CN103924678A - Precast concrete beam and round concrete-filled steel tube column combining joint employing unbonded prestressed and ordinary reinforcement for connection - Google Patents
Precast concrete beam and round concrete-filled steel tube column combining joint employing unbonded prestressed and ordinary reinforcement for connection Download PDFInfo
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- CN103924678A CN103924678A CN201410149372.0A CN201410149372A CN103924678A CN 103924678 A CN103924678 A CN 103924678A CN 201410149372 A CN201410149372 A CN 201410149372A CN 103924678 A CN103924678 A CN 103924678A
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Abstract
The invention relates to a precast concrete beam and round concrete-filled steel tube column combining joint employing unbonded prestressed and ordinary reinforcement for connection and belongs to the technical field of building structures. Both a round concrete-filled steel tube column and a reinforced concrete beam are precast. The parts, corresponding to the beam section, of the precast reinforced concrete beam and the round concrete-filled steel tube column are provided with ducts in which metal bellows are embedded. Ring plates are welded at the connection of the round concrete-filled steel tube column and the reinforced concrete beam. Steel channels are welded on the round concrete-filled steel tube column. Ordinary rebars and prestressed rebars are passed through the metal bellows, and the prestressed rebars are tensioned so that the beam and the column are integrated. The precast concrete beam and round concrete-filled steel tube column combining joint employing unbonded prestressed and ordinary reinforcement for connection has the advantages that construction speed is high, the field welding process is not required, joint connection reliability can be guaranteed, seismic performance is good, and the joint has promising application prospect.
Description
Technical field
The present invention relates to prestressing without bondn and be connected precast concrete beam concrete-filled circular steel tube column combined joint with plain bars, belong to building structure technology field.
Background technology
In construction work, apply the concrete filled steel tube history of existing more than 100 year.The attention that bearing capacity is high owing to having for concrete filled steel tube, plasticity and the advantage such as good toughness, good economical benefit and easy construction are subject to engineering circles.Concrete filled steel tube can adapt to modern project structure to greatly across, towering, heavy duty development with bear the needs of mal-condition, meet the industrial requirement of Modern Construction Technology, thereby be just more and more widely used in individual layer and multi storied industrial factory building post, equipment frame post, pier, stake, space structures, commercial square, multistory office and house, high level and super highrise building and bridge construction, obtain good economic effect and architectural effect.Especially in recent years, undergoing an unusual development rapidly of China's encased structures, also more and more to the research of encased structures.
The connected node of steel core concrete column and beam is one of key issue while carrying out concrete filled steel tube engineering design, and the validity of its connected node directly affects integrally-built rigidity, stability and supporting capacity, also has influence on site operation difficulty and construction speed.Existing concrete filled steel tube joint form is various, complex structure mostly, and difficulty of construction is large, and power transmission is indefinite, and node computation model is indefinite, and China does not also have a set of more complete node theory of computation and method for designing so far.Therefore, a kind of novel on-the-spot simple and fast of installing that has of research and development, less demanding to operating personnel's technology and construction environment, connect safe and reliable steel core concrete column and girder connection form, seem very necessary.
Unbonded prestressing tendon is the special presstressed reinforcing steel with anticorrosion separation layer and oversheath, and it has easy construction, low for equipment requirements, loss of prestress is little, resistance to corrosion is strong, antifatigue and the advantage such as anti-seismic performance is good.In operational phase, presstressed reinforcing steel, in elastic state, makes structure have very strong automatic recovery ability, and permanent set is little, has good anti-seismic performance.Therefore be widely used in building structure.
Summary of the invention
The object of the invention is to ensureing under the prerequisite that node connects effectively, power transmission is clear and definite, by improving precast reinforced concrete beam and Frame Joints of Concrete-Filled Steel Tube connected mode, adopt unbonded prestressing tendon and plain bars to assemble, reduced difficulty of construction, accelerated construction speed.Speed of application of the present invention is fast, does not need On-site Welding Technology, and can ensure the reliability that node connects, and has good anti-seismic performance, and this node connected mode both can, for the side column node in structure, also can, for king post joint, have a extensive future.
For achieving the above object, the technical solution used in the present invention is that prestressing without bondn is connected precast concrete beam concrete-filled circular steel tube column combined joint with plain bars, as shown in Figure 1, 2, this node comprises concrete-filled circular steel tube column, reinforced concrete beam, unbonded prestressing tendon, plain bars, ring flat-plate, channel-section steel.Concrete-filled circular steel tube column (1) and reinforced concrete beam (2) are prefabricated, and the two connects by unbonded prestressing tendon (3) and plain bars (4); Upper and reinforced concrete beam (2) the junction welding ring flat-plate (5) at concrete-filled circular steel tube column (1), ring flat-plate has corresponding hole on (5); Channel-section steel (6) is welded in round steel pipe; The position of reinforced concrete beam, the corresponding beam section of concrete-filled circular steel tube column is stayed and is established duct, and near built-in metal bellows (7) in the duct of beam upper and lower surface, after in metal bellows (7), wear plain bars (4), in intermetallic metal bellows (7), wear unbonded prestressing tendon (3), stretch-draw unbonded prestressing tendon (3) thus by beam column composition entirety.
