CN104989119B - A kind of method of employing angle steel reinforced timber structure node - Google Patents
A kind of method of employing angle steel reinforced timber structure node Download PDFInfo
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Abstract
The invention discloses including the step of a kind of method of employing angle steel reinforced timber structure node, the method：Predicate node whether need reinforcement, determine beam and column line stiffness ratio, determine angle steel specification, the length for determining self-tapping screw number, determining angle steel wing plate.The present invention establishes the scientific process using angle steel reinforced knaur point, substantial amounts of investigation and experimental study is have passed through during the determination of the flow process, scientifically prove, determine each parameter of angle steel reinforced process, the reinforcing process of knaur point is standardized and is had the foundation for meeting structure, terms of mechanics, to wooden building aseismicity, the research of aspect such as use to have positive reference value and facilitation；Reinforcement material is easy to get；Reinforcement means is simple and science is closed, and reason is easily grasped by peasant；Construction is more convenient, and in the case of less engineering cost, consolidation effect is more significant；Directly can construct on original structure and can use with other reinforcement means superpositions.
Description
Technical field
The present invention relates to a kind of reinforcement means, specifically a kind of using angle steel reinforced node, to lift node, house entirety
The method of intensity.
Background technology
Timber structure and post and panel structure are distributed more widely in China rural area due to history and economic dispatch reason, especially southwestern, western
Northern highly seismic region, also has substantial amounts of gallows timber load bearing construction.As these are all peasant's self-built housings, anti-seismic construction measure is not
Perfect, especially position of joints is directly connected to straight tenon, and anti-seismic performance is poor.Once generation earthquake intensity is shaken higher,
People's life and property safety will be constituted a serious threat.In Wenchuan earthquake, the severely afflicated area such as river southwest, Chuan Bei, Shan Nan, Gannan
There is the phenomenon such as pull-off tenon and folding tenon in a large amount of timber structure nodes.
Traditional rural area wooden frame structure build process is relatively rough, and many nodes of constructing for convenience are directly connected with straight tenon
And mortise is generally big than tenon, Tenon is caused to load onto rear defective tightness.As the hardness of timber is little, timber itself can be done
Contracting, while rural area timber structure is not generally through anti-corrosion damp-proof treatment, after certain time limit, tenon can corrode.With
These situations upper can all cause the connection defective tightness at tenon and the fourth of the twelve Earthly Branches, and the rigidity at node is relatively low, when house is subject to earthquake, wind-force etc.
During larger external force, node will bear larger stretching, compression, shearing and twisting action, easily cause to pull out tenon, phenomenon out of joint,
Make house that larger lateral displacement to occur, or even cave in.Through Specialty Design, size is unreasonable due to not for Tenon node
And as node is corroded, the bearing capacity of node is relatively low, in the case where larger external force is subject to, node will occur to roll over tenon phenomenon.
The country mainly includes to the method for timber structure joint reinforcing at present：Node is reinforced with dog, carbon cloth
Deng.When being reinforced with dog, its bearing capacity improves compared with before reinforcing.But, dog rigidity is less and dog
Under course under cyclic loading, its Stiffness Deterioration is very fast, destroys also very fast.In general, dog reinforcement measure is relative to reinforcing
Before have certain effect, but this effect also can just display only at the less node of stress of low crack area, to height
At the larger node of intensity area and stress, effect is not apparent.The price of carbon cloth reinforced measure is higher and constructs less square
Just, in rural area using being restricted.
Content of the invention
For above-mentioned problems of the prior art, it is an object of the invention to, there is provided a kind of method, in bean column node
Deformation relatively general goal, is reinforced to node with angle steel, and the bearing capacity for improving node prevents node from folding tenon occur, improves section
Point rigidity, is limited in big external force effect lower room and may produce big sidesway to improve original out of joint and pull out tenon phenomenon, enter
And improve the anti-seismic performance in house.
