CN105625571A - Prefabricated concrete beam-column joint using medium-strength prestressed tendons - Google Patents

Prefabricated concrete beam-column joint using medium-strength prestressed tendons Download PDF

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Publication number
CN105625571A
CN105625571A CN201610112672.0A CN201610112672A CN105625571A CN 105625571 A CN105625571 A CN 105625571A CN 201610112672 A CN201610112672 A CN 201610112672A CN 105625571 A CN105625571 A CN 105625571A
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China
Prior art keywords
precast concrete
strength prestressed
concrete beam
column
node
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CN201610112672.0A
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CN105625571B (en
Inventor
冯健
陈耀
蔡建国
张晋
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Southeast University
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Southeast University
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/20Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
    • E04B1/21Connections specially adapted therefor
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/20Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
    • E04B1/22Structures 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

Abstract

The invention discloses a prefabricated concrete beam-column joint using medium-strength prestressed tendons. The joint comprising a prefabricated concrete beam, a prefabricated concrete column, medium-strength prestressed tendons, a joint area post-cast section, beam-top common stressed rebars and intra-column vertical rebars. The bottom of the beam is provided with only the medium-strength prestressed bars that extend out of the beam end and are bent up after passing through the midline of the prefabricated column to form hooks, reliably anchored to a joint core area, and the prefabricated concrete beam-column joint is formed with the prefabricated concrete beam and column through post-cast concrete. The invention reduces production and construction difficulty, decreases the sectional height and steel usage of the prefabricated concrete beam and ensures integrity and aseismic performance of the beam-column joint.

