CN105926961B - Prestressed steel plate hoop reinforces rectangular section concrete column method - Google Patents
Prestressed steel plate hoop reinforces rectangular section concrete column method Download PDFInfo
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- CN105926961B CN105926961B CN201610272199.2A CN201610272199A CN105926961B CN 105926961 B CN105926961 B CN 105926961B CN 201610272199 A CN201610272199 A CN 201610272199A CN 105926961 B CN105926961 B CN 105926961B
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- 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
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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Abstract
The invention discloses a kind of prestressed steel plate hoops to reinforce rectangular section concrete column method, it is characterized mainly in that: steel plate hoop is installed on concrete column, lateral spread is carried out to steel plate hoop using expansion tool, installation pre-tightens strip, strip will be pre-tightened after withdrawing from expansion tool and steel plate hoop carries out spot welding connection, realize reinforcing of the prestressed steel plate hoop to rectangular section concrete column.Reinforcement means of the invention obtains effective active constraint effect in rectangular column corner and four sides, substantially homogeneous hoop constraint effect can be formed, concrete is set to be in three dimension stress state, to more efficiently improve the performances such as concrete column bearing capacity, ductility, it is suitble to the strengthening construction of the rectangular section concrete column for axial compression or small eccentric pressure.
Description
Technical field
The present invention relates to a kind of prestressed steel plate hoops to reinforce rectangular section concrete column method, belongs to building structure strengthening skill
Art field.
Background technique
The rectangular section concrete column of ductility is unsatisfactory for requiring or needed to improve for bearing capacity, and common reinforcement means has
The reinforcement means such as increasing section method for strengthening, the carbon cloth reinforced method of outsourcing, encased steel plate hoop, outsourcing fashioned iron.Wherein, encased steel plate
Hoop method for strengthening be in Practical Project through frequently with a kind of reinforcement means, this method have many advantages, such as draw materials it is convenient, easy for construction.
For rectangular section concrete column, when former column concrete stress levels are higher, there is one for common encased steel plate hoop reinforcement means
Determine disadvantage, shows the steel plate materials of former concrete material and reinforcing there is Stress resort effect, i.e. concrete column is pressurized
After generating transversely deforming, steel plate hoop just starts stress and confined concrete, but steel plate hoop stress is possible to always in low-level
State cannot give full play to the effect of confined concrete, and predetermined reinforcing purpose is not achieved.
The effective ways for solving Stress resort effect, raising steel plate hoop utilization rate and consolidation effect are used to concrete column
Transverse prestress technology, i.e., by applying circumferential pretension to reinforcing steel plate hoop used, so that steel plate hoop is in preparatory tension
State reduces Stress resort effect so that concrete column be made to obtain active lateral restraining force.Existing steel plate hoop reinforces rectangular section
In concrete column technology, a kind of method is so that encased steel plate is obtained certain prestressing force using pressure injecting glue, but glue injection method is obtained
The active constraint power obtained is very small；Another method prepared screw-bolt hole at the corresponding steel plate hoop of concrete column corner positions leads to
It crosses the method for tightening oblique bolt and transverse prestress is applied to column concrete, or first will consolidate reinforcing component before steel plate hoop installation
It is scheduled on steel plate hoop, prestressing force is applied using the applying mode for screwing high-strength bolt, is welded at hoop plate docking using steel plate；This
Outside, then can also restore to apply prestressing force to steel plate hoop to the mode of room temperature again by increasing steel plate hoop temperature.
Rectangular section concrete column, under existing prestressed reinforcement mode, steel plate hoop are reinforced for prestressing force encased steel plate hoop
On four side of column, there are flat segments, although the stress level of steel plate hoop is higher, steel plate hoop mainly concentrates the constraint of concrete column
In rectangular column corner, steel plate hoop flat segments and column concrete are constrained without effectively interaction, and steel plate hoop flat segments are to coagulation
The constraint of soil is passive type constraint, i.e., concrete has already appeared cracking and obvious transversely deforming, steel plate flat segments are bent
While, steel plate reacts on the transversely deforming of concrete, it is clear that binding effect is unsatisfactory.
