CN110954404B - Buckling-restrained device and method suitable for plate-shaped test piece compression test - Google Patents
Buckling-restrained device and method suitable for plate-shaped test piece compression test Download PDFInfo
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- CN110954404B CN110954404B CN201911371090.4A CN201911371090A CN110954404B CN 110954404 B CN110954404 B CN 110954404B CN 201911371090 A CN201911371090 A CN 201911371090A CN 110954404 B CN110954404 B CN 110954404B
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- 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
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- 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
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Abstract
The invention discloses a buckling-restrained device suitable for a compression test of a plate-shaped test piece and a method thereof. The method is characterized in that: the channel steel is provided with the outward convex clamping groove and the inward concave clamping groove, so that a plurality of channel steels can be nested, and the channel steels are reinforced through the channel steel connecting bolt, so that the channel steel compression testing device is suitable for compression tests of plate-shaped test pieces with different lengths; the lower supporting leg is connected with the channel steel through a fastening bolt, and the bolt can move up and down along the sliding groove, so that the height of the whole anti-buckling device can be adjusted; the dial and the dial pointer are respectively located on the lower supporting leg and the channel steel, the adjusting height of the whole device can be displayed, and meanwhile, the four supporting legs can be guaranteed to be on the same height. The device can be suitable for compression tests of plate-shaped test pieces with different lengths, and has the characteristics of simple structure, convenience in operation and reusability.
Description
Technical Field
The invention belongs to the technical field of test equipment, relates to a loading test system, and particularly relates to a buckling-restrained device and a buckling-restrained method suitable for a plate-shaped test piece compression test.
Background
In the process of uniaxial compression of the plate-shaped test piece, the test piece to be tested is extremely easy to cause serious eccentric torsion due to no lateral support when being subjected to compression load, and stress deformation of the test piece is also easily limited due to over-constraint, so that the error of experimental data is large, and more accurate experimental data is difficult to obtain.
In 2015, li yun gui et al discloses a self-balancing vertical loading test system and a self-balancing vertical loading test method for buckling restrained braces (patent publication number: CN 105424483A), which can be applied to compression tests of plate-shaped test pieces with different lengths. However, the testing system is complex in structure and needs to be matched with a specific testing machine for use. Therefore, the anti-buckling device is convenient to mount, high in test efficiency, capable of vertically placing the test piece and free of being matched with a specific testing machine, and has important significance for the compression test of the plate-shaped test piece.
Disclosure of Invention
In order to overcome the main defects of the traditional compression test buckling-restrained device, the invention aims to provide the buckling-restrained device suitable for the compression test of the plate-shaped test piece and the method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the test device comprises channel steel, lower supporting legs, rubber caps of the lower supporting legs, channel steel connecting bolts, dial pointers, channel steel outer convex clamping grooves, channel steel inner concave clamping grooves, channel steel connecting threaded holes, fastening bolts of the lower supporting legs, gaskets, fastening threaded holes of the lower supporting legs, dials and sliding grooves.
Preferably, a groove is formed in one side of the channel steel, so that external equipment can be conveniently used for observing the change condition of the plate-shaped test piece during the compression experiment. A convex clamping groove is formed in one end of each channel steel, and a concave clamping groove is formed in the other end of each channel steel, so that nesting of a plurality of channel steels can be achieved, and the device is suitable for compression tests of plate-shaped test pieces with different lengths.
Preferably, the channel steel connecting threaded hole is formed in the channel steel, and when the two channel steels are nested together, the channel steel connecting bolt is inserted into the threaded hole, so that the channel steel connection is further reinforced.
Preferably, the channel steel connecting threaded hole penetrates through the channel steel concave clamping groove, and only extends into two thirds of the depth in the channel steel convex clamping groove, so that the channel steel connecting bolt can not penetrate out from the inner side of the channel steel when inserted into the threaded hole, and the interference to a compression test is avoided.
Preferably, the lower supporting leg passes through fastening bolt with the channel-section steel and is connected, and the bolt can reciprocate along the spout to can adjust whole anti-buckling device's height.
Preferably, lower supporting leg fastening screw hole is located the front and back both sides of channel-section steel, only deepens into two-thirds's degree of depth in the channel-section steel, can guarantee like this that lower supporting leg fastening bolt can not wear out from the channel-section steel inboard when inserting the screw hole, avoids disturbing compression test.
Preferably, lower supporting leg rubber cap is located the lower support leg end, can effectively increase the area of contact of supporting leg and testing machine lower supporting bench, prevents to damage the testing machine because the too big pressure of contact surface.