In order to realize that above-mentioned task, the present invention are employed the following technical solutions：
A kind of method of employing angle steel reinforced timber structure node, the two ends of described angle steel carry wing plate, according to following steps
After rapid determination angle steel specification, it is connected with beam, post by self-tapping screw using the wing plate at angle steel two ends：
Step one, measures the rotational angle of the node that needs reinforcement, and whether predicate node needs reinforcement, and then holds if desired for reinforcing
Row step 2；
Step 2, determines the line stiffness ratio β of beam and column：
When the section of beam/post is circular, Line stiffness i is：
When the rectangular cross-section of beam/post, Line stiffness i is：
In formula 1 and formula 2, Deflection Modulus of Elasticity of the E for beam/post, diameters of the d for the circular cross-section of beam/post, b are beam/post
The width of circular cross-section, height of the h for the circular cross-section of beam/post, length of the l for beam/post；
Parameter alpha1Span be [0.90,0.95], parameter alpha2Span be [0.80,0.95]；
The line stiffness ratio β of beam and column is：
Step 3, determines the specification of angle steel：
Length l of angle steelySpan isL is beam span；
The area of section S of angle steelyNeed to meet following formula 5：
In formula 5, areas of section of the S for beam, depth of section or diameter of the R for beam, line stiffness ratios of the β for beam and column, fyFor
Angle steel compression strength design load, l1For the length of beam, equivalent strengths of the f for timber, it is [4.1,7.2] that value is scope.
Further, described method also includes step 4：
Step 4, determines self-tapping screw number：
Use number n that self-tapping screw is calculated using formula 6：
In formula 6, fvThe shearing strength design load of timber used by beam, areas of section of the S for beam, f1For the anti-of self-tapping screw
Cut strength failure criterion, r1Radius for self-tapping screw；
Further, described method also includes step 5：
Step 5, determines angle steel wing plate length：
Wing plate length l of angle steelcSpan be：
(3n2+1)d0≤lc≤(16n2-8)d0Formula 7
In formula 7, n2For the row of self-tapping screw on wing plate length direction,Round；
n1For the row of the self-tapping screw on wing plate width, n1Meet formula 8：
In formula 8, byFor wing plate width, d0Diameter for self-tapping screw.
Further, when described angle steel specification determines, angle steel also needs to meet：
In formula 9, byFor angle steel width, tyFor angle steel thickness, lyFor angle steel length.
Further, the angle between the wing plate and angle steel at described angle steel two ends is 135 °.
Further, in described step one, the concrete grammar whether predicate node needs reinforcement is：
When the rotational angle of dovetail node is not less than 0.05rad, the node needs reinforcement；
When the rotational angle of straight tenon node is not less than 0.04rad, the node needs reinforcement.
The present invention has following technical characterstic compared with prior art：
1. the present invention establishes the scientific process using angle steel reinforced knaur point, passes through during the determination of the flow process
Substantial amounts of investigation and experimental study, scientifically prove, determine each parameter of angle steel reinforced process, make the reinforcing of knaur point
Process standardization and there is the foundation for meeting structure, terms of mechanics, to wooden building aseismicity, the research of aspect such as use to have
Positive reference value and facilitation；
2. reinforcement material is easy to get；Reinforcement means is simple and science is closed, and reason is easily grasped by peasant；Construction is more convenient,
In the case of less engineering cost, consolidation effect is more significant；Directly on original structure can construct and can add with other
Solid method superposition is used.
Description of the drawings
M- θ curves of the Fig. 1 for timber structure node；
Computation models of the Fig. 2 for timber structure node；
Front view and side view of the Fig. 3 for angle steel；
Schematic view of the mounting position of the Fig. 4 for angle steel；
In Fig. 2 and Fig. 3：1 post, 2 timber structure nodes, 3 angle steel, 4 wing plates, 5 beams.
Specific embodiment
A kind of method of employing angle steel reinforced timber structure node, the angle steel for being adopted in the method are board-type angle steel,
The two ends of angle steel be respectively provided with one for and beam, pillar connection installation wing plate.The specification of angle steel, parameter determination well after,
Wing plate is connected with beam, pillar by self-tapping screw, to reach the purpose of reinforcing joint.Between the wing plate and angle steel at angle steel two ends
Angle be 135 °.Concrete step is as follows：
Step one, measures the rotational angle of the node that needs reinforcement, and whether predicate node needs reinforcement, and then holds if desired for reinforcing
Row step 2；
The connected mode of dovetail and straight tenon is typically adopted at the node of traditional rural area wooden frame structure, therefore this programme
In mainly both structures are studied.