Summary of the invention
The technical problems to be solved by the present invention are: providing a kind of prestressed steel plate hoop reinforcing rectangular section concrete column side
Method is not only able to generate operative constraint to column corner, and can effectively constrain the concrete on four side of column, preferably plays pre-
Consolidation effect of the stress steel plate hoop to rectangular concrete column.
The present invention proposes that a kind of prestressed steel plate hoop reinforces rectangular section concrete column method, which is characterized in that in coagulation
Steel plate hoop 3 is installed on earth pillar 1, lateral spread is carried out to steel plate hoop 3 using expansion tool 5, installation pre-tightens strip 6, withdraws from expansion
Strip 6 will be pre-tightened after tool 5 and steel plate hoop 3 carries out spot welding connection, realize reinforcing of the prestressed steel plate hoop to concrete column.
Prestressed steel plate hoop of the invention reinforces rectangular section concrete column method, and specific step is as follows:
Step 1, load situation, concrete column sectional dimension, arrangement of reinforcement and the strength of materials parameter undertaken according to concrete column,
Calculate the load action effect γ of concrete column under vertical uniform load q0S, compressive load-carrying capacity of normal cross section N, wherein γ0For structure
Important coefficient, S are load action effect design value；
Step 2, the Design of Reinforcement that prestressed steel plate hoop reinforces rectangular section concrete column is carried out, is tentatively drafted used in reinforcing
Steel plate hoop sectional dimension, steel plate hoop spacing, the steel plate hoop strength of materials, calculate the volume distributed ratio ρ of steel plate hoopsv, calculate and answer in advance
The equivalent axial compressive strength design value of concrete after the reinforcing of power steel plate hoop flFor restraint stress, fcTo reinforce preceding concrete axial compressive strength design
Value, fspFor steel plate hoop tensile stress, wherein according to selected steel plate hoop design value for strength of material, determine steel plate hoop tensile stress fsp；
Step 3, the concrete column capacity under axial N after calculated prestressing force steel plate hoop is reinforceds, For the coefficient of stability of reinforced concrete member, A is concrete column area of section, fy'、As' be
Compressive reinforcement compression strength design value and area；
Step 4, compare NsAnd the load action effect γ that step 1 calculates0S, the steel plate hoop section ruler that set-up procedure 2 is drafted
Very little, steel plate hoop spacing, steel plate hoop material and steel plate hoop tensile stress recalculate N according to step 2, step 3s, so that Ns≥γ0S；
Step 5, preload strip position and the quantity of four side steel plate hoop of concrete column, the preload strip quantity on each side are determined
It is 2, pre-tightens strip and be arranged near the three branch positions on column side；Determine steel plate hoop in the elemental height h1 on four side of column and initial
Shape, h1 take column side length
Step 6, according to the steel plate hoop tensile stress f of step 4sp, primarily determine the unilateral amount of expansion h2 of steel plate hoop, calculate unilateral
The elongation Δ L of steel plate hoop calculates steel plate hoop strainL1For unilateral steel plate hoop original shape length, steel plate hoop is calculated
Stress σ=E ε compares fspWith σ, the unilateral amount of expansion h2 of steel plate hoop is adjusted repeatedly, so that fspExist with both σ numerical differencesfspWith
It is interior, the final unilateral amount of expansion h2 for determining steel plate hoop；
Step 7,1 surface of concrete column and corner grinding process, column corner install corner protector steel plate 2, then install steel plate hoop
3, support member 4；
Step 8, lateral spread is carried out to steel plate hoop 3 using expansion tool 5, realizes the tensioning of steel plate hoop 3, measurement, which proposes, sets
The lateral spread amount for pre-tightening strip position stops expansion when amount of expansion reaches h2, and installation preload strip 6 is simultaneously interim solid by it
It is scheduled on 1 surface of concrete column；
Step 9, expansion tool 5 is unloaded and withdrawn from, strip 6 will be pre-tightened and steel plate hoop 3 carries out spot welding connection；
Step 10, by the gap infusion and binding material between steel plate hoop 3 and concrete column 1, steel plate member and concrete table
Protective layer is smeared in face, completes the prestressed steel plate hoop strengthening construction of rectangular section concrete column.
