CN106599441A - Anti-collapse security evaluation method for self-support communication tower - Google Patents
Anti-collapse security evaluation method for self-support communication tower Download PDFInfo
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- CN106599441A CN106599441A CN201611126692.XA CN201611126692A CN106599441A CN 106599441 A CN106599441 A CN 106599441A CN 201611126692 A CN201611126692 A CN 201611126692A CN 106599441 A CN106599441 A CN 106599441A
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- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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Abstract
Disclosed is an anti-collapse security evaluation method for a self-support communication tower. By adoption of the anti-collapse security evaluation method, dynamic response of the self-support communication tower in a complete tower collapse process when key members are damaged under a wind load effect can be accurately simulated; the anti-collapse security of the self-support communication tower can be evaluated; by combination of conventional design software and universal finite element software, modeling of the communication tower with a large number of members can be rapidly and conveniently completed while simulation of a complex dynamic collapse complete process also can be realized; and by considering various adverse wind directions, and working conditions of damage of single members and joint damage of multiple members, the analysis result is detailed and reliable. The evaluation method disclosed by the invention is simple in analysis thought, easy to learn and master, can be used for designing a newly built tower as well as for evaluation of a net tower, so that the method can be widely popularized among tower designers, and the blank of the self-support communication tower in anti-collapse research and design is filled up.
Description
Technical field
The invention belongs to communication engineering tower mast technical field, and in particular to a kind of safety of collapsing anti-fall to self-supporting communication tower
Appraisal procedure, can be applicable to assess self-supporting communication tower under design load effect after Local Members destruction timeliness tower mast it is anti-
Collapse safety.
Background technology
Communication iron tower is the main carriers of communication signal emitting, reception and transmission equipment, is that mobile radio communication completes signal
The important infrastructure of covering.Self-supporting communication iron tower is a kind of typical highrise steel structure building, and deadweight is relatively light, therefore typically
Using wind load as design control load.Self-supporting communication tower generally includes single-pipe tower, three pipe towers and angle steel tower, wherein three pipe towers
With angle steel tower because its construction height is higher, floor space is larger, is generally used for outdoor or field open area, and it is built and makes
More severe with environment, its composition component is numerous, and Path of Force Transfer is complicated, there is certain potential safety hazard under wind action,
The accident of collapse of iron tower happens occasionally.It is therefore desirable to carry out anti-fall safety of collapsing to newly-built and existing self-supporting communication tower commenting
Estimate.
Current China only rests on the conceptual phase for the anti-fall safety evaluation that collapses of building structure, has no detailed country
Specification is used as guidance.And for anti-fall collapse safety evaluation of the communication iron tower under design load effect is even more in blank rank
Section, lacks the anti-fall safety evaluation method that collapses of a set of practicable communication tower.For the anti-fall performance of collapsing of common building structure
Analysis applies reverse internal force frequently with two benches load mode, i.e., at component failure, and the direction is removed within the out-of-service time
The mode of power is simulating component failure, and which is excessively complicated, is difficult to implement, it is difficult to popularization and application；Another aspect communication tower
Component is more, and composition is complicated, and existing general finite meta software is relatively complicated on modeling function, equally limits anti-fall safety of collapsing
Property application of the assessment on communication tower.
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, it is an object of the invention to provide a kind of anti-fall to self-supporting communication tower collapse
The appraisal procedure of safety, by simple modeling and analysis means, realizes that self-supporting communication ferrum is acted in design load
Under the Whole Process Simulation that collapses, and the anti-fall safety evaluation that collapses is carried out to it, can be not only used for the design of newly-built tower mast, it can also be used to
In the transformation of net steel tower.
For achieving the above object, the technical solution adopted in the present invention is as follows：
A kind of appraisal procedure of safety of collapsing anti-fall to self-supporting communication tower, comprises the following steps：
1）Design a model modeling：There is the Steel Structural Design software of steel tower design module to be analyzed using Midas and 3D3S
Communication tower is designed the modeling of model；
2）FE model modelings：Designing a model for steel tower is imported in common finite element program-ABAQUS, corresponding FE is set up
(Finite Element) model, gives nonlinear material this structure；
3）Unfavorable wind direction and key member are chosen：The wind load that born according to proper calculation steel tower is simultaneously chosen unfavorable wind direction and is applied
On steel tower, choosing key member according to the importance and destroying infection scope of component carries out dismounting analysis；
4）Non-linear dynamic tears post analysis open：The overall process mould that collapses of steel tower is carried out using the nonlinear dynamic analysis in ABAQUS
Intend, and removing for key member realized using post method is directly torn open, and observe the dynamic response of remaining iron tower structure, such as it is selected not
Removing for key member does not cause collapsing for steel tower under sharp wind direction, can again select unfavorable wind direction or key member is carried out point
Analysis, also can continue to remove key member or increase wind load to be analyzed on remaining tower body.