By the moment-rotation relation drawn by dovetail and straight tenon horizontal cyclic loading exteriment, i.e. M- θ curves, they are intended
Find after conjunction which is all sigmoid curve, simply initial stiffness and surrender angle are had any different.In order to apply this curve, which is further simple
Three sections are turned to, as shown in figure 1, respectively elastic stage, yielding stage and the decline stage.
We conclude that when node enters yielding stage from experiment skeleton curve above, the Stiffness Deterioration of node,
Connection stiffness very little.Then when knaur point is in this stage, the rigidity very little of node, resistance capacity to deformation very little.Therefore, we
The object of reinforcing is exactly that node reaches yielding stage or decline stage.And binding tests result and to Shaanxi, Sichuan and Guizhou
Wooden frame structure investigate discovery on the spot：Generally in joint rotation angle, more than or equal to 0.05rad, (unit is the node of dovetail
Radian) when, node enters yielding stage；When straight tenon joint rotation angle is more than or equal to 0.04rad (unit is radian), section
Point enters yielding stage.
Accordingly, it would be desirable to the node that reinforces is：When the corner of dovetail node is more than or equal to 0.05rad, need to reinforce；Straight tenon section
When the corner of point is more than or equal to 0.04rad, need to reinforce.Can certainly be determined using other modes node whether need plus
Gu.
Step 2, determines the line stiffness ratio β of beam and column：
Find through experimental study and investigation, the Line stiffness of beam/post is main and the section of beam/post, length, bending resistance springform
Amount, parameter alpha1And parameter alpha2Relevant, and meet equation below 1.Wherein, section and length can be obtained by field survey, long
Spend for clear length (not including length at node)；Deflection Modulus of Elasticity is different according to timber kind, inquires about Code for design of timber structures
4.2.3 it is available；Parameter alpha1And parameter alpha2Obtained by experiment and investigation, following Tables 1 and 2.
When the section of beam/post is circular, Line stiffness i is：
When the rectangular cross-section of beam/post, Line stiffness i is：
In formula 1 and formula 2, Deflection Modulus of Elasticity of the E for beam/post, diameters of the d for the circular cross-section of beam/post, b are beam/post
The width of circular cross-section, height of the h for the circular cross-section of beam/post, length of the l for beam/post；"/" represents "or", i.e. cutting when beam or post
When face is circular, formula 1 is calculated, and is calculated with formula 2 during rectangle.
Parameter alpha1Span be [0.90,0.95], parameter alpha2Span be [0.80,0.95], more specific
Refer to table 1 below and table 2：
1 column parameter α of table1α2Value table
| House years already spent y | Y ＜ 5 | 5≤y ＜ 20 | 20≤y ＜ 50 | 50≤y |
| α1 | 1 | 0.95 | 0.90 | 0.90 |
| α2 | 1 | 0.95 | 0.90 | 0.80 |
2 beam parameter alpha of table1α2Value table
The Line stiffness of beam and column can be calculated by formula 1 or formula 2, then calculated：
The line stiffness ratio β of beam and column is：
Step 3, determines the specification of angle steel：
It has been investigated that the strength grade of angle steel, length and area of section be main and the line stiffness ratio of beam column, beam length, beam
The equivalent strength of area of section and timber used is relevant, and which meets equation 4 below.The strength grade of angle steel is typically adopted
Q235 levels, the compression strength design load of angle steel is, it is known that beam-column's linear stiffness ratio can be tried to achieve by formula 3, and the length of beam and section face
Product is obtained by field survey, and the equivalent strength of timber is studied by us and obtains (table 3).
