CN107237402B - Low-damage self-resetting assembled concrete bidirectional frame beam column node - Google Patents
Low-damage self-resetting assembled concrete bidirectional frame beam column node Download PDFInfo
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- CN107237402B CN107237402B CN201610621964.7A CN201610621964A CN107237402B CN 107237402 B CN107237402 B CN 107237402B CN 201610621964 A CN201610621964 A CN 201610621964A CN 107237402 B CN107237402 B CN 107237402B
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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
- 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
- E04B1/22—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 with parts being prestressed
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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
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Abstract
The invention relates to a prefabricated reinforced concrete bidirectional frame beam column node, which is characterized in that: the prefabricated frame columns are continuous in the node areas, the prefabricated frame beams are discontinuous in the node areas, and the beam ends and the column sides form contact surfaces. And the holes are reserved at the positions corresponding to the elevations of the upper steel bar and the lower steel bar in the frame column, the steel bars are penetrated, the two ends of the steel bars are fixed on the embedded steel pieces at the side of the frame beam, the earthquake energy can be dissipated under the earthquake action, and the replacement is easy after the earthquake. And reserving pore channels in the bidirectional frame beams, which are close to the positions of the neutral shafts and the positions corresponding to the frame columns, wherein unbonded prestressed tendons are arranged in the pore channels, and connecting the prefabricated frame beams and the prefabricated frame columns by applying prestress along the bidirectional frame beams. The beam column joint of the prefabricated reinforced concrete frame can obviously improve the anti-seismic performance of the assembled frame structure. The structural system connected by the nodes can realize zero damage or slight damage under rare earthquakes, and the self-resetting after the earthquakes. The node is simple and convenient to construct and low in cost, and is a novel prefabricated concrete frame node connection technology which is worth popularizing.
Description
Technical Field
The invention relates to a prefabricated assembled concrete structure node connection technology, in particular to an assembled concrete bidirectional frame beam column connection node with the characteristic of low damage and autonomous reset after earthquake.
Background
Since the 2008 Wenchuan major earthquake, the major earthquake frequently occurs at home and abroad, and many buildings collapse or are seriously damaged and cannot be repaired, so that disaster-stricken personnel live in tents or temporary buildings for a long time, and the recovery of psychological wounds is quite unfavorable. Psychological trauma of survivors, found in post-benign work of past major earthquakes, resulted largely from loss of homeland, homeless feeling, in addition to injury from loss of relatives. Therefore, research and development of novel buildings with low damage after earthquake and good repairability are important problems which are urgently needed to be solved in the current engineering earthquake-resistant field. The earthquake fortification of the building is not only required to meet the standard 'small earthquake is not damaged, medium earthquake is repairable, and large earthquake is not fallen', but also the earthquake fortification level is considered to be improved, the earthquake damage is lightened, and the repairability after the earthquake is improved.
In addition, the prefabricated concrete structure technology marked by the industrialization of the house has extremely wide application prospect because the prefabricated concrete structure technology accords with the sustainable development concept of green environment protection and low carbon. However, prefabricated concrete structural components are prefabricated in factories and assembled and connected in the field by specific node construction, and the seismic performance thereof has been a general concern. The current domestic related specifications mainly recommend an integral type equivalent cast-in-place connection mode, and the basic requirements of the current standard earthquake fortification can be met, but the requirements of reducing earthquake damage and rapidly repairing after earthquake are difficult to meet.
Therefore, the research and development of the novel prefabricated building system with good post-earthquake repairability accords with the environment-friendly concept of sustainable development, and accords with the important natural disaster monitoring and defending priority theme in the key field of the national long-term technological development outline related to public safety, if the obtained research result can be popularized and applied in engineering, the safety performance of the building structure can be effectively improved, the safety of houses is improved, the effective defending of earthquake disasters is realized, and the safety of lives and properties of people is ensured.
Disclosure of Invention
The invention designs an assembled concrete bidirectional frame beam column connecting node with the characteristic of low-damage autonomous reset after earthquake, and solves the technical problems that the current assembled integral frame beam column connecting node adopts a wet connecting node, the site construction is complex, the construction quality is difficult to control, the earthquake damage cannot be reduced, and the repairability after earthquake is improved.