Preferably, the dial and the dial pointer are respectively located on the lower supporting leg and the channel steel, the height adjustment of the whole device can be displayed, and meanwhile whether the four supporting legs are located at the same height or not can be judged according to the position indicated by the dial pointer.
A method for carrying out a compression test on a buckling-restrained device suitable for a compression test of a plate-shaped test piece comprises the following steps:
(1) the number of nested channel steel is adjusted according to the length of the plate-shaped test piece, the buckling prevention device is assembled, the plate-shaped test piece is placed in the channel steel, and the test piece can smoothly slide in the channel steel;
(2) starting the testing machine, and adjusting the height of the lower chuck of the testing machine according to the height of the anti-buckling device to ensure that the height of the lower chuck of the testing machine is lower than that of the lower supporting leg;
(3) placing the anti-buckling device on a lower support table of the testing machine across a lower chuck of the testing machine, adjusting the length of the test piece extending out of two sides of the channel steel, enabling the test piece to be smoothly clamped by an upper chuck and a lower chuck of the testing machine, and then clamping the test piece by the lower chuck;
(4) loosening fastening bolts of the lower supporting legs, adjusting the height of the lower supporting legs, ensuring that the distance between the lower edge of channel steel of the anti-buckling device and a lower chuck of the testing machine is larger than 2 cm, and ensuring that dial readings corresponding to 4 dial pointers are completely consistent, so that the four lower supporting legs are ensured to be at the same height, and then screwing the fastening bolts of the lower supporting legs;
(5) adjusting the height of an upper cross beam of the testing machine to enable the distance between an upper chuck of the testing machine and the upper edge of the channel steel to be larger than 2 cm, and then clamping the upper chuck;
(6) the test procedure was started and the test was started.
Compared with the prior art, the invention has the beneficial effects that:
(1) the test space is large, and the device can be suitable for the compression test of a long plate-shaped test piece;
(2) when the test piece is not under pressure, the test piece is in a non-contact state with the buckling-restrained device, so that the influence on the test precision is avoided;
(3) the whole anti-buckling device is directly placed on the lower support table of the testing machine, the height of the whole anti-buckling device can be adjusted by adjusting the height of the lower support leg, and the anti-buckling device can be matched with most testing machines in the market for use;
(4) channel steel in the buckling-restrained device can be nested in multiple sections, so that the buckling-restrained device can be suitable for compression tests of plate-shaped test pieces with different lengths;
(5) the whole device is convenient to mount and dismount, high in test efficiency and easy to realize batch compression test of the plate-shaped test pieces.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a three-dimensional disassembly schematic diagram of a buckling-restrained device suitable for a plate-shaped test piece compression test provided by the invention;
FIG. 2 is an overall oblique two-axis diagram of a buckling-restrained device suitable for a compression test of a plate-shaped test piece, provided by the invention;
FIG. 3 is a clamping diagram of a testing machine of the buckling-restrained device suitable for the compression test of a plate-shaped test piece provided by the invention;
FIG. 4 is an oblique two-axis diagram of a buckling-restrained device channel steel suitable for a plate-shaped test piece compression test provided by the invention;
FIG. 5 is an oblique two-axis diagram of a lower support leg of the buckling restrained device suitable for a compression test of a plate-shaped test piece provided by the invention;
wherein: 1-channel steel; 2-lower support legs; 3-rubber cap of lower supporting leg; 4-plate-like test pieces; 5-channel steel connecting bolts; 6-dial pointer; 7-channel steel convex clamping groove; 8-a groove with an inward concave channel steel; 9-a channel steel connecting threaded hole; 10-lower support leg fastening bolts; 11-a gasket; 12-lower support leg fastening threaded holes; 13-dial plate; 14-a chute; 15-a tester clamping block; 16-upper beam of the tester; 17-clamping head on the tester; 18-a tester column; 19-a tester support bar; 20-top beam of the tester; 21-lower chuck of testing machine; 22-tester lower support table.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used, they are based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention usually put on when used, only for the purpose of describing the present invention and simplifying the description, but not for the purpose of indicating or implying that the referred device or element must have a specific orientation or position, and thus, should not be construed as limiting the present invention.
As shown in fig. 1 and 2, the buckling-restrained device suitable for the compression test of the plate-shaped test piece provided by the embodiment of the invention comprises a channel steel 1, a lower support leg 2, a lower support leg rubber cap 3, a channel steel connecting bolt 5, a dial indicator 6, a channel steel outer convex clamping groove 7, a channel steel inner concave clamping groove 8, a channel steel connecting threaded hole 9, a lower support leg fastening bolt 10, a gasket 11, a lower support leg fastening threaded hole 12, a dial 13 and a chute 14. The object of the present invention is located in the channel steel 1.
