CN109060514B - Device for keeping extended steel plate from destabilizing in pressed steel member test and implementation method thereof - Google Patents
Device for keeping extended steel plate from destabilizing in pressed steel member test and implementation method thereof Download PDFInfo
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- CN109060514B CN109060514B CN201811280566.9A CN201811280566A CN109060514B CN 109060514 B CN109060514 B CN 109060514B CN 201811280566 A CN201811280566 A CN 201811280566A CN 109060514 B CN109060514 B CN 109060514B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 132
- 239000010959 steel Substances 0.000 title claims abstract description 132
- 238000012360 testing method Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000000368 destabilizing effect Effects 0.000 title description 2
- -1 polytetrafluoroethylene Polymers 0.000 claims description 11
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 11
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 11
- 238000010276 construction Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 3
- 230000000149 penetrating effect Effects 0.000 abstract description 3
- 238000013112 stability test Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a device for keeping a stretched steel plate from being unstable firstly in a pressed steel member test and an implementation method thereof, wherein the device for keeping the stretched steel plate from being unstable firstly in the pressed steel member test comprises cantilever steel plates extending towards two sides, each cantilever steel plate comprises a pair of temporary stiffening plates positioned at two sides of a steel member test piece, the side parts of a cantilever steel plate clamp are clamped between the pair of temporary stiffening plates at the same side, the temporary stiffening plates are arranged in parallel with the cantilever steel plates, the pair of temporary stiffening plates at the same side are connected through bolts penetrating through the two temporary stiffening plates, and the bolts are not contacted with the cantilever steel plates. The device is reasonable in stress, scientific in design, excellent in durability and capable of being recycled.
Description
Technical Field
The invention relates to a device for keeping a stretched steel plate from instable in a pressed steel member test and an implementation method thereof.
Background
In steel structures, many test pieces have the form of protruding steel plates. Such as box steel structures, i-section steel, stiffening plates with closed ribs or stiffening plates with open ribs. When the steel structures are subjected to a pressed local stability test, the extending steel plates are often subjected to instability first, the instability performance of other plates other than the extending steel plates cannot be obtained, and in order to ensure that the extending steel plates are not subjected to instability first, a shorter extending steel plate test piece structure is often adopted for the test. The test piece loses symmetry due to the fact that the shorter extending steel plate is adopted, residual stress of the component changes, redundant variables are introduced for the test, and test analysis is not facilitated. It can be seen that restraining the extended steel plate by a proper method is the key point of research in order to ensure that the extended steel plate does not destabilize first.
Disclosure of Invention
The invention improves the problems, namely the technical problem to be solved by the invention is that when the existing steel structure with the cantilever steel plate is subjected to a stability test, the extending steel plate is often unstable, and the instability performance of other plate members other than the extending steel plate cannot be obtained.
The specific embodiments of the invention are: the device for preventing the steel plate from being unstable in the test of the pressed steel member comprises cantilever steel plates extending to two sides, wherein the cantilever steel plates are arranged on two sides of a steel member test piece respectively, the side parts of the cantilever steel plate clamps are clamped between a pair of temporary stiffening plates on the same side, the temporary stiffening plates are arranged in parallel with the cantilever steel plates, and the pair of temporary stiffening plates on the same side are connected with the cantilever steel plates through bolts penetrating through the two temporary stiffening plates and the bolts are not contacted with the cantilever steel plates.
Furthermore, a polytetrafluoroethylene plate is arranged between one side, facing the cantilever steel plate, of the temporary stiffening plate and the cantilever steel plate, so that friction force between the temporary stiffening plate and the cantilever steel plate is reduced.
Further, a rubber backing plate positioned on the outer side of the cantilever steel plate is clamped between the pair of temporary stiffening plate pieces on the same side, so that the temporary stiffening plate pieces on the same side are prevented from warping when being fixed by bolts.
Further, the thickness of the rubber backing plate is consistent with that of the cantilever steel plate.