Described ring flat-plate (5) is general steel plate, and width is beam section height, and thickness is thickness of steel pipe.
Described channel-section steel (6) web height is beam section width, and flange width is beam section height, and channel-section steel length is beam section height, and the web of channel-section steel is slit into the radian identical with round steel pipe, so that welding when contacts completely with round steel pipe.
After wear plain bars (4), be mainly used to the bending resistance of the energy dissipation capacity and the assisted Extraction high node that increase node, after wear plain bars reserving hole channel adopt bellows, to wear bonding, the anchoring property of nonprestressed reinforcement after increasing.
No-cohesive prestressed reinforcement (3) can provide the clamping force of beam column interface, resist the node vertical shear due to vertical load on beam and horizontal earthquake action generation by this clamping force, this clamping force also makes structure have good automatic recovery ability simultaneously, and the permanent set of structure is dwindled.
At the ring flat-plate (5) of the end of side column, the bearing plate while can be used as no-cohesive prestressed reinforcement stretch-draw, simultaneously also can after wear plain bars (4) and be welded on this ring flat-plate, after meeting, wear the anchoring requirement of reinforcing bar.
Adopt this node site operation speed fast, and can ensure the reliability that node connects.This node adopts ring flat-plate, the weakening effect to bearing capacity can alleviate round steel pipe and punch time; Adopt channel-section steel can increase the shear-carrying capacity of bean column node; Adopt no-cohesive prestressed reinforcement, loss of prestress is little, anti-fatigue performance is good, presstressed reinforcing steel is in elastic state, make structure have very strong automatic recovery ability, permanent set is little, has good anti-seismic performance, this brings huge economic benefit to economy and the social development of China, has a extensive future.
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Brief description of the drawings
Fig. 1 is middle node front elevation view
Fig. 2 is mid-side node elevation
Fig. 3 is the sectional view of Fig. 1 along A-A
Fig. 4 is the sectional view of Fig. 2 along B-B
Fig. 5 is the sectional view of Fig. 2 along C-C
Fig. 6 is the sectional view of Fig. 1 along D-D
In figure, the 1st, concrete-filled circular steel tube column, the 2nd, precast reinforced concrete beam, the 3rd, unbonded prestressing tendon, the 4th, plain bars, the 5th, ring flat-plate, the 6th, channel-section steel, the 7th, metal bellows.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As shown in Fig. 1-6.
Embodiment 1
Prestressing without bondn is connected precast concrete beam concrete-filled circular steel tube column combined joint and constructs as shown in Figure 1 with plain bars:
1, the making of concrete filled steel tube and reinforced concrete beam
In factory in strict accordance with related specifications and drawing making concrete-filled circular steel tube column (1) and reinforced concrete beam (2), when prefabricated, all reserve 6 corresponding ducts, duct internal diameter is than the large 10mm of unbonded prestressing tendon (3) diameter, near built-in metal bellows (7) in the duct of lower section on beam, at the upper tie-beam of concrete-filled circular steel tube column (1), place adopts weld all around mode to weld ring flat-plate (5) and channel-section steel (6).
2, the assembling of bean column node
Behind concrete-filled circular steel tube column (1) location, make reinforced concrete beam (2) lifting location by support.
3, unbonded prestressing tendon and plain bars lashing
In bellows (7), wear plain bars (4), lashing finishes post-grouting.In intermetallic metal bellows (7), wear unbonded prestressing tendon (3).
4, stretch-draw unbonded prestressing tendon
Stretch-draw unbonded prestressing tendon (3) when slurry intensity reaches design strength, stretch-draw adopts symmetrical stretching mode, and stretch-draw line of action of force overlaps with duct center line.Stretch-draw control adopts stress and stretch value dual control, and stressing sequence is 0 → 10% σ
con→ 100% σ
con→ 103% σ
con→ anchoring.，
5, cutting
After stretch-draw finishes, adopt portable grinder cutting machine will expose presstressed reinforcing steel excision, its protruded length should not be less than 1.5 times of presstressed reinforcing steel diameter, and is not less than 30mm.