As shown in fig. 4, a groove is formed in one side of the channel steel 1, so that the change condition of the plate-shaped test piece during the compression test can be observed conveniently by using external equipment. A convex clamping groove 7 is formed in one end of the channel steel 1, an inner concave clamping groove 8 is formed in the other end of the channel steel 1, nesting of the channel steels 1 can be achieved, and the device is suitable for compression tests of plate-shaped test pieces with different lengths.
As shown in fig. 1, the channel steel connecting threaded hole 9 is located on the channel steel 1, and when the two channel steels 1 are nested together, the channel steel connecting bolt 5 is inserted into the threaded hole 9, so that the connection of the channel steels 1 is further reinforced. Channel-section steel connecting screw hole 9 runs through channel-section steel indent draw-in groove 8, only deepens to two-thirds's degree of depth in channel-section steel evagination draw-in groove 7, can guarantee like this can not follow channel-section steel 1 inboard when channel-section steel connecting bolt 5 inserts to screw hole 9 and wear out, avoids producing the interference to compression test.
As shown in fig. 2 and 5, the lower support leg 2 is connected to the channel steel 1 by a fastening bolt 10, and the bolt 10 can move up and down along the sliding groove 14, so that the height of the entire anti-buckling device can be adjusted. Lower support leg fastening screw hole 12 is located channel-section steel 1's front and back both sides, only deepens into two-thirds's degree of depth in channel-section steel 1, can guarantee like this that lower support leg fastening bolt 10 can not follow channel-section steel 1 inboard when inserting to screw hole 12 and wear out, avoids producing the interference to compression test. Dial 13 and dial pointer 6 are located lower supporting leg 2 and channel-section steel 1 respectively, can show the height-adjusting of whole device, can judge whether four supporting legs 2 are on same height according to the position that dial pointer 6 points simultaneously.
As shown in figure 3, the rubber cap 3 of the lower supporting leg is positioned at the tail end of the lower supporting leg 2, so that the contact area between the supporting leg 2 and the lower supporting platform 22 of the testing machine can be effectively increased, and the testing machine is prevented from being damaged due to overlarge pressure of the contact surface.
As shown in fig. 3, a method for performing a compression test on a buckling restrained device suitable for a compression test of a plate-shaped test piece comprises the following steps:
(1) the number of the embedded channel steel 1 is adjusted according to the length of the plate-shaped test piece 4, the buckling-restrained device is assembled, the plate-shaped test piece 4 is placed in the channel steel 1, and the test piece 4 can smoothly slide in the channel steel 1;
(2) starting the testing machine, and adjusting the height of the lower chuck 21 of the testing machine according to the height of the anti-buckling device to ensure that the height of the lower chuck 21 of the testing machine is lower than that of the lower supporting leg 2;
(3) putting the anti-buckling device on a lower support table 22 of the testing machine across a lower chuck 21 of the testing machine, adjusting the length of the test piece 4 extending out of two sides of the channel steel 1, enabling the test piece 4 to be smoothly clamped by an upper chuck 17 and the lower chuck 21 of the testing machine, and then clamping the test piece 4 by the lower chuck 21;
(4) loosening the fastening bolts 10 of the lower supporting legs, adjusting the height of the lower supporting legs 2, ensuring that the distance between the lower edge of a channel steel 1 of the anti-buckling device and a lower chuck 21 of the testing machine is larger than 2 cm, and ensuring that the readings of the dials 13 corresponding to 4 dial pointers 6 are completely consistent, so that the four lower supporting legs 2 are ensured to be at the same height, and then screwing the fastening bolts 10 of the lower supporting legs;
(5) adjusting the height of an upper crossbeam 16 of the testing machine to enable the distance between an upper chuck 17 of the testing machine and the upper edge of the channel steel 1 to be larger than 2 cm, and then clamping the upper chuck 17;
(6) the test procedure was started and the test was started.
It should be noted that the above-mentioned embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and although the applicant has described the invention in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions made on the technical solutions of the present invention can not be made within the spirit and scope of the technical solutions of the present invention and shall be covered by the claims of the present invention.