Furthermore, the transverse length of the overlapped part of the temporary stiffening plate and the cantilever steel plate is 2-6cm, and the thickness of the polytetrafluoroethylene plate is 0.5 mm-3 mm.
Furthermore, the nominal diameter of the bolt is M16-M27.
Further, the temporary stiffening plate extends with side plates perpendicular to the temporary stiffening plate.
The invention also comprises a construction method for keeping the extending steel plate from instable in the pressed steel member test, which is characterized by comprising the following steps:
(1) Manufacturing a temporary stiffening plate: the surface of the temporary stiffening plate should be leveled to ensure that the surface is smooth and does not bulge. Pasting polytetrafluoroethylene sheets at the overlapped parts of the temporary stiffening plate and the cantilever steel plates of the pressed steel members, punching a plurality of bolt holes in the longitudinal direction of each temporary stiffening plate, determining the size of the holes according to the sizes of the bolts, and arranging strain gauges on one side of the temporary stiffening plate to monitor the angle steel so as not to share excessive force;
(2) Placing a restraint device: two temporary stiffening plates are arranged on each side of the cantilever steel plate of the pressed steel member, the temporary stiffening plates are kept parallel and sandwich the cantilever steel plate extending out of the pressed steel member, and meanwhile, rubber backing plates are placed at gaps of the two temporary stiffening plates on the same side; in order to ensure that the temporary stiffening plate does not exceed the pressed steel member test piece in the length direction so as not to influence the subsequent loading process, the upper and lower ends of the temporary stiffening plate and the upper and lower ends of the cantilever steel plate are reserved with a distance of 5-7 cm; the bolts are used for fixing the two temporary stiffening plates on the same side, and the bolts cannot contact the test piece, so that force transmission is avoided;
(3) And (3) test piece installation: after the restraint device is fixed, the test piece with the device is placed on a loading table to prepare for test loading.
Further, the loading table is provided with loading plates positioned above and below the steel member, the loading plates are fixedly connected with end plates, slotted holes conforming to the section outline of the steel member are formed in the end plates, two ends of the steel member are inserted into the slotted holes of the end plates to simulate the condition that two sides of the steel member are simply supported, the loading plates are rectangular steel plates and are used for fixing the end plates and transmitting loads when the steel member is loaded, and the end plates are fixedly connected with the loading plates.
Furthermore, when the bolts fix the two temporary stiffening plates on the same side, the bolts need to follow the sequence of the middle part and the two sides, and need to be fastened in stages.
Compared with the prior art, the invention has the following beneficial effects: the device for keeping the extending steel plate from instable in the pressed steel member test can not only restrict the extending cantilever part steel plate, but also ensure that redundant variables are not introduced to the local stability test. The device is reasonable in stress, scientific in design, excellent in durability, capable of being recycled and in line with the development concept of green and environment protection. Meanwhile, the device is rapid and simple to install and has a good application prospect.
Drawings
FIG. 1 is a schematic view of a temporary stiffening plate according to the present invention.
FIG. 2 is a schematic view of the structure of the temporary stiffening plate and steel member of the present invention.
FIG. 3 is a schematic view of the structure of the pressed steel member of the invention in combination with a load plate in a test.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
As shown in fig. 1 to 3, the device for keeping the extended steel plate from being unstable in the test of the pressed steel member, the steel member 10 comprises cantilever steel plates 110 extending towards two sides, each cantilever steel plate comprises a pair of temporary stiffening plates 20 arranged at two sides of the steel member test piece, the side parts of the cantilever steel plate clamp are clamped between the pair of temporary stiffening plates 20 at the same side, the temporary stiffening plates are arranged in parallel with the cantilever steel plates, the pair of temporary stiffening plates at the same side are connected by high-strength bolts 201 penetrating through the two temporary stiffening plates, and the high-strength bolts are not contacted with the cantilever steel plates 110.
