after the earthquake, so that great economic loss is caused.
The precast prestressed concrete frame adopts unbonded prestressed steel strands to pre-press precast beam columns together, thereby providing structural resistance. The structure does not aim at the seismic performance equivalent to that of the cast-in-situ structure, but releases the constraint among the prefabricated components, and realizes nonlinear reaction through the expansion of the contact surface. Not only can avoid wet connection, guarantee the advantage of assembled structure, can also avoid the formation of plastic hinge, reduce the structural damage greatly. In addition, the prestress steel strand is always in an elastic range, so that residual deformation can be eliminated after earthquake, and the self-resetting function is realized. The structure needs additional energy dissipation devices, and currently, metal yield energy dissipation devices, friction energy dissipation devices, viscoelastic energy dissipation devices and the like are commonly used. However, the energy dissipation effect can be achieved only when the structure is relatively deformed, so that the energy dissipation element is difficult to play a role under the condition of small structural deformation, and the energy dissipation efficiency is low. In addition, the rigidity of the structure is obviously reduced after the node is opened, and a larger earthquake reaction can occur under the action of strong earthquake, so that the problems of performance degradation, insufficient energy consumption capability, serious damage to beam column contact surfaces and non-structural members and the like of the damper are caused.
Disclosure of Invention
The invention provides a prefabricated prestressed concrete frame node which is convenient to construct, can effectively consume energy under the action of strong/typhoon and earthquake with different intensities, and ensures the stability and energy consumption capability under high-intensity earthquake, thereby reducing the damage of main body components, eliminating residual deformation after earthquake and ensuring good self-resetting function.
The technical scheme of the invention is as follows:
a prefabricated prestressed concrete frame node for amplifying corner multistage energy consumption comprises a prefabricated reinforced concrete column, a prefabricated reinforced concrete beam, an amplified corner type node shear damper (hereinafter referred to as a damper), a fixed plate and a high-strength bolt which fix the damper on the column, a beam end sliding device, an energy consumption stop block and a fixed screw on the beam end sliding device, a prestressed steel strand reserved pore canal and an unbonded prestressed steel strand in the prestressed steel strand reserved pore canal; the precast reinforced concrete beam is longitudinally provided with a prestressed steel strand reserved pore canal, the precast reinforced concrete column is provided with a through prestressed steel strand pore canal at a position corresponding to the prestressed steel strand reserved pore canal of the precast reinforced concrete beam, and the unbonded prestressed steel strand penetrates through pore canals in the precast reinforced concrete beam and the precast reinforced concrete column to pre-press the precast reinforced concrete beam and the precast reinforced concrete column together; the beam end sliding device is a metal cavity with one end open, and the opening faces to the side of the precast reinforced concrete column and is fixed at the end part of the precast reinforced concrete beam; two bottom plates of the damper form 90 degrees and are connected through a rotating shaft, one bottom plate is inserted into the beam end sliding device, and the other bottom plate is fixed on the column through a fixing plate and a high-strength bolt; the energy consumption stop block is fixed on the beam end sliding device through a fixing screw.
The damper mainly comprises a rotating shaft, two mutually perpendicular bottom plates connected with the rotating shaft, a curved plate with a sawtooth shape on one side connected with one bottom plate, a gear meshed with the sawtooth of the curved plate, a bearing and a rotary table connected with the gear, four supporting steel plates connected with the other bottom plate, and energy-consuming materials adhered between the supporting steel plates and the rotary table; wherein, be equipped with the bolt hole on the bottom plate that links to each other with the back-up steel sheet, the bottom plate width that links to each other with the bent plate is unanimous with beam-end slider's cavity width.