5）The anti-fall safety evaluation that collapses：The dynamic analyses knot of steel tower after being removed according to various unfavorable wind directions and key member
Really, the anti-fall safety of collapsing to steel tower is estimated, and enters for the newly-built steel tower for being unsatisfactory for anti-fall safety of collapsing and in net steel tower
Row is redesigned and strengthened.
Described step 1) in design a model modeling, select that built environment is severe, blast is big, tower body is high and Accessory Members are more
Tower be analyzed, using Midas and 3D3S have steel tower design module Steel Structural Design software be modeled, steel tower
Geometric model includes king-post, diagonal brace, stull, discharging rod, platform and antenna etc., the first six rank natural frequency of vibration of computation model, and presses
Go out the size that tower body bears wind load according to proper calculation.
Described step 2) in FE model modelings, by the software interface of design software itself, designing a model steel tower
In importing to common finite element program-ABAQUS, increase the Nonlinear Constitutive of material, and calculate the first six rank self-vibration frequency of FE models
The natural frequency of vibration designed a model in rate, with step (1) carries out contrast verification, using all kinds of components of Truss unit simulation steel towers,
Material Rayleigh damping and density are given, applies gravitational acceleration field.
Described step 3) in unfavorable wind direction and key member choose, according to the wind that each tower section of proper calculation steel tower is born
Load, and the constructive direction of the prevailing wind direction according to building site and steel tower chooses unfavorable wind direction, and wind load is applied to into steel tower
In each tower section, choosing key member according to the importance and destroying infection scope of tower body structure component carries out dismounting analysis.
Described step 4) in non-linear dynamic tear open post analysis, using implicit expression dynamic analyses (Implicit in ABAQUS
Dynamic Analysis) module carries out the Whole Process Simulation that collapses of steel tower, and using unit module (* Element are changed
Change the destruction that key member is simulated in order (* Remove) is removed in), it is substantially all that the time to rupture of key member takes steel tower
/ 10th (0.1T) of phase, enough analysis durations are added after key member is removed makes the vibration of remaining iron tower structure become
In stablizing, with the dynamic response of observation structure, removing for key member does not cause falling for steel tower such as in the case where unfavorable wind direction is selected
Collapse, can again select unfavorable wind direction or key member, repeat above step and be analyzed, also can continue to remove on remaining tower body
Key member or increasing wind load are analyzed, until completing various unfavorable wind directions and whole key members analyses, can be to the ferrum
Tower carries out the anti-fall safety evaluation that collapses.
Described step 5) in the anti-fall safety evaluation that collapses, steel tower after being removed according to various unfavorable wind directions and key member
Dynamic analyses result, the anti-fall safety of collapsing to steel tower is estimated, the tower top position that the code requirement that can relatively guard specifies
Move limit value to be estimated, it would however also be possible to employ whether computation structure loses the standard of whole bearing capacitys is estimated, the former can be with
Ensure the normal work of steel tower, the latter is then used for ensureing that steel tower does not result in major accident, for the selection of wind load, both can be with
Investigate anti-fall collapse performance of the steel tower under designed wind load, it is also possible to investigate steel tower in anti-fall performance of collapsing seldom to the wind under load,
And redesigned and strengthened for the newly-built steel tower for being unsatisfactory for anti-fall safety of collapsing and in net steel tower, then repeat to walk above
Suddenly, until meeting the anti-fall security requirement of collapsing of steel tower.
Described key member is the bottom column of each tower section, king-post, the king-post below platform and the connection of bearing pressure
The more king-post of component.
