CN100363575C - Thin-wall open section steel with connection rod - Google Patents
Thin-wall open section steel with connection rod Download PDFInfo
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- CN100363575C CN100363575C CNB2005100498446A CN200510049844A CN100363575C CN 100363575 C CN100363575 C CN 100363575C CN B2005100498446 A CNB2005100498446 A CN B2005100498446A CN 200510049844 A CN200510049844 A CN 200510049844A CN 100363575 C CN100363575 C CN 100363575C
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Abstract
The present invention provides opening thin-wall section steel provided with connecting rods after structure treatment, particularly cold bent thin-wall edge rolling channel steel, which is provided with the distortional buckling critical load higher than that of the original section steel in the same model number in order to increase the loading ability of the section steel. Thus, the material performance is sufficiently used for obtaining economical and practical purposes. The present invention uses the technical scheme that the thin-wall opening section steel provided with connecting rods comprises a web board, wing edges and rolling edges. Connecting rods are arranged among openings, and both ends of each connecting rod are respectively connected with an upper and a lower rolling edge or an upper and a lower wing edges. The maximum space distance among the connecting rods is not longer than half of the length of the distortional buckling half wave of opening thin-wall section steel. Numerical calculation shows that after the technical scheme is used, the press bent distortional buckling load of the opening thin-wall section steel in the same model number can be generally increased by at least 20% to 30%. The loading ability of the section steel is increased, and the material performance is sufficiently used.
Description
Technical Field
The invention relates to a steel member commonly used in buildings, bridges and various equipment supports, in particular to cold-bending open thin-wall section steel.
Background
The steel yield in China exceeds the sum of America days, the world is the first in 9 continuous years, the application range of steel in China is increasingly expanded, and the quantity of the steel is increased day by day. Considering the improvement of the technical and economic indexes of the materials, the method is a necessary requirement for the increasing development and the more intense competition of the current market. Therefore, the application of the cold-formed thin-wall section steel in buildings, bridges and various equipment supports is increasingly wide, so that the material can be saved, the dead weight can be reduced, and the transportation and the installation are convenient, thereby reducing the comprehensive cost. The cold-bending thin-wall curled channel steel is most widely applied to actual engineering in cold-bending open thin-wall section steel.
Theoretical analysis and experimental research show that after the wall thickness of the cold-bending thin-wall curled channel steel reaches a certain degree, under the combined action of pressure, bending moment or both, local buckling or distortion buckling can occur, and the critical load of the buckling can be far smaller than that of an integral component, so that the performance of the material cannot be fully utilized. In engineering design, local buckling and distorted buckling are often avoided by limiting the wall thickness of an open thin-wall steel member, so that steel cannot be further saved.
Disclosure of Invention
In order to solve the problems that the cold-formed thin-wall curled channel steel has distortion and buckling, and the buckling critical load of the cold-formed thin-wall curled channel steel is possibly far smaller than the critical load of an integral component, so that the performance of the material cannot be fully utilized in the prior art, the invention provides the open thin-wall steel-cold-formed thin-wall curled channel steel provided with the connecting rod which is subjected to structural treatment, so that the open thin-wall steel-cold-formed thin-wall curled channel steel has larger distortion and buckling critical load than the original steel of the same type, the bearing capacity of the steel is improved, and the performance of the material is fully utilized to achieve the purposes of being more economical and applicable.
The technical scheme adopted by the invention is as follows:
an opening thin-wall section steel provided with a connecting rod comprises a web plate, flanges and turned edges, and is characterized in that the connecting rod is arranged between the openings of the section steel, and two ends of the connecting rod are respectively connected with the upper turned edge and the lower turned edge of the section steel or respectively connected with the upper flange and the lower flange of the section steel; the connecting mode of the connecting rod and the section steel is welding, anchoring, clamping or bonding;
the maximum distance between the connecting rods does not exceed one half of the distorted buckling half wavelength of the opening thin-wall section steel; distortion buckling half-wave length l of open thin-wall curled channel steel d Calculated according to the following formula:
wherein t is the wall thickness of the section steel, b is the width of the flange, d is the height of the curled edge, and h is the height of the web.
As a modification, the size of the connecting rod is determined according to the allowable slenderness ratio lambda of the pressed support is less than or equal to 200.
The spacing of the connecting rods can be evenly distributed or arranged according to specific conditions.
Numerical calculation analysis shows that after the technical scheme is adopted, the bending distortion buckling load of the open thin-walled steel with the same model can be generally increased by 20-30% or more; the bearing capacity of the section steel is improved, and the performance of the material is fully utilized.