Further, the preload strip quantity on four sides of rectangular concrete column can be 1, when being arranged 1, pre-tighten card
Item is arranged near the midpoint on column side, and calculation method and calculating process are essentially identical.
Further, pre-tightening strip can be connect with steel plate hoop using spot welding mode, and bolt mode can also be used and connect.Steel
The binding material being perfused between plate hoop and concrete column can be high-strength grout, cement mortar etc..
Compared with existing steel plate hoop reinforces rectangular concrete column and prestressed steel plate hoop reinforces Rectangular Concrete column technology, this
The novelty and beneficial effect of invention are:
(1) steel plate hoop prestressing force mechanism of production is different.For rectangular section concrete column, the present invention is by steel plate hoop by tradition
Rectangular shape changes into polygonal shape, obtains prestressing force using the method for lateral spread steel plate hoop, is different from existing direct drawing
It stretches steel plate hoop method and obtains prestressing force, obtain prestressing force also different from heating cool-down method.
(2) steel plate hoop constraint range is different.Existing prestressed steel plate hoop reinforces rectangular concrete column in four Bian Jun of column
There are steel plate hoop flat segments, constraint is focusing only on the four corners of column, and the steel plate hoop on four side of column does not have with column concrete
Effective interaction constraint, reinforcement means of the invention obtain effective active constraint in rectangular column corner and four sides and make
With generating substantially homogeneous hoop constraint effect, so that concrete is in three dimension stress state, to more efficiently improve coagulation
The performances such as earth pillar bearing capacity, ductility preferably limit and have delayed concrete column cracking, and give full play to the pull resistance of steel plate hoop
Energy.
Detailed description of the invention
Fig. 1 is that prestressed steel plate hoop of the invention reinforces rectangular section concrete column method broad flow diagram；
Fig. 2 is that prestressed steel plate hoop of the invention reinforces rectangular section concrete column work progress schematic diagram；
Fig. 3 is that prestressed steel plate hoop of the invention reinforces the signal of rectangular section concrete column plane.
Appended drawing reference: 1- concrete column, 2- corner protector steel plate, 3- steel plate hoop, 4- support member, 5- expansion tool, 6- pre-tighten strip
Specific embodiment
The present invention provides a kind of prestressed steel plate hoops to reinforce rectangular section concrete column method, below by Detailed description of the invention
The present invention will be further described with specific embodiment.
Fig. 1 shows the main flow that prestressed steel plate hoop of the invention reinforces rectangular section concrete column method.
Fig. 2, Fig. 3 show the specific reality that prestressed steel plate hoop of the invention reinforces rectangular section concrete column method
Apply example.
Concrete column sectional dimension l × b=600 × 600mm, strength grade of concrete C25, axial compressive strength design value
fc=11.9N/mm2, shaft pressuring load design value 6000kN, indulging muscle arrangement of reinforcement is 12φ20, bar material strength failure criterion f 'y=
300N/mm2, concrete column security level second level, component stability coefficient 1.0.
Step 1, the ginseng such as load situation, concrete column sectional dimension, arrangement of reinforcement and strength of materials undertaken according to concrete column
Number calculates the load action effect γ of concrete column under vertical uniform load q0S, concrete column bearing capacity.Concrete column safety etc.
Grade second level, load action effect γ0S=6000kN, compressive load-carrying capacity of normal cross section N=4873kN, bearing capacity are less than load action
Effect is reinforced.
