CN103942367A - Manufacturing, installation and pre-deformation method for large-span spatial special-shaped steel structure - Google Patents
Manufacturing, installation and pre-deformation method for large-span spatial special-shaped steel structure Download PDFInfo
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- CN103942367A CN103942367A CN201410122374.0A CN201410122374A CN103942367A CN 103942367 A CN103942367 A CN 103942367A CN 201410122374 A CN201410122374 A CN 201410122374A CN 103942367 A CN103942367 A CN 103942367A
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Abstract
The invention belongs to the technical field of construction of steel structures, and particularly relates to a manufacturing, installation and pre-deformation method for a large-span spatial special-shaped steel structure. The manufacturing, installation and pre-deformation method particularly comprises the following steps that a calculation model is built; pre-deformation load conditions are determined; three-dimensional deformation values of all nodes are obtained; a three-dimensional model after first-time pre-deformation is built; deformation difference values of the nodes are extracted, and comparison and analysis are conducted; according to the range of the difference values, a pre-deformation adjustment value is further determined; finally, the structure is installed. The manufacturing, installation and pre-deformation method is simple, convenient to implement and effective for manufacturing and installation of the spatial special-shaped steel structure, so that the appearance of the spatial special-shaped steel structure is the same as an initial target appearance set by the design is guaranteed.
Description
Technical field
The invention belongs to construction steel structure technical field, be specifically related to a kind of space greatly across special-shaped steel structure fabrication and installation predeformation method.
Background technology
In recent years, along with scientific and technological progress, the development of local economy, construction style is in order to cater to atmosphere and the development trend of local area culture, and spacial special-shaped building is more and more.Spacial special-shaped steel construction is because its appearance and modeling is unique, merrily and lightheartedly beautiful, often becomes local landmark building, has promoted the class in city, has driven the prosperity of local economic development, culture.Moreover, space is greatly across steel construction traditional structure form different from the past, and because the steel ratio of strength to weight and other materials relatively have obvious advantage, its vertical support spacing often can be relatively far apart, and larger headroom can be provided.Therefore, space all has outstanding behaviours across special-shaped steel structure in outward appearance performance and space use greatly.
Steel building starts from conceptual design till finally land and exercise its use function, in this whole process, experience the four-stage that design point, making state, Construction State and completion state are representative.Wherein design point is the initial target form of structure, and the position shape after Practical Completion should be as much as possible near design point.Making state is the member blanking form of considering after structure predeformation.Construction State is that structure installs, the form of temporary supporting system under not yet removing; According to predefined arrangement and method for construction, the member after predeformation is formed to the position shape after an integral body according to corresponding coordinate points position after adjusting.All Majors complete, and Construction State is removed after temporary supporting system, and structure can be exercised its independent function of using, and is completion state; Actual, the position shape under this state can not with the design point target bit shape form that is consistent, but within error between the two can be controlled in a less scope, thereby the final form that has guaranteed structure and initial target form is identical.
Just because of the cause such as space is irregular across special-shaped steel structure profile greatly, span is larger has brought many difficult problems often to making and the installation of member.Wherein how structure steel fabrication, installation accuracy guarantee it is a problem of comparatively giving prominence to, especially for those spans compared with large and rigidity compared with weak flexible structure, this problem is more remarkable.Because the intensity of steel is larger, the member section adopting is smaller comparatively speaking, cause stiffness of structural member weak, and spatial steel structure is generally had relatively high expectations to span, if do not take corresponding measure, the Form of Architecture inevitably finally obtaining is difficult to reach the physical dimension requirement of designer's anticipation; Moreover, the error that steel construction causes may cause the relevant speciality (such as specialties such as roof decorations, curtain walls) cannot normal construction; In the time of serious, even can cause safely adverse effect to total.
