CN205157214U - Steel spatial grid structure safety evaluation and test system - Google Patents
Steel spatial grid structure safety evaluation and test system Download PDFInfo
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- CN205157214U CN205157214U CN201520885609.1U CN201520885609U CN205157214U CN 205157214 U CN205157214 U CN 205157214U CN 201520885609 U CN201520885609 U CN 201520885609U CN 205157214 U CN205157214 U CN 205157214U
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Abstract
The utility model relates to an automatic technical field of structural engineering, concretely relates to steel spatial grid structure safety evaluation and test system. The utility model aims to solve the technical problem that a steel spatial grid structure safety evaluation and test system is provided, this system can detect its bearing capacity and whether satisfy the designing requirement under the circumstances that does not influence the operation of steel mesh frame. The utility model discloses a stress and strain detecting element, amount of deflection detecting element and load loading unit. Stress and strain detecting element includes resistance strain gauge and the static state that links to each other with the resistance strain gauge collection appearance of meeting an emergency, and resistance strain gauge sets up on the stress measurement member on steel spatial grid structure. Amount of deflection detecting element includes the amount of deflection measurement station of other end setting on steel spatial grid structure of steel wire and the displacement sensor who links to each other with the one end of steel wire, steel wire. The load loading unit includes loading hanging flower basket and the loading heavy object to the loading hanging flower basket, and the one end of loading hanging flower basket is connected to on steel spatial grid structure's the load point.
Description
Technical field
The utility model relates to Structural Engineering technical field of automation, is specifically related to a kind of steel grid structure Security Testing system.
Background technology
Steel grid structure is by a lot of rod member by node, according to the Spacial Frame Structures of certain rule composition.Steel grid structure can be divided into flat plate framed structure and curved surface rack according to profile.Under normal circumstances, flat plate framed structure is called rack, and curved surface rack is called net shell.Latticed shell structure has the characteristic of member structure and shell structure concurrently, reasonable stress, covers span large, is a kind of quite by the space structure paid close attention to both at home and abroad, space structure with fastest developing speed since becoming half a century.Latticed shell structure has graceful architectural image, no matter is that architectural plane, profile and body can to designer with sufficient freedoms of creation.On architectural plane, various shape can be adapted to, as circle, rectangle, polygon, triangle, fan-shaped and various irregular plane; Architectural appearance aspect, can form multiple curved surface, and as sphere, elliptical area, paraboloid of revolution roofing, the various bodies of building obtain by the cutting of curved surface and combination; In structure, latticed shell structure reasonable stress, can realize larger span.Due to the variation of net shell curved surface, structural design personnel can make net shell uniform force by meticulous curved design.
Grid structure and latticed shell structure are Spacial Frame Structures, have three-dimensional loading characteristic, can bear the effect of all directions.Rod member in grid structure and latticed shell structure had both been stressed member, again supporting rod each other, and collaborative work, globality and good stability, space stiffness is large, effectively can bear the effect of non-symmetrical load, load and dynamic load, have good anti-seismic performance.Grid structure is compared with latticed shell structure, and its pedestal configurations is comparatively simple.And latticed shell structure is due to its structural shape, be stressedly more tending towards reasonable, and architectural appearance more attractive in appearance can be realized.The major defect of latticed shell structure is: the deviation of rod member and node physical dimension and internal force, resistance to overturning and the construction precision departed from net shell of curved surface affect comparatively large, bring certain difficulty to structural design and construction.For reducing latticed shell structure initial imperfection, the requirement on machining accuracy for rod member and node is higher, and difficulty of processing is large.In addition, when the rise of net shell is very large, add the interior construction spacing that roofing surface sum is unnecessary, increase the consumption of building materials and the energy, these problems seem more outstanding in large-span shell.Because steel grid structure can adapt to the buildings of different spans, Different Plane shape, different support conditions, difference in functionality needs, not only the industry of medium and small span and covil construction are applied to some extent, and are widely used in the buildings such as the gymnasium of middle large span, exhibition center, the great hall, cinema, station, hangar, factory building and warehouse.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of steel grid structure Security Testing system, and whether this system can detect its bearing capacity and meet design requirement when not affecting Elements of Space Grid Truss operation.
