CN101672702A - Assessment method for stress of building member in slippage - Google Patents
Assessment method for stress of building member in slippage Download PDFInfo
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- CN101672702A CN101672702A CN200810042951A CN200810042951A CN101672702A CN 101672702 A CN101672702 A CN 101672702A CN 200810042951 A CN200810042951 A CN 200810042951A CN 200810042951 A CN200810042951 A CN 200810042951A CN 101672702 A CN101672702 A CN 101672702A
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Abstract
The invention relates to an assessment method for dynamic stress of a building member in slippage. The assessment method for the stress of the building member in the slippage comprises stress and deformation analysis for two-end sections and a middle span section of a rod-shaped building member according to the dead weight of the member, a connection mode with an adjacent member and the load borneby the member; and during the analysis, the dynamic effect produced by overcoming static friction resistance in wind load and the slippage is needed to be taken into consideration. The technical scheme combines the dynamic practical working condition and the stress and deformation conditions of the assessed member and the building thereof, and perform the integral slippage activity of the building more accurately and economically, thereby not only avoiding the hidden trouble or occurrence of safety accidents, but also implementing the slippage economically, preventing excessive strengtheningmeasure, saving the time of the slippage activity, and improving the utilization efficiency of buildings, blast furnaces and the like.
Description
(1) technical field
The invention belongs to buildings and member a kind of assessment methods under given conditions thereof such as blast furnace, particularly relate to a kind of assessment method of building element dynamic stress in migration.
(2) background technology
Blast furnace is long because of the duration of runs, operation under hot conditions for a long time, and body of heater reaches a generation after furnace life, need change it.It is an essential and huge job engineering project that blast furnace is changed.In traditional replacing, basically based on original place dismounting and change mounting means, like this can some months consuming time, the stopping production in the some months will cause very big economic loss.
So the new method that a kind of blast furnace slippage is changed is suggested, the blast furnace integral cutting that soon need change, lifting, need change the blast furnace integral slipping by the makeshift of building and leave the former address, and new blast furnace part is slid onto the former address again install, wherein many engineerings, work can be carried out synchronously, have saved replacing, set-up time greatly.
Yet buildings and member thereof are in slipping, because the change of boundary condition causes that structural internal force heavily distributes.The stress of partial component increases, and sometimes even can cause the distortion of total or the destruction of collapsing, has serious potential safety hazard.The slipping of same other kind buildings also exists had both wanted to accelerate sliding velocity, wished to improve the problem of security in its slipping again.
For guaranteeing the security of building member in the moving process, must test and assess in advance to each member and blast furnace buildings.The detection case history of the detection evaluation method of existing multiple structural elements and structural elements damage at present, but to the research of check and analysis in the structural entity moving process and safety assessment method still in exploration.Therefore, press for a kind of buildings and member thereof stressed assessment method in slipping is provided.
(3) summary of the invention
The purpose of this invention is to provide detection and the assessment method of a kind of blast furnace building member at moving process, being intended to comprehensively existing steel building detects and assessment method, and integrated structure stress in the replacing process is not stopped paying out the characteristics of changing, propose the concrete more in detail dynamic security of a cover and detect assessment method, make building member more realistic with evaluation in the detection of moving process.
Purpose of the present invention is realized by following technical scheme.
The assessment method for stress of a kind of building member in slippage, comprise the structural elements that is shaft-like, the load that bears by the deadweight of member, with adjacent members connected mode and member carries out the stressed and deformation analysis in cross section, member relevant position, it is characterized in that: when carrying out the stressed and deformation analysis of member two end sections and middle spaning middle section, need to consider that wind carries and overcome the dynamic effect that static friction force produces during slippage.