The three sides of the beam end sliding device are enclosed by side plates, and the beam end sliding device sequentially comprises a bottom plate, a damper sliding cavity, a constraint plate and an energy consumption plate from bottom to top. The bottom surface of the bottom plate is welded with anchoring steel bars, the anchoring steel bars are pre-buried in the precast reinforced concrete beam, the top surface of the bottom plate and the bottom surface of the constraint plate are adhered with lubricating materials, so that the damper bottom plate can freely slide in the cavity, a certain width gap is reserved between the constraint plate and the energy dissipation plate along the longitudinal central line, the width of the gap of the constraint plate is larger than that of the energy dissipation plate, and fixing screw reserved holes are reserved at the edges of the plates at the gaps of the energy dissipation plate;
the fixing plate and the bottom plate of the damper are the same in size, bolt holes are formed in corresponding positions, the fixing plate and the bottom plate of the damper are respectively placed on two opposite surfaces of the prefabricated reinforced concrete column, a reserved hole channel for a damper fixing bolt is formed in the corresponding position of the prefabricated reinforced concrete column, a high-strength bolt penetrates through the bottom plate of the damper, the prefabricated reinforced concrete column and the fixing plate and is fixed together, and the length of the high-strength bolt is larger than the width of the prefabricated reinforced concrete column;
the bottom plate of the damper, which is connected with the curved plate, is inserted into the cavity of the beam end sliding device, so that the curved plate of the damper passes through the gap at the center line of the constraint plate and the energy consumption plate. When the beam column rotates relatively, the bottom plate and the constraint plate of the beam end sliding device drive the damper to connect the bottom plate of the curved plate to rotate, so that the curved plate drives the gear engaged with the curved plate to rotate, the gear drives the turntable connected with the gear to rotate, the turntable rotates relatively with the supporting steel plate fixed on the other bottom plate, and the energy-consuming materials adhered between the turntable and the supporting steel plate are driven to deform in a shearing way. As the radius R of the outer ring of the sawtooth edge of the curved plate is far larger than the radius R of the gear, the rotating angle of the turntable is the actual rotating angle of the beam endThe shear deformation of the energy-consuming material is correspondingly amplified, so that the damper can be started under a smaller node rotation angle, the energy-consuming capacity of the viscoelastic material is fully exerted, and the energy-consuming efficiency is greatly improved;
the energy consumption stop block is an I-shaped metal block, the depth of a groove of the energy consumption stop block is equal to the thickness of an energy consumption plate in the beam end sliding device, the edges of the upper flange and the lower flange are provided with reserved holes corresponding to the reserved holes of fixing screws of the energy consumption plate, after the damper is inserted into the beam end sliding device, the damper curved plate is inserted into the gaps of the energy consumption plate of the beam end sliding device along the two sides of the beam length direction, and the damper curved plate is fixed on the energy consumption plate through the fixing screws;
the damper is fixed on the column and can slide back and forth in the beam end sliding device when the node rotates; the energy consumption check block is connected with the energy consumption plate of the beam end sliding device at a proper distance from the damper curved plate in the sliding direction, and the damper curved plate is arranged between the two energy consumption check blocks; under the smaller node rotation angle, the bent plate of the damper cannot touch the energy consumption stop block, node energy consumption is only provided by the damper, and under the larger node rotation angle, the energy consumption material in the damper can have larger shearing deformation due to the rotation angle amplifying mechanism of the damper, so that performance degradation is caused, and the energy consumption effect is influenced. At this time, the damper curved plate is contacted with the energy consumption stop block to drive the energy consumption stop block to move together, and the energy consumption stop block drives the energy consumption plate connected with the damper curved plate to shear deformation, so that a second energy consumption mechanism is started, necessary node rigidity and energy consumption capacity are provided, and node stability is ensured.
The invention has the beneficial effects that:
(1) Due to the pre-pressing effect of the pre-stress steel strand, under the normal use and the smaller load effect, the beam and the column are completely contacted, and the mechanical property of the node is the same as that of the fixedly connected node; under the action of a large load, the pre-compression force of the edge of the cross section of the beam end is eliminated, the precast reinforced concrete beams and columns are mutually separated, and the plastic deformation is concentrated at the opening part of the node, so that the plastic hinge is avoided, and the damage of the structural member is reduced. Because of the line elastic behavior of the prestressed steel strand, the opening angle between the unloaded back beam and the unloaded back beam is closed, thereby eliminating the residual deformation of the node and realizing the self-resetting function.
(2) The pressure of the prestressed steel strand produces larger friction force on the contact surface of the precast reinforced concrete beam column, so that the beam end shearing force is resisted, in addition, the bottom plate and the restraint plate of the beam end sliding device restrain the vertical displacement of the damper bottom plate, and the shearing resistance of the node is further improved.
(3) Because the precast reinforced concrete beam column and the prestressed steel strand do not enter plasticity, the energy consumption capacity of the node is completely provided by an additional energy consumption device, however, the existing damper needs to be started under larger deformation, and is difficult to achieve the energy consumption effect in time.