Step 2, the Design of Reinforcement that prestressed steel plate hoop reinforces rectangular section concrete column is carried out, is tentatively drafted used in reinforcing
100 × 4mm of steel plate hoop sectional dimension, steel plate hoop area As=400mm2, steel plate hoop distance s=100mm, steel plate hoop material
Q235b, when Design of Reinforcement, take steel plate hoop tensile stress fsp=150N/mm2, steel plate hoop elastic modulus E=2.01 × 105N/mm2；Meter
The volume distributed ratio for calculating steel plate hoop takes to simplify the calculationIt is mixed after the reinforcing of calculated prestressing force steel plate hoop
The solidifying equivalent axial compressive strength design value of soilRestraint stressEquivalent axle center pressure resistance
Spend design value
Step 3, the concrete column capacity under axial N after calculated prestressing force steel plate hoop is reinforceds,
Step 4, compare NsAnd the load action effect γ that step 1 calculates0S, Ns=9627.1kN > γ0S=6000kN is full
Foot, which calculates, to be required, and steel plate hoop sectional dimension, material model for drafting etc. meet the requirements, do not need to adjust.If NsStill less than load
Action effect then suitably increases the steel plate hoop sectional dimension that step 2 is drafted, reduces steel plate hoop spacing, or improve steel plate hoop material
Expect intensity and steel plate hoop tensile stress, N is recalculated according to step 2, step 3s, so that Ns≥γ0S。
Step 5, preload strip position and the quantity of four side steel plate hoop of concrete column, the preload strip quantity on each side are determined
It is 2, pre-tightens strip and be arranged near the three branch positions on column side；Determine that steel plate hoop takes in the elemental height h1 on four side of column, h1
Column side lengthThe present embodiment takesH1=30mm determines the original shape of steel plate hoop, sees attached drawing 2 (a).
Step 6, according to the steel plate hoop tensile stress f of step 4sp=150N/mm2, primarily determine the unilateral amount of expansion of steel plate hoop
H2=1.5mm calculates elongation Δ L=2 × (202.4654-202.2375)=0.4558mm of unilateral steel plate hoop, calculates steel
The strain of plate hoopL1For unilateral steel plate hoop original shape length；Calculating steel plate hoop stress σ=E ε=
151.6N/mm2, close to design steel plate hoop tensile stress fsp=150N/mm2, fspExist with both σ numerical differencesfspWithin, amount of expansion
H1=1.5mm value is reasonable.Differ larger with steel plate hoop tensile stress is designed if calculating steel plate hoop stress, by adjusting h2,
Adjustable h1, or h1, h2 are adjusted simultaneously, steel plate hoop stress is recalculated, is allowed to approach design steel plate hoop tensile stress.
Step 7,1 surface of concrete column and corner grinding process, column corner install corner protector steel plate 2, then install steel plate hoop
3, Fig. 2 (a) is seen in support member 4.
Step 8, lateral spread is carried out to the steel plate hoop on four side of column using stretching pliers or other expansion tools 5, realizes steel plate
The tensioning of hoop, measurement proposes the lateral spread amount set and pre-tighten strip position, when unilateral amount of expansion reaches h2=1.5mm, stops
Expansion, installation pre-tighten strip and are temporarily fixed at concrete column surface, see Fig. 2 (b), Fig. 2 (c).
Step 9, expansion tool 5 is unloaded and withdrawn from, strip will be pre-tightened and steel plate hoop carries out spot welding connection, see Fig. 2 (d).
Step 10, M10 cement mortar, steel plate member and concrete is perfused in the gap between steel plate hoop 3 and concrete column 1
Protective layer is smeared on surface, is completed prestressed steel plate hoop and is reinforced the construction of rectangular section concrete column, sees Fig. 3.
