CN203037233U - Device for continuously measuring local geometric initial imperfections of structural member - Google Patents
Device for continuously measuring local geometric initial imperfections of structural member Download PDFInfo
- Publication number
- CN203037233U CN203037233U CN 201220712456 CN201220712456U CN203037233U CN 203037233 U CN203037233 U CN 203037233U CN 201220712456 CN201220712456 CN 201220712456 CN 201220712456 U CN201220712456 U CN 201220712456U CN 203037233 U CN203037233 U CN 203037233U
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- China
- Prior art keywords
- stepper motor
- guide rail
- structural member
- local geometric
- displacement transducer
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Abstract
The utility model belongs to the technical field of steel structures of structural engineering, and especially relates to a device for continuously measuring local geometric initial imperfections of a structural member. A stepper motor rail is fixed on the structural member which is flatly placed. A guide rail slider is arranged on the stepper motor rail. One end of the stepper motor rail is connected with a stepping motor. Through a magnetic seat with an adjustable guide bar, a displacement sensor and the guide rail slider are fixedly connected. The displacement sensor is connected with a data acquisition system. According to the utility model, used measuring device and equipment have the advantages of simple operation and high measuring accuracy; and measured local geometric initial imperfection results of the structural member can be popularized and applied to the stability experimental research and the calculation analysis of the structural member.
Description
Technical field
The utility model belongs to Structural Engineering steel construction technical field, relates in particular to the device of how much initial imperfections of a kind of continuous quantity geodesic structure component partial.
Background technology
In the course of receiving of Structural Engineering, the dimensional discrepancy of structural elements and defect amplitudes must satisfy the requirement of corresponding construction quality acceptance specification.In the structural steelwork technical field, the local geometric initial imperfection of member is a very important acceptance index, directly influence bearing capacity and the distortion of member and structure, and the part of member stable, local-whole relevant stability test in, the local geometric initial imperfection of plate is unusual significant effects factor.Because the influence of the out-of-flatness of plate itself and heat input in the steel construction welding process, after the steel structure member moulding, each forms plate can exist to a certain degree local crowning or depression, " code for acceptance of construction quality of steel structures " (GB 50205) have proposed clear and definite requirement to this, and the method for inspection of ruler and clearance gauge is adopted in suggestion.But there is certain uncertainty in this method in actual mechanical process, often is difficult to record accurate local geometric initial imperfection numerical value.Adopt the measuring method of ruler and clearance gauge can inevitably be subjected to the flatness influence of ruler itself, and in the measurement process, need ruler be abutted in component surface by external force, can produce added influence to the ruler flatness; Simultaneously the width at clearance gauge tip has determined that the measuring point zone is bigger than normal, each steel plate thickness extreme difference of clearance gauge and select the artificial subjective uncertainty of different extreme difference steel discs can cause the out of true of measurement result.In addition, adopt three-coordinate measuring machine accurately to measure the coordinate of each point on the member, the local geometric initial imperfection that can convert and draw member section, but be subjected to the restriction of instrument self, this method is only applicable to size and the very little member of weight, and requires very high to the member cleanliness, the equipment complexity, operating environment requires high, and costly, is not suitable for carrying out how much initial imperfections of in enormous quantities, large-sized steel structure member and measures.And adopting the cost of comparatively advanced three-dimensional imaging scanning technique too high, practicality is relatively poor.Therefore, need simplicity of design easily row, local geometric initial imperfection measuring method accurately and reliably, in order to satisfy the demand that structural elements is checked and accepted and the steel structure member stability is tested.
Summary of the invention
Measure not easy to operately at present steel structure member local geometric initial imperfection, the problem that measurement out of true or practicality are relatively poor the utility model proposes the device of how much initial imperfections of a kind of continuous quantity geodesic structure component partial.
The technical scheme that this device adopts is:
The stepper motor guide rail is fixed on the structural elements of shelving that lies low; Stepper motor guide rail upper mounting rail slide block, an end of stepper motor guide rail is connected with stepper motor; The magnetic support that has adjustable guide bar is connected and fixed displacement transducer and guide rail slide block; Displacement transducer is connected with data acquisition system (DAS).
Described displacement transducer is digital displacement sensor.
The at the uniform velocity sliding velocity of described displacement transducer is less than 2mm/s, the influence that brings with the sliding friction of eliminating with component surface.
The beneficial effects of the utility model are:
(1) can realize continuous automatic measurement to component partial how much initial imperfections, and the automatic collection of realization data, and draw continuous defective modality curves, and can directly reflect the direction (convex or concave) of local geometric initial imperfection from curve shape.
(2) measuring accuracy is higher.If adopt the integrally bending flatness be ± guide rail of 0.05mm, the precision of data acquisition system (DAS) be ± 0.01mm, and the measurement result global error and adopts the method precision control of ruler and clearance gauge relatively poor in ± 0.06mm scope, and global error is controlled and is difficult to realization.
(3) regulate the elongation indentation amount that the magnetic support guide rod can be adjusted displacement transducer, can realize to I-shaped cross-section web etc. not the defective at easy-operating position measure.
(4) operation is simple for the equipment that adopts, and site condition is not had specific (special) requirements, member lie low shelve be fixed on the place after, guide rail is directly fixed on component surface and gets final product.
Description of drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the typical local geometric initial imperfection distributional pattern synoptic diagram in certain cross section on the welding box-shaped steel structure member;
Fig. 3 is the defective modality curves example of the actual components upper section seamed edge that records by the utility model;
Fig. 4 is to adopting actual measurement defective modality curves of the present utility model to carry out the accurate modality curves of the revised member section local geometric of end points initial imperfection.