(4) Under the action of strong vibration, the node rotation angle is larger, the performance of the energy-consuming material is degraded, necessary rigidity and energy-consuming capacity are difficult to provide, and larger structural reaction and main body member damage are caused. In the technical scheme, the bent plate of the damper can touch the energy consumption stop block under a large rotation angle, so that the energy consumption plate of the beam end sliding device is driven to deform, the energy consumption plate and the damper are stressed together, the rigidity of the node is improved, in addition, the energy consumption plate is subjected to in-plane shearing deformation, a second energy consumption mechanism of the node is started, the node energy consumption is further increased, the node damage under strong shock is reduced, and the stability of the node is ensured.
(5) The prefabricated reinforced concrete beam column components, the damper and the beam end sliding device are prefabricated by factories and transported to a construction site for assembly, and dry operation is adopted in the whole process, so that on-site wet operation is avoided, the quality of the components can be ensured, the construction efficiency can be improved, and the construction period and the construction cost can be effectively controlled.
Drawings
FIG. 1 is a front view of the device of the present invention;
FIG. 2 is a top view of the device of the present invention;
FIG. 3 is a top view of a beam end;
FIG. 4 is a cross-sectional view taken along line 1-1 of FIG. 2;
FIG. 5 is a cross-sectional view taken along line 2-2 of FIG. 2;
FIG. 6 (a) is a front perspective view of a beam-end slide;
FIG. 6 (b) is a top view of the beam-end slide;
FIG. 7 is a schematic view of a beam end slider bottom plate, side plates, constraint plates, and energy consuming plates;
FIG. 8 (a) is a top view of the energy dissipating stopper;
fig. 8 (b) is a front view of the energy consumption block;
FIG. 9 (a) is an enlarged front perspective view of a corner damper;
FIG. 9 (b) is a cross-sectional view of an enlarged corner damper A-A;
FIG. 10 (a) is a front view of a small angle of rotation of a node;
FIG. 10 (b) is a top view of the node rotation at a small rotation angle;
FIG. 11 (a) is a front view of a large-angle lower node rotation;
fig. 11 (b) is a top view of the node rotation under a large rotation angle.
In the figure: the reinforced concrete column comprises a precast reinforced concrete column 1, a precast reinforced concrete beam 2, a beam end sliding device 3, a bottom plate 31, a side plate 32, a cavity 33, a constraint plate 34, a power consumption plate 35, a lubricating material 36, a beam anchoring steel bar 37, a node shearing damper 4 with an enlarged corner, a bottom plate connected with a curved plate 41, a bottom plate connected with a supporting steel plate 42, a rotating shaft 43, a curved plate 44, a supporting steel plate 45, a damper gear 46 and a bearing 47, a rotating disc 48, a power consumption material 5 unbonded prestressed steel strand, a fixed plate 6, a high-strength bolt 7 and a power consumption stop 8.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings.
A prefabricated prestressed concrete frame node for amplifying multi-level energy consumption of a corner comprises a prefabricated reinforced concrete column 1, a prefabricated reinforced concrete beam 2, a beam end sliding device 3, an amplified corner node shear damper 4, unbonded prestressed steel strands 5, a fixed steel plate 6, a high-strength bolt 7 and an energy consumption stop block 8; the precast reinforced concrete column 1 and the precast reinforced concrete beam 2 are pre-pressed together through unbonded prestressed steel strands 5, and are mutually perpendicular to form a main body of the precast prestressed concrete frame node;
the beam end sliding device 3 and the amplified corner type node shear damper 4 form an energy consumption device of the prefabricated prestressed concrete frame node; the beam end sliding device 3 is a cavity with one end open and surrounded by a side plate 32, a bottom plate 31 and an energy consumption plate 35, wherein the cavity is internally provided with the bottom plate 31, the cavity 33, a constraint plate 34 and the energy consumption plate 35 from bottom to top, and the upper surface of the bottom plate 31 and the lower surface of the constraint plate 34 are adhered with a lubricating material 36; gaps with certain widths are reserved between the constraint plates 34 and between the energy dissipation plates 35 along the longitudinal central lines, and the widths of the gaps between the constraint plates 34 are wider than those between the energy dissipation plates 35; the energy consumption plate 35 is provided with groove-shaped and honeycomb-shaped openings, and fixing screw preformed holes of the energy consumption stop block 8 are reserved at the edges of the gaps;