In view of the above problems, space not only will meet the apparent size of designing requirement across special-shaped steel structure greatly, will meet the requirement of each specialty to steel construction error, be to address the above problem one of effective measures therefore steel construction is taked predeformation measure when making, installing simultaneously.Most steel construction predeformation was to adjust by the setting position of the assembled moulding bed in working-yard in the past, this method generally can only be considered one-dimensional linear arch camber, during making, member is elongated or shortened to realize, and adjustment to three direction predeformation of structure, the field conduct difficulty of getting up is very big.Therefore, the method is limited by on-the-spot operating technique ability, and installation accuracy is also difficult to guarantee.
Therefore, the present invention is directed to space greatly across special-shaped steel structure, provide a kind of space greatly across special-shaped steel structure fabrication and installation predeformation method, therefore this case produces.
Summary of the invention
A kind of space provided by the present invention is greatly across special-shaped steel structure fabrication and installation predeformation method, object is that making, the installation for spacial special-shaped steel construction provides a kind of simple and effective way, thereby guarantees the mode of appearance and the anastomose property that designs given initial target form of structure; Realize to a certain extent the requirement of slip-stick artist to architectural appearance, met the requirement of other specialties to steel construction precision simultaneously.
For achieving the above object, the concrete technical scheme of the present invention is as follows: a kind of space is greatly across special-shaped steel structure fabrication and installation predeformation method, and concrete steps are as follows:
The first step, sets up computation model by steel construction drawing;
Second step, according to building, the requirement of structure to predeformation, determines load case when predeformation is calculated;
The 3rd step, adopts finite element software to carry out construction simulation analysis, obtains the 3 D deformation value of each node of steel construction;
The 4th step, the deformation values of each node that " the 3rd step " calculated, utilize conventional data processing tools that deformation values opposite sign is added under initial designs state on corresponding node coordinate, thereby obtain the coordinate of model after a predeformation, according to this coordinate, set up the three-dimensional model after predeformation one time.
The 5th step, column joints deformation difference is extracted, and compares analysis; Utilize the model after predeformation one time, import in software for calculation, carry out above-mentioned " second step " and " the 3rd step " operation, check; The deformation values and the predeformation value that after construction simulation is completed, obtain are carried out difference calculating, and difference is done to statistics comparative analysis.
The 6th step, if the difference that " the 5th step " obtains is within allowed band, the deformation values that " the 3rd step " calculates is predeformation adjusted value by its opposite sign, and the model after a predeformation that then can obtain according to " the 4th step " carries out Deepen Design, and blanking is made; Through comparing, if the difference result obtaining has exceeded allowed band, in the computation model that needs this difference to be added to after predeformation for the first time, carry out again " the 5th step " operation, until simulation obtains the structural form of construction after finishing and the coordinate difference between initial designs form within allowed band; Thereby be met the model after the predeformation of accuracy requirement, then carry out Deepen Design, blanking is made.
The 7th step, structure is installed; According to pre-determined scheme, carry out measurement and positioning installation; Coordinate after measurement and positioning obtains predeformation and adjusts according to construction simulation is as measurement and positioning coordinate.
The present invention has following beneficial effect:
1, can meet the requirement of different majors to steel construction precision, architectural appearance size is secure simultaneously.First by finite element software, simulate whole work progress, the result of calculation that simulation obtains according to work progress is back-calculated to obtain construction stage original state position shape, position shape after assurance has been constructed and the coordinate difference of design point position shape are within allowed band, this accuracy guarantee that is structure provides theory support, is later stage structure manufacture and the construction and installation work of laying a good groundwork simultaneously; Secondly, factory's in-depth can directly be carried out modeling according to model after predeformation and publishes picture, and member blanking is made precision and guaranteed; Finally, during on-the-spot installation, measurement and positioning can, according to model coordinate after predeformation as beasurement base, not need on-the-spot people for carrying out arch camber operation.
2, alleviate the initial imperfection of structure, guarantee structural safety; Most of space large-span structure is the flexible structure such as net shell especially, and under load action, deformation values is larger; If do not adopt the means of predeformation, structure has an initial imperfection and exists, and easily causes total unstability, and structural-load-carrying capacity can not get sufficient embodiment, when serious, can lead to security incident.Adopt after predeformation means, can as much as possible alleviate the impact that this defect is brought.