Described wind-force is 1 to 10 grade, and corresponding wind speed (meter per second) sees the following form, the pressure of generation (newton/centimetre
2) be worth with the member front face area and calculate, analyze.
| Wind-force | ??1 | ??2 | ??3 | ??4 | ??5 | ??6 | ??7 | ??8 | ??9 | ??10 |
| Wind speed | ??0.3-1.5 | ??1.6-3.3 | ??3.4-5.4 | ??5.5-7.9 | ??8.0-10.7 | ??10.8-13. ??8 | ??13.9-17. ??1 | ??17.2-20. ??7 | ??20.8-24. ??4 | ??24.5-28. ??4 |
| Pressure | ??5.63e-5 ??～1.41e- ??3 | ??1.6e-3～ ??6.8e-3 | ??7.23e-3 ??～0.02 | ??0.02～0. ??04 | ??0.04～0. ??07 | ??0.07～0. ??12 | ??0.12～0. ??18 | ??0.18～0. ??27 | ??0.27～0. ??37 | ??0.27～0. ??50 |
Stiction F=G * the f that overcomes when mobile
In the formula: G is that construction weight (newton), f are that friction coefficient, F are the power (newton) opposite with glide direction.Because wind-force has not allowed to move greater than 10 grades again, so this programme is no longer enumerated the force value greater than 10 grades of corresponding generations, calculating.
To stressed, the deformation result of described member, propose to do focus efforts on special areas and/or technical finesse and/or the normal suggestion of using to member.
To the set of all described member stress, deformation result, buildings is proposed: the slippage or the normal conclusion of slippage behind unsuitable slippage, the reinforcement and strengthening.
Adopt the technical program, the power that has superposeed and dynamically applied on the force analysis basis of original static state meets truth more, the component node that calculates, cross-sectional strength reduction actual conditions, correctly judge the security of member under mobile condition, meet accident in the unlikely generation slippage.
The technical program also can suit to the design of building member, to stand needs stressed in the slippage from now on.
The evaluation of described buildings is made up of the evaluation set of each member, finally proposes buildings: the conclusion and the suggestion of slippage or normally slippage behind unsuitable slippage, the reinforcement and strengthening.
By statistics, after the employing the technical program, safe slippage, the quality assurance level obviously improves, and the incident of caving in takes place again.
Beneficial effect of the present invention and advantage: adopt the technical program, stressed and the distortion situation of dynamically actual condition analysis of combination more, evaluation member and buildings thereof, more correctly, carry out the slippage activity economically, both avoided the generation of security incident, carry out slippage again economically, prevent excessive strengthening measure, saved the time of slippage activity, improved the utilization ratio of buildings, blast furnace etc.
(4) description of drawings
Fig. 1 is the front-side frame synoptic diagram of a kind of embodiment blast furnace of the assessment method for stress of building member of the present invention in slippage framework test and appraisal blast furnace;
Fig. 2 is the high furnace frame side schematic view;
Fig. 3 is a high furnace frame floor plan synoptic diagram.
(5) specific implementation method
Further specify technical solution of the present invention below in conjunction with accompanying drawing.
Certain blast furnace top facility (more than 49.7 meters) overall pulling down engineering structure safety evaluation.
The general introduction of body of heater steel-frame structure
Existing blast furnace steel frame is a single span composite steel framed structure, is divided into lower frame, furnace body frame and furnace roof rigid frame.The lower frame lower axis is of a size of 28.0m * 28.0m, and top is 21m * 21m; The furnace body frame axis is of a size of 21m * 21m; Furnace roof rigid frame lower axis is of a size of 21m * 21m, and the top is 21m * 7m.Blast furnace is positioned among the furnace body frame, top frame supporting furnace roof equipment.This overhaul, old furnace roof is removed old body of heater from all changing more than the 46.3m after the new whole installations of furnace roof again, more renews body of heater.
The furnace roof top facility
The furnace roof top facility, comprise gas up take, downtake system, no bell system (removing in advance), furnace top frame system and charging apparatus, about 3200 tons of gross weight, highly be 66m (from 49.7m platform meter), the centre of gravity place of this part is highly located about distance 49.7m platform 20m, and four gas up takes are load-carrying members, belongs to the part of high furnace frame structure.Charging apparatus weight is passed to the basis through furnace shell, does not act on the body of heater steel frame.
Consideration needs to guarantee the security of furnace top system replacing process in the overhaul demolishing process, need carry out the security checking computations to the overhaul process.According to owner's requirement, need shift out the old furnace top frame structure in the work progress, existing furnace body frame structure to old furnace top system overall pulling down and old furnace shell and carry out that scene detected and safety of structure is evaluated.