Number in the figure:
The 1-structural elements; 2-stepper motor guide rail; The 3-displacement transducer; The 4-data acquisition system (DAS); The 5-magnetic support; 6-guide rail slide block; The 7-stepper motor; The 8-adjustable guide bar.
Embodiment
The utility model provides the device of how much initial imperfections of a kind of continuous quantity geodesic structure component partial, below in conjunction with the drawings and specific embodiments the utility model is described further.
The structure of this device is seen Fig. 1, and structural elements 1 horizontal fixed is positioned on the ground, and stepper motor guide rail 2 is fixed on the structural elements of shelving 1 that lies low, and makes its defectoscopy cross section with structural elements 1 parallel; Stepper motor guide rail 2 upper mounting rail slide blocks 6, an end of stepper motor guide rail 2 is connected with stepper motor 7; The magnetic support 5 that has adjustable guide bar 8 is connected and fixed displacement transducer 3 and guide rail slide block 6, and it is vertical with structural elements 1 surface to adjust displacement transducer 3, and the starting point in measurement cross section overlaps on the pointer that makes displacement transducer 3 and the structural elements 1; Displacement transducer 3 is connected with data acquisition system (DAS) 4.
Data acquisition system 4 is made zero after the initialization, start stepper motor 7, control guide rail slide block 6 is along set direction operation, at the uniform velocity slowly slide on the cross section by magnetic support 5 related displacement transducers 3, data acquisition system (DAS) 4 can collect the real-time reading of digital displacement sensor 3 simultaneously, and measured data are depicted as continuous change curve.According to the actual measurement requirements of one's work, xsect that can the selected member diverse location measures.
Fig. 2 is the local geometric initial imperfection exemplary distribution form signal in a certain cross section on the typical welding box section steel structure member, and the local geometric initial imperfection amplitude of four seamed edges is respectively w
1, w
2, w
3And w
4, the defect amplitudes in this cross section is:
Adopt this method to measure, seamed edge with a length of side 350mm on the cross section is example, according to data acquisition system (DAS) 4 recorded data, can draw out this cross section local and initial defective modality curves as shown in Figure 3, wherein curve a is the seamed edge defective modality curves of actual measurement.Because on a seamed edge of member particular cross section, its local geometric initial imperfection is that middle each point is with respect to the convex or concave amplitude of seamed edge end two angle points, curve a still need carry out the end points correction, therefore obtain curve c after the initial imperfection modality curves a of measured seamed edge being deducted two angle point straight line b, this is the actual local geometric initial imperfection modality curves of member upper section seamed edge, as shown in Figure 4.Peak among the figure is to local geometric initial imperfection amplitude w that should seamed edge
1, and this defective form is spirogyrate as seen from the figure.In order to measure the local geometric initial imperfection shape information of member more fully, can select a plurality of particular cross section along the member length direction, as representative cross sections such as mid point, quartile, ends, the local geometric initial imperfection form that measures each cross section respectively distributes, and can get to measure the maximal value that obtains as the local geometric initial imperfection form amplitude of whole member.
Claims (3)
1. the device of how much initial imperfections of a continuous quantity geodesic structure component partial is characterized in that stepper motor guide rail (2) is fixed on the structural elements of shelving (1) that lies low; Stepper motor guide rail (2) upper mounting rail slide block (6), an end of stepper motor guide rail (2) is connected with stepper motor (7); The magnetic support (5) that has adjustable guide bar (8) is connected and fixed displacement transducer (3) and guide rail slide block (6); Displacement transducer (3) is connected with data acquisition system (DAS) (4).
2. the device of how much initial imperfections of a kind of continuous quantity geodesic structure component partial according to claim 1 is characterized in that described displacement transducer (3) is digital displacement sensor.
3. the method for how much initial imperfections of continuous quantity geodesic structure component partial according to claim 1 is characterized in that the at the uniform velocity sliding velocity of described displacement transducer (3) is less than 2mm/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220712456 CN203037233U (en) | 2012-12-20 | 2012-12-20 | Device for continuously measuring local geometric initial imperfections of structural member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220712456 CN203037233U (en) | 2012-12-20 | 2012-12-20 | Device for continuously measuring local geometric initial imperfections of structural member |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203037233U true CN203037233U (en) | 2013-07-03 |
Family
ID=48689347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220712456 Expired - Fee Related CN203037233U (en) | 2012-12-20 | 2012-12-20 | Device for continuously measuring local geometric initial imperfections of structural member |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203037233U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063172A (en) * | 2012-12-20 | 2013-04-24 | 清华大学 | Device capable of continuously measuring structure component partial geometric initial imperfection and method |
| CN108981572A (en) * | 2018-08-06 | 2018-12-11 | 华侨大学 | A kind of rectangular steel plates geometry initial imperfection measurement method |
-
2012
- 2012-12-20 CN CN 201220712456 patent/CN203037233U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063172A (en) * | 2012-12-20 | 2013-04-24 | 清华大学 | Device capable of continuously measuring structure component partial geometric initial imperfection and method |
| CN108981572A (en) * | 2018-08-06 | 2018-12-11 | 华侨大学 | A kind of rectangular steel plates geometry initial imperfection measurement method |
| CN108981572B (en) * | 2018-08-06 | 2020-09-04 | 华侨大学 | Method for measuring geometric initial defects of rectangular steel plate |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130703 Termination date: 20151220 |
|
| EXPY | Termination of patent right or utility model |