CN106592807B - Replaceable energy consumption connecting assembly for beam-column connection of assembled concrete frame - Google Patents
Replaceable energy consumption connecting assembly for beam-column connection of assembled concrete frame Download PDFInfo
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- CN106592807B CN106592807B CN201710018132.0A CN201710018132A CN106592807B CN 106592807 B CN106592807 B CN 106592807B CN 201710018132 A CN201710018132 A CN 201710018132A CN 106592807 B CN106592807 B CN 106592807B
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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
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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
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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
- E04H9/025—Structures with concrete columns
Abstract
The invention provides a replaceable energy consumption connecting assembly for beam-column connection of an assembled concrete frame, which is arranged on the upper side and/or the lower side of a beam end connected with a beam-column of an assembled concrete frame structure and comprises one or more energy consumption core steel plates (1) arranged side by side, an in-column anchoring block (2) positioned at one end of each energy consumption core steel plate (1) and pre-embedded at a corresponding position of column concrete in a prefabricating stage, an in-beam anchoring block (3) positioned at the other end of each energy consumption core steel plate (1) and pre-embedded at a corresponding position of beam-end concrete in a prefabricating stage, and a constraint system (4) surrounding the energy consumption core steel plates (1); the energy-consuming core steel plate (1), the column inner anchoring block (2) and the beam inner anchoring block (3) are reliably connected to form a continuous force transmission assembly. The application of the replaceable energy consumption connecting component meets the requirement of building industrialization development, has the advantages of batch production and rapid assembly construction, and greatly reduces the difficulty of repairing the structure after earthquake.
Description
Technical Field
The invention belongs to the field of constructional engineering, relates to an assembled concrete frame structure, and particularly relates to a replaceable energy consumption connecting assembly applied to beam-column connection of an assembled concrete frame.
Background
In recent decades, the prefabricated concrete structure has been favored by engineers and widely used and developed rapidly worldwide due to its characteristics of industrial production and prefabricated construction. Along with the deepening of the performance-based earthquake-proof design theory research, the requirement of people on repairability of a structure after earthquake is higher and higher, the research and the application of high-ductility energy-consuming elements are concerned more and more, the method of adding the ductility energy-consuming elements into an assembled structure is mature day by day in countries and regions such as the United states, New Zealand, Japan and the like, and the adoption of an assembly technology and an energy-consuming and shock-absorbing technology in a structural system becomes one of the future development trends of the building industry.
The connection is the key to the installation and stress of the fabricated concrete frame. Under the action of horizontal force, a large bending moment is generated at the joint, and the joint is easy to yield under repeated action. Aiming at the characteristic, a proper ductile energy dissipation device is used in the assembly type structure, so that the damage mechanism of the structure can be induced, and the structure can play an excellent anti-seismic property.
The Buckling Restrained Brace (BRB) is an axial force-bearing component which restrains and supports a core plate through an external restraining component and limits the buckling of the core plate under compression, and can fully play the hysteretic property of the core plate under the action of cyclic tension and compression under the action of a strong earthquake to achieve the purpose of dissipating earthquake energy. Buckling Restrained Braces (BRBs) are typically disposed between the diagonal frame nodes, and the component size is large, which has a certain adverse effect on the frame structure space utilization. There are also angle braces placed near the outside of the beam-column joint, which saves structural space compared to Buckling Restrained Braces (BRBs), but still adversely affects structural aesthetics and space utilization.
After a violent earthquake occurs, the yield part of the structure is greatly damaged. The damaged engineering structure has the disadvantages of weakened load bearing and acting capacity, deteriorated stress performance and lowered safety of the structure. Under the action of earthquake which may happen in the future, structural integrity is more likely to be lost due to accelerated failure of damaged parts, collapse is seriously likely to happen, and huge loss of lives and properties of people is caused. However, if the structure can be quickly repaired to recover the bearing capacity and the stress performance of the structure, the structure plays a vital role in recovering and reconstructing after disasters.