The invention has the beneficial effects as follows：
1）Conventional finite element software is modeled using command stream, more inconvenient when complicated structural style model is set up, therefore
The steel tower MBM for being familiar with design software Midas or 3D 3S using professional steel tower designer carries out the modeling of computation model,
Imported by special purpose interface afterwards and FE models are set up in finite element software, give the corresponding member section of model and non-linear material
Property, such modeling pattern is simple to operate, is easy to designer to use.
2）FE models can carry out accurate collapse of iron tower Dynamic time history analysis, when showing steel tower in collapsing procedure arbitrarily
The stress state at quarter, is easy to designer to summarize to result analysis.FE models can carry out any component under any wind direction
The anti-fall security performance of collapsing of steel tower after destruction, and the simulation of many component joint destruction operating modes can be carried out.
3）Different from conventional two benches loading simulation component damage, the present invention tears post method open and enters using advanced direct driving force
The simulation of row component damage, component and time to rupture that designer destroys needed for can directly setting on FE models, you can mould
Intend the real dynamic response of steel tower after component damage, it is intuitive and reliable.
4）For any wind direction, any solid memder and many Components Analysis results, using tower top position locomotivity time-history curves identifying
The comprehensively detailed anti-fall safety evaluation that collapses is carried out to steel tower with IDE Dependence Results, you can for the design of newly-built steel tower, also may be used
For in the Strengthening Design of net steel tower.This method has filled up the vacancy of self-supporting communication Deethanizer design.
Description of the drawings
Fig. 1 is the workflow schematic diagram of the present invention.
Specific embodiment
As shown in figure 1, a kind of appraisal procedure of safety of collapsing anti-fall to self-supporting communication tower, comprises the following steps：
1）Design a model modeling：Select built environment it is severe, blast is big, tower body is high and Accessory Members more than tower be analyzed,
The Steel Structural Design software for designing module with steel tower using Midas and 3D3S more conventional in steel tower design etc. is designed
The modeling of model.The geometric model of steel tower is set up according to drawing, including king-post, diagonal brace, stull, discharging rod, platform and antenna etc.,
And give sectional dimension of members and elastic material properties.The first six rank natural frequency of vibration of computation model, and go out tower according to proper calculation
Body bears the size of wind load, and the vertical load of steel tower is mainly the gravity load of each component of tower body.
2）FE model modelings：By the software interface of design software itself, designing a model steel tower to import to and general have
In limit meta software ABAQUS, the information in designing a model is mainly including geometric model, bar cross section attribute, the elastomeric material of steel tower
Attribute and boundary condition, so as to set up corresponding FE (Finite Element) model, increase the Nonlinear Constitutive of material, and count
The natural frequency of vibration for designing a model calculated using Midas or 3D3S in the first six rank natural frequency of vibration of calculation FE models, with step (1) is entered
Row contrast verification.Using all kinds of components of Truss unit simulation steel towers.Material Rayleigh damping and density are given, is applied gravity and is added
Velocity field.
3）Unfavorable wind direction and key member are chosen：According to the wind load that each tower section of proper calculation steel tower is born, and according to
The prevailing wind direction of building site and the constructive direction of steel tower choose unfavorable wind direction, wind load are applied in each tower section of steel tower, root
Choosing key member according to the importance and destroying infection scope of tower body structure component carries out dismounting analysis, such as the bottom of each tower section
More king-post of king-post and connecting elements below post, the king-post for bearing pressure, platform etc..
4）Non-linear dynamic tears post analysis open：The wind load in step (3) is applied to into ferrum initially with static analysis module
On tower, then collapsing for steel tower is carried out using implicit expression dynamic analyses in ABAQUS (Implicit Dynamic Analysis) module
Whole Process Simulation.Changed in module (* Element change) using unit and remove order (* Remove) simulation key member
Destruction, according to specification and existing research, the time to rupture of key member takes 1/10th (0.1T) of steel tower basic cycle, and
Enough analysis durations are added after key member is removed makes the vibration of remaining iron tower structure tend towards stability, with observation structure
Dynamic response.Such as in the case where unfavorable wind direction is selected, removing for key member does not cause collapsing for steel tower, can again select unfavorable wind
To or key member, repeat above step and be analyzed, also can continue to remove key member on remaining tower body or add strong wind lotus
Load is analyzed, and until completing various unfavorable wind directions and whole key member analyses, anti-fall safety of collapsing can be carried out to the steel tower
Assessment.