Drawings
FIG. 1: schematic view of curled channel steel provided with connecting rod
FIG. 2: A-A section view
Reference numerals: web 1, flange 2, turn-up 3, connecting rod 4, anchor 5.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
As shown in figure 1, the open thin-wall section steel provided with the connecting rods comprises a web plate 1, a flange 2 and a curled edge 3, and the connecting rods 4 are arranged between the openings of the section steel.
Two ends of the connecting rod 4 are respectively connected with the upper and lower curled edges of the section steel; or two ends of the connecting rod 4 are respectively connected with the upper flange and the lower flange of the section steel.
The maximum distance between the connecting rods does not exceed half of the distorted buckling half wavelength of the open thin-wall section steel (can be equal to half of the half wavelength);
distortion buckling half-wave length l of open thin-wall curled channel steel d Can be calculated according to the following formula:
in the formula, t is the wall thickness of the channel steel, b is the width of the flange 2, d is the height of the turned edge 3, and h is the height of the web 1.
The connecting rod 4 can be made of metal or nonmetal material, and the section size is determined according to the condition that the allowable slenderness ratio lambda of the pressed support is less than or equal to 200, namely the requirement of the following formula is met
In which λ and l 1 Maximum slenderness ratio and length of the connecting rod, i min Is the smallest turning radius of the cross section of the connecting rod.
The connecting mode of the connecting rod and the upper flange and the lower flange is welding, anchoring, clamping, bonding or other simple and reliable connecting methods.
Example 1, as shown in fig. 2, an open thin-walled steel-rolled channel steel, a connecting rod 4, both ends of which are connected with upper and lower rolled edges by anchors 5, respectively. The height h =120mm of the web 1, the width b =90mm of the flange 2, the height d =15mm of the bead 3 and the wall thickness t =1.5mm are taken.
Calculating the half wavelength l of the deformed and bent section steel according to the formula (1) d =720mm. The connecting rod is made of steel plate strip with thickness t 1 Width b of =1.4mm 1 Length of =2mm 1 =80mm, the smallest radius of gyration of the cross section
In the formula A 1 And I 1，min Respectively the area and the minimum moment of inertia of the cross section of the steel plate strip.
Maximum slenderness ratio of steel plate strip connecting rod
The requirement of the formula (2) is met, and the section of the used connecting rod is proper.
The distances between the connecting rods 4 are S =720mm and 360mm (= l) respectively d /2), 180mm and 72mm. The finite element analysis result shows that after the connecting rod is arranged in the curled channel steel, the curled channel steel is divided by S = l d The bearing capacity is improved by 30-52% except for 720mm, see the table below.
TABLE 1 comparison of the bearing capacities of the front and rear crimping channel steels of the connecting rod under the action of eccentric pressure *
| Eccentricity of pressure e(mm) | Without connecting rod | Distance between connecting rods S＝l d ＝720mm | Distance between connecting rods S＝l d /2 ＝360mm | Distance between connecting rods S＝l d /4 ＝180mm | Distance between connecting rods S＝l d /10 ＝72mm |
| 5 | 65.8 | 65.8 | 85.3 | 86.0 | 86.0 |
| 15 | 49.9 | 49.9 | 76.0 | 76.5 | 76.5 |
| 25 | 40.5 | 40.5 | 60.0 | 60.2 | 60.5 |
| 30 | 36.8 | 36.8 | 54.5 | 54.7 | 55.3 |
| Pure bend | 2.2 | 2.2 | 3.3 | 3.3 | 3.3 |
* The unit of the bearing capacity is as follows: kN or kN · m.
Example 2, an open thin-walled steel, a connecting rod 4, both ends of which are connected to upper and lower flanges with anchors 5, respectively, is the same as example 1.
Example 3, an open thin-walled steel, connecting rod 4 with both ends welded to upper and lower flanges, respectively, was the same as example 1.
Example 4, an open thin-walled steel, in which both ends of a connecting rod 4 are welded to upper and lower flanges, respectively, is the same as in example 1.
Finally, it should also be noted that the above-mentioned list is only a specific embodiment of the invention. It is obvious that the invention is not limited to the above embodiments, but that many variations are possible.