Compared with existing prestressed steel plate hoop reinforces rectangular section concrete column technology, existing prestressed steel plate hoop reinforces square
There are steel plate hoop flat segments on four side of column in shape concrete column, constraint is focusing only on the four corners of column, and four side of column
Steel plate hoop and column concrete are constrained without effectively interaction, and reinforcement means of the invention obtains in rectangular column corner and four sides
Effective active constraint effect is obtained, substantially homogeneous hoop constraint effect is generated, concrete is made to be in three dimension stress state, thus
The performances such as concrete column bearing capacity, ductility are more efficiently improved, preferably limit and delayed concrete column cracking, and sufficiently
Play the tensile property of steel plate hoop.
In the present embodiment, when reinforcing 600 × 600mm concrete column using conventional steel plates hoop or prestressed steel plate hoop, column
There are flat segments for four side steel plate hoops, and by taking the one third point position transversely deforming on four side of column as an example, the position is because of concrete transverse direction
When deformation increases 1.5mm by 0, steel plate tensile stress only increases 3.75N/mm2, stress incrementss very little, so being easy to by coagulation
Native lateral compression bent, it is difficult to play effect of contraction；And work as steel plate hoop and there is elemental height h1=30mm in the position, the position
When increasing 1.5mm because of concrete transversely deforming, steel plate tensile stress increases 151.6N/mm2, stress incrementss are very big, effectively send out
The effect of contraction of steel plate hoop has been waved, reinforcement material utilization rate is improved.As steel plate hoop is in the initial action value (i.e. h1) in four side of column
Increase, steel plate stress increment caused by same action increase (i.e. h2) is bigger, and the radial constraint efficiency of steel plate is higher, reinforces
Effect is better.
The present invention is described in detail above by embodiment, the above embodiments are only used to help understand
Method and its core concept of the invention；At the same time, for those skilled in the art is having according to the thought of the present invention
There will be changes in body embodiment, reinforcement material used and application range, in conclusion the content of the present specification should not manage
Solution is limitation of the present invention.
Claims (2)
1. a kind of prestressed steel plate hoop reinforces rectangular section concrete column method, which is characterized in that installed on concrete column (1)
Steel plate hoop (3) carries out lateral spread to steel plate hoop (3) using expansion tool (5), and installation pre-tightens strip (6), withdraws from expansion tool
(5) strip (6) and steel plate hoop (3) will be pre-tightened after and carry out spot welding connection, realize reinforcing of the prestressed steel plate hoop to concrete column.
2. a kind of prestressed steel plate hoop according to claim 1 reinforces rectangular section concrete column method, which is characterized in that
The following steps are included:
Step 1, load situation, concrete column sectional dimension, arrangement of reinforcement and the strength of materials parameter undertaken according to concrete column calculates
The load action effect of concrete column, compressive load-carrying capacity of normal cross section N under vertical uniform load q；
Step 2, the Design of Reinforcement that prestressed steel plate hoop reinforces rectangular section concrete column is carried out, tentatively drafts and reinforces steel used
Plate hoop sectional dimension, steel plate hoop spacing, the steel plate hoop strength of materials calculate the volume distributed ratio ρ of steel plate hoopsv, calculated prestressing force steel
The equivalent axial compressive strength design value of concrete after the reinforcing of plate hoop fl
For restraint stress, fcTo reinforce preceding concrete axial compressive strength design value, fspFor steel plate hoop tensile stress, wherein according to selected
Steel plate hoop design value for strength of material determines steel plate hoop tensile stress fsp；
Step 3, the concrete column capacity under axial N after calculated prestressing force steel plate hoop is reinforceds,
