CN109610877B - Node and method for improving crack resistance of prefabricated concrete frame structure - Google Patents
Node and method for improving crack resistance of prefabricated concrete frame structure Download PDFInfo
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- CN109610877B CN109610877B CN201910103981.5A CN201910103981A CN109610877B CN 109610877 B CN109610877 B CN 109610877B CN 201910103981 A CN201910103981 A CN 201910103981A CN 109610877 B CN109610877 B CN 109610877B
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- 239000004567 concrete Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000003733 fiber-reinforced composite Substances 0.000 claims abstract description 16
- 238000005336 cracking Methods 0.000 claims abstract description 9
- 239000000853 adhesive Substances 0.000 claims description 18
- 230000001070 adhesive effect Effects 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 230000002787 reinforcement Effects 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 3
- 230000002708 enhancing effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 4
- 239000011241 protective layer Substances 0.000 description 8
- 230000003014 reinforcing effect Effects 0.000 description 4
- 238000007788 roughening Methods 0.000 description 4
- 239000000084 colloidal system Substances 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011178 precast concrete Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 229920002748 Basalt fiber Polymers 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004826 seaming Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
-
- 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
- E04B1/19—Three-dimensional framework structures
- E04B1/1903—Connecting nodes specially adapted therefor
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
Abstract
The application discloses a node and a method for improving the cracking resistance of a prefabricated assembled concrete frame structure (PC frame structure for short). The application reserves the channel on the side surface of the beam near the joint and installs the fiber reinforced composite board strip, which can improve the crack resistance and durability of the joint part and further prolong the whole life service cycle of the frame structure. The application is suitable for node assembly of PC frame structure, convenient in construction and obvious in effect, and has wide application prospect.
Description
Technical Field
The application belongs to the field of buildings, relates to a prefabricated concrete frame structure (PC frame structure for short), and particularly relates to a node and a method for improving crack resistance of the prefabricated concrete frame structure.
Background
The reinforced concrete frame node comprises a node core area where the beam and the column intersect and adjacent beam ends and column ends, and plays roles of transmitting internal force and maintaining structural integrity in the frame structure.
The PC frame structure has the advantages of good quality, high production efficiency, low labor intensity of workers and the like, and the precast beams and the columns are connected in the node area. Compared with the cast-in-place concrete structure, the connecting part of the PC frame structure is a weak durability part due to the inherent lack of crack resistance.
The connection form of the PC frame structure can be mainly classified into two types of wet connection and dry connection according to the construction method. The wet connection is a mainstream treatment mode, namely field operation connection, wherein reinforcing steel bars, steel plates or bolts which are pre-stretched at the joint parts are welded, lapped or mechanically connected, and then the joint is realized by casting concrete or other joint grouting slurry on site. In the method, the precast concrete member and the subsequent cast-in-place concrete are only bonded, cannot be truly integrated, cannot avoid the generation of cracks at the joint, easily become a seepage water channel, cause corrosion of the precast assembled building material, even cause safety accidents, and cause hidden danger to resident property and life safety. Therefore, effective crack-resistant measures are necessary for these splice sites.
Disclosure of Invention
The application provides a node and a method for improving the crack resistance of a prefabricated concrete frame structure, which are characterized in that a plurality of channels are reserved in a beam side concrete protective layer near a joint, and fiber reinforced composite battens are arranged to improve the crack resistance at the joint, so that the durability of the structure is improved and the service period of the structure is prolonged. The application is suitable for various beam column joints of PC frame structures, has convenient construction and obvious effect, and has wide application prospect.
The technical scheme of the application is as follows:
the node for improving the cracking resistance of the prefabricated concrete frame structure comprises a concrete frame node finished by using the existing assembly method and technology, a plurality of channels reserved in a beam side concrete protection layer near the joints of the node, and fiber reinforced composite battens arranged in the channels by using structural adhesive. The structure can strengthen the connection of the prefabricated structures at two sides of the splice, and improve the crack resistance of the splice.
Preferably, the number of said channels provided in the side concrete protection layer of each of said beams is plural, and correspondingly the number of said strips is plural.
Preferably, the panel is a single web or an integral body made of a plurality of webs glued together by structural glue.