Claims (1)
1. A buckling prevention method suitable for a compression test of a plate-shaped test piece comprises a channel steel (1), a lower support leg (2), a lower support leg rubber cap (3), a channel steel connecting bolt (5), a dial indicator (6), a channel steel outer convex clamping groove (7), a channel steel inner concave clamping groove (8), a channel steel connecting threaded hole (9), a lower support leg fastening bolt (10), a gasket (11), a lower support leg fastening threaded hole (12), a dial (13) and a sliding groove (14);
one side of the channel steel (1) is provided with a groove, so that the change condition of the plate-shaped test piece during the compression test can be observed conveniently by using external equipment, one end of the channel steel (1) is provided with a channel steel outer convex clamping groove (7), and the other end of the channel steel (1) is provided with a channel steel inner concave clamping groove (8), so that the nesting of a plurality of channel steels (1) can be realized, and the device is suitable for the compression test of the plate-shaped test pieces;
the channel steel connecting threaded hole (9) is formed in the channel steel (1), when the two channel steels (1) are nested together in a way that the channel steel convex clamping groove (7) and the channel steel concave clamping groove (8) are matched with each other, the channel steel connecting bolt (5) is inserted into the channel steel connecting threaded hole (9), and the connecting effect of the channel steel (1) is further strengthened;
the channel steel connecting threaded hole (9) penetrates through the channel steel concave clamping groove (8) and only extends into the channel steel convex clamping groove (7) to the depth of two thirds, so that the channel steel connecting bolt (5) can be ensured not to penetrate out of the inner side of the channel steel (1) when inserted into the channel steel connecting threaded hole (9), and the interference on a compression test is avoided;
the lower supporting leg (2) is connected with the channel steel (1) through a lower supporting leg fastening bolt (10), and the lower supporting leg fastening bolt (10) can move up and down along the sliding groove (14), so that the height of the whole anti-buckling device can be adjusted;
the lower supporting leg fastening threaded holes (12) are located on the front side and the rear side of the channel steel (1) and only penetrate into the channel steel (1) to the depth of two thirds, so that the lower supporting leg fastening bolts (10) can be ensured not to penetrate out of the inner side of the channel steel (1) when inserted into the lower supporting leg fastening threaded holes (12), and interference on a compression test is avoided;
the rubber cap (3) of the lower supporting leg is positioned at the tail end of the lower supporting leg (2), so that the contact area between the lower supporting leg (2) and the lower supporting table (22) of the testing machine can be effectively increased, and the testing machine is prevented from being damaged due to overlarge pressure of the contact surface;
the dial (13) and the dial indicator (6) are respectively positioned on the lower supporting legs (2) and the channel steel (1), the height adjustment of the whole device can be displayed, and meanwhile, whether the four lower supporting legs (2) are at the same height can be judged according to the position pointed by the dial indicator (6);
characterized in that the method comprises the following steps:
(1) the number of nested channel steel (1) is adjusted according to the length of the plate-shaped test piece (4), the buckling-restrained device is assembled, the plate-shaped test piece (4) is placed in the channel steel (1), and the plate-shaped test piece (4) can smoothly slide in the channel steel (1);
(2) starting the testing machine, and adjusting the height of the lower chuck (21) of the testing machine according to the height of the anti-buckling device to ensure that the height of the lower chuck (21) of the testing machine is lower than that of the lower supporting leg (2);
(3) putting the anti-buckling device on a lower support table (22) of the testing machine across a lower chuck (21) of the testing machine, adjusting the length of the plate-shaped test piece (4) extending out of two sides of the channel steel (1), enabling the plate-shaped test piece (4) to be smoothly clamped by an upper chuck (17) and the lower chuck (21) of the testing machine, and then clamping the plate-shaped test piece (4) by the lower chuck (21);
(4) loosening the fastening bolts (10) of the lower supporting legs, adjusting the heights of the lower supporting legs (2), ensuring that the distance between the lower edge of a channel steel (1) of the anti-buckling device and a lower chuck (21) of the testing machine is larger than 2 cm, and ensuring that the readings of the graduated scales (13) corresponding to 4 graduated scale pointers (6) are completely consistent, so that the four lower supporting legs (2) are ensured to be at the same height, and then screwing the fastening bolts (10) of the lower supporting legs;
(5) the height of an upper cross beam (16) of the testing machine is adjusted, so that the distance between an upper chuck (17) of the testing machine and the upper edge of the channel steel (1) is larger than 2 cm, and then the upper chuck (17) is clamped;
(6) the test procedure was started and the test was started.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911371090.4A CN110954404B (en) | 2019-12-26 | 2019-12-26 | Buckling-restrained device and method suitable for plate-shaped test piece compression test |
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| CN201911371090.4A CN110954404B (en) | 2019-12-26 | 2019-12-26 | Buckling-restrained device and method suitable for plate-shaped test piece compression test |
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| CN110954404B true CN110954404B (en) | 2021-06-25 |
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