The technical solution of the utility model is:
A kind of steel grid structure Security Testing system, comprises ess-strain detecting unit, amount of deflection detecting unit and load loading unit.The static strain Acquisition Instrument that ess-strain detecting unit comprises resistance strain gage and is connected with resistance strain gage, resistance strain gage is arranged on the stress measurement rod member on steel grid structure.The displacement transducer that amount of deflection detecting unit comprises steel wire and is connected with one end of steel wire, the other end of steel wire is arranged on the amount of deflection measuring point on steel grid structure.Load loading unit comprises and loads hanging basket and be loaded into the weight loaded on hanging basket, on the stress measurement rod member that the one end loading hanging basket is connected to steel grid structure or amount of deflection measuring point.
Concrete, stress measurement rod member comprises lower floor's web member of steel grid structure, middle level web member and upper strata web member.
Concrete, amount of deflection measuring point is the backspin node of steel grid structure.
The beneficial effects of the utility model: whether the utility model utilizes ess-strain detecting unit, amount of deflection detecting unit and the load loading unit be arranged on Elements of Space Grid Truss to detect strain and the amount of deflection of Elements of Space Grid Truss, meet design requirement with the bearing capacity grasping steel construction.Use resistance strain gage and static strain Acquisition Instrument to detect the strain of Elements of Space Grid Truss, there is the fast and reliable advantage of detection architecture of detection speed.Use steel wire that the change in displacement of steel grid structure camber measuring point is transferred to the displacement transducer rest on the ground, design cost is cheap, and detection speed is fast, testing result is reliable.Stress measurement rod member of the present utility model enumerates lower floor's web member of steel grid structure, middle level web member and upper strata web member, can grasp the ess-strain situation of whole steel grid structure comprehensively.Amount of deflection measuring point of the present utility model is that in steel grid structure, amount of deflection changes maximum backspin node.The technical scheme of this selection amount of deflection measuring point significantly simplifies point layout on the one hand, changes the amount of deflection of maximum backspin node on the other hand, to realize the comprehensive control to whole Elements of Space Grid Truss amount of deflection by grasping amount of deflection.The utility model project organization is succinct, is applicable to the Security Testing of national all kinds of steel grid structure, has larger application and promotes space.
Accompanying drawing explanation
Fig. 1 is composition schematic diagram of the present utility model.
Fig. 2 is the stress-loads change curve map of stress measurement rod member I.
Fig. 3 is the stress-loads change curve map of stress measurement rod member II.
Fig. 4 is the stress-loads change curve map of stress measurement rod member III.
Fig. 5 is the stress-loads change curve map of stress measurement rod member IV.
Fig. 6 is the amount of deflection-load curve figure of amount of deflection measuring point 1.
Fig. 7 is the amount of deflection-load curve figure of amount of deflection measuring point 2.
In Fig. 2-7, square dotted line is theoretical value curve, and rhombus dotted line is measured value curve.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Embodiment is redly hold highway brocade Shandong charge station Elements of Space Grid Truss engineering, and the Elements of Space Grid Truss of embodiment is that bolted spherical node is just putting quadrangular pyramid steel grid structure, symmetrically widens, and version is measure-alike, long 47.1m, wide 14.6m.Rack steel pipe adopts ratio-frequency welded tube, and grade of steel is Q235B.Rack steel ball adopts the bolt sphere that in GB699, No. 45 steel are made, and rack sleeve adopts Q235 steel, and screw or pin adopt 40Cr steel.Figure 1 shows that the composition of the Security Testing system detecting embodiment steel grid structure, and detection signal flows to.