Aiming at the problems, the invention provides a replaceable energy-consumption connecting assembly applied to the beam-column connection of an assembled concrete frame, which is a beam-column connecting assembly arranged at the beam end of an assembled concrete frame structure and is used for bearing and transmitting the repeated axial force of the upper side edge and/or the lower side edge caused by the bending moment of the beam end of a frame under the action of an earthquake; the energy-consumption core steel plate is similar to a small Buckling Restrained Brace (BRB) in form, the energy-consumption core steel plate is restrained by the restraint system when being pressed, the restraint system is fixed in concrete at the beam end by the embedded bolts, and large-amplitude buckling cannot occur even if the energy-consumption core steel plate is pressed to yield. When the earthquake occurs slightly, the energy dissipation core steel plates arranged on the upper side and/or the lower side of the beam end keep elastic, and bending rigidity is provided for beam-column connection; when the earthquake occurs in a medium or large earthquake, the energy consumption core steel plate is pulled or pressed to yield, the hysteresis characteristic is utilized to dissipate the earthquake energy, the dynamic response of the structure is reduced, the damage is only concentrated on the energy consumption core steel plate, and the rest part of the structure keeps elasticity. After an earthquake occurs, the damaged energy consumption core steel plate is taken out and a new energy consumption core steel plate is installed again by removing the connection between the energy consumption core steel plate and the anchoring block and the restraint around the energy consumption core steel plate, so that the purpose of repairing the structure is achieved. The invention has the characteristics that the energy consumption core steel plate can exert stable ductile energy consumption capacity, the damage is only concentrated on the energy consumption core steel plate, and the damaged energy consumption core steel plate can be conveniently replaced after strong shock, thereby quickly recovering the structure function.
Disclosure of Invention
The technical problem is as follows: aiming at the technical problems, the invention provides a replaceable energy-consumption connecting component applied to the connection of an assembled concrete frame beam column, so as to meet the requirements of quick construction, attractive structure, energy dissipation, shock absorption and easy repair after earthquake.
The technical scheme is as follows: the technical problems aimed at by the invention are as follows:
1) the structure of the connecting node is the key for exerting the shock resistance of the fabricated concrete frame structure. The components of a fabricated concrete structure are generally joined at nodes, so that the performance of the connection is particularly important in a fabricated concrete structure. The connecting node is a necessary channel for internal force transmission among the components, and under the action of strong earthquake, the beam-column node connection bears larger internal force, so that plastic deformation is easy to occur. The frame structure always utilizes the plastic deformation capacity of the beam end to dissipate seismic energy, and the cast-in-place or equal cast-in-place assembled integral frame structure can have the phenomena of compressed concrete collapse, compressed reinforcing steel bar bulging and the like when the plastic deformation is large, so that the bearing capacity of a hysteresis curve is obviously reduced, and the rotation capacity of a plastic hinge is limited.
2) The connection construction of the node is a key problem for the installation of the fabricated concrete frame structure. In the fabricated concrete frame structure, prefabricated parts are fabricated in a factory, the labor productivity can be improved through mass machine production, and the on-site connection construction still needs to be completed by more manual operations. Whether the process of node connection is convenient to operate and whether the process is suitable for an industrialized installation mode and a quick installation process is the key for influencing the production efficiency of industrialized buildings.
3) The characteristics of the construction process of the fabricated concrete frame structure are utilized, and high-quality energy-consumption connection is adopted, so that the key for ensuring the anti-seismic performance of the fabricated concrete frame structure is realized. Under the cast-in-place construction process, the nodes, the connection and the components are integrally formed, and the reinforcing steel bars and the concrete near the nodes are continuous, so that the components and the nodes have related bearing performance, and because the stress of the nodes is more complex, the strong nodes and the weak components need to adopt stricter construction requirements. In the fabricated concrete frame structure, the connection of the nodes lags behind the completion of the manufacture of the components, so that engineers can adopt special structures at the joints under certain conditions and adopt high-quality energy-consumption connection, thereby fully exerting the seismic performance of the structure and ensuring the seismic capacity of the structure.
4) The easy replacement of the damaged component is the key to ensure the easy repair of the structural performance. At present, the easy repair of structural performance is the latest requirement of engineering structure for earthquake resistance. The energy consuming connections dissipate seismic energy by plastic hysteresis of the material, while the development and accumulation of plastic properties simultaneously contribute to the progressive aggravation of damage. In order to ensure that the structure after the earthquake has the earthquake resistance which can bear the earthquake possibly encountered in the subsequent service period, the rapid repair of the damaged structure after the earthquake is the most economic scheme, and the replacement of the damaged component is the most thorough and perfect repair means for repairing the structure, so that the easy replacement of the damaged component is the key for ensuring the easy repair of the structure performance.