3, making, simple installation, total has just been considered the predeformation adjustment of structure in in-depth modeling process, therefore the manuscript blanking of directly providing according to in-depth when produce in factory is made, just can; During on-the-spot installation, only need to carry out measurement and positioning with reference to model coordinate after predeformation, do not need artificially to go again arch camber operation, conveniently save trouble.
Embodiment
Preferred embodiments of the present invention is a large scale business synthesis canopy of the heavens steel construction, its structural system is space single-layer lattice shell structure, architectural image is more irregular, exactly like a fish, length direction overall size is 174m, Width is of a size of 78m, and the relative grade absolute altitude of net shell peak is 27.2m.Total is comprised of vertical support member and roofing net shell two parts, and the member section of employing is pipe, and all member materials are Q345B.This engineering adopts the method for setting up full hall scaffold to construct.
These large scale business synthesis canopy of the heavens steel construction predeformation concrete steps are as follows:
The first step, utilizes node coordinate value and the rod member specification that steel construction drawing provides to form a preliminary computation model, and model is checked; In conjunction with support style, edge-restraint condition is set again.
Second step, according to structural design explanation or code requirement, considers load case when predeformation is calculated.This engineering roofing adopts ETFE membrane structure, and cornice position arranges gutter, and cornice periphery is decorated with aluminum veneer.When predeformation is calculated, in conjunction with roofing way and building function, only consider dead load effect, the load case of consideration:
Load case (COMB): 1.0 * G
1k+ 1.0 * G
2k+ 1.0 * G
3k+ 1.0 * G
4k
Wherein: G
1k---latticed shell structure deadweight
G
2k---the deadweight of ETFE film
G
3k---the deadweight of membrane structure web member
G
4k---cornice and the deadweight of aluminium bound edge
The 3rd step, in conjunction with arrangement and method for construction, determines computational analysis method; Because this engineering adopts full hall scaffold method, construct, net shell lower support point is comparatively intensive, and in whole installation process, the distortion of each node of net shell is very little, can not do to consider; Therefore when computational analysis, steel construction can be simulated by one-shot forming state, and analysis step is no longer set, the result that this analytical approach obtains can exert an influence to predeformation precision hardly.
The 4th step, utilize finite element software to calculate the deformation values of three directions of corresponding load case lower node, all column joints deformation values are exported in conventional data processor, its opposite sign is added on corresponding node coordinate, obtain the model coordinate after predeformation one time.According to this coordinate, set up the model after predeformation is adjusted.
Any point P on net shell, if:
Coordinate under initial designs state is: P(x, y, z)
Column joints deformation value under corresponding load case effect is: δ
0(u
0, v
0, ω
0)
, through a predeformation, adjusting recoil is designated as: P
1=-δ
0+ P, i.e. P
1-coordinate is (x-u
0, y-v
0, z-ω
0).
The 5th step, imports to the model after a predeformation adjustment in software for calculation, applies with first and second and walks identical boundary condition and load case, checks; The predeformation value that the deformation values that obtains of checking computations and the 4th step obtain is carried out difference comparative analysis, judges that difference is whether within allowed band.
In conjunction with the 4th step, further illustrate, utilize predeformation after model carry out work progress sunykatuib analysis, obtain:
P
1deformation values is: δ
1(u
1, v
1, ω
1)
Δ
1(m
1, n
1, k
1), Δ
1=δ
1-δ
0be both differences, wherein m
1=u
1-u
0, n
1=v
1-v
0, k
1=ω
1-ω
0.
The 6th step, through comparing, the coordinate difference that the 5th step obtains is within allowed band, and the deformation values that four-step calculation obtains, by can be used as predeformation adjusted value after its opposite sign, then carries out Deepen Design according to the model after predeformation adjustment, and blanking is made.