Description

The precast concrete bean column node of strength prestressed muscle in a kind of employing
Technical field
The present invention relates to the precast concrete bean column node connecting structure of strength prestressed muscle in a kind of employing, belong to civil engineering precast concrete technical field.
Background technology
Frame structure is mainly built-up by beam, post and bean column node, belongs to a kind of version most widely used in architectural engineering. Precast prestressed concrete prefabricated integral frame structure meets the requirement of " building industrialization, housing industrialization " and green building. Such structural system has that speed of application is fast, environmental pollution is little, quality is guaranteed and the advantage such as good endurance, also has and is easy to adopt the outstanding features such as pre-tensioned prestressing technology, member section reduce, node construction is relatively simple, steel using amount is relatively low.
The core technology of precast prestressed concrete prefabricated integral frame structure is the Joint's connection fabrication form of precast concrete beam and precast concrete column, and its quality directly influences ultimate bearing capacity and the anti-seismic performance etc. of this class formation. Beam-ends is provided with keyway or U-shaped groove by current existing pre-fabricated one bean column node interconnection technique, it be furnished with presstressed reinforcing steel and regular reinforcement simultaneously, sometimes U-shaped reinforcing bar it is aided with, mutually overlap, be anchored in joint cores, and the section of watering adopts concrete cast-in-situ that precast concrete beam, post are formed an entirety behind node area. Or at the bottom of beam, adopting high tensile reinforcement, and in joint cores, place additional bar, but there is the deficiencies such as cost relatively big, construction operation space deficiency, ductility of joint performance shortcoming to some extent. Above precast frame bean column node interconnection technique has the problem such as suitability deficiency, construction inconvenience more, and this makes the application advantage of precast prestressed concrete prefabricated integral frame structure and inconspicuous.
How to build that stress performance is good, construction measure rationally, New Types of Beam column Connections connecting structure easily of constructing, be always up the technological difficulties of precast prestressed concrete prefabricated integral frame structure.
Summary of the invention
Technical problem: the invention provides and a kind of manufacture the precast concrete bean column node of strength prestressed muscle in the employing that difficulty is low, it is convenient to construct, type of attachment is simple, stress is clear and definite.
Technical scheme: the precast concrete bean column node of strength prestressed muscle in the employing of the present invention, including the section of watering after node region, it is arranged on the precast concrete beam at the horizontal two ends of the section of watering after described node region, it is arranged on the precast concrete column at the upper and lower two ends of the section of watering after node region, after described precast concrete beam and node region, the section of watering is provided above cast-in-place region, composite beam top, described wishing is furnished with longitudinal reinforcement in concrete column, described composite beam top is furnished with common steel bar stress in cast-in-place region, the bottom of precast concrete beam is strength prestressed muscle in being only furnished with, in described, strength prestressed muscle stretches out the end of precast concrete beam, and continue to stretch into the section of watering after node region, after exceeding node region the center line of the section of watering backward on bend up formation crotch, it is anchored in after node region in the section of watering.
Further, in the present invention, in described, the tensile strength of strength prestressed muscle is 700MPa��1300MPa, and in described, the percentage of total elongation under the maximum, force of strength prestressed muscle is not less than 5%, and in described, the diameter of strength prestressed muscle adopts 6mm��30mm.
Further, in the present invention, in precast concrete beam, in the strong transformed area A such as grade of strength prestressed muscleS convertsFor 0.2A 's��0.8A 's, wherein A 'sFor the total cross-sectional area of the common steel bar stress in top of described precast concrete beam, AS convertsTotal cross-sectional area A according to muscle strength prestressed in being furnished with in precast concrete beamsThrough waiting strong conversion to obtain.
Beneficial effect: compared with prior art, the invention have the advantages that
(1) common steel bar stress is configured in conventional precast concrete beam, the span ability of beam is poor, in order to improve span ability, presstressed reinforcing steel and common steel bar stress it is furnished with in precast prestressed concrete beam, to meet the control requirements such as the crack of beams of concrete, tension, causing component cost higher, in effective cast-in-place construction space, connection and the construction operation difficulty of node region are very big. And the present invention is only furnished with bottom precast beam there is strength prestressed muscle in better percentage elongation, do not need the common steel bar stress of additional configuration, still the bearing capacity equal with cast-in-place concrete frame structure and anti-seismic performance are reached, reduce beam section or the steel using amount of precast beam, thus the cost of component, difficulty of construction significantly reduce, reach the purpose of meterial saving and high efficiency.
(2) common steel bar stress need not be configured bottom precast beam, reduce the complexity of precast concrete bean column node nucleus on the one hand, be conducive to the overlap joint connection between steel bar stress bottom beam, it is significantly reduced the making of precast concrete beam, production difficulty on the other hand, improves convenience and the high efficiency of site operation.
(3) steel bar stress at the bottom of beam is folded upward at after stretching out beam-ends and crossing prefabricated post centrage, reliably anchor in joint core region, water formation bean column node through concrete is whole, under the premise of the globality and anti-seismic performance that ensure bean column node, this connecting structure is relatively simple, and stress is clear and definite.
Accompanying drawing explanation
Fig. 1 be the present invention employing in the precast concrete bean column node connection diagram of strength prestressed muscle.
Fig. 2 is the profile in the cast-in-place region of precast concrete beam and composite beam top in Fig. 1.
Wherein: 1 is precast concrete beam, 2 is the cast-in-place region, top of composite beam, 3 is strength prestressed muscle in being furnished with bottom precast concrete beam, 4 is precast concrete column, 5 is the section of watering behind precast beam Column border node region, 6 is the common steel bar stress in back portion, and 7 is longitudinal reinforcement in prefabricated post, and 8 is stirrup.
Detailed description of the invention
Below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described further:
Fig. 1 be the present invention employing in the precast concrete bean column node of strength prestressed muscle connect signal, and Fig. 2 correspond to the profile in the cast-in-place region of precast concrete beam and composite beam top in Fig. 1. As shown in Figure 1 and Figure 2, the precast concrete bean column node of strength prestressed muscle in employing, including precast concrete beam 1, cast-in-place region, composite beam top 2, in longitudinal reinforcement 7 in the section of watering 5, the common steel bar stress 6 in back portion and post after strength prestressed muscle 3, precast concrete column 4, node region. In Fig. 1, the bottom of precast concrete beam 1 is strength prestressed muscle 3 in being only furnished with, and described presstressed reinforcing steel 3 stretches out beam-ends, and the centrage that continues through precast concrete column 4 backward on bend up formation crotch, be reliably anchored in behind bean column node region in the section of watering 5. Described precast concrete beam 1, in strength prestressed muscle 3 and precast concrete column 4 realize being reliably connected of precast concrete beam and precast concrete column by the concrete of rear cast, and form precast concrete bean column node.
As it is shown in figure 1, the tensile strength of strength prestressed muscle 3 is 700MPa��1300MPa in described, for instance value 750Mpa, in described, the percentage of total elongation under the maximum, force of strength prestressed muscle 3 is not less than 5%, and in described, the diameter of strength prestressed muscle 3 adopts 6mm��30mm. The intensity of tradition presstressed reinforcing steel is higher, but the percentage of total elongation under its maximum, force is relatively low (being about 3.5%), far below common steel bar stress, when only configuring high strength wire, anti-seismic performance is poor, therefore generally need to be aided with common steel bar stress, improve the ductility of precast concrete beam-ends plastic hinge region. And present invention advantage of strength prestressed muscle in making full use of, while avoiding configuring common steel bar stress, still the bearing capacity equal with cast-in-place concrete frame structure and anti-seismic performance are reached, reduce beam section or the steel using amount of precast beam, thus the cost of component, difficulty of construction significantly reduce, reach the purpose of meterial saving and high efficiency.
As in figure 2 it is shown, the bottom of every precast concrete beam 1 need not configure common steel bar stress, the radical of strength prestressed muscle 3 in being furnished with, strength grade are all identical, and described in strength prestressed muscle 3 etc. strong transformed area AS convertsFor 0.2A 's��0.8A 's, wherein A 'sFor the total cross-sectional area of the common steel bar stress 6 in top of described precast concrete beam 1, AS convertsTotal cross-sectional area A according to muscle 3 strength prestressed in being furnished with in precast concrete beam 1sThrough waiting strong conversion to obtain. When its medium strong conversion refers to different grade of steel Reinforcement Replacement, the principle equal by intensity replaces, and need to consider the strength failure criterion of different reinforcing bar. When precast concrete beam 1 is applied to highly seismic region, still should increase and common steel bar stress is set; When depth of beam is higher, the both sides of beam should arrange waist muscle, and stirrup 8 adopts closed stirrup. In at the bottom of beam the distribution of strength prestressed muscle 3 should disperse, symmetrical; Its anchorage length in joint core region and thickness of concrete cover should meet the relevant regulatory requirements of national existing industry standard and national regulation.
During site operation, after precast concrete beam 1 and precast concrete column 4 hoisted in position, the two ends of precast concrete beam 1 are held on the both sides, top of precast concrete column 4, it is aided with temporary support, template etc., by longitudinal reinforcement 7 and stirrup 8 installation in strength prestressed muscle 3, the common steel bar stress 6 in top, post in bottom beam, and adopt concreting, form precast concrete bean column node.
Below schematically the present invention and embodiment thereof being described, this description does not have restricted, is one of embodiments of the present invention shown in accompanying drawing 1 Fig. 2. When presently disclosed connected mode is applied to more generally frame structure bean column node, can according to actual beam-to-column joint mode (as Top-Exterior Columns of PC, top layer center pillar, layer side column etc.), muscle radical strength prestressed in node region and distribution form are appropriately adjusted. Therefore, if others skilled in the art are when without departing from the invention objective, adopt the means of structural connection similar to this technical scheme and embodiment, protection scope of the present invention all should be belonged to.