The invention discloses a replaceable energy consumption connecting component for connecting an assembled concrete frame beam column, which adopts the technical scheme that:
the replaceable energy-consumption connecting assembly connected with the beam column of the fabricated concrete frame is arranged on the upper side and/or the lower side of the beam end connected with the beam column of the fabricated concrete frame structure and comprises one or more energy-consumption core steel plates arranged side by side, an in-column anchoring block which is positioned at one end of each energy-consumption core steel plate and is pre-embedded at a corresponding position of column concrete in a prefabricating stage, an in-beam anchoring block which is positioned at the other end of each energy-consumption core steel plate and is pre-embedded at a corresponding position of beam end concrete in the prefabricating stage and a constraint system surrounding the energy-consumption core steel plates; the energy-consuming core steel plate is reliably connected with the column inner anchoring block and the beam inner anchoring block to form a continuous force transmission assembly.
The replaceable energy-consumption connecting assembly connected with the assembled concrete frame beam column is arranged in a space reserved on the upper side and/or the lower side of the beam end in the prefabrication stage, and after the assembly is completed, post-cast concrete is adopted to fill the rest part of the reserved space.
The energy-consuming core steel plate is sequentially divided into a column-direction connecting section, a column-direction transition section, an energy-consuming section, a beam-direction transition section and a beam-direction connecting section along the length direction; the sectional areas of the column direction connecting section and the beam direction connecting section are larger than the sectional area of the energy consumption section; the energy consumption section and the column are smoothly transited to the connecting section and the beam is smoothly transited to the connecting section, and the column is transited to the transition section and the beam is transited to the transition section respectively.
The energy-consuming core steel plate is a complete steel plate or a middle slotted steel plate.
The energy dissipation core steel plate is wrapped by non-adhesive materials.
The anchoring block in the column is provided with an anchoring part extending into the concrete of the column; and the anchoring piece in the beam is provided with an anchoring piece extending into the concrete of the beam.
The reliable connection among the column inner anchoring block, the beam inner anchoring block and the energy-consuming core steel plate is welding seam connection.
The length of the restraint system is slightly smaller than the net distance between the column inner anchoring block and the beam inner anchoring block; gaps are reserved between the constraint system and the corresponding surfaces of the energy dissipation core steel plates, and the gaps are filled with non-bonding materials.
The structure of the restraint system comprises two restraint cover plates positioned on the upper side and the lower side of an energy consumption core steel plate, two filling plates positioned on the left side and the right side of the energy consumption core steel plate, a connecting bolt for connecting the restraint cover plates and the filling plates into a whole, and an embedded bolt for fixing the parts at the beam end; the filling plate can be connected with one of the constraint cover plates into a whole.
The other structure of the restraint system comprises a restraint cover plate positioned on the outer side of the energy consumption core steel plate, post-cast concrete positioned around the energy consumption core steel plate and embedded bolts for fixing the restraint cover plate at the beam end; the two sides of the constraint cover plate are provided with edge protrusions; after the assembly is installed, the edge protrusions are located on two sides of the energy dissipation core steel plate.
When the energy-consuming core steel plate adopts a middle slotted steel plate or a plurality of steel plates arranged side by side, the constraint system is also provided with a slot part filling block which is arranged in a slot in the middle of the steel plate or in a space among the plurality of steel plates; the slot part filling block is connected with a constraint cover plate into a whole.
The constraint cover plate and the filling plate are provided with bolt holes, so that connecting bolts and/or embedded bolts can be aligned and penetrate through the constraint cover plate and the filling plate conveniently.