In this embodiment, a polytetrafluoroethylene plate 30 is disposed between the cantilever steel plate and one side of the temporary stiffening plate 20 facing the cantilever steel plate, so as to reduce friction between the temporary stiffening plate and the cantilever steel plate, and the polytetrafluoroethylene plate 30 is glued to the temporary stiffening plate 20. The polytetrafluoroethylene sheet 30 is positioned at the overlap of the temporary stiffening plate 20 and the cantilever steel sheet.
In this embodiment, a rubber pad 40 located outside the cantilever steel plate is further sandwiched between the pair of temporary stiffening plates on the same side, that is, the rubber pad is placed at the gap between the temporary stiffening plates, so as to ensure that the temporary stiffening plates do not warp during the process of reinforcing the pair of temporary stiffening plates 20 on the same side by high-strength bolts, and the thickness of the rubber pad 40 is consistent with that of the cantilever steel plate.
In the embodiment, the transverse length of the overlapped part of the temporary stiffening plate and the cantilever steel plate is 2-6cm, the thickness of the polytetrafluoroethylene plate is 0.5 mm-3 mm, and the nominal diameter of the high-strength bolt is M16-M27.
In this embodiment, the temporary stiffening plate extends with side plates perpendicular to the temporary stiffening plate to form a T-shape or a crutch shape, and of course, in practical design, the temporary stiffening plate may be angle steel, a stiffening plate with plate ribs or T-ribs.
The concrete construction method comprises the following steps:
(1) Manufacturing a temporary stiffening plate: the surface of the temporary stiffening plate should be leveled to ensure that the surface is smooth and does not bulge. Pasting polytetrafluoroethylene sheets at the overlapped parts of the temporary stiffening plate and the cantilever steel plates of the pressed steel members, punching a plurality of bolt holes in the longitudinal direction of each temporary stiffening plate, determining the size of the holes according to the sizes of the bolts, and arranging strain gauges on one side of the temporary stiffening plate to monitor the angle steel so as not to share excessive force;
(2) Placing a restraint device: two temporary stiffening plates are arranged on each side of the cantilever steel plate of the pressed steel member, the temporary stiffening plates are kept parallel and sandwich the cantilever steel plate extending out of the pressed steel member, and meanwhile, rubber backing plates are placed at gaps of the two temporary stiffening plates on the same side; in order to ensure that the temporary stiffening plate does not exceed the pressed steel member test piece in the length direction so as not to influence the subsequent loading process, the upper and lower ends of the temporary stiffening plate and the upper and lower ends of the cantilever steel plate are reserved with a distance of 5-7 cm; the bolts are used for fixing the two temporary stiffening plates on the same side, the bolts cannot contact the test piece, so that force transmission is avoided, and when the bolts fix the two temporary stiffening plates on the same side, the bolts are fastened in a sequence of the middle and the two sides, and the bolts are fastened in stages;
(3) And (3) test piece installation: after the restraint device is fixed, the test piece with the device is placed on a loading table to prepare for test loading.
In the experiment, the loading table of the test device is provided with loading plates 50 positioned above and below the steel member, the loading plates are fixedly connected with end plates 60, the end plates 60 are provided with slotted holes 610 which are consistent with the section outline of the steel member, two ends of the steel member are inserted into the slotted holes of the end plates to simulate the condition of simple support of two sides of the steel member, the loading plates 50 are rectangular steel plates and are used for fixing the end plates and transmitting load when the steel member is loaded, and the end plates are fixedly connected with the loading plates 50 through locking bolts 620.
If the invention discloses or relates to components or structures fixedly connected with each other, then unless otherwise stated, the fixed connection is understood as: detachably fixed connection (e.g. using bolts or screws) can also be understood as: the non-detachable fixed connection (e.g. riveting, welding), of course, the mutual fixed connection may also be replaced by an integral structure (e.g. integrally formed using a casting process) (except for obviously being unable to use an integral forming process).
In addition, terms used in any of the above-described aspects of the present disclosure to express positional relationship or shape have meanings including a state or shape similar to, similar to or approaching thereto unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components, or can be manufactured by an integral forming process.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical scheme of the present invention and are not limiting; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.