Angle steel needs to meet：
Above formula is changed, the area of section S of angle steel is obtainedyNeed the formula 5 for meeting：
In both the above formula, areas of section of the S for beam, R (are cut for the depth of section (during rectangular cross-section) or diameter of beam
When face is circular), line stiffness ratios of the β for beam and column, fyFor angle steel compression strength design load, l1For the length of beam, f is timber
Equivalent strength, it is [4.1,7.2] that value is scope, and more specific can be found in table 3：
3 timber equivalent strength f (N/mm of table2)
Thus, as long as length l of the angle steel for determiningy(not including the length of tab portions), you can be met according to formula 5
Minimum cross-sectional area S of the angle steel of requirementy.
Find through research, under normal conditions, length l of angle steely?(span when in times beam span
ForL is beam span), both economical, intensity meets the requirements, and is not take up too big use space.Beam span can be led to
Cross actual measurement to obtain.
In order that angle steel can have better performance, angle steel also meet the requirement of stability, that is, under meeting
Formula 9：
In formula 9, byFor angle steel width, tyFor angle steel thickness, lyFor angle steel length.
Angle cross section area is tried to achieve by formula 5, angle steel table is inquired about according to area, can be found out and be met b in formula 9yAnd tyAngle
Steel.
By above the step of, we can determine angle steel according to the actual objective parameter of beam, post, by the rule
The angle steel of lattice, reinforces to knaur point, you can effectively improve the bulk strength in node and house.The schematic diagram of reinforcing is as schemed
Shown in 2.
In order that overall procedure more science and refinement, this programme also includes step 4：
Step 4, determines self-tapping screw number：
Actual in conjunction with reinforcing, the computation model of the node after finding to reinforce as shown in Fig. 2 angle steel is primarily subjected to pressure, i.e.,
What the self-tapping screw being connected with beam column was primarily subjected to is shearing.For the sake of security, it will be assumed that all vertical forces on beam (according to
The maximum vertical power that beam can bear is calculating) be all to be born by self-tapping screw, i.e., do not consider the shear resistance of tenon, act on from
Power on tapping is aware of.Self-tapping screw model (the f for selecting a kind of locality more common1And r1Can determine that), so that it may needed for obtaining
The number of self-tapping screw：
Use number n that self-tapping screw is calculated using formula 6：
In formula 6, fvThe shearing strength design load of timber used by beam, areas of section of the S for beam, f1For the anti-of self-tapping screw
Cut strength failure criterion, r1Radius for self-tapping screw.
The length of angle steel wing plate can also be determined by step 5：
Step 5, determines angle steel wing plate length：
Understand that by specification the minimum range between screw and screw is 3d0, ultimate range is 16d0, screw is away from Member Lip
Minimum range is 2d0, ultimate range is 4d0.
Wing plate can be rectangle or arc, therefore the row of the self-tapping screw on wing plate width, n1Meet formula 8：
In formula 8, byFor wing plate width, d0Diameter for self-tapping screw；Thus, it is possible to obtain oneself on wing plate length direction
The row of tappingRounded using a method is entered.Thus, it is known that wing plate length l of angle steelcSpan be：
(3n2+1)d0≤lc≤(16n2-8)d0Formula 7
Angle steel should select the two ends of the angle steel with wing plate, i.e. angle steel to have bending part to be conveniently connected with beam, pillar；(such as
Shown in Fig. 3, perforate number in figure should be according to being calculated), and the angle between wing plate and angle steel is all 135 degree, pars intermedia
The length that divides and the length of two part are by being calculated.The seam application electric welding machine of angle steel and tab portions is welded,
The strength grade of weld seam is no less than the strength grade of angle steel.
This structure of angle steel, oneself can be processed, it is also possible to allow and be welded paving to process at the construction field (site).During construction, should
Where first finding angle steel and beam-to-column joint than angle steel, got off with pencil mark, with saw and chisel angle steel and beam-to-column joint
Place is evened out, enables angle steel and beam column preferably by screw connection.Should be tried one's best and the angle steel that sets up is arranged on beam column section
The middle position of point, therefore first can measure with a yardstick out when angle steel is located at middle, position of the hole on beam column, under mark
Come.Then, angle steel self-tapping screw is fixed (as shown in Figure 4) according to the mark on beam column.After angle steel sets, can be in angle steel
Upper brushing paint anti-corrosion, and the local damage that construction is caused is repaired.