Embodiment 2
When for side column node, see Fig. 2, other measure, with embodiment 1, is in the end of side column, bearing plate when ring flat-plate (5) can be used as no-cohesive prestressed reinforcement (3) stretch-draw, simultaneously also can after wear plain bars (4) and be welded on this ring flat-plate, after meeting, wear the anchoring requirement of reinforcing bar.
Claims (4)
1. prestressing without bondn is connected precast concrete beam concrete-filled circular steel tube column combined joint with plain bars, it is characterized in that: this node comprises concrete-filled circular steel tube column (1), reinforced concrete beam (2), unbonded prestressing tendon (3), plain bars (4), ring flat-plate (5), channel-section steel (6); Concrete-filled circular steel tube column (1) and reinforced concrete beam (2) are prefabricated, and the two connects by unbonded prestressing tendon (3) and plain bars (4); Upper and reinforced concrete beam (2) the junction welding ring flat-plate (5) at concrete-filled circular steel tube column (1), ring flat-plate has corresponding hole on (5); Channel-section steel (6) is welded in round steel pipe; The position of reinforced concrete beam, the corresponding beam section of concrete-filled circular steel tube column is stayed and is established duct, and near built-in metal bellows (7) in the duct of beam upper and lower surface, after in metal bellows (7), wear plain bars (4), in intermetallic metal bellows (7), wear unbonded prestressing tendon (3), stretch-draw unbonded prestressing tendon (3) thus by beam column composition entirety.
2. prestressing without bondn according to claim 1 is connected precast concrete beam concrete-filled circular steel tube column combined joint with plain bars, it is characterized in that: node connects employing unbonded prestressing tendon (3) and mixes and be connected with plain bars (4).
3. prestressing without bondn according to claim 1 is connected precast concrete beam concrete-filled circular steel tube column combined joint with plain bars, it is characterized in that: ring flat-plate (5) is general steel plate, and width is beam section height, and thickness is thickness of steel pipe.
4. prestressing without bondn according to claim 1 is connected precast concrete beam concrete-filled circular steel tube column combined joint with plain bars, it is characterized in that: described channel-section steel (6) web height is beam section width, flange width is beam section height, channel-section steel length is beam section height, the web of channel-section steel is slit into the radian identical with round steel pipe, so that welding when contacts completely with round steel pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410149372.0A CN103924678A (en) | 2014-04-14 | 2014-04-14 | Precast concrete beam and round concrete-filled steel tube column combining joint employing unbonded prestressed and ordinary reinforcement for connection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410149372.0A CN103924678A (en) | 2014-04-14 | 2014-04-14 | Precast concrete beam and round concrete-filled steel tube column combining joint employing unbonded prestressed and ordinary reinforcement for connection |
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| CN103924678A true CN103924678A (en) | 2014-07-16 |
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| CN201410149372.0A Pending CN103924678A (en) | 2014-04-14 | 2014-04-14 | Precast concrete beam and round concrete-filled steel tube column combining joint employing unbonded prestressed and ordinary reinforcement for connection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111255098A (en) * | 2020-02-10 | 2020-06-09 | 湖南省西城建设有限公司 | Concrete-filled steel tubular column and cast-in-place reinforced concrete beam joint and construction method thereof |
| CN115450374A (en) * | 2022-10-24 | 2022-12-09 | 南通联泷装配式建筑科技有限公司 | Square steel column and reinforced concrete combined beam and preparation method thereof |
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| JP2000144906A (en) * | 1998-09-07 | 2000-05-26 | Sumitomo Metal Ind Ltd | Column/beam joint section between cft structural column and src structural beam and beam main bar fixing metal fixture |
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| CN101798849A (en) * | 2010-03-26 | 2010-08-11 | 东南大学 | Node connection device for self-centering prestressed concrete frame |
| CN103132602A (en) * | 2013-02-27 | 2013-06-05 | 同济大学 | Self-resetting frame joint |
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2014
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Patent Citations (7)
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| JP2000144906A (en) * | 1998-09-07 | 2000-05-26 | Sumitomo Metal Ind Ltd | Column/beam joint section between cft structural column and src structural beam and beam main bar fixing metal fixture |
| CN2436578Y (en) * | 2000-06-16 | 2001-06-27 | 王关根 | Universal joint device for steel structure building |
| CN2797476Y (en) * | 2005-04-22 | 2006-07-19 | 北京工业大学 | Mixed jointing node of assembled concrete frame structure beam column |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111255098A (en) * | 2020-02-10 | 2020-06-09 | 湖南省西城建设有限公司 | Concrete-filled steel tubular column and cast-in-place reinforced concrete beam joint and construction method thereof |
| CN115450374A (en) * | 2022-10-24 | 2022-12-09 | 南通联泷装配式建筑科技有限公司 | Square steel column and reinforced concrete combined beam and preparation method thereof |
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Application publication date: 20140716 |
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