Has the advantages that:
1) the structure damage is concentrated, the energy consumption performance is good, and the design principle of 'strong node and weak component' is easy to realize. In the invention, as the yielding energy-consuming core steel plate is arranged near the upper side and/or the lower side of the beam end, the plastic behavior is concentrated at the beam end under the action of an earthquake, and the beam and the column which are used as main bearing components can not generate plastic deformation. The energy-consuming core steel plate adopts a structural principle similar to that of the buckling restrained brace core plate, yielding only occurs in an energy-consuming section of the energy-consuming core steel plate, plastic strain is uniformly distributed after yielding, the energy-consuming core steel plate has smaller plastic strain under the same interlayer deformation, and excellent ductility and low cycle fatigue capability can be exerted. The design of differentiated performance is carried out among all parts of the energy consumption connecting assembly, between the energy consumption connecting assembly and the rest parts of the structure, and the design principle of 'strong node and weak component' is easy to realize.
2) The structure is easy and convenient to repair after earthquake, and the structural performance can be guaranteed after repair. Under the action of an earthquake, the damage of the assembled concrete frame structure connected by the invention is concentrated on the energy-consumption core steel plate, other main components are not obviously damaged, the function of the structure can be recovered only by replacing the energy-consumption core steel plate after the earthquake, the maintenance range is small, and the maintenance process is very simple and convenient.
3) The installation is convenient and the tolerance adaptability is good. The beam column and related components of the prefabricated assembly type concrete frame structure are manufactured respectively in a factory and are sequentially installed on a construction site. If the size of the components is larger than or exactly equal to the size of the installation space of the components, the components collide with each other and are obstructed, and the installation cannot be carried out. Therefore, in order to facilitate the installation of the components, the size of the components should be slightly smaller than the size of the installation space of the components, which results in a gap between the components after the installation is completed. Such gaps are detrimental to beam-end upper and/or lower beam-column connections that are subject to axial tension or compression forces. The invention preferably adopts welding seam connection to connect the energy-consuming core steel plate with the beam inner anchoring block and the column inner anchoring block which are pre-embedded in the beam and column prefabricated parts into a whole, thereby being convenient for eliminating the gap between force transmission systems in the installation stage and connecting the beam and the column into an organic whole.
4) The energy-consuming connecting component can be made into a standard element, and is convenient for industrial production and application. The energy-consuming connecting component mainly adopts steel plate processing and welding, can be adopted by the existing mature process, and is convenient to produce in an industrialized mode. After theory, experiment and calculation analysis, common specification parameters can be summarized to form the standardized design and application of the energy consumption connecting component, and the method has outstanding significance for realizing the industrialized construction of the structure and saving the repair time after earthquake.
5) The practicability is strong, and the appearance is not influenced. The energy-consuming connecting assembly is arranged in a reserved space on the upper side and/or the lower side of the beam end, the energy-consuming core steel plate is directly transferred with a beam column, concrete is poured behind the rest of the reserved space after the energy-consuming core steel plate is installed, so that the structure is integrated, the appearance of the beam is consistent with that of a cast-in-place frame beam, and the traditional aesthetic appearance is met.
Drawings
FIG. 1 is a schematic illustration of the replaceable energy dissipating connecting assembly mounted on the top of a precast concrete beam at the beam-column joint of a fabricated concrete frame according to an embodiment of the present invention (no post-cast concrete is shown)
FIG. 2 is a cross-sectional view of an alternative energy dissipating connecting assembly of a first restraint system type assembled concrete frame beam-column joint installed on top of a precast concrete beam according to an exemplary embodiment of the present invention
FIG. 3 is a cross-sectional view of an alternative energy dissipating connecting assembly of a second type of restraint system for mounting on top of a precast concrete beam at a beam-column joint of a fabricated concrete frame according to an exemplary embodiment of the present invention
FIG. 4 is a schematic top view of a first alternative embodiment of the present invention showing the core steel plate of the energy dissipating connector assembly and the restraint system at the beam and column joint of the fabricated concrete frame in a first restraint system (not shown without adhesive material)
FIG. 5 is a schematic view of a second alternative embodiment of the present invention showing the lower view of the core steel plate of the energy dissipating connector assembly and a portion of the restraint system (not shown without adhesive material) at the beam-column joint of the fabricated concrete frame in a second restraint system
The figure shows that: the energy-consuming core steel plate comprises an energy-consuming core steel plate 1, a column-oriented connecting section 11, a column-oriented transition section 12, an energy-consuming section 13, a beam-oriented transition section 14, a beam-oriented connecting section 15, an in-column anchoring block 2, an anchoring block 21 in column concrete, an in-beam anchoring block 3, an anchoring block 31 in beam concrete, a constraint system 4, a constraint cover plate 41, an edge protrusion 411, a filling plate 42, a connecting bolt 43, a pre-embedded bolt 44, post-cast concrete 45, a groove part filling block 46, a bolt hole 47, an unbonded material 5, a weld joint 6, a precast concrete column 7 and a precast concrete beam 8.