the amplified corner type node shear damper 4 comprises a bottom plate 41, a bottom plate 42, a rotating shaft 43, a curved plate 44, four supporting steel plates 45, gears and bearings 46, a turntable 47 and energy consumption materials 48, wherein the bottom plate 41 is connected with the curved plate, the bottom plate 42 is connected with the supporting steel plates, and the bottom plate 41 is perpendicular to the bottom plate 42, and the two are connected through the rotating shaft 43; the bottom plate 41 of the damper connected with the curved plate is inserted into the cavity 33 of the beam end sliding device 3, and slides along the length direction of the beam in the beam end sliding device 3; the width of the bottom plate 41 of the damper connected with the curved plate is consistent with the width of the cavity 33 of the beam end sliding device 3; a bottom plate 42 of the damper connected with the supporting steel plate is fixed on the precast reinforced concrete column 1; the curved plate 44 is a curved plate with a serrated edge, one edge of which is fixed on the bottom plate 41 of the damper connected to the curved plate, and the serrated edge of which is meshed with the gear 46; the gear 46 is connected with the turntable 47 at two ends through bearings to form a symmetrical structure; the four support steel plates 45 are vertically connected to the bottom plate 42 of the damper connected with the support steel plates, each two support steel plates 45 are symmetrically positioned at two sides of the turntable 47, and energy dissipation materials 48 are adhered between the support steel plates 45 and the turntable 47;
the size of the bottom plate 42, which is connected with the damper and the supporting steel plate, of the fixed plate 6 is the same, bolt holes are formed in corresponding positions, and the fixed plate and the damper are fastened on the precast reinforced concrete column 1 through high-strength bolts 7; the energy consumption stop block 8 is an I-shaped steel block, the depth of the groove is equal to the thickness of the energy consumption plate 35 in the beam end sliding device 3, fixing bolt holes corresponding to reserved holes on the energy consumption plate 35 are reserved on the edges of the upper flange and the lower flange, and the edges of the energy consumption plate 35 are embedded into the groove between the upper flange and the lower flange of the energy consumption stop block 8 and are fixed.
The bottom plate 31 of the beam-end sliding device 3 is provided with an anchor bar 37, and the beam-end sliding device 3 is fixed at the end of the precast reinforced concrete beam 2.
The fixing plate 6 and the bottom plate 42 connected with the damper and the supporting steel plate are respectively placed on two opposite surfaces of the precast reinforced concrete column 1, a reserved hole channel of a damper fixing bolt is arranged at a corresponding position of a bolt hole on the precast reinforced concrete column 1, and the high-strength bolt 7 sequentially penetrates through the bottom plate 42 connected with the damper and the supporting steel plate, the precast reinforced concrete column 1 and the fixing plate 6, so that the two are fixed together.
The energy consumption stop blocks 8 are fixed on the energy consumption plates 35 through fixing screws on two sides of the curved plates 44 along the length direction of the beam, and keep a certain distance with the curved plates 44; when a small rotation angle occurs to the node, as a distance is reserved between the energy consumption stop block 8 and the curved plate 44, the bottom plate 41 connected with the curved plate by the damper freely slides in the beam end sliding device 3, and the structural energy consumption is only provided by the amplified rotation angle type node shear damper 4; when the node is in a large rotation angle, the bent plate 44 is contacted with the energy consumption stop block 8 to drive the energy consumption plate 35 of the beam end sliding device 3 to jointly deform under the stress, so that additional rigidity and energy consumption are provided for the node, and the stability of the node is ensured.
As shown in fig. 1 and 2, the prefabricated prestressed concrete frame node for amplifying the corner multi-stage energy consumption comprises a prefabricated reinforced concrete column 1 and a prefabricated reinforced concrete beam 2, wherein unbonded prestressed steel strands 5 are used for prepressing the prefabricated reinforced concrete column and the prefabricated reinforced concrete beam together to form a main body of the node, structural resistance is provided by the unbonded prestressed steel strands 5 under the action of an earthquake, and residual deformation is eliminated after the earthquake, so that the self-resetting of the node is realized; the beam end sliding device 3 and the amplified corner type node shear damper 4 form a node energy consumption device.
As shown in fig. 3 to 5, the bottom plate 31 of the beam-end sliding device 3 is provided with an anchor bar 37, which is fixed at the end of the precast reinforced concrete beam 2, and the energy dissipation stop 8 is fixed on the energy dissipation plate 35 thereof by a fixing screw; in the enlarged corner type node shear damper 4, a bottom plate 41 connected with a curved plate 44 is inserted into a cavity 33 of the beam-end sliding device 3, and a bottom plate 42 connected with a supporting steel plate 45 is fixed on the precast reinforced concrete column 1 through a fixing plate 6 and a high-strength bolt 7.
