CN102979319A - Method for reinforcing frame node - Google Patents

Method for reinforcing frame node Download PDF

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Publication number
CN102979319A
CN102979319A CN2012105799435A CN201210579943A CN102979319A CN 102979319 A CN102979319 A CN 102979319A CN 2012105799435 A CN2012105799435 A CN 2012105799435A CN 201210579943 A CN201210579943 A CN 201210579943A CN 102979319 A CN102979319 A CN 102979319A
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China
Prior art keywords
strength bolt
frame
carbon fibre
angle steel
fibre sheet
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CN2012105799435A
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Chinese (zh)
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CN102979319B (en
Inventor
王罡
常正非
王新泉
方五军
杨永友
邓初晴
杨志银
Original Assignee
中冶建筑研究总院有限公司
中国京冶工程技术有限公司
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Priority to CN201210579943.5A priority Critical patent/CN102979319B/en
Publication of CN102979319A publication Critical patent/CN102979319A/en
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Abstract

The invention discloses a method for reinforcing a frame node in the field of structure reinforcement. The method comprises the following steps: (1) bonding a carbon fiber sheet at the angle part of the frame node; and (2) through a high-strength bolt, fixing an angle iron at the angle part of the frame node bonded with the carbon fiber sheet. According to the invention, through a stress system and a restriction system formed by the angle iron, the high-strength bolt and the carbon fiber, the frame node is reinforced, in particular, the bearing capacity of the damaged frame node is rapidly recovered; meanwhile, secondary damage of reinforcing construction to the existing structure is avoided, and obvious social benefits and economic benefits are obtained.