Detailed Description
The following describes a specific embodiment of the present invention by taking an example of an embodiment of the present invention.
The replaceable energy consumption connecting component for connecting the assembled concrete frame beam column is arranged at the left end and/or the right end of the beam and is positioned at the upper side and/or the lower side of the beam end. In this specification, the example of mounting the beam on the upper side of the left end of the beam will be described. In this example, the left side of the beam is the column, and the area of the column within the beam height range is the column node area.
1) Prefabricated component
In the prefabrication stage of the component, the inner anchoring block 2 of the column is embedded in the corresponding position connected in the node area of the column, the edge of the inner anchoring block extends to the surface of the concrete of the column, and the center of the inner anchoring block 2 of the column and the middle surface of the energy dissipation core steel plate 1 to be installed are at the same height; meanwhile, an in-beam anchoring block 3 is embedded at the beam end, and the center of the in-beam anchoring block 3 is at the same height as the middle plane of the energy-consumption core steel plate 1 to be installed; a space for installing the energy-consuming core steel plate 1 and a restraint system 4 of the energy-consuming core steel plate is reserved on the left side of the in-beam anchoring block 3 by using a cavity die, and the net distance between the in-column anchoring block 2 and the in-beam anchoring block 3 is slightly larger than the length of the energy-consuming core steel plate 1 after the beam column is installed in place. According to the design of differential performance, the anchoring bearing capacity of the anchor block 2 in the column concrete and the anchor block 3 in the beam concrete is ensured to be larger than the maximum bearing capacity of the energy dissipation section 13 of the core energy dissipation steel plate 1 after being subjected to tension or compression yielding and repeated tension-compression cycle reinforcement.
And after the pre-embedding is finished, respectively pouring beam concrete and column concrete to manufacture the prefabricated part.
2 beam column installation
When the beam is installed on site, the prefabricated beam column is hoisted in place, and the height and the horizontal position of the beam are adjusted to align the in-column anchoring block 2 and the in-beam anchoring block 3.
3 installation of energy dissipation core steel plate and restraint system
Installing an energy-consuming core steel plate 1 wrapped with non-bonding materials 5 between the column inner anchoring block 2 and the beam inner anchoring block 3, and adjusting the height of the energy-consuming core steel plate to enable the middle surface of the energy-consuming core steel plate to be positioned at the central height of the column inner anchoring block 2 and the beam inner anchoring block 3; connecting the column direction connecting section 11 with the column inner anchoring block 2 through a welding seam; connecting the beam direction connecting section 15 with the beam inner anchoring block 3 through a welding seam 6; the installation of the restraint system 4 and the installation of the energy consumption core steel plate 1 are carried out alternately; the remaining space is filled with post-cast concrete 45.
The length of the restraint system 4 is slightly smaller than the net distance between the column inner anchoring block 2 and the beam inner anchoring block 3; gaps are left between the restraint system 4 and the corresponding surfaces of the energy dissipation core steel plate 1, and the gaps are filled with non-bonding materials 5.
The structure of the restraint system 4 comprises two restraint cover plates 41 positioned on the upper side and the lower side of the energy consumption core steel plate 1, two filling plates 42 positioned on the left side and the right side of the energy consumption core steel plate 1, a connecting bolt 43 for connecting the restraint cover plates 41 and the filling plates 42 into a whole, and an embedded bolt 44 for fixing the parts at the beam end; the filling plate 42 may be integrated with one of the constraining cover plates 41.
The other structure of the restraint system 4 comprises a restraint cover plate 41 positioned on the outer side of the energy consumption core steel plate 1, post-cast concrete 45 positioned around the energy consumption core steel plate and embedded bolts 44 for fixing the restraint cover plate 41 at the beam end; the two sides of the restricting cover plate 41 are provided with edge protrusions 411; after the assembly is installed, the edge protrusions 411 are located on two sides of the energy dissipation core steel plate 1.
