CN112213183A - Test fixture for testing shearing-resistant bearing capacity of wooden pin in wooden structure double-shear connection - Google Patents
Test fixture for testing shearing-resistant bearing capacity of wooden pin in wooden structure double-shear connection Download PDFInfo
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- CN112213183A CN112213183A CN202011106257.7A CN202011106257A CN112213183A CN 112213183 A CN112213183 A CN 112213183A CN 202011106257 A CN202011106257 A CN 202011106257A CN 112213183 A CN112213183 A CN 112213183A
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- 238000012360 testing method Methods 0.000 title claims abstract description 42
- 238000010008 shearing Methods 0.000 title claims abstract description 26
- 239000002023 wood Substances 0.000 claims abstract description 13
- 238000004080 punching Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 3
- 238000004154 testing of material Methods 0.000 abstract description 2
- 238000004088 simulation Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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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
- G01N3/02—Details
- G01N3/04—Chucks
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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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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Abstract
The invention belongs to the technical field of material testing, and relates to a test fixture for testing the shearing bearing capacity of a wood pin in wood structure double-shear connection. The invention is suitable for testing the shearing resistance bearing capacity of the wooden pin under different shearing spans in the double-shearing connection of the wooden structure, the testing device is divided into three parts, the three parts of clamps are all designed into a groove shape, the bottoms of the clamps at two sides are provided with guide rails, the shearing resistance spans can be changed, and the shearing resistance bearing capacity of the wooden pin under different spans can be measured. The invention realizes the change of the shearing resistant span of the wooden pin by adjusting the relative positions of the left clamp and the right clamp, simulates the stress condition of the wooden pin in double-shear connection, and measures the shearing resistant bearing capacity of the wooden pin under different spans. The measuring method is simple and easy to implement, has flexible operability, greatly simplifies the implementation steps of changing the shear-resistant span, and greatly improves the measuring efficiency and precision.
Description
Technical Field
The invention belongs to the technical field of material testing, and relates to a test fixture for testing the shearing bearing capacity of a wood pin in wood structure double-shear connection.
Background
In a wood double shear connection, the wooden pins may also experience shear failure in addition to bending failure. The anti shearing bearing capacity of dowel can receive the influence of shearing span, in order to simulate out the atress condition of dowel when the double shear is connected, this paper provides a novel, efficient test device is in order to measure the dowel and receive the bending, anti shearing bearing capacity when shearing the effect, the part that test device was used for fixed dowel all designs into the flute profile, the preformed hole of substrate when the simulation double shear is connected, recess diameter size is the same with dowel diameter size, the guide rail has been designed to both sides anchor clamps bottom, the change of shearing span can be realized along the guide rail slip to both sides anchor clamps, and then can measure the anti shearing bearing capacity of dowel under the different shearing spans.
Disclosure of Invention
In order to solve the problems, the invention provides a test fixture suitable for testing the shearing resistance and bearing capacity of a wood pin under different shearing spans in the double-shear connection of a wood structure.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a test fixture for testing the shearing resistance of a wooden pin in double-shear connection of a wooden structure comprises a side fixture, a middle fixture and a bottom plate with a track.
The side anchor clamps include side anchor clamps upper portion and side anchor clamps lower part, and side anchor clamps lower part shape is the cuboid of middle fretwork, and the anchor clamps of the left and right sides are the same. The upper plane is provided with a semicircular side clamp lower part groove with the diameter size being the same as that of the wooden pin, in order to keep stability, the lower part of the side clamp is widened, enough height is reserved, enough space can be provided to enable the middle clamp to descend, and enough space is reserved for adjusting the connecting screw at the lower part of the side clamp through the middle hollow design. The upper part of the side clamp is in a cuboid shape, and a semicircular upper part groove of the side clamp, which is the same as the lower part of the side clamp, is formed in the bottom surface of the cuboid. The upper bolt on the upper part of the side clamp is punched to be matched with the upper bolt on the lower part of the side clamp for punching, and the upper part of the side clamp and the lower part of the side clamp are connected through the upper part of the side clamp and the upper part of the side clamp which are connected through the connecting bolt, so that the fixing effect is achieved.