Claims (3)

1. the precast concrete bean column node of strength prestressed muscle in an employing, it is characterized in that, this node includes the section of watering (5) after node region, it is arranged on the precast concrete beam (1) at the section of watering (5) horizontal two ends after described node region, it is arranged on the precast concrete column (4) at the section of watering (5) two ends up and down after node region, after described precast concrete beam (1) and node region, the section of watering (5) is provided above cast-in-place region, composite beam top (2), described wishing is furnished with longitudinal reinforcement (7) in concrete column (4), cast-in-place region, described composite beam top (2) is furnished with common steel bar stress (6), the bottom of precast concrete beam (1) be only furnished with in strength prestressed muscle (3), in described, strength prestressed muscle (3) stretches out the end of precast concrete beam (1), and continue to stretch into the section of watering (5) after node region, after exceeding node region the center line of the section of watering (5) backward on bend up formation crotch, it is anchored in after node region in the section of watering (5).
2. the precast concrete bean column node of strength prestressed muscle in employing according to claim 1, it is characterized in that, in described, the tensile strength of strength prestressed muscle (3) is 700MPa��1300MPa, in described, the percentage of total elongation under the maximum, force of strength prestressed muscle (3) is not less than 5%, and in described, the diameter of strength prestressed muscle (3) adopts 6mm��30mm.
3. the precast concrete bean column node of strength prestressed muscle in employing according to claim 1, it is characterised in that in described precast concrete beam (1), in the strong transformed area A such as grade of strength prestressed muscle (3)S convertsFor 0.2A 's��0.8A 's, wherein A 'sFor the total cross-sectional area at the common steel bar stress in the top (6) of described precast concrete beam (1), AS convertsAccording to the total cross-sectional area A of strength prestressed muscle (3) in being furnished with in precast concrete beam (1)sThrough waiting strong conversion to obtain.
CN201610112672.0A 2016-02-29 2016-02-29 The precast concrete bean column node of strength prestressed muscle in a kind of use Active CN105625571B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107090908A (en) * 2017-05-09 2017-08-25 广东省建筑科学研究院集团股份有限公司 A kind of new vertical prefabricated components joint connecting method
CN110241915A (en) * 2019-05-07 2019-09-17 济南大学 A kind of assembly concrete beam column L-type muscle integrated connection node and application method

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN107090908A (en) * 2017-05-09 2017-08-25 广东省建筑科学研究院集团股份有限公司 A kind of new vertical prefabricated components joint connecting method
CN107090908B (en) * 2017-05-09 2019-11-19 广东省建筑科学研究院集团股份有限公司 A kind of vertical prefabricated components joint connecting method
CN110241915A (en) * 2019-05-07 2019-09-17 济南大学 A kind of assembly concrete beam column L-type muscle integrated connection node and application method

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