(1) if P point difference DELTA
1(m
1, n
1, k
1) within error allowed band:
After predeformation, model node coordinate is: P
1(x-u
0, y-v
0, z-ω
0)
(2) if P point difference DELTA
1(m
1, n
1, k
1) exceed error allowed band, by δ
1(u
1, v
1, ω
1) the opposite sign P(x that is added to, y, z) upper, obtain secondary predeformation posterior nodal point coordinate P
2(x-u
1, y-v
1, z-ω
1), then judge difference DELTA
2(m
2, n
2, k
2) whether meet the demands; If not, proceed iterative computation, until difference DELTA
i(m
i, n
i, k
i) meet accuracy requirement till, after the predeformation finally obtaining, model node coordinate is P
i(x-u
i-1, y-v
i-1, z-ω
i-1), wherein: m
i=u
i-u
i-1, n
i=v
i-v
i-1, k
i=ω
i-ω
i-1.
The 7th step, structure is installed; According to pre-determined scheme, carry out measurement and positioning installation; The model coordinate that measurement and positioning obtains after according to final predeformation adjustment is as construction survey coordinate.
Above-described embodiment non-limiting invention, suitable variation or modification that any person of an ordinary skill in the technical field does it, all should be considered as not departing from patent category of the present invention.
Claims (1)
1. space, greatly across a special-shaped steel structure fabrication and installation predeformation method, is characterized in that: concrete steps are as follows:
The first step, sets up computation model by steel construction drawing;
Second step, according to building, the requirement of structure to predeformation, determines load case when predeformation is calculated;
The 3rd step, adopts finite element software to carry out construction simulation analysis, obtains the 3 D deformation value of each node of steel construction;
The 4th step, the deformation values of each node that " the 3rd step " calculated, utilize conventional data processing tools that deformation values opposite sign is added under initial designs state on corresponding node coordinate, thereby obtain the coordinate of model after a predeformation, according to this coordinate, set up the three-dimensional model after predeformation one time;
The 5th step, column joints deformation difference is extracted, and compares analysis; Utilize the model after predeformation one time, import in software for calculation, carry out above-mentioned " second step " and " the 3rd step " operation, check; The deformation values and the predeformation value that after construction simulation is completed, obtain are carried out difference calculating, and difference is done to statistics comparative analysis;
The 6th step, if the difference that " the 5th step " obtains is within allowed band, the deformation values that " the 3rd step " calculates is predeformation adjusted value by its opposite sign, and the model after a predeformation that then can obtain according to " the 4th step " carries out Deepen Design, and blanking is made; Through comparing, if the difference result obtaining has exceeded allowed band, in the computation model that needs this difference to be added to after predeformation for the first time, carry out again " the 5th step " operation, until simulation obtains the structural form of construction after finishing and the coordinate difference between initial designs form within allowed band; Thereby be met the model after the predeformation of accuracy requirement, then carry out Deepen Design, blanking is made;
The 7th step, structure is installed; According to pre-determined scheme, carry out measurement and positioning installation; Coordinate after measurement and positioning obtains predeformation and adjusts according to construction simulation is as measurement and positioning coordinate.
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| CN109766661A (en) * | 2019-01-28 | 2019-05-17 | 中国矿业大学 | A kind of special-shaped thin wall building structure strengthening method |
| CN110674549A (en) * | 2019-09-24 | 2020-01-10 | 中国水利水电第十四工程局有限公司 | Optimization method of tunnel temporary support dismantling scheme |
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| CN111677295A (en) * | 2020-05-29 | 2020-09-18 | 中冶(上海)钢结构科技有限公司 | Steel structure assembling arching correction method for steel structure integral lifting construction method |
| CN112411759A (en) * | 2020-10-28 | 2021-02-26 | 上海二十冶建设有限公司 | Non-full-cloth support large-span steel structure high-altitude bulk accurate assembly method |
| CN112380602A (en) * | 2020-11-13 | 2021-02-19 | 上海二十冶建设有限公司 | High-precision construction method for spatial curved surface reticulated shell in limited environment |
| CN112380602B (en) * | 2020-11-13 | 2023-05-30 | 上海二十冶建设有限公司 | High-precision construction method for space curved surface reticulated shell in limited environment |
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