The side anchor clamps lower part is equipped with the lower part bolt and punches, through side anchor clamps sub-unit connection bolt connection side anchor clamps lower part and bottom plate, side anchor clamps sub-unit connection bolt bottom adopts the square head design, will incline anchor clamps sub-unit connection bolt square head end card and go into in the bottom plate track, the side anchor clamps sub-unit connection bolt's square head design can guarantee that side anchor clamps sub-unit connection bolt can slide along the direction of guide rail, and do not produce and reciprocate, adjust the position after, will incline anchor clamps sub-unit connection bolt and tighten, can fix the lower part platform 12 and the bottom plate of side anchor clamps. Side anchor clamps upper portion recess and side anchor clamps lower part recess are both sides anchor clamps upper portion and the recess of lower part respectively for the cotter way of simulation double shear test, and side anchor clamps upper groove rubber layer and side anchor clamps lower groove rubber layer are the rubber layer that thickness is 1mm in the middle of the recess about the anchor clamps of both sides respectively, and the rubber layer can be inseparabler with the dowel contact, lets the dowel atress more even, has avoided metal anchor clamps and dowel direct contact simultaneously and has leaded to the condition that the dowel local destruction. After the pin grooves are manufactured, the grooves of the upper part and the lower part of the clamp on the two sides are cut off by 2mm in thickness respectively so as to ensure that the clamp can fully clamp the wooden pins.
The middle clamp is a part for bearing load, the upper part and the lower part of the middle clamp are an upper part and a lower part of the middle clamp, the middle clamp connecting bolt is used for connecting and fixing the upper part and the lower part of the middle clamp, the upper groove of the middle clamp, the lower groove of the side clamp are semicircular grooves of the middle clamp, and the rubber layer of the upper groove of the middle clamp and the rubber layer of the lower groove of the middle clamp are rubber layers with the thicknesses of 1mm of the upper groove and the lower groove respectively. When the middle clamp is used, attention should be paid to the fact that the lower portion of the middle clamp faces downwards, the upper portion of the middle clamp faces upwards, the purpose is to ensure that the upper portion of the middle clamp is a flat plane, a loading head of a testing machine can be completely attached to the middle clamp, and the clamp can be uniformly stressed.
The bottom plate of the device can be used for fixing the clamps on two sides, and the bottom plate of the bottom can be fixed on a test bed. The bottom plate connecting bolt is used for connecting and fixing the bottom plate and a platform of the testing machine. The guide rail is a track reserved on the bottom plate, and 33 can realize the function that the clamps on two sides can slide on the guide rail at will. Meanwhile, the guide rail of the bottom plate adopts a design of oblique intersection (the included angle between the rail and the horizontal line is 30 degrees), so that the friction between the bolt and the rail is increased under a stress state, and the bolt is more stably fixed.
The invention has the beneficial effects that:
the invention realizes the change of the shearing resistant span of the wooden pin by adjusting the relative positions of the left clamp and the right clamp, simulates the stress condition of the wooden pin in double-shear connection, and measures the shearing resistant bearing capacity of the wooden pin under different spans. The measuring method is simple and easy to implement, has flexible operability, greatly simplifies the implementation steps of changing the shear-resistant span, and greatly improves the measuring efficiency and precision.
Drawings
FIG. 1 is an overall schematic view of the middle and side clamps.
FIG. 2 is a schematic side view of the clamp.
Fig. 3 is a schematic view of an intermediate clamp.
Figure 4 is a schematic view of a fixed base plate.
FIG. 5 shows a bolt Sb2The friction force between the guide rail and the stressed force is schematically shown.
In the figure: 1, a side clamp; 2, an intermediate clamp; 3, a bottom plate; 11 side clamp upper part; 12 side clamp lower part; the upper part of the 13-side clamp is connected with a bolt; a bolt is connected to the lower part of the 14-side clamp; 1301, punching holes on upper bolts; 1302, punching holes below the upper bolts; 1401 perforating the lower bolt; 1501 side clamp upper groove; 1502 side clamp lower groove; a groove rubber layer is arranged on the 1601 side clamp; a 1602 side clamp lower groove rubber layer; 21 the upper part of the middle clamp; 22 the lower part of the middle clamp; 23 connecting bolts of the middle clamp; 2301 perforating the connecting bolt; 2302 connecting bolts are punched below; 2401 a middle clamp upper groove; 2402 a lower groove of the middle clamp; 2501 a groove rubber layer is arranged on the middle clamp; 2502 middle clamp lower groove rubber layer; 31 a bottom plate connecting