For the coefficient of stability of reinforced concrete member, A is concrete column area of section, f 'y、A′sFor compressive reinforcement compression strength design value
And area；
Step 4, compare NsAnd the load action effect that step 1 calculates, steel plate hoop sectional dimension that set-up procedure 2 is drafted, steel plate hoop
Spacing, steel plate hoop material and steel plate hoop tensile stress recalculate N according to step 2, step 3s, so that NsMake more than or equal to load
Use effect；
Step 5, determine that preload strip position and the quantity of four side steel plate hoop of concrete column, the preload strip quantity on each side are 2
It is a, it pre-tightens strip and is arranged near the three branch positions on column side；Determine elemental height h1 and initial shape of the steel plate hoop on four side of column
Shape, h1 take column side length
Step 6, according to the steel plate hoop tensile stress f of step 4sp, primarily determine the unilateral amount of expansion h2 of steel plate hoop, calculate unilateral steel plate
The elongation Δ L of hoop calculates steel plate hoop strainL1For unilateral steel plate hoop original shape length, steel plate hoop stress σ is calculated
=E ε compares fspWith σ, the unilateral amount of expansion h2 of steel plate hoop is adjusted repeatedly, so that fspExist with both σ numerical differencesWithin, most
The unilateral amount of expansion h2 of steel plate hoop is determined eventually；
Step 7, concrete column (1) surface and corner grinding process, column corner install corner protector steel plate (2), then install steel plate hoop
(3), support member (4)；
Step 8, lateral spread is carried out to steel plate hoop (3) using expansion tool (5), realizes that the tensioning of steel plate hoop (3), measurement propose
The lateral spread amount for pre-tightening strip position is set, when amount of expansion reaches h2, stops expansion, installation pre-tightens strip (6) and faced
When be fixed on concrete column (1) surface；
Step 9, it unloads and withdraws from expansion tool (5), strip (6) and steel plate hoop (3) will be pre-tightened and carry out spot welding connection；
Step 10, by the gap infusion and binding material between steel plate hoop (3) and concrete column (1), steel plate member and concrete table
Protective layer is smeared in face, completes the prestressed steel plate hoop strengthening construction of rectangular section concrete column.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109779281A (en) * | 2019-01-31 | 2019-05-21 | 广西大学 | A method of with prestressing force hose clamp reinforced steel concrete structure |
| CN110424763B (en) * | 2019-08-06 | 2021-07-13 | 北京市安泰运源建筑工程有限公司 | Steel-clad structure of stand column and using method thereof |
| CN111444562B (en) * | 2020-03-13 | 2023-01-24 | 武汉理工大学 | Method for determining bearing capacity of light ultra-high performance concrete column under compression in axis |
| CN113216677B (en) * | 2021-04-08 | 2023-02-10 | 河南征信建筑工程有限公司 | Simple high-strength structural column reinforcing mechanism and method |
| CN113756600A (en) * | 2021-09-01 | 2021-12-07 | 福建省建研工程顾问有限公司 | Reinforcing method for improving axial compression performance of concrete column and structure thereof |
| CN114737783B (en) * | 2022-04-20 | 2023-03-03 | 武汉大学 | Method and equipment for reinforcing concrete column by adopting sandwich structure |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5444952A (en) * | 1994-12-12 | 1995-08-29 | Jackson; Paul R. | Chimney reinforcing device |
| CN202431015U (en) * | 2011-12-20 | 2012-09-12 | 陕西省建筑科学研究院 | Masonry wall reinforcing device for building |
| JP2016014312A (en) * | 2014-06-10 | 2016-01-28 | 株式会社熊谷組 | Deformation control method and belt-like fastening member for reinforcing steel plate used on reinforced concrete column |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108089064B (en) * | 2016-11-21 | 2020-04-28 | 中国科学院大连化学物理研究所 | Device and method for measuring pulse width of pulse ion beam |
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- 2016-04-27 CN CN201610272199.2A patent/CN105926961B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5444952A (en) * | 1994-12-12 | 1995-08-29 | Jackson; Paul R. | Chimney reinforcing device |
| CN202431015U (en) * | 2011-12-20 | 2012-09-12 | 陕西省建筑科学研究院 | Masonry wall reinforcing device for building |
| JP2016014312A (en) * | 2014-06-10 | 2016-01-28 | 株式会社熊谷組 | Deformation control method and belt-like fastening member for reinforcing steel plate used on reinforced concrete column |
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