Preferably, the cross section of the strip is a rectangular cross section, the width b thereof f Taking 12-16 mm of total thickness t f Taking 6-8 mm, the length of the batten extends from the edge joint to two sides by 10-12 b respectively f Length. The parameters are determined comprehensively according to experience, the size of a single thin plate strip and the like, and the cracking resistance can be better met.
Preferably, the channels are symmetrically and parallelly arranged along the axis of the beam, and take 80-100 mm along the height direction of the beam, and the distance from the flange surface of the beam is not higher than 1/4 of the height of the beam and not lower than 40mm. This arrangement can give better crack resistance.
Preferably, the channel size is determined as follows: the length of the channel is the length of the slat; channel depth strip width b f 1.5 times of (2); channel width strip thickness 2t f And (t) f +6mm) larger. This arrangement can give better crack resistance.
Preferably, the strips are mounted with their width along the depth of the channel and centrally mounted in the channel by means of a structural adhesive.
A method for improving the cracking resistance of prefabricated concrete frame includes such steps as designing and making strips, reserving a number of channels in the protecting layer of concrete on beam side near the seam, assembling concrete frame nodes by existing assembling method and technology, and installing strips in said channels by structural adhesive.
Preferably, the number, length and cross-sectional dimensions of the fiber reinforced composite panels are determined according to the cross-sectional dimensions and reinforcement conditions of the beams at the joints.
Preferably, the length of the fiber reinforced composite panel and its dimensions are determined as follows:
the cross-section of the strip is preferably rectangular, the width b thereof f Taking 12-16 mm of total thickness t f Taking 6-8 mm; the length of the batten extends from the edge joint to two sides for 10 to 12b respectively f Length.
Preferably, the panel is a single web; or when the thickness of the single veneer sheet does not meet the set thickness, the veneer sheet can be manufactured by adhering a plurality of veneer sheets by using structural adhesive.
Preferably, the channel size and arrangement is determined according to the number and size of the slats.
Preferably, the channels are symmetrically and parallelly arranged along the axis of the beam, and take 80-100 mm along the height direction of the beam, and the distance from the flange surface of the beam is not higher than 1/4 of the height of the beam and not lower than 40mm.
Preferably, the channel size is determined as follows: the length of the channel is the length of the batten; the depth of the channel is the width b of the strip f 1.5 times of (2); the width of the channel is 2t of the thickness of the strip f And (t) f +6mm) larger; the inner wall of the channel is processed into a rough surface so that the concrete is fully meshed with the colloid.
Preferably, the width of the strip is mounted centrally into the channel along the depth of the channel by means of a structural adhesive.
Preferably, the fiber composite is selected from carbon fiber, glass fiber, basalt fiber or aramid fiber composite.
The application also provides a method for improving the cracking resistance of the prefabricated concrete frame structure, which comprises the following steps:
(1) Slat design and fabrication
Determining the number, length and section size of the battens according to the section size and reinforcement condition of the beams at the joints, and manufacturing the battens;
(2) Channel design and reservation
Determining the size and arrangement scheme of the channels according to the number and the size of the battens, and reserving the channels;
(3) Slat mounting
Firstly roughening the inner wall of the channel, clearing impurities, and then centering the batten into the channel through the structural adhesive.
According to the method for improving the crack resistance of the prefabricated concrete frame structure, in the step (1), the length of the batten and the section size thereof are determined according to the section size and the reinforcement condition of the beam at the joint:
the cross section of the strip is preferably rectangular, the width b thereof f Taking 12-16 mm of total thickness t f When the thickness of a single thin plate strip is not satisfied, a plurality of thin plates can be stuck by using structural adhesive to obtain the thin plate strip with the thickness of 6-8 mmA calculated slat;
the length of the lath extends from the joint to two sides for 10 to 12b respectively f Length.
According to the method for improving the cracking resistance of the prefabricated concrete frame structure, in the step (2), the dimensions of the channel are determined as follows: the length of the channel is the length of the slat; channel depth strip width b f 1.5 times of (2); channel width strip thickness 2t f And (t) f +6mm) larger;
the channel arrangement scheme is as follows: symmetrically and parallelly arranged along the axis of the beam, and taking the distance of 80-100 mm along the height direction of the beam; the distance from the surface of the beam flange is not higher than 1/4 of the height of the beam and not lower than 40mm.