In order to solve the technical problems, the invention adopts the following scheme:
a prefabricated assembled reinforced concrete bidirectional frame beam column node is characterized in that: the prefabricated frame columns (1) are continuous in the node areas, the bidirectional prefabricated frame beams (2) are discontinuous in the node areas, and the beam ends and column sides form contact surfaces. Pore channels (10) are reserved at the upper and lower reinforcement elevations corresponding to the bidirectional frame beams (2) in the frame column (1), reinforcing steel bars (4) are penetrated, two ends of each reinforcing steel bar are fixed on embedded steel pieces (8) at the sides of the corresponding directional frame beams (2), and the reinforcing steel bars can dissipate earthquake energy under the action of an earthquake and are easy to replace after the earthquake. And a pore canal (11) is reserved in the bidirectional frame beam (2) and near the shaft, a pore canal (9) is reserved in the frame column along the corresponding positions of the two directions (1), unbonded prestressed tendons (3) are arranged in the pore canals (9) and (11), and friction force is generated between the beam end and the column side by stretching the bidirectional unbonded prestressed tendons (3) so as to resist the shearing force of the frame beam end. Meanwhile, the unbonded prestressed tendons (3) are designed to keep elasticity under the action of rare earthquakes, so that the node can be ensured to return independently after the earthquakes. The prefabricated reinforced concrete frame structure system connected by the nodes can realize zero damage or slight damage in rare earthquakes, and can return automatically after the earthquakes, so that the earthquake resistance is greatly improved.
Further, steel pipes are pre-embedded in the pore channels (10) reserved at the positions corresponding to the elevation positions of the upper steel bars and the lower steel bars of the bidirectional frame beams (2) in the frame column (1), the steel bars (4) are penetrated, the inner diameter of the steel pipes is 2-3mm larger than the outer diameter of the steel bars (4), and unbonded micro-expansion materials are filled in the steel pipes to ensure that the steel bars (4) can freely slide in the pore channels (10). The end part of the reinforcing steel bar (4) is sleeved with wires, and the reinforcing steel bar is fixed on an embedded steel piece (8) on the side surface of the frame beam (2) by adopting nuts. The position of the pore canal (10) of the frame column (1) can ensure that the hot rolled steel bar (4) in the pore canal can be easily installed or detached, and the method can be realized by locally reducing the width of the beam at the corresponding position of the beam end of the frame if necessary.
Further, a reserved pore canal (11) of a corrugated pipe or a thin-wall steel pipe is adopted along the full span at the position near the middle shaft in the bidirectional frame beam (2), a reserved pore canal (9) of the corrugated pipe or the thin-wall steel pipe is adopted at the corresponding position of the two directions of the frame column (1), unbonded prestressed tendons (3) are arranged in the pore canals (9) and (11), the unbonded prestressed tendons are arranged in a through length mode, and the unbonded prestressed tendons are anchored at the sides of two end columns of a building. The number of unbonded prestressed tendons (3) and the tension control stress are determined according to calculation, so that the prestressed tendons can be ensured to keep elasticity under rare earthquakes corresponding to the fortification intensity.
Further, the prefabricated frame columns (1) are continuous in the node areas, the prefabricated frame beams (2) are discontinuous in the node areas, and the beam ends and column sides form contact surfaces. And a steel plate (6) is wrapped outside the beam end, a gap with the width of about 20mm is reserved between the beam end and the column side, and a high-strength shrinkage-free grouting material (7) is poured.
Further, angle steel (5) is arranged at the bottom elevation of the prefabricated frame column (1) side corresponding to the frame beam (2), and is fixed at the frame column (1) side through an anchor bolt (12) or an embedded steel bar for temporary support during hoisting of the prefabricated frame beam (2).
Further, the bidirectional pore channels (9) and (10) reserved in the frame column are staggered in height, so that smooth passing of the reinforcing steel bars (4) and the unbonded prestressed tendons (3) in two directions is ensured. Correspondingly, the reserved pore channels (11) in the two-direction frame beams are staggered in height, so that the prestressed tendons can pass through.
Furthermore, the unbonded prestressed tendons (3) are unbonded high-strength low-relaxation steel strands with the anti-corrosion lubricating grease and the polyethylene sheath wrapped outside, and the steel bars (4) are common hot-rolled steel bars.