5）The anti-fall safety evaluation that collapses：The dynamic analyses knot of steel tower after being removed according to various unfavorable wind directions and key member
Really, the anti-fall safety of collapsing to steel tower is estimated, and the tower top limit displacement value that the code requirement that can relatively guard specifies is carried out
Assessment, it would however also be possible to employ whether computation structure loses the standard of whole bearing capacitys is estimated, and the former can ensure that steel tower
Normal work, the latter is then used for ensureing that steel tower does not result in major accident.For the selection of wind load, steel tower can be both investigated and exist
Anti-fall performance of collapsing under designed wind load, it is also possible to investigate steel tower in anti-fall performance of collapsing seldom to the wind under load.And for discontented
The newly-built steel tower of the anti-fall safety of collapsing of foot and redesigned and strengthened in net steel tower, then repeatedly above step, Zhi Daoman
The anti-fall security requirement of collapsing of sufficient steel tower.As steel tower inconvenience is redesigned or strengthened, then the tower for changing newly-built steel tower is considered
Type or to removing in net steel tower.
Claims (7)
1. a kind of appraisal procedure of safety of collapsing anti-fall to self-supporting communication tower, it is characterised in that comprise the following steps：
1）Design a model modeling：There is the Steel Structural Design software of steel tower design module to be analyzed using Midas and 3D3S
Communication tower is designed the modeling of model；
2）FE model modelings：Designing a model for steel tower is imported in common finite element program-ABAQUS, corresponding FE is set up
(Finite Element) model, gives nonlinear material this structure；
3）Unfavorable wind direction and key member are chosen：The wind load that born according to proper calculation steel tower is simultaneously chosen unfavorable wind direction and is applied
On steel tower, choosing key member according to the importance and destroying infection scope of component carries out dismounting analysis；
4）Non-linear dynamic tears post analysis open：The overall process mould that collapses of steel tower is carried out using the nonlinear dynamic analysis in ABAQUS
Intend, and removing for key member realized using post method is directly torn open, and observe the dynamic response of remaining iron tower structure, such as it is selected not
Removing for key member does not cause collapsing for steel tower under sharp wind direction, can again select unfavorable wind direction or key member is carried out point
Analysis, also can continue to remove key member or increase wind load to be analyzed on remaining tower body；
5）The anti-fall safety evaluation that collapses：The dynamic analyses result of steel tower, right after being removed according to various unfavorable wind directions and key member
The anti-fall safety of collapsing of steel tower is estimated, and carries out again for the newly-built steel tower for being unsatisfactory for anti-fall safety of collapsing and in net steel tower
Design and reinforcement.
2. the appraisal procedure of a kind of safety of collapsing anti-fall to self-supporting communication tower according to claim 1, it is characterised in that
Described step 1) in design a model modeling, select that built environment is severe, blast is big, tower body is high and Accessory Members more than tower enter
Row analysis, using Midas and 3D3S there is the Steel Structural Design software of steel tower design module to be modeled, the geometric model of steel tower
Including king-post, diagonal brace, stull, discharging rod, platform and antenna etc., the first six rank natural frequency of vibration of computation model, and according to specification meter
Calculate the size that tower body bears wind load.
3. the appraisal procedure of a kind of safety of collapsing anti-fall to self-supporting communication tower according to claim 1, it is characterised in that
Described step 2) in FE model modelings, by the software interface of design software itself, by steel tower design a model import to it is logical
With in finite element software ABAQUS, increase the Nonlinear Constitutive of material, and calculate the first six rank natural frequency of vibration of FE models, with step
(1) natural frequency of vibration designed a model in carries out contrast verification, using all kinds of components of Truss unit simulation steel towers, gives material
Rayleigh damping and density, apply gravitational acceleration field.
4. the appraisal procedure of a kind of safety of collapsing anti-fall to self-supporting communication tower according to claim 1, it is characterised in that
Described step 3) in unfavorable wind direction and key member choose, according to the wind load that each tower section of proper calculation steel tower is born, and
Unfavorable wind direction is chosen according to the prevailing wind direction of building site and the constructive direction of steel tower, wind load is applied to into each tower section of steel tower
On, choosing key member according to the importance and destroying infection scope of tower body structure component carries out dismounting analysis.