According to the method for improving the cracking resistance of the prefabricated concrete frame structure, in the step (3), the batten is filled into the channel along the depth direction of the channel through structural adhesive in a centering manner.
Compared with the prior art, the application has the following beneficial effects:
1. according to the node for improving the crack resistance of the prefabricated concrete frame structure, aiming at the defect that the crack resistance of the joint part of the prefabricated concrete frame structure is poor, the joint crack resistance is improved by reserving a plurality of channels in the beam section concrete protective layer at the joint part and installing the fiber reinforced composite battens, so that the connection of the prefabricated structures at the two sides of the joint is enhanced;
2. the method adopts a mode of reserving the channel on the concrete protective layer at the joint and installing the fiber reinforced composite batten, can be used for reinforcing various prefabricated assembly type structural joints, has the advantages of wide application range, convenience in construction, high safety, good durability and the like, and has wide application prospect.
Of course, it is not necessary for any one product to practice the application to achieve all of the advantages set forth above at the same time.
Drawings
FIG. 1 is a schematic view of a single fiber reinforced composite web of example 1 of the present application;
FIG. 2 is a schematic view of a plurality of bonded fiber reinforced composite battens according to embodiment 1 of the present application;
FIG. 3 is a schematic view of a rectangular wood strip for grooving according to example 1 of the present application;
FIG. 4 is a front elevation view of the precast concrete frame structure of embodiment 1 of the present application before reinforcement;
FIG. 5 is a schematic cross-sectional view of a beam after reinforcement according to example 1 of the present application;
FIG. 6 is a schematic view showing the overall effect of the reinforced reinforcing material according to embodiment 1 of the present application;
the reference numerals in the figures are as follows:
1-a thin web; 2-fiber reinforced composite panels; 3-wood strips; 4-prefabricating a column; 5-prefabricating a beam; 6-channel; 7-seaming.
Detailed Description
Aiming at the problems in the background technology, the inventor discovers that the reinforcing method based on the fiber reinforced composite material developed in the last 20 years is always a hot research subject in the civil engineering industry by virtue of the advantages of high efficiency, high strength, good durability and the like, and how to apply the reinforcing method to the joint part of the PC frame structure in a rational way, so that the problems of overlarge development of the joint and the like are effectively solved, and the improvement of the cracking resistance of the structure is a key of the application.
According to the application, the connection of the prefabricated structures at the two sides of the joint is enhanced by reserving a plurality of channels in the beam side concrete protective layer near the joint and installing the fiber reinforced composite batten, so that the crack resistance at the joint is improved, the durability of the structure is improved, and the service period of the structure is prolonged. The method is suitable for various beam column joints of the prefabricated concrete frame structure, is convenient to construct, has obvious effect and wide application prospect, and is widely suitable for joints of various concrete structures or components.
The application relates to a method for improving the crack resistance of a prefabricated concrete frame structure, which comprises the following steps of reserving a channel in a beam side concrete protective layer near a joint and installing a fiber reinforced composite board strip:
(1) Slat design and fabrication
Determining the number, length and section size of the battens according to the section size and reinforcement condition of the beams at the joints, and manufacturing the battens;
determining the size of the strip: the cross section of the strip is preferably rectangular, the width b thereof f Taking 12-16 mm of total thickness t f Taking 6-8 mm; the length of the lath extends from the joint to two sides for 10 to 12b respectively f A length; the above-mentioned sizing is applicable to the case where the protective layer of a typical beam, column or the like is between 20-25mm, in which protective layer the channels are provided;
and (3) manufacturing the battens: when the thickness of a single thin plate strip is not satisfied, a plurality of thin plate strips can be stuck by using the structural adhesive to prepare the required thin plate strip, particularly, the thin plate strip with the corresponding length can be cut according to the size of the required thin plate strip, the surface of the thin plate strip is coated with the structural adhesive, and the thin plate strips are stuck mutually to prepare the required thin plate strip. The batten used by the application has high tensile strength, is always in an elastic stage, and can retract automatically after external load is removed;
(2) Channel design and reservation