Claims (4)
1. The construction method for keeping the extending steel plate from being unstable in the test of the pressed steel member is characterized by forming a device for keeping the extending steel plate from being unstable in the test of the pressed steel member, wherein the steel member comprises cantilever steel plates extending towards two sides;
a polytetrafluoroethylene plate is arranged between one side, facing the cantilever steel plate, of the temporary stiffening plate and the cantilever steel plate so as to reduce friction force between the temporary stiffening plate and the cantilever steel plate;
A rubber backing plate positioned at the outer side of the cantilever steel plate is clamped between a pair of temporary stiffening plate pieces at the same side, so that the temporary stiffening plate pieces at the same side are prevented from warping when being fixed by bolts;
The thickness of the rubber backing plate is consistent with the thickness of the cantilever steel plate;
the transverse length of the overlapped part of the temporary stiffening plate and the cantilever steel plate is 2-6cm, and the thickness of the polytetrafluoroethylene plate is 0.5 mm-3 mm;
the side parts of the temporary stiffening plate extend to be perpendicular to the side plates of the temporary stiffening plate;
the method specifically comprises the following steps:
(1) Manufacturing a temporary stiffening plate: the surface of the temporary stiffening plate should be flattened to ensure that the surface is smooth and no bulge occurs;
Pasting polytetrafluoroethylene sheets at the overlapped parts of the temporary stiffening plate and the cantilever steel plates of the pressed steel members, punching a plurality of bolt holes in the longitudinal direction of each temporary stiffening plate, determining the size of the holes according to the sizes of the bolts, and arranging strain gauges on one side of the temporary stiffening plate to monitor the angle steel so as not to share excessive force;
(2) Placing a restraint device: two temporary stiffening plates are arranged on each side of the cantilever steel plate of the pressed steel member, the temporary stiffening plates are kept parallel and sandwich the cantilever steel plate extending out of the pressed steel member, and meanwhile, rubber backing plates are placed at gaps of the two temporary stiffening plates on the same side; in order to ensure that the temporary stiffening plate does not exceed the pressed steel member test piece in the length direction so as not to influence the subsequent loading process, the upper and lower ends of the temporary stiffening plate and the upper and lower ends of the cantilever steel plate are reserved with a distance of 5-7 cm; the bolts are used for fixing the two temporary stiffening plates on the same side, and the bolts cannot contact the test piece, so that force transmission is avoided;
(3) And (3) test piece installation: after the restraint device is fixed, the test piece with the device is placed on a loading table to prepare for test loading.
2. The construction method for keeping the extending steel plate from being unstable in the test of the pressed steel member according to claim 1, wherein the loading table is provided with loading plates positioned above and below the steel member, the loading plates are fixedly connected with end plates, the end plates are provided with slotted holes which are in accordance with the section outline of the steel member, the two ends of the steel member are inserted into the slotted holes of the end plates to simulate the condition that the two sides of the steel member are simply supported, the loading plates are rectangular steel plates and are used for fixing the end plates and transmitting load when the steel member is loaded, and the end plates and the loading plates are fixedly connected.
3. The method of claim 1, wherein the bolts are used to fasten two temporary stiffening plates on the same side in a sequence of first middle and second sides and are used to fasten the two temporary stiffening plates in stages.
4. The construction method for keeping the extended steel plate from being unstable in the test of the pressed steel member according to claim 1, wherein the nominal diameter of the bolt is M16-M27.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811280566.9A CN109060514B (en) | 2018-10-30 | 2018-10-30 | Device for keeping extended steel plate from destabilizing in pressed steel member test and implementation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811280566.9A CN109060514B (en) | 2018-10-30 | 2018-10-30 | Device for keeping extended steel plate from destabilizing in pressed steel member test and implementation method thereof |
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| Publication Number | Publication Date |
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| CN109060514A CN109060514A (en) | 2018-12-21 |
| CN109060514B true CN109060514B (en) | 2024-05-17 |
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| CN109060514A (en) | 2018-12-21 |
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