Compared with the traditional assembled integral frame connecting node, the beam column connecting node of the prefabricated assembled concrete frame structure has the following beneficial effects:
(1) The beam column connecting node of the prefabricated concrete frame structure can effectively improve the earthquake resistance of the prefabricated concrete frame structure, lighten the earthquake damage of the structure, and can automatically recover the post-earthquake deformation of the structure, thereby greatly improving the post-earthquake repairability of the structure.
(2) The prestressed tendons adopt unbonded high-strength low-relaxation steel strands with the outer coating of the anti-corrosion lubricating grease and the polyethylene sheath, so that the prestressed tendons can slide relatively relative to frame beams and columns, and meanwhile, the dosage of the prestressed tendons is determined according to the fortification standard of keeping elasticity under rare earthquakes, so that the autonomous reset of a post-earthquake structure is ensured.
(3) The invention adopts the common hot-rolled steel bars arranged in the reserved pore canal in the frame column to dissipate earthquake energy, the cost is obviously lower than that of the buckling restrained brace, and meanwhile, the steel bars are easy to replace, so that the steel bars can become energy-consumption 'fuses' of the structure under the earthquake action.
(4) The invention belongs to a dry type connecting node, can realize on-site wet-free operation or little wet operation, has simple and convenient construction, low noise in the construction site, less dust emission and environmental protection, and is a novel prefabricated assembled concrete frame beam column connecting technology worth popularizing.
Drawings
Fig. 1: the invention relates to a vertical structural schematic diagram of a beam column node of a low-damage self-resetting assembled concrete frame;
fig. 2: FIG. 1 is a schematic cross-sectional view of a structure;
fig. 3: a schematic side elevation view of the prefabricated frame column of fig. 1;
fig. 4: the prefabricated frame beam in fig. 1 is schematically shown in cross-section.
Reference numerals illustrate:
1-prefabricating concrete frame columns; 2-prefabricating a concrete frame beam; 3-unbonded prestressed tendons; 4-common reinforcing steel bars; 5-angle steel; 6, a frame beam end steel plate; 7-high-strength non-shrinkage grouting material; 8, embedding steel pieces at the beam side; 9, reserving a prestressed tendon pore canal in the column; 10, reserving a common reinforcing steel bar pore canal in the column; 11-reserving prestressed tendon pore canals in the beam; 12-anchor bolts for fixing angle steel.
Detailed Description
The invention is further described with reference to fig. 1 to 4:
as shown in fig. 1 and 2, the connecting node comprises a precast concrete frame column (1) and a bidirectional precast concrete frame beam (2). The concrete frame column (1) can be prefabricated in multiple layers or in a single layer, the frame column (1) is arranged in a building layer along the joint part of the height, the concrete frame beams (2) in two directions continuously pass through the joint part of the beam column, the precast frame beams (2) are prefabricated in a single span mode, the precast frame beams (2) are discontinuous in the joint part, and the beam ends and the column sides serve as contact surfaces for joint connection. The beam end pre-buried steel plate (6) can play a role in protecting the beam end in the hoisting process, and can enhance and improve the bearing capacity of the beam end and reduce the damage degree of the beam end under the action of an earthquake. Gaps of about 20mm are reserved between the outer sides of the beam end steel plates and the column contact surfaces, and high-strength shrinkage-free grouting materials (7) are poured, so that the precast beams and columns can be tightly attached to the joint positions, and the shearing resistance is improved under the action of pre-stress.
The frame column (1) is connected with the bidirectional frame beam (2) through a reinforcing steel bar (4) and an unbonded prestressed reinforcement (3). The steel bars (4) are arranged along two directions, each steel bar penetrates through the frame column (1), two ends of each steel bar are fixed on the sides of the frame beams (2) in the corresponding directions, the steel bars (4) can dissipate seismic energy under the action of an earthquake, and the steel bars are easy to replace after the earthquake. The unbonded prestressed tendons (3) are arranged in the bidirectional frame beams (2) in a through length mode, penetrate through the frame columns (1) and are anchored at the two end column sides of the building. The two-way unbonded prestressed tendons (3) are tensioned to generate frictional resistance between the beam ends and the column sides so as to resist the shearing force of the beam ends of the frame. The number of unbonded prestressed tendons (3) and the tension control stress are determined according to calculation, so that the prestressed tendons (3) can be ensured to keep elasticity under rare earthquakes with corresponding fortification intensity.