5. the appraisal procedure of a kind of safety of collapsing anti-fall to self-supporting communication tower according to claim 1, it is characterised in that
Described step 4) in non-linear dynamic tear open post analysis, using implicit expression dynamic analyses (Implicit Dynamic in ABAQUS
Analysis) module carries out the Whole Process Simulation that collapses of steel tower, and using unit the shifting in module (* Element change) is changed
Except the destruction of key member is simulated in order (* Remove), the time to rupture of key member takes 1/10th of the steel tower basic cycle
(0.1T) enough analysis durations, are added after key member is removed makes the vibration of remaining iron tower structure tend towards stability, to see
The dynamic response of structure is examined, such as removing for key member does not cause collapsing for steel tower in the case where unfavorable wind direction is selected, and can select again
Fixed unfavorable wind direction or key member, repeat above step and are analyzed, also can continue to remove on remaining tower body key member or
Increase wind load to be analyzed, until completing various unfavorable wind directions and whole key member analyses, the steel tower can be carried out anti-fall
Collapse safety evaluation.
6. the appraisal procedure of a kind of safety of collapsing anti-fall to self-supporting communication tower according to claim 1, it is characterised in that
Described step 5) in the anti-fall safety evaluation that collapses, the dynamic analyses of steel tower after being removed according to various unfavorable wind directions and key member
As a result, the anti-fall safety of collapsing to steel tower is estimated, and the tower top limit displacement value that the code requirement that can relatively guard specifies enters
Row assessment, it would however also be possible to employ whether computation structure loses the standard of whole bearing capacitys is estimated, and the former can ensure that steel tower
Normal work, the latter then be used for ensure that steel tower does not result in major accident, for the selection of wind load, can both investigate steel tower
Anti-fall performance of collapsing under designed wind load, it is also possible to investigate steel tower in anti-fall performance of collapsing seldom to the wind under load, and for not
Meet the newly-built steel tower of anti-fall safety of collapsing and redesigned and strengthened in net steel tower, then repeatedly above step, until
Meet the anti-fall security requirement of collapsing of steel tower.
7. the appraisal procedure of a kind of safety of collapsing anti-fall to self-supporting communication tower according to claim 4, it is characterised in that
Described key member be each tower section bottom column, bear pressure king-post, the king-post below platform and connecting elements it is more
King-post.
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| CN109858161A (en) * | 2019-02-01 | 2019-06-07 | 东北大学 | A kind of Abaqus Meshing Method based on Midas modeling and Matlab conversion |
| CN109933894A (en) * | 2019-03-12 | 2019-06-25 | 杭州建工集团有限责任公司 | A kind of towering structure mechanical removal method based on numerical simulation |
| CN111119552A (en) * | 2019-12-17 | 2020-05-08 | 上海国动网络通信有限公司 | Communication tower anti-collapse device |
| CN111340377A (en) * | 2020-02-28 | 2020-06-26 | 交通运输部天津水运工程科学研究所 | Method for evaluating anti-collapse capability of bottom-layer irregular masonry structure |
| CN114997016A (en) * | 2022-06-15 | 2022-09-02 | 中国水利水电科学研究院 | Deformation coordination analysis and control technology for 200-meter-level tooth climbing type ship lift tower column and key equipment |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109858161A (en) * | 2019-02-01 | 2019-06-07 | 东北大学 | A kind of Abaqus Meshing Method based on Midas modeling and Matlab conversion |
| CN109933894A (en) * | 2019-03-12 | 2019-06-25 | 杭州建工集团有限责任公司 | A kind of towering structure mechanical removal method based on numerical simulation |
| CN111119552A (en) * | 2019-12-17 | 2020-05-08 | 上海国动网络通信有限公司 | Communication tower anti-collapse device |
| CN111340377A (en) * | 2020-02-28 | 2020-06-26 | 交通运输部天津水运工程科学研究所 | Method for evaluating anti-collapse capability of bottom-layer irregular masonry structure |
| CN111340377B (en) * | 2020-02-28 | 2023-05-09 | 交通运输部天津水运工程科学研究所 | Method for evaluating collapse resistance of bottom irregular masonry structure |
| CN114997016A (en) * | 2022-06-15 | 2022-09-02 | 中国水利水电科学研究院 | Deformation coordination analysis and control technology for 200-meter-level tooth climbing type ship lift tower column and key equipment |
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Application publication date: 20170426 |