The operation principle of the present invention is as follows：
During earthquake, destruction of a node is mainly shown as the forms such as out of joint and folding tenon.The rigidity of angle steel reinforced node is by Tenon section
Point rotates moment of flexure and angle steel and the restraining force of node is provided, angle steel by self-tapping screw securely together with beam-to-column joint, energy
The frictional force for enough making node be always maintained at closely, allowing between tenon and the fourth of the twelve Earthly Branches is always maintained at larger, thus node is firm when earthquake is met with
Degree is seldom degenerated and is not even degenerated, and node can be made to remain higher rigidity, meanwhile, the triangle that node and angle steel can be constituted
Shape, triangle itself also have rigidity.Therefore, at node, rigidity is larger, and the deformation of node is less, is not in phenomenon out of joint.
The connection of beam and column originally simply by Tenon node, now except Tenon node also has angle steel, both can stress jointly, allow this
The intensity of place's node is significantly increased, and bearing capacity is significantly improved, and prevents node from folding tenon phenomenon occur.
Application experiment：
The present invention is used for building field, can promote the use of in vast rural area Existing reinforced concrete bridge seismic hardening transformation.
For verifying that the effect of the present invention, inventor were entered in Xi'an University of Architecture and Technology's structural seismic laboratory in 2014
Building model shaketalle test is gone, the bean column node of the wood house model has been reinforced using this method.Test adds
9 degree of earthquakes of setting up defences are loaded onto, building model does not collapse, and node is not destroyed.
Test result indicate that：
(1) for rural area timber structure structural building, when using above measure when, can improve node bearing capacity (with
Compare before joint reinforcing) more；Meanwhile, rigidity (compared with before joint reinforcing) can be improved more.Significantly can carry during big shake
The shock resistance in high house, after being reinforced as requested, even if 9 degree of wooden frame structure experience is set up defences, during earthquake, node does not have yet
There is destruction, or even angle steel and node all there is no and deform that house does not collapse.
(2) using the joint reinforcing measure of the present invention, the angle steel for using is readily obtained and cost is relatively low, it is simple to construct.
(3) this simple and effective joint reinforcing method is suitable in earthquake district occurred frequently, highly seismic region rural area wooden frame structure
In promote the use of.
Claims (6)
1. a kind of method of employing angle steel reinforced timber structure node, it is characterised in that press with wing plate at the two ends of described angle steel
Determine after angle steel specification according to following step, be connected with beam, post by self-tapping screw using the wing plate at angle steel two ends：
Step one, measures the rotational angle of the node that needs reinforcement, and whether predicate node needs reinforcement, and then executes step if desired for reinforcing
Rapid two；
Step 2, determines the line stiffness ratio β of beam and column：
When the section of beam/post is circular, Line stiffness i is：
When the rectangular cross-section of beam/post, Line stiffness i is：
In formula 1 and formula 2, Deflection Modulus of Elasticity of the E for beam/post, diameters of the d for the circular cross-section of beam/post, circles of the b for beam/post
The width in section, height of the h for the circular cross-section of beam/post, length of the l for beam/post；
Parameter alpha1Span be [0.90,0.95], parameter alpha2Span be [0.80,0.95]；
The line stiffness ratio β of beam and column is：
Step 3, determines the specification of angle steel：
Length l of angle steelySpan isL is beam span；
The area of section S of angle steelyNeed to meet following formula 5：
In formula 5, areas of section of the S for beam, depth of section or diameter of the R for beam, line stiffness ratios of the β for beam and column, fyAnti- for angle steel
Compressive Strength design load, l1For the length of beam, equivalent strengths of the f for timber, it is [4.1,7.2] that value is scope.