Description

A kind of method of stiffening frame node
Technical field
The present invention relates to the technical method of a kind of angle steel, high-strength bolt and carbon fibre composite consolidation frame joint in the structural strengthening field.
Background technology
Frame joint is frame structure system center trestle, the beam superimposed position that crosses, it is the important force part in the whole frame system, also be stressed very complicated position simultaneously, bearing biaxial bending and horizontal shear that the frame column beam passes over, is that emphasis is strengthened the position at structure design, Structural strengthening design especially anti-seismic reinforcement design middle frame node.
China's " Code for design of concrete structures " (GB50010-2010) in 11.6 the design formulas about the frame joint bearing capacity as follows:
1. frame joint Cross section calculation formula:
V j ≤ 1 γ RE ( 0.3 η j β c f c b j h j ) - - - ( 1 )
2. frame joint level shear capacity design formulas
V j ≤ 1 γ RE ( 1.1 η j f t b j h j + 0.05 η j N b j b c + f yv A svj h bo - a s s ) - - - ( 2 )
Steel clad reinforcement is mainly adopted in reinforcing to frame joint at present in the structural strengthening field, the stickup carbon fibre is reinforced, three kinds of methods such as steel concrete enlarging section reinforcing, there is the secondary loading problem between above-mentioned reinforcement means reinforcement material and the original frame joint, namely only have the former frame joint of working as to bear larger internal force, even when the crack occurring, reinforcement material can play a role, share part internal force, so that consolidation effect is had a greatly reduced quality, can't have influence on ultimate bearing capacity of joints, this point can reflect from the definition of each parameter of formula (1) (2), and China's " concrete structure reinforcement design specifications " (GB50010-2010) does not mention above-mentioned reinforcement means to the impact of frame joint bearing capacity yet at present.In addition because frame joint is in frame column, the beam overlapping region that crosses, reinforcement material is difficult to pass smoothly and thoroughly, twines or wraps up frame joint, tend to by perforation, cutting even welded reinforcement mode stiffening frame node, not only weaken the effect of stiffening frame node, also can cause secondary damage to frame joint.
Summary of the invention
For said structure field of reinforcement frame joint reinforcement means defective, the invention discloses a kind of method of stiffening frame node.Described method comprises the steps:
Step 1, the carbon fibre sheet is pasted on the frame joint bight;
Step 2, angle steel is fixed on the frame joint bight of posting the carbon fibre sheet by high-strength bolt.
Further, carry out following steps before the described step 1:
Concrete surface in step a, 3 times of deck-molding scopes with 3 times of depth of beam scopes at Vierendeel girder top, Vierendeel girder bottom, frame column column cap 1/4 post clear height scope, the frame column suspension column 1/4 post clear height scope polishes flat;
Step b, employing patching material are repaired the concrete surface rejected region;
Step c, to basal plane brushing penetrating fluid and paste bonded adhesives.
Described step 2 was not carried out before described bonded adhesives is stiff.
Described carbon fibre sheet is L-type.
The width of described carbon fibre sheet is identical with the width of Vierendeel girder.
Described high-strength bolt comprises the high-strength bolt body of rod, attaching nut and backing plate.
Described angle steel adopts Q235 or Q345 material shaped steel.
Be used for installing the diameter in hole of described high-strength bolt on the described angle steel than the large 1~2mm of diameter of described high-strength bolt.
Described hole adopts Drilling operation equipment to obtain.
The screwing force that described high-strength bolt is applied is 30%~80% of high-strength bolt design bearing capacity.
The objective of the invention is: by stress system and the constraint system of angle steel, high-strength bolt and carbon fibre formation, improve frame joint, the supporting capacity of especially fast quick-recovery frame joint in damaged condition, avoid simultaneously strengthening construction to the secondary damage of existing structure, can realize structure Rapid-Repair after the calamity, have significant Social benefit and economic benefit.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or scheme of the prior art, the below will do one to the accompanying drawing of required use among the embodiment and introduce simply, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 has provided the pre-applied force of angle steel and high-strength bolt to the schematic diagram of the effect of restraint of frame joint;
Fig. 2 has provided the schematic diagram of the additional stress system of frame joint of high-strength bolt and angle steel formation;
Fig. 3 has provided the schematic diagram of the auxiliary carbon fibre raising of angle steel ultimate bearing capacity of joints;
Fig. 4 has provided and has adopted one embodiment of the invention method to carry out the schematic diagram of axle side of the framework of joint reinforcing;
Fig. 5 has provided and has adopted one embodiment of the invention method to carry out the schematic diagram of positive facade of the framework of joint reinforcing;
Fig. 6 has provided and has adopted one embodiment of the invention method to carry out the schematic diagram of side elevation of the framework of joint reinforcing.
The specific embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is carried out clear, complete description, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills obtain under the prerequisite of not making creative work belongs to the scope of protection of the invention.
One embodiment of the invention provides the method for stiffening frame node, comprising:
At first, adopt L shaped carbon fibre sheet 1 material that the frame joint bight is pasted.
Further, before pasting, can be first the concrete surface in the post clear height scope of the depth of beam scope at three times at Vierendeel girder 5 tops, bottom and frame column 4 column caps, suspension column 1/4th be polished flat, and with supporting patching material the basal plane defects position is repaired, penetrating fluid and bonded adhesives are pasted in basal plane brushing after being disposed, then will be with beam with the carbon fibre sheet attaching of width in the node bight.Above-mentioned carbon fibre sheet material reinforcing construction process must require to carry out according to " reinforcing of carbon fibre sheet material ".
Then, be fixed the installation of angle steel 2 and high-strength bolt 3.Wherein, angle steel is selected Q235 or Q345 material shaped steel, and high-strength bolt is the high-strength split bolt that comprises the high-strength bolt body of rod, attaching nut, backing plate.In advance perforate is used for the bolt installation on angle steel, and the aperture should be the high-strength bolt diameter and adds 1~2mm, and perforate must adopt special Drilling operation equipment to finish, and must not adopt high temperature oxygen rifle cutting pore-forming.Angle steel and high-strength split bolt are installed to be installed and should carry out before the colloid of pasting the carbon fibre sheet material is not yet stiff.
Carry out at last tightening of high-strength bolt.Screwing force can reach 30%~80% of high-strength bolt design bearing capacity.
Particularly, as shown in Figure 1, angle steel and high-strength bolt are realized three-dimensional constraining by pre-applied force to frame joint, the pre-applied force P that high-strength bolt and angle steel form LU, P LDEquivalence is the two-dimentional precharge pressure P of node region L1P LL, P LR, P LL, P LREquivalence is the two-dimentional precharge pressure P of node region L2, for frame joint bearing capacity formula (1) and (2), improved calculating parameter η jAnd axial force N value.Wherein, P LUThe precharge pressure that directly forms at framework beam-ends upper surface (back) for angle steel and high-strength bolt; P LDThe precharge pressure that directly forms at framework beam-ends soffit (at the bottom of the beam) for angle steel and high-strength bolt; P LL, P LR, P LF, P LBBe respectively the precharge pressure that angle steel and high-strength bolt directly form in the surrounding of frame column.
Particularly, as shown in Figure 2, angle steel and high-strength bolt have formed the stress system that bears horizontal shear of sealing, act on the stirrup in the similar frame joint.For two all node bearing capacity formula (1) and (2), improved steel bar stress A SvjNumerical value.
Particularly, as shown in Figure 3, the auxiliary carbon fibre of angle steel has improved the bearing capacity of frame joint, the carbon fibre bight pushed down by angle steel so that fiber is given full play to the high characteristics of self intensity, the Reinforcement that it acts in the similar Vierendeel girder has improved the cross section supporting capacity of near the frame column node, beam.
As described in Fig. 4-6, carry out the schematic diagram of the axle side of the framework of joint reinforcing, positive facade and side elevation for adopting the present embodiment method.
The method of present embodiment increases substantially concrete ultimate deformation and the intensity of frame joint nucleus by utilizing high-strength bolt at the precompression that angle steel produces the frame joint zone to be formed the three-dimensional pressure constraint; Utilize precompression that high-strength bolt produces at angle steel so that angle steel and high-strength bolt participate in the stressed of frame joint, improve the supporting capacity of frame joint; Utilize the anchoring property of the effect of contraction raising carbon fibre of carbon fibre knuckle place angle steel, give full play to the high-intensity characteristics of carbon fibre, improve the supporting capacity of frame joint edge opposing horizontal shear.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, perhaps part technical characterictic wherein is equal to replacement, and these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (10)