First, by Finite Element Analysis Design software midas, force analysis is carried out to the steel grid structure of embodiment, find out the larger rod member of internal force and be out of shape larger point, carrying out detection on this basis and layout.Secondly, design experiment load.Trial load is undertaken calculating and loading by the basic combination of dead load and live load, and calculating each load(ing) point loading gross weight according to drawing and " loading code for design of building structures " is 8KN.Again, load test load detecting.Adopt the mode of hierarchical loading when trial load loads, being divided into Pyatyi, is 20%, 40%, 60%, 80% and 100% respectively.Whole measuring point (comprising stress measurement rod member and amount of deflection measuring point) all carries out zero load reading before formal load test, later after each load or unload namely reading once, and structure position changing reach relatively stable after and reading is once again before entering next stage load.Whether the measuring point larger to structure position changing, every observation in 5 minutes once, reach relatively stable with observation structure displacement.Finally, data analysis is detected.By the analysis and arrangement to field experiment data, the amount of deflection of the strain and amount of deflection measuring point of choosing representational stress measurement rod member is analyzed, because the Elements of Space Grid Truss in embodiment has symmetry, and the stress measurement rod member of selection totally four, amount of deflection measuring point totally two, testing result is in table 1 ~ 3.
The maximum measured stress value of table 1 each stress measurement rod member and theoretical stress value summary sheet
Table 2 each amount of deflection measuring point measured value and theoretical value summary sheet
Table 3 each amount of deflection measuring point amount of deflection residual deformation summary sheet
Stress-loads change curve that Fig. 2 ~ 5 are stress measurement rod member I ~ IV.Shown in Fig. 2 ~ 5, the stress test value of each stress measurement rod member is all less than theoretical analysis value, far below the yield strength of material, and stress-load curve near linear, this illustrates that the internal force of the steel grid structure in embodiment is in linear elasticity, and surplus capacity is comparatively large, margin of safety is higher, meets use safety requirement.
This amount of deflection detects and adopts steel wire that the displacement of rack camber measuring point is caused ground displacement transducer, measures.For guaranteeing the accurate of image data, avoiding the impact of vibration on data of Elements of Space Grid Truss when loading as far as possible, during each collection, waiting until that data stabilization gathers later again.As shown in Fig. 6 ~ 7, deflection theory assay value and the experiment value of each amount of deflection measuring point are all comparatively identical, and substantially linearly change along with the applying of load, even if the amount of deflection of node is still less when being added to 100% of payload values, safety margin is high.
Utilize table 3 data to calculate, the amount of deflection residual deformation value of each amount of deflection measuring point is respectively 18.87% and 13.19% of maximal value, is all less than 20% of code requirement.
In sum, under design load, the strain of the crucial rod member of the steel grid structure in embodiment and the measured value at key point place all less, material is all in linear-elastic range, and margin of safety is higher, therefore, use under normal design condition, structure is in rigid state, meets safety requirements, and degree of safety is higher.
The above embodiment is only preferred embodiment of the present utility model, and is not the exhaustive of the feasible enforcement of the utility model.For persons skilled in the art, to any apparent change done by it under the prerequisite not deviating from the utility model principle and spirit, all should be contemplated as falling with within claims of the present utility model.
Claims (3)
1. a steel grid structure Security Testing system, is characterized in that it comprises ess-strain detecting unit, amount of deflection detecting unit and load loading unit; The static strain Acquisition Instrument that described ess-strain detecting unit comprises resistance strain gage and is connected with described resistance strain gage, described resistance strain gage is arranged on the stress measurement rod member on steel grid structure; The displacement transducer that described amount of deflection detecting unit comprises steel wire and is connected with one end of described steel wire, the other end of described steel wire is arranged on the amount of deflection measuring point on steel grid structure; Described load loading unit comprises and loads hanging basket and be loaded into the weight loaded on hanging basket, on the stress measurement rod member that one end of described loading hanging basket is connected to steel grid structure or amount of deflection measuring point.
2. a kind of steel grid structure Security Testing system according to claim 1, is characterized in that described stress measurement rod member comprises lower floor's web member of steel grid structure, middle level web member and upper strata web member.
3. a kind of steel grid structure Security Testing system according to claim 1, is characterized in that described amount of deflection measuring point is the backspin node of steel grid structure.
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| CN201520885609.1U CN205157214U (en) | 2015-11-09 | 2015-11-09 | Steel spatial grid structure safety evaluation and test system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106932160A (en) * | 2017-03-15 | 2017-07-07 | 上海建为历保科技股份有限公司 | Ancient building stress analysis method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106932160A (en) * | 2017-03-15 | 2017-07-07 | 上海建为历保科技股份有限公司 | Ancient building stress analysis method |
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