2. the method for employing angle steel reinforced timber structure node as claimed in claim 1, it is characterised in that described method is also wrapped
Include step 4：
Step 4, determines self-tapping screw number：
Use number n that self-tapping screw is calculated using formula 6：
In formula 6, fvThe shearing strength design load of timber used by beam, areas of section of the S for beam, f1Shearing resistance for self-tapping screw is strong
Degree design load, r1Radius for self-tapping screw.
3. the method for employing angle steel reinforced timber structure node as claimed in claim 2, it is characterised in that described method is also wrapped
Include step 5：
Step 5, determines angle steel wing plate length：
Wing plate length l of angle steelcSpan be：
(3n2+1)d0≤lc≤(16n2-8)d0Formula 7
In formula 7, n2For the row of self-tapping screw on wing plate length direction,Round；
n1For the row of the self-tapping screw on wing plate width, n1Meet formula 8：
In formula 8, byFor wing plate width, d0Diameter for self-tapping screw.
4. the method for employing angle steel reinforced timber structure node as claimed in claim 1, it is characterised in that described angle steel specification
When determining, angle steel also needs to meet：
In formula 9, byFor angle steel width, tyFor angle steel thickness, lyFor angle steel length.
5. the method for employing angle steel reinforced timber structure node as claimed in claim 1, it is characterised in that described angle steel two ends
Wing plate and angle steel between angle be 135 °.
6. the method for employing angle steel reinforced timber structure node as claimed in claim 1, it is characterised in that described step one
In, the concrete grammar whether predicate node needs reinforcement is：
When the rotational angle of dovetail node is not less than 0.05rad, the node needs reinforcement；
When the rotational angle of straight tenon node is not less than 0.04rad, the node needs reinforcement.
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| CN110528696A (en) * | 2019-09-05 | 2019-12-03 | 扬州工业职业技术学院 | A kind of structural form of timber structure beam column Tenon joint strengthening |
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| CN102277979A (en) * | 2011-05-04 | 2011-12-14 | 南京工业大学 | Wood-structure mortise and tenon joint reinforced by energy-intensive arc-shaped steel plate |
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| CN203394100U (en) * | 2013-08-02 | 2014-01-15 | 王勇 | Reinforcement structure of reinforced concrete beam column |
| CN103711226A (en) * | 2014-01-14 | 2014-04-09 | 南京林业大学 | Reinforced wood structure mortise and tenon node of semi-rigid energy consumption device |
| CN103835525A (en) * | 2014-03-13 | 2014-06-04 | 洛阳理工学院 | Steel-wood composited reinforcement device for ancient wood frames |
| CN104153595A (en) * | 2014-08-06 | 2014-11-19 | 上海市建筑科学研究院(集团)有限公司 | Method for reinforcing mortise and tenon joints of wood frame through steel support |
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2015
- 2015-05-25 CN CN201510270632.4A patent/CN104989119B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11159001A (en) * | 1997-11-28 | 1999-06-15 | Ohbayashi Corp | Joining method of column and beam |
| CN1644832A (en) * | 2004-12-22 | 2005-07-27 | 殷曦沛 | Light steel wall structural system for constructing low and multi-storey building |
| CN101560837A (en) * | 2009-05-21 | 2009-10-21 | 西安建筑科技大学 | Method for consolidating tilting combination structure |
| CN102277979A (en) * | 2011-05-04 | 2011-12-14 | 南京工业大学 | Wood-structure mortise and tenon joint reinforced by energy-intensive arc-shaped steel plate |
| CN203049797U (en) * | 2013-01-17 | 2013-07-10 | 沈一军 | Metal connecting piece of wood structure |
| CN203394100U (en) * | 2013-08-02 | 2014-01-15 | 王勇 | Reinforcement structure of reinforced concrete beam column |
| CN103711226A (en) * | 2014-01-14 | 2014-04-09 | 南京林业大学 | Reinforced wood structure mortise and tenon node of semi-rigid energy consumption device |
| CN103835525A (en) * | 2014-03-13 | 2014-06-04 | 洛阳理工学院 | Steel-wood composited reinforcement device for ancient wood frames |
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| CN104989119A (en) | 2015-10-21 |
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