Determining the size and arrangement scheme of the channels according to the number and the size of the battens, and reserving the channels;
in particular, the method comprises the steps of,
determining a channel arrangement: the channels are symmetrically and parallelly arranged along the axis of the beam, and the distance between the channels is 80-100 mm along the height direction of the beam; the distance from the surface of the beam flange is not higher than 1/4 of the height of the beam and not lower than 40mm so as to achieve the ideal reinforcing effect;
determining the size of the channel: the length of the channel is the length of the slat; channel depth strip width b f 1.5 times of (2); channel width strip thickness 2t f And (t) f +6mm) larger;
reserving a channel: and reserving a channel with a specified size at a position corresponding to the prefabricated part according to the design size. The reserved channel can be obtained by placing a mould (such as a square) with a corresponding size when concrete is poured, and taking out the mould after the concrete is initially set;
(3) Slat mounting
Firstly roughening the inner wall of a channel, clearing away impurities such as floating ash and the like, and then centering the batten into the channel through structural adhesive;
in particular, the method comprises the steps of,
mounting preparation: roughening the inner wall of the channel, cleaning up floating ash and the like so as to ensure that the concrete is fully meshed with the colloid;
and (3) installing the battens: firstly, 2/3 volume of the required structural colloid is injected into the groove, and then the width of the batten is inserted into the groove along the depth direction of the groove in a centering way. And injecting the residual structural adhesive to fill the whole channel, and finally wiping the residual adhesive by using a spatula.
The application will be further illustrated with reference to specific examples. It should be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. Modifications and adaptations of the application will occur to those skilled in the art and are intended to be within the scope of the application in practice. The components not explicitly described in this embodiment can be implemented by using the prior art.
Example 1
In the embodiment, taking a node in a certain side frame as an example, the cross section size of a prefabricated column 4 is 600 multiplied by 600mm, the cross section size of a prefabricated beam 5 is 250 multiplied by 400mm (the height of a web plate is 380 mm), the prefabricated column 4 and the prefabricated beam 5 are spliced at the position of a joint 7, and the problem of insufficient potential crack resistance exists at the joint.
As shown in fig. 1-2, 3 thin webs 1 (with the width of 16mm and the thickness of 2 mm) are stuck together according to the condition of the joint to be reinforced to obtain a fiber reinforced composite board strip 2, wherein the cross section of the board strip 2 is 16mm wide, 6mm thick and 320mm long (the setting positions are 160mm extending from two sides of the joint). Six battens 2 are counted, three battens are arranged on each side of the web of the beam section, the middle batten is arranged along the axis of the beam 5, and the battens at the two ends are arranged along the direction parallel to the axis of the beam 5; the centers of the two end battens are 100mm away from the surface of the beam flange, the center distance of each batten is 100mm, and the centers of the battens are coincident with the center of the joint 7.
As shown in fig. 3-4, the reserved channel 6 is manufactured on the premise of determining the installation position of the batten, and the batten 3 is 320mm long, 12mm wide and 24mm deep. And taking out the batten 3 when the concrete is initially set, so as to obtain the channel with the required size.
As shown in fig. 5-6, when in field installation, firstly, a chisel is used for roughening the inner wall of the channel 6, and an air pump is used for cleaning out slag floating ash in the channel; then 2/3 volume of structural adhesive is injected into the channel 6, and the width of the batten 2 is inserted into the channel 6 along the depth direction of the channel 6 in the middle; and (3) refilling the structural adhesive to fill the channel 6, fully wrapping the batten, and finally wiping off the superfluous adhesive on the surface of the beam by using a spatula.
Fig. 6 is a schematic diagram of the overall effect of the reinforced nodes in the side frame of embodiment 1.
According to the application and the embodiment, the plurality of channels are reserved in the beam section concrete protective layer at the joint and the fiber reinforced composite batten is arranged, so that the connection of prefabricated structures at two sides of the joint is enhanced, and the crack resistance of the joint is improved.
The preferred embodiments of the application disclosed above are intended only to assist in the explanation of the application. The preferred embodiments are not exhaustive or to limit the application to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the application and the practical application, to thereby enable others skilled in the art to best understand and utilize the application. The application is limited only by the claims and the full scope and equivalents thereof.