1. the method for a stiffening frame node is characterized in that, described method comprises the steps:
Step 1, the carbon fibre sheet is pasted on the frame joint bight;
Step 2, angle steel is fixed on the frame joint bight of posting the carbon fibre sheet by high-strength bolt.
2. method according to claim 1 is characterized in that, carries out following steps before the described step 1:
Concrete surface in step a, 3 times of deck-molding scopes with 3 times of depth of beam scopes at Vierendeel girder top, Vierendeel girder bottom, frame column column cap 1/4 post clear height scope, the frame column suspension column 1/4 post clear height scope polishes flat;
Step b, employing patching material are repaired the concrete surface rejected region;
Step c, to basal plane brushing penetrating fluid and paste bonded adhesives.
3. method according to claim 2 is characterized in that, described step 2 was not carried out before described bonded adhesives is stiff.
4. method according to claim 3 is characterized in that, described carbon fibre sheet is L-type.
5. method according to claim 4 is characterized in that, the width of described carbon fibre sheet is identical with the width of Vierendeel girder.
6. method according to claim 5 is characterized in that, described high-strength bolt comprises the high-strength bolt body of rod, attaching nut and backing plate.
7. method according to claim 6 is characterized in that, described angle steel adopts Q235 or Q345 material shaped steel.
8. method according to claim 7 is characterized in that, is used for installing the diameter in hole of described high-strength bolt on the described angle steel than the large 1~2mm of diameter of described high-strength bolt.
9. method according to claim 8 is characterized in that, described hole adopts Drilling operation equipment to obtain.
10. method according to claim 9 is characterized in that, the screwing force that described high-strength bolt is applied is 30%~80% of high-strength bolt design bearing capacity.
CN201210579943.5A 2012-12-27 2012-12-27 A kind of method of stiffening frame node CN102979319B (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104481164A (en) * 2014-11-24 2015-04-01 沈阳建筑大学 Structural steel reinforcing method and structure of concrete frame node
CN104878948A (en) * 2015-04-07 2015-09-02 淮海工学院 Reinforced concrete frame beam hogging moment region reinforcing method and reinforcing device
CN104912346A (en) * 2015-06-01 2015-09-16 兰州理工大学 Reinforced concrete framework structure node reinforcing device
CN105888091A (en) * 2014-11-27 2016-08-24 王振牛 Technical scheme for earthquake prevention and back maintenance of Yongle Temple mural system
CN106284684A (en) * 2016-10-13 2017-01-04 哈尔滨工业大学 The node of coupling beam local widening and shear wall locally thickening and joint connecting method
CN106382015A (en) * 2016-10-13 2017-02-08 浙江绿城建筑设计有限公司 Anti-seismic overlapping structure used for existing-structure large-span stressed beam reinforcement and construction method
CN107268783A (en) * 2017-06-30 2017-10-20 广东省建筑科学研究院集团股份有限公司 A kind of existing reinforced concrete post and newly-increased reinforced beam node connecting structure
CN108749115A (en) * 2018-05-28 2018-11-06 浙江新峰包装材料有限公司 A kind of carton board cuts platform