As shown in fig. 1 and 3, the end of the steel bar (4) is sleeved with wires, passes through a pore canal (10) reserved in the frame column (1) and is fixed on an embedded steel piece (8) on the side surface of the frame beam (2) by adopting nuts. The steel pipe is embedded in the pore canal (10) of the frame column, the inner diameter of the steel pipe is 2-3mm larger than the outer diameter of the steel bar (4), and the unbonded micro-expansion material is filled, so that the steel bar (4) can freely slide in the pore canal (10). The position of the pore canal (10) of the frame column (1) can ensure that the hot rolled steel bar (4) in the pore canal can be easily installed or detached, and the method can be realized by locally reducing the width of the beam at the corresponding position of the beam end of the frame if necessary.
The middle and near-axis positions in the bidirectional frame beam (2) are reserved with pore passages (11) along the whole span by adopting corrugated pipes or thin-wall steel pipes, the corresponding positions in the two directions of the frame column (1) are reserved with pore passages (9) by adopting corrugated pipes or thin-wall steel pipes, and unbonded prestressed tendons (3) are arranged in the pore passages (9) and (11). The inner diameters of the channels (9) and (11) are determined according to the principle of being capable of accommodating the unbonded tendons (3) arranged.
As shown in fig. 3, the bidirectional channels (9) and (10) reserved in the frame column are staggered in height, so that the smooth passing of the reinforcing steel bars (4) and the unbonded prestressed tendons (3) in two directions is ensured. Correspondingly, as shown in fig. 1 and 4, the reserved pore channels (11) in the two-direction frame beams are staggered in height, so that the prestressed tendons can pass through.
As shown in fig. 1, angle steel (5) is arranged at the bottom elevation of the prefabricated frame column (1) side corresponding to the frame beam (2), and is fixed at the frame column (1) side through an anchor bolt (12) or an embedded steel bar for temporary support during hoisting of the prefabricated frame beam (2). In the case of a bi-directional frame, the angle steel (5) should be arranged along the periphery of the column. The specification and the number of the anchor bolts are determined according to calculation.
The specific implementation steps are as follows:
the first step: the construction and installation of the prefabricated frame structure are performed from bottom to top, firstly, the prefabricated frame column (1) at the layer is hoisted in place, then, each cross-prefabricated frame beam (2) is hoisted in sequence, the frame beams (2) can be temporarily positioned on the column side angle steel (5), and meanwhile, gaps of about 20mm are reserved between the beam ends and the column sides, so that necessary temporary supports are needed for ensuring stability;
and a second step of: the unbonded prestressed tendons (3) are subjected to field blanking, and the unbonded prestressed tendons are sequentially penetrated from the preformed holes (9) on the side surfaces of the end posts along two directions;
and a third step of: at each beam-column joint position, the hot-rolled steel bar (4) which is processed in advance passes through a reserved hole (10) on the column and further passes through a hole on a pre-buried steel piece (8) of the frame beam. The reserved holes (10) are filled with non-binding micro-expansion materials, and the openings are closed;
fourth step: pouring a high-strength shrinkage-free grouting material (7) in a gap between the beam end and the column side;
fifth step: after the high-strength shrinkage-free grouting material (7) reaches the design strength, installing an end part unbonded prestressed tendon anchor, and tensioning according to the design control stress;
sixthly, installing nuts at two ends of the hot rolled steel bar (4) and screwing;
seventh, the surface of the exposed steel piece is subjected to sealing treatment;
eighth step, the floor slab is installed in place;
ninth step: repeating the first step to the eighth step, and assembling the whole structure from bottom to top according to floors.
The invention has been described above by way of example with reference to the accompanying drawings, it is clear that the implementation of the invention is not limited to the above-described manner, but it is within the scope of the invention to apply the inventive concept and technical solution to other situations as long as various improvements made by the inventive concept and technical solution are adopted or without any improvement.