The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The above-described embodiments of the invention are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims, and not by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (2)
1. An opening thin-wall section steel provided with connecting rods comprises a web plate (1), flanges (2) and turned edges (3), and is characterized in that the connecting rods (4) are arranged between the openings of the section steel, and two ends of each connecting rod (4) are respectively connected with the upper turned edge and the lower turned edge of the section steel or respectively connected with the upper flange and the lower flange of the section steel; the connecting mode of the connecting rod (4) and the section steel is welding, anchoring, clamping or bonding;
the maximum distance between the connecting rods does not exceed one half of the distorted buckling half wavelength of the opening thin-wall section steel; distortion buckling half-wave length l of open thin-wall curled channel steel d Calculated according to the following formula:
wherein t is the wall thickness of the section steel, b is the width of the flange (2), d is the height of the turned edge (3), and h is the height of the web (1).
2. The open thin-walled steel section provided with a connecting rod as claimed in claim 1, wherein the connecting rod is dimensioned in accordance with the allowable slenderness ratio λ ≦ 200 for the compression support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100498446A CN100363575C (en) | 2005-05-27 | 2005-05-27 | Thin-wall open section steel with connection rod |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100498446A CN100363575C (en) | 2005-05-27 | 2005-05-27 | Thin-wall open section steel with connection rod |
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| Publication Number | Publication Date |
|---|---|
| CN1702258A CN1702258A (en) | 2005-11-30 |
| CN100363575C true CN100363575C (en) | 2008-01-23 |
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| CNB2005100498446A Expired - Fee Related CN100363575C (en) | 2005-05-27 | 2005-05-27 | Thin-wall open section steel with connection rod |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102312483B (en) * | 2010-06-30 | 2013-12-25 | 谢英俊 | Square light steel member with reinforcement parts |
| CN103899041A (en) * | 2012-12-25 | 2014-07-02 | 上海钢之杰钢结构建筑有限公司 | Bending control part provided with crimped groove-shaped cross section and used for preventing distortion |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0370342A2 (en) * | 1988-11-25 | 1990-05-30 | Bayer Ag | Light weight constructional element |
| CN2527608Y (en) * | 2002-05-17 | 2002-12-25 | 胡战波 | Prestressed large span solid web steel girder structure system |
| CN1392314A (en) * | 2001-06-20 | 2003-01-22 | 新日本制铁株式会社 | Building assembling method using thin plate light steel |
| US6550211B2 (en) * | 1999-07-05 | 2003-04-22 | Recherche & Developpement Du Groupe Cockerill Sambre | Girder structure and method for producing such structures |
| US20040163356A1 (en) * | 2002-09-05 | 2004-08-26 | John Rice | Framing member having reinforced end |
| CN2683744Y (en) * | 2004-01-31 | 2005-03-09 | 西安长庆科技工程有限责任公司 | Small-sized quick-installed light steel structure house member |
-
2005
- 2005-05-27 CN CNB2005100498446A patent/CN100363575C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0370342A2 (en) * | 1988-11-25 | 1990-05-30 | Bayer Ag | Light weight constructional element |
| US6550211B2 (en) * | 1999-07-05 | 2003-04-22 | Recherche & Developpement Du Groupe Cockerill Sambre | Girder structure and method for producing such structures |
| CN1392314A (en) * | 2001-06-20 | 2003-01-22 | 新日本制铁株式会社 | Building assembling method using thin plate light steel |
| CN2527608Y (en) * | 2002-05-17 | 2002-12-25 | 胡战波 | Prestressed large span solid web steel girder structure system |
| US20040163356A1 (en) * | 2002-09-05 | 2004-08-26 | John Rice | Framing member having reinforced end |
| CN2683744Y (en) * | 2004-01-31 | 2005-03-09 | 西安长庆科技工程有限责任公司 | Small-sized quick-installed light steel structure house member |
Non-Patent Citations (1)
| Title |
|---|
| 卷边槽钢的局部相关屈曲和畸变屈曲. 陈绍蕃.建筑结构学报，第23卷第1期. 2002 * |
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| CN1702258A (en) | 2005-11-30 |
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| C14 | Grant of patent or utility model | ||
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| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Hangzhou East China Steel Manufacturing Co., Ltd. Assignor: Zhejiang University Contract fulfillment period: 2008.2.2 to 2013.2.1 contract change Contract record no.: 2009330002489 Denomination of invention: Thin-wall open section steel with connection rod Granted publication date: 20080123 License type: Exclusive license Record date: 20091015 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.2.2 TO 2013.2.1; CHANGE OF CONTRACT Name of requester: HANGZHOU HUADONG STEEL STUCTURE MANUFACTURING CO., Effective date: 20091015 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080123 Termination date: 20160527 |