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JPH0243467A (en) * 1988-07-30 1990-02-14 Daido Steel Co Ltd Method for reinforcing structure body by winding fiber bundle
JPH09144334A (en) * 1995-11-27 1997-06-03 Ohbayashi Corp Construction method of reinforcing concrete structure
CN101004108A (en) * 2007-01-18 2007-07-25 广州大学 Method for reinforcing space nodes of beam column built from concrete
CN102409764A (en) * 2011-08-15 2012-04-11 长安大学 Reinforced concrete framework variable beam special-shaped node structure and reinforcing method

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Publication number Priority date Publication date Assignee Title
JPH0243467A (en) * 1988-07-30 1990-02-14 Daido Steel Co Ltd Method for reinforcing structure body by winding fiber bundle
JPH09144334A (en) * 1995-11-27 1997-06-03 Ohbayashi Corp Construction method of reinforcing concrete structure
CN101004108A (en) * 2007-01-18 2007-07-25 广州大学 Method for reinforcing space nodes of beam column built from concrete
CN102409764A (en) * 2011-08-15 2012-04-11 长安大学 Reinforced concrete framework variable beam special-shaped node structure and reinforcing method

Non-Patent Citations (1)

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王步等: "碳纤维布加固混凝土框架外节点抗震性能试验研究", 《工业建筑》, vol. 37, no. 3, 20 March 2007 (2007-03-20) *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104481164A (en) * 2014-11-24 2015-04-01 沈阳建筑大学 Structural steel reinforcing method and structure of concrete frame node
CN104481164B (en) * 2014-11-24 2016-06-01 沈阳建筑大学 The section steel reinforcement method of concrete frame node and add fixing structure
CN105888091A (en) * 2014-11-27 2016-08-24 王振牛 Technical scheme for earthquake prevention and back maintenance of Yongle Temple mural system
CN104878948A (en) * 2015-04-07 2015-09-02 淮海工学院 Reinforced concrete frame beam hogging moment region reinforcing method and reinforcing device
CN104912346A (en) * 2015-06-01 2015-09-16 兰州理工大学 Reinforced concrete framework structure node reinforcing device
CN106284684A (en) * 2016-10-13 2017-01-04 哈尔滨工业大学 The node of coupling beam local widening and shear wall locally thickening and joint connecting method
CN106382015A (en) * 2016-10-13 2017-02-08 浙江绿城建筑设计有限公司 Anti-seismic overlapping structure used for existing-structure large-span stressed beam reinforcement and construction method
CN106284684B (en) * 2016-10-13 2018-09-07 哈尔滨工业大学 The node and joint connecting method that coupling beam local widening and shear wall locally thicken
CN106382015B (en) * 2016-10-13 2018-10-26 上海杰地建筑设计有限公司 Construction method for the antidetonation iterative structure that existing structure is reinforced across bearing beam greatly
CN107268783A (en) * 2017-06-30 2017-10-20 广东省建筑科学研究院集团股份有限公司 A kind of existing reinforced concrete post and newly-increased reinforced beam node connecting structure
CN108749115A (en) * 2018-05-28 2018-11-06 浙江新峰包装材料有限公司 A kind of carton board cuts platform

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Free format text: CORRECT: INVENTOR; FROM: WANG GANG CHANG ZHENGFEI WANG XINQUAN FANG WUJUN YANG YONGYOU DENG CHUQING YANG ZHIYIN TO: ZHANG DAOXIU LI RONG FANG WUJUN WANG GANG CHANG ZHENGFEI DENG CHUQING YANG YONGYOU FU XIANQIANG YANG ZHIYIN

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