Claims (5)
1. The method for improving the cracking resistance of the prefabricated concrete frame structure is applied to the joint part of the PC frame structure and is characterized in that firstly, the lath design is carried out according to the section size and reinforcement condition of beams at the joint, the number, the length and the section size of the laths are determined, the lath manufacture is carried out, in the processing process of prefabricated components, the size and the arrangement scheme of the channel are determined according to the number and the size of the laths, a plurality of channels are reserved in a beam side concrete protection layer near the joint, then the concrete frame node assembly is completed by utilizing the existing assembly method and technology, and finally the lath is installed in the channels by utilizing structural adhesive; wherein,
the cross section of the batten is rectangular, and the width of the batten isb f Taking 12-16 mm of total thicknesst f Taking 6-8 mm of the battenThe length of the seam is 10 to 12 respectively extending from the seam to two sidesb f A length;
the channels are symmetrically and parallelly arranged along the axis of the beam, 80-100 mm is taken along the height direction interval of the beam, the distance from the surface of the flange of the beam is not higher than 1/4 of the height of the beam and not lower than 40mm, and the size of the channels is determined as follows: the length of the channel is the length of the slat; channel depth strip widthb f 1.5 times of (2); channel width strip thickness 2t f And%t f +6mm) larger.
2. The method of claim 1, wherein the strips are arranged with their width along the depth of the channel and centrally installed in the channel by means of a structural adhesive.
3. A node for improving crack resistance of a prefabricated concrete frame structure, characterized in that it is manufactured by the method of any one of claims 1-2, comprising a concrete frame node completed by the existing assembly method and technique, and a plurality of channels reserved in a beam-side concrete protection layer near the joints of said node, and a fiber-reinforced composite slab installed in said channels by structural glue.
4. A node for improving crack resistance of a prefabricated concrete frame structure as recited in claim 3, wherein said plurality of channels are provided in each of said beam side concrete cover layers, and wherein said plurality of corresponding said plurality of strips are provided.
5. A node for enhancing crack resistance of a prefabricated concrete frame structure as claimed in claim 3, wherein said panel is a single panel or a unitary body made of a plurality of panels glued together by structural glue.
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| CN201910103981.5A CN109610877B (en) | 2019-02-01 | 2019-02-01 | Node and method for improving crack resistance of prefabricated concrete frame structure |
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| CN111101628B (en) * | 2020-01-02 | 2021-04-20 | 中国矿业大学 | FRP sheet material connecting structure and method for precast concrete beam plate system |
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| CN101240662A (en) * | 2008-03-13 | 2008-08-13 | 山东省建筑科学研究院 | Inner binding outer cramping method architecture structural crack comprehensive processing method |
| CN103195170A (en) * | 2013-04-03 | 2013-07-10 | 中铁建设集团有限公司 | Prefabricated reinforced concrete frame structure system |
| CN104499568A (en) * | 2014-12-19 | 2015-04-08 | 东南大学 | Square steel pipe fabricated column-prefabricated superposed beam integrally-fabricated frame and construction method |
| CN105649202A (en) * | 2016-01-11 | 2016-06-08 | 安徽理工大学 | Prestress fabricated frame joint structure and construction method thereof |
| CN209780313U (en) * | 2019-02-01 | 2019-12-13 | 上海应用技术大学 | Node for improving crack resistance of prefabricated concrete frame structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060112874A (en) * | 2005-04-28 | 2006-11-02 | 주식회사 인터컨스텍 | Methods for connection of spliced prestressed concrete girder segments |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101240662A (en) * | 2008-03-13 | 2008-08-13 | 山东省建筑科学研究院 | Inner binding outer cramping method architecture structural crack comprehensive processing method |
| CN103195170A (en) * | 2013-04-03 | 2013-07-10 | 中铁建设集团有限公司 | Prefabricated reinforced concrete frame structure system |
| CN104499568A (en) * | 2014-12-19 | 2015-04-08 | 东南大学 | Square steel pipe fabricated column-prefabricated superposed beam integrally-fabricated frame and construction method |
| CN105649202A (en) * | 2016-01-11 | 2016-06-08 | 安徽理工大学 | Prestress fabricated frame joint structure and construction method thereof |
| CN209780313U (en) * | 2019-02-01 | 2019-12-13 | 上海应用技术大学 | Node for improving crack resistance of prefabricated concrete frame structure |
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