Detect content
Deformation detection
(1) amount of deflection detection, the detection of (2) verticality, the detection of (3) tedge residual thickness, (4) integral level displacement detecting, (5) whole perpendicular displacement, (6) post edema with the heart involved prosposition move, (7) size is checked.
Carrying out flaw detection
Four positions such as high furnace frame post, frame joint, tedge node, material loading vestibule node are being carried out ultrasound wave, magnetic powder inspection respectively.
High-strength bolt detects
When high-strength bolt is carried out anti-slip coefficient, tension, the test of axle power, adopt SM41 material steel plate, be made into breadboard with the M22 high-strength bolt and simulate.
Apparent and damage check
Checking computations analysis software and method
Structure analysis adopts common finite element soft SA P20009.1.6 to carry out structural modeling and analysis, and the bulk deformation of structure and the intensity and the stability of member are analyzed checking computations;
According to the method and the formula of norm of steel structure regulation, the intensity that adopts strenthening member in the manual checking computations framed structure is with stable;
Adopt finite element software ANSYS8.1 to carry out the explication de texte of important connected node.
The static(al) flexibility analysis
Respectively at the difference in work progress construction operating mode and the combination of different load, check the bulk deformation, deformation of members, the stress state of member, the resistance to overturning that node connects stress and structure of old furnace top system and furnace body frame.Analyzing main result comprises:
1) furnace body frame (existing structure that absolute altitude 46.3m is following)
(1) internal force of each member of furnace body frame, node;
(2) strength check of each member of furnace body frame;
(3) stability of each member of furnace body frame is checked;
(4) bulk deformation of furnace body frame and stability;
(5) main node security checking computations.
2) old furnace top system (existing structure that absolute altitude 46.3m is above)
(1) internal force of each member of old furnace top system, node;
(2) strength check of old each member of furnace top system;
(3) stability of old each member of furnace top system is checked;
(4) bulk deformation of old furnace top system and stability.
Structural modeling
Set up the computation model of old furnace top system, furnace body frame and slippage beam respectively.
The structure analysis operating mode
Operating mode 1---old furnace top system jacking process
In the old furnace top system jacking process, when needing the old furnace top system of checking computations by jack-up, the security of the distortion of old furnace top frame and furnace body frame, member, node and structure.Theoretical Calculation need be considered the vertical dynamic effect that the jacking initial time may produce in structure.
Operating mode 2---old furnace top system slipping
In whole slipping, need a plurality of positions of the old furnace top system of checking computations, according to arrangement and method for construction, just
Step is defined as following position:
Position one: the position that old furnace top system begins to slide;
Position two: old furnace top system center of gravity is positioned at furnace body frame side column capital position;
Position three: old furnace top system is positioned at the furnace body frame structure outside, produces the position of big internal force in the furnace body frame post.
1) position one
When beginning to slide, old furnace top system need check the toppling of distortion, member, node and structure of old furnace top frame.
2) position two
Old furnace top system center of gravity is positioned at furnace body frame side column capital position, needs the distortion of checking computations furnace body frame and the security of member, node and structure.
3) position three
Old furnace top system is positioned at the furnace body frame structure outside, produces the position of big internal force in the furnace body frame post, needs the distortion of checking computations furnace body frame and the security of member, node and structure this moment.
Operating mode 3---new furnace top frame installation, old furnace shell shifts out the furnace body frame process
New furnace top frame installation, top and middle part body of heater are suspended on absolute altitude 46.3m and 37.2m platform respectively, the distortion of checking computations furnace body frame structure and the security of member, node and structure.
Old furnace body frame static(al) flexibility analysis result
Old furnace top system jacking process
In the old furnace top system jacking process, need several stresses of old furnace body frame are carried out the intensity of member, stable and malformation checking computations
Old furnace top system slipping
New furnace top frame installation, old furnace shell shifts out the furnace body frame process
The node finite element analysis
Node calculates purpose
Old furnace top system overall pulling down and old furnace shell shift out the old furnace top frame structure in the work progress, existing furnace body frame structure stress is comparatively complicated, shift out work progress for the old furnace shell of this large-tonnage and still do not have ripe engineering experience at present.Therefore, safe and reliable for guaranteeing work progress, adopt finite element analysis software ANSYS that stressed bigger node in the above-mentioned two-part structure is carried out finite element analysis,, and provide the guidance foundation for its construction for the security of the framed structure in the blast furnace system rebuilding construction process is advised.