The bottom plate 41 of the damper connected with the curved plate is clamped between the bottom plate 31 and the constraint plate 34 of the beam end sliding device 3, and the lubricating material 36 is adhered to the top surface of the bottom plate 31 and the bottom surface of the constraint plate 34, so that the bottom plate 41 of the damper connected with the curved plate can slide freely along the longitudinal direction; the dissipative stops 8 are fixed on both sides of the curved plate 44 in the longitudinal direction of the beam at a distance therefrom.
As shown in fig. 6 and 7, the inside of the beam end sliding device 3 is respectively provided with a bottom plate 31, a cavity 33, a constraint plate 34 and an energy consumption plate 35 from bottom to top, and the side plates 32 are connected with the steel plates to form a cavity. The longitudinal central lines of the constraint plate 34 and the energy dissipation plate 35 are provided with a gap with a certain width, the gap width of the constraint plate 34 is wider than that of the energy dissipation plate 35, the energy dissipation plate 35 is provided with groove-shaped and honeycomb-shaped openings, and the edge of the gap is provided with a fixing screw reserved hole of the energy dissipation stop block 8.
As shown in fig. 8, the energy dissipation stop block 8 is an i-shaped steel block, the depth of the groove of the i-shaped steel block is equal to the thickness of the energy dissipation plate 35 of the beam end sliding device, and fixing bolt holes corresponding to reserved holes on the energy dissipation plate 35 are reserved on the edges of the upper flange and the lower flange.
As shown in fig. 9, the bottom plate 41, which is connected with the curved plate, of the damper is connected with the curved plate 44, the bottom plate 42, which is connected with the supporting steel plate, of the damper is connected with the supporting steel plate 45, when the beam column rotates relatively, the curved plate 44 rotates around the rotating shaft 43 to drive the gear 46 meshed with the saw teeth on the curved plate to rotate, the gear 46 drives the rotating disc 47 connected with the gear through the upper bearing of the gear to rotate, the rotating disc 47 is clamped between the supporting steel plates 45, and the energy consumption material 48 is adhered between the two.
As shown in fig. 10, when a small rotation angle occurs at the node, since a certain distance is reserved between the energy consumption stop block 8 and the curved plate 44, the bottom plate 41 of the damper connected with the curved plate slides freely in the beam end sliding device 3, and the structural energy consumption is only provided by the damper 4.
As shown in fig. 11, when a large rotation angle occurs to the node, the curved plate 44 contacts with the energy consumption stop block 8, so that the energy consumption plate 35 of the beam end sliding device 3 is driven to deform under common stress, additional rigidity and energy consumption are provided for the node, and the stability of the node is ensured.
Claims (1)
1. The prefabricated prestressed concrete frame node is characterized by comprising a prefabricated reinforced concrete column (1), a prefabricated reinforced concrete beam (2), a beam end sliding device (3), an amplified corner node shear damper (4), unbonded prestressed steel strands (5), a fixing plate (6), a high-strength bolt (7) and an energy consumption stop block (8); the prefabricated reinforced concrete column (1) and the prefabricated reinforced concrete beam (2) are pre-pressed together through unbonded prestressed steel strands (5) and are mutually perpendicular to form a main body of the prefabricated prestressed concrete frame node;
the beam end sliding device (3) and the amplified corner type node shear damper (4) form an energy consumption device of the prefabricated prestressed concrete frame node; the beam end sliding device (3) is a cavity with one end open and is surrounded by a side plate (32), a bottom plate (31) and an energy consumption plate (35), the cavity is internally provided with the bottom plate (31), a cavity (33), a constraint plate (34) and the energy consumption plate (35) from bottom to top, and lubricating materials (36) are adhered to the upper surface of the bottom plate (31) and the lower surface of the constraint plate (34); a gap with a certain width is reserved between the constraint plates (34) and the energy dissipation plates (35) along the longitudinal central line, and the width of the gap between the constraint plates (34) is wider than that between the energy dissipation plates (35); the energy consumption plate (35) is provided with groove-shaped and honeycomb-shaped openings, and fixing screw reserved holes of the energy consumption stop blocks (8) are reserved at the edges of the gaps;