Claims (4)
1. A prefabricated assembled reinforced concrete bidirectional frame beam column node is characterized in that: the prefabricated frame columns (1) are continuous in the node areas, the bidirectional prefabricated frame beams (2) are discontinuous in the node areas, contact surfaces are formed between beam ends and column sides, pore channels (10) are reserved at the positions corresponding to the upper and lower reinforcement elevations of the bidirectional frame beams (2) in the frame columns (1), reinforcing steel bars (4) are penetrated, two ends of the reinforcing steel bars are fixed on pre-buried steel pieces (8) corresponding to the frame beams (2) in the directions, seismic energy can be dissipated by the reinforcing steel bars under the action of an earthquake, and the reinforced steel bars are easy to replace after the earthquake; a pore canal (11) is reserved in the bidirectional frame beam (2) and near the middle shaft, a pore canal (9) is reserved in the frame column along the corresponding positions of the two directions, unbonded prestressed tendons (3) are arranged in the pore canal, and friction force is generated between the beam end and the column side by stretching the bidirectional unbonded prestressed tendons (3) so as to resist the shearing force of the beam end of the frame; meanwhile, the unbonded prestressed tendons (3) are designed to keep elasticity under the action of rare earthquakes, so that the node can be ensured to return independently after the earthquakes; the prefabricated reinforced concrete frame structure system connected by the nodes can realize zero damage or slight damage in rare earthquakes, and can return automatically after the earthquakes, so that the earthquake resistance is greatly improved;
pre-burying steel pipes in pore channels (10) reserved at the positions corresponding to the elevation positions of the upper steel bars and the lower steel bars in the frame column (1), penetrating the steel bars (4), wherein the inner diameter of each steel pipe is 2-3mm larger than the outer diameter of each steel bar (4), and filling unbonded micro-expansion materials in the steel pipes to ensure that the steel bars (4) can freely slide in the pore channels (10); the end part of the steel bar (4) is sleeved with wires and is fixed on an embedded steel piece (8) on the side surface of the frame beam (2) by adopting nuts; the position of the pore canal (10) of the frame column (1) should ensure that the hot rolled steel bar (4) in the pore canal is easy to install or detach;
the prefabricated frame columns (1) are continuous in the node areas, the prefabricated frame beams (2) are discontinuous in the node areas, and the beam ends and column sides form contact surfaces; the beam end is wrapped with a steel plate (6), a gap with the width of about 20mm is reserved between the beam end and the column side, and a high-strength shrinkage-free grouting material (7) is poured;
and angle steel (5) is arranged at the bottom elevation of the prefabricated frame column (1) side corresponding to the frame beam (2), and is fixed at the frame column (1) side through an anchor bolt (12) or an embedded steel bar for temporary support during hoisting of the prefabricated frame beam (2).
2. The prefabricated reinforced concrete bi-directional frame beam column node of claim 1, wherein: the middle and near-axis positions in the bidirectional frame beam (2) adopt reserved pore passages (11) of corrugated pipes or thin-wall steel pipes along the whole span, the corresponding positions in two directions of the frame column (1) adopt reserved pore passages (9) of the corrugated pipes or the thin-wall steel pipes, unbonded prestressed tendons (3) are arranged in the pore passages, and the unbonded prestressed tendons are arranged in a full length mode and anchored at the two end column sides of the building; the number of unbonded prestressed tendons (3) and the tension control stress are determined according to calculation, so that the prestressed tendons can be ensured to keep elasticity under rare earthquakes corresponding to the fortification intensity.
3. The prefabricated reinforced concrete bidirectional frame beam-column node of claim 2, wherein: the bidirectional pore channels reserved in the frame columns are staggered in height, so that the steel bars (4) and the unbonded prestressed tendons (3) in two directions can pass smoothly, and correspondingly, the pore channels (11) reserved in the frame beams in two directions are staggered in height, so that the unbonded prestressed tendons (3) can pass.
4. A prefabricated reinforced concrete bi-directional frame beam column node according to claim 3, wherein: the unbonded prestressed tendons (3) are unbonded high-strength low-relaxation steel strands with the outer layers of anti-corrosion lubricating grease and polyethylene jackets, and the steel bars (4) are common hot-rolled steel bars.
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| CN201610621964.7A CN107237402B (en) | 2016-08-02 | 2016-08-02 | Low-damage self-resetting assembled concrete bidirectional frame beam column node |
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| CN201610621964.7A CN107237402B (en) | 2016-08-02 | 2016-08-02 | Low-damage self-resetting assembled concrete bidirectional frame beam column node |
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| CN107237402B true CN107237402B (en) | 2023-04-28 |
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