When the energy consumption core steel plate 1 adopts a middle slotted steel plate or a plurality of steel plates arranged side by side, the constraint system 4 is also provided with a slot part filling block 46 which is arranged in a space between the middle slotted steel plate or the plurality of steel plates; the slot filling block 46 is integrally connected to a constraining cover 41.
The constraint cover plate 41 and the filling plate 42 are provided with bolt holes 47 for the connection bolts 43 and/or the embedded bolts 44 to align and pass through.
4 replacement of damaged energy-consuming core steel plate after earthquake
After a large earthquake occurs, the post-cast concrete 45 in the reserved space is chiseled, the welding seam connection 6 between the left end and the right end of the energy consumption core steel plate 1 and the in-column anchoring block 2 and the in-beam anchoring block 3 is cut, the constraint system 4 is removed, the damaged energy consumption core steel plate 1 is taken down, then a new energy consumption assembly is installed again according to the installation method of the energy consumption assembly, the reserved space is filled with the post-cast concrete 45 again, and the earthquake-resistant performance of the structure is recovered.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, and those skilled in the art will be able to make various changes and modifications to the embodiments without departing from the spirit of the present invention.
The technology of the invention comprises the following characteristics:
1) and (4) realizing a yield induction mechanism. The replaceable energy-consumption connecting component applied to beam-column connection of the fabricated concrete frame is arranged on the upper side and/or the lower side of the beam end of the fabricated concrete frame structure, and the energy-consumption core steel plate, the column-in anchoring block and the beam-in anchoring block are reliably connected to form a continuous force transmission part and bear the action of axial tension or pressure under the action of bending moment. In the invention, the sectional area of the connecting section of the energy-consuming core steel plate is larger than that of the energy-consuming section, and through differential performance design, the anchoring bearing capacity of the in-column anchoring block and the in-beam anchoring block in the column concrete and the in-beam concrete respectively and the elastic bearing capacity of reliable connection between the in-column anchoring block and the in-beam anchoring block and the energy-consuming core steel plate are both larger than the maximum bearing capacity of the energy-consuming section of the energy-consuming core steel plate after being subjected to tensile or compressive yielding and being subjected to repeated tensile-compressive cycle strengthening; the elastic bearing capacity of the column direction connecting section and the beam direction connecting section of the energy consumption core steel plate for bearing axial tension and pressure is larger than the maximum bearing capacity of the energy consumption section of the energy consumption core steel plate after being subjected to tension or compression yielding and being subjected to repeated tension-compression cycle strengthening; after the energy consumption section of the energy consumption core steel plate is pulled or pressed to yield and is repeatedly strengthened by pulling and pressing circulation, the beam and column bodies of the structure under the corresponding bearing capacity are not damaged or are slightly damaged, and no obvious plastic deformation occurs. Under the design principle of differential performance, when the axial force borne by the energy consumption core steel plate exceeds the yield force determined by design, the yield is only generated within the energy consumption section range of the energy consumption core steel plate, and the areas outside the energy consumption core steel plate are all in the elastic range. Thus, under the action of an earthquake, only the energy consumption section may generate plastic damage, and the rest part is kept in a perfect or basically perfect state. Meanwhile, the energy dissipation core steel plate is arranged in the restraint system without being bonded, and after being pressed or pulled to yield, the energy dissipation section of the energy dissipation core steel plate uniformly generates plastic strain, so that stable hysteretic performance can be exerted. With hysteretic dissipation in the dissipation section, the energy of the seismic input structure will be gradually dissipated, thereby reducing the seismic response.
2) And the damage part can be replaced. The structure of the invention ensures that the energy-consuming core steel plate which is easy to damage under the strong earthquake can be arranged outside the beam-column joint and close to the upper surface and the lower surface of the beam end, and has an open working surface, and the anchoring blocks in the column, the anchoring blocks in the beam and the energy-consuming core steel plate are reliably connected. And through the design of differentiated performance, the beam column body is not damaged or is slightly damaged in the process of yielding under compression or tension of the core section of the energy-consuming core steel plate, and the repeated use of the beam column body is not influenced. Therefore, the purposes of quickly repairing the structure and recovering the functions are achieved by dismantling the damaged energy consumption core steel plate and reinstalling a new energy consumption core steel plate.