The formation of node
The position of computing node in structure
Cell type
Adopt the SHELL181 unit in the node analysis, it is suitable for analyzing the structure of being made up of thin plate and cut deal.There are four nodes the unit, and each node has six-freedom degree, is respectively along x, y, the translational degree of freedom of three directions of z and around x, y, the rotational freedom of three directions of z.Be applicable to linear analysis, rotation and big strain nonlinear analysis greatly, also be applicable to linear elasticity material, elastic-plastic material, creep and elastic material.The geometric mode of unit is shown in Fig. 7 .8.
Material constitutive relation and the accurate side of surrender
The material constitutive relation
Get ideal elastoplastic model, elastic modulus E=2.06E5MPa, yield strength F
y=345MPa, Poisson ratio PRXY=0.3.
Surrender accurate side
During this node calculates, adopt the Mises yield condition, it represents that material begins to enter mecystasis, is formulated as when stress intensity reaches certain numerical value:
σ
i＝k
The Mises yield condition has been considered the influence of intermediate principal stress to surrender, illustrates that surrender and three principle stresses all have relation, mainly are applicable to the ductile metal material.
Finite element model
According to the design load and/or the internal force of node, respectively to nodal analysis method load application and constraint reaction.In the loading, axle power press on the member section node sum mean allocation and is arrived each node, and vertical shear on average is applied on the web node, and horizontal shear on average is applied on the node of the edge of a wing; Moment of flexure, torque axis change couple into and are added on the node of cross section, and the bottom of pillar is a stiff end.Since node 1,2 symmetries, a finite element model adopted, but the load difference that applies.
Node is under above-mentioned load action, and maximum stress appears at upper prop and node junction, maximum stress be 219.54MPa (＜310MPa) satisfy requirement of strength.
Claims (5)
1. the assessment method for stress of a building member in slippage, as the rod shaped structure member, the load that bears by the deadweight of member, with adjacent members connected mode and member carries out the stressed and deformation analysis in cross section, member relevant position, it is characterized in that: when carrying out the stressed and deformation analysis of member two end sections and middle spaning middle section, need to consider that wind carries and overcome the dynamic effect that static friction force produces during slippage.
2. assessment method for stress according to claim 1 is characterized in that described wind-force is 1 to 10 grade, and corresponding wind speed (meter per second) sees the following form, the pressure of generation (newton/centimetre
2) be worth with the member front face area and calculate, analyze
。
3. assessment method for stress according to claim 1 is characterized in that the stiction F=G * f that overcomes when mobile
In the formula: G is that construction weight (newton), f are that friction coefficient, F are the power (newton) opposite with glide direction.
4. assessment method for stress according to claim 1 is characterized in that stressed, deformation result to described member, proposes need do focus efforts on special areas and/or technical finesse and/or the normal suggestion of using to member.
5. assessment method for stress according to claim 4 is characterized in that the set to all described member stress, deformation result, proposes buildings: the slippage or the normal conclusion of slippage behind unsuitable integral slipping, the reinforcement and strengthening.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810042951A CN101672702A (en) | 2008-09-12 | 2008-09-12 | Assessment method for stress of building member in slippage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101923597A (en) * | 2010-09-16 | 2010-12-22 | 天津大学 | Visual modeling method for simulating stress change of building in moving process |
| CN110196990A (en) * | 2019-04-19 | 2019-09-03 | 中国人民解放军63921部队 | Spatial mesh structure Wind Engineering analysis method across superelevation greatly |
-
2008
- 2008-09-12 CN CN200810042951A patent/CN101672702A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101923597A (en) * | 2010-09-16 | 2010-12-22 | 天津大学 | Visual modeling method for simulating stress change of building in moving process |
| CN101923597B (en) * | 2010-09-16 | 2012-02-15 | 天津大学 | Visual modeling method for simulating stress change of building in moving process |
| CN110196990A (en) * | 2019-04-19 | 2019-09-03 | 中国人民解放军63921部队 | Spatial mesh structure Wind Engineering analysis method across superelevation greatly |
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Open date: 20100317 |