the amplified corner type node shear damper (4) comprises a bottom plate (41) which is connected with a curved plate through the damper, a bottom plate (42) which is connected with a supporting steel plate through the damper, a rotating shaft (43), a curved plate (44), four supporting steel plates (45), gears, bearings, a rotating disc (47) and energy consumption materials (48), wherein the bottom plate (41) which is connected with the curved plate through the damper is mutually perpendicular to the bottom plate (42) which is connected with the supporting steel plate through the damper, and the connection of the bottom plate (41) and the bottom plate is realized through the rotating shaft (43); a bottom plate (41) of the damper connected with the curved plate is inserted into a cavity (33) of the beam end sliding device (3), and the beam extends in the beam end sliding device (3) to slide in the longitudinal direction; the width of a bottom plate (41) of the damper connected with the curved plate is consistent with the width of a cavity (33) of the beam end sliding device (3); a bottom plate (42) of the damper connected with the supporting steel plate is fixed on the precast reinforced concrete column (1); the curved plate (44) is a curved plate with a sawtooth edge, one edge of the curved plate is fixed on a bottom plate (41) connected with the curved plate through a damper, and the sawtooth edge of the curved plate is meshed with the gear; the two ends of the gear are connected with the turntable (47) through bearings to form a symmetrical structure; four support steel plates (45) are vertically connected to a bottom plate (42) of the damper, which is connected with the support steel plates, each two support steel plates (45) are symmetrically positioned at two sides of the turntable (47), and energy-consuming materials (48) are adhered between the support steel plates (45) and the turntable (47);
the size of the bottom plates (42) connected with the damper and the supporting steel plate is the same, bolt holes are formed in corresponding positions, and the bottom plates and the damper are fastened on the precast reinforced concrete column (1) through high-strength bolts (7); the energy consumption stop block (8) is an I-shaped steel block, the depth of a groove of the energy consumption stop block is equal to the thickness of an energy consumption plate (35) in the beam end sliding device (3), fixing bolt holes corresponding to reserved holes on the energy consumption plate (35) are reserved at the edges of the upper flange and the lower flange, and the edges of the energy consumption plate (35) are embedded into the groove between the upper flange and the lower flange of the energy consumption stop block (8) and are fixed;
the bottom plate (31) of the beam end sliding device (3) is provided with an anchor steel bar (37), and the beam end sliding device (3) is fixed at the end part of the precast reinforced concrete beam (2);
the fixing plate (6) and the bottom plate (42) connected with the damper and the supporting steel plate are respectively placed on two opposite faces of the precast reinforced concrete column (1), a reserved hole channel for a damper fixing bolt is arranged at the corresponding position of a bolt hole on the precast reinforced concrete column (1), and the high-strength bolt (7) sequentially penetrates through the bottom plate (42) connected with the damper and the supporting steel plate, the precast reinforced concrete column (1) and the fixing plate (6) to fix the two materials together;
the energy consumption stop blocks (8) are fixed on the energy consumption plates (35) through fixing screws at two sides of the curved plates (44) along the length direction of the beam, and keep a certain distance with the curved plates (44); when a small rotation angle occurs to the node, as a distance is reserved between the energy consumption stop block (8) and the curved plate (44), a bottom plate (41) connected with the curved plate by the damper freely slides in the beam end sliding device (3), and the structural energy consumption is only provided by the angle-enlarged node shearing damper (4); when the node is in a large rotation angle, the bent plate (44) is in contact with the energy consumption stop block (8), so that the energy consumption plate (35) of the beam end sliding device (3) is driven to deform under common stress, additional rigidity and energy consumption are provided for the node, and the stability of the node is ensured.
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| CN112854443B (en) * | 2021-01-08 | 2022-05-31 | 哈尔滨工业大学 | Assembly type concrete self-resetting beam-column combined node connecting structure and assembling method |
| CN113123453B (en) * | 2021-03-06 | 2022-09-06 | 河北工业大学 | Assembled double-herringbone supporting frame system based on gear energy consumption and construction method |
| CN113266076B (en) * | 2021-04-20 | 2022-04-15 | 成都理工大学 | Anti-seismic device of beam-column joint of reinforced concrete structure |
| CN113863492B (en) * | 2021-09-17 | 2023-04-11 | 哈尔滨工业大学 | Fabricated concrete beam-column self-resetting node based on friction steel plate connection and assembling method |
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