3) And (3) realizing a compression buckling prevention mechanism of the energy consumption core steel plate. The energy consumption core steel plate is prevented from being pressed, particularly large-amplitude buckling outside and in the plane after the energy consumption core steel plate is pressed to yield by arranging the constraint system. In order to prevent the constraint system from directly bearing the action of axial pressure, the length of the constraint system is slightly smaller than the net distance between the column inner anchoring block and the beam inner anchoring block, and gaps are reserved between the constraint system and the corresponding surfaces of the energy-consuming core steel plate, so that when the energy-consuming core steel plate is stressed, especially stressed and yielded, the constrained system is reliably prevented from large-amplitude buckling in the surface and outside the surface, and the energy-consuming core steel plate mainly generates uniform axial compression strain. The gap also provides space for the lateral expansion of the energy-dissipating core steel plate due to the poisson effect when the energy-dissipating core steel plate is pressed. In order to further reduce the friction between the energy dissipation core steel plate and the constraint system, an unbonded material is wrapped around the energy dissipation core steel plate, or the unbonded material can fill the gap between the energy dissipation core steel plate and the constraint system. The structure enables the stress of the energy dissipation core steel plate to be like a small buckling restrained brace, can exert stable energy dissipation capacity and has high ductility.
4) Has good tolerance adaptability. The components of the fabricated concrete frame structure are fabricated in advance in a factory and then assembled on site, and even if various measures are taken during the fabrication process to secure the dimensional accuracy of the components, dimensional errors of the components and positional errors of the respective components in the components are inevitable. On the other hand, in order to ensure the smooth assembly, a certain degree of clearance must be left between the components to avoid collision during the assembly, and the existence of the clearance also causes the position error between the components inevitably during the installation. The replaceable energy-consumption connecting component applied to the beam-column connection of the assembled concrete frame is connected with a beam-column component through reliable connection (such as welding) after the beam-column is installed in place, so that the tolerance caused by the reasons can be conveniently coordinated, the convenience of construction and installation is ensured, and the reliability of force transmission is ensured.
Claims (12)
1. The utility model provides a removable power consumption coupling assembling of assembled concrete frame beam column connection which characterized in that:
the replaceable energy-consumption connecting assembly connected with the beam column of the fabricated concrete frame is arranged on the upper side and/or the lower side of the beam end connected with the beam column of the fabricated concrete frame structure and comprises one or more energy-consumption core steel plates (1) which are arranged side by side, an in-column anchoring block (2) which is positioned at one end of each energy-consumption core steel plate (1) and is pre-embedded at a corresponding position of column concrete in a prefabricating stage, an in-beam anchoring block (3) which is positioned at the other end of each energy-consumption core steel plate (1) and is pre-embedded at a corresponding position of beam end concrete in a prefabricating stage, and a constraint system (4) which surrounds the energy-consumption core steel plates (1); the energy-consuming core steel plate (1), the column inner anchoring block (2) and the beam inner anchoring block (3) are reliably connected to form a continuous force transmission assembly.
2. A replaceable energy dissipating connection assembly for an assembled concrete frame beam-column connection as claimed in claim 1, wherein: the replaceable energy-consumption connecting assembly connected with the assembled concrete frame beam column is arranged in a reserved space on the upper side and/or the lower side of the beam end in the prefabrication stage, and after the assembly is completed, post-cast concrete (45) is adopted to fill the rest part of the reserved space.
3. A replaceable energy dissipating connection assembly for an assembled concrete frame beam-column connection as claimed in claim 1, wherein: the energy-consumption core steel plate (1) is sequentially divided into a column-direction connecting section (11), a column-direction transition section (12), an energy-consumption section (13), a beam-direction transition section (14) and a beam-direction connecting section (15) along the length direction; the cross sections of the column-direction connecting section (11) and the beam-direction connecting section (15) are larger than that of the energy consumption section (13); the energy consumption section (13) is in gentle transition with the column direction connecting section (11) and the beam direction connecting section (15) to respectively form a column direction transition section (12) and a beam direction transition section (14).
4. A replaceable energy dissipating connection assembly for an assembled concrete frame beam-column connection as claimed in claim 1, wherein: the energy-consumption core steel plate (1) is a complete steel plate or a middle slotted steel plate.
5. A replaceable energy dissipating connection assembly for an assembled concrete frame beam-column connection as claimed in claim 4, wherein: the energy dissipation core steel plate (1) is wrapped by the non-adhesive material (5).
6. A replaceable energy dissipating connection assembly for an assembled concrete frame beam-column connection as claimed in claim 1, wherein: the anchor block (2) in the column is provided with an anchor (21) extending into the concrete of the column; the in-beam anchoring block (3) is provided with an anchoring part (31) extending into the beam concrete.
7. A replaceable energy dissipating connection assembly for an assembled concrete frame beam-column connection as claimed in claim 1, wherein: the reliable connection among the column inner anchoring block (2), the beam inner anchoring block (3) and the energy-consumption core steel plate (1) is weld joint connection (6).
8. A replaceable energy dissipating connection assembly for an assembled concrete frame beam-column connection according to claim 1, 2 or 5, wherein: the length of the restraint system (4) is slightly smaller than the net distance between the column inner anchoring block (2) and the beam inner anchoring block (3); gaps are reserved between the restraint system (4) and the corresponding surfaces of the energy dissipation core steel plates (1), and the gaps are filled with non-bonding materials (5).
9. A replaceable energy dissipating connection assembly for an assembled concrete frame beam-column connection as claimed in claim 8, wherein: the structure of the restraint system (4) comprises two restraint cover plates (41) positioned on the upper side and the lower side of the energy consumption core steel plate (1), two filling plates (42) positioned on the left side and the right side of the energy consumption core steel plate (1), connecting bolts (43) for connecting the restraint cover plates (41) and the filling plates (42) into a whole and embedded bolts (44) for fixing the parts at the beam end; the filling plate (42) is connected with one of the constraint cover plates (41) into a whole.
10. A replaceable energy dissipating connection assembly for an assembled concrete frame beam-column connection as claimed in claim 8, wherein: the other structure of the restraint system (4) comprises a restraint cover plate (41) positioned on the outer side of the energy consumption core steel plate (1), post-cast concrete (45) positioned around the energy consumption core steel plate and embedded bolts (44) for fixing the restraint cover plate (41) at the beam end; the two sides of the constraint cover plate (41) are provided with edge protrusions (411); after the assembly is installed, the edge protrusions (411) are positioned on two sides of the energy dissipation core steel plate (1).
11. A replaceable energy dissipating connection assembly for an assembled concrete frame beam-column connection according to claim 4, 9 or 10, wherein: when the energy-consuming core steel plate (1) adopts a middle slotted steel plate or a plurality of steel plates arranged side by side, the constraint system (4) is also provided with a groove part filling block (46) which is arranged in a space between the middle slotted steel plate or the plurality of steel plates; the slot part filling block (46) is connected with a constraint cover plate (41) into a whole.
12. A replaceable energy dissipating connection assembly for an assembled concrete frame beam-column connection according to claim 9 or 10, wherein: the constraint cover plate (41) and the filling plate (42) are provided with bolt holes (47) which are convenient for connecting bolts (43) and/or embedded bolts (44) to align and penetrate.
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| CN201710018132.0A CN106592807B (en) | 2017-01-11 | 2017-01-11 | Replaceable energy consumption connecting assembly for beam-column connection of assembled concrete frame |
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| CN201710018132.0A CN106592807B (en) | 2017-01-11 | 2017-01-11 | Replaceable energy consumption connecting assembly for beam-column connection of assembled concrete frame |
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| CN106592807B true CN106592807B (en) | 2022-02-01 |
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| CN111779142B (en) * | 2020-06-21 | 2021-05-14 | 上海城建职业学院 | Replaceable energy consumption connecting assembly for connecting beam column of fabricated building |
| CN112942681A (en) * | 2021-03-15 | 2021-06-11 | 重庆大学 | Assembled truss concrete beam capable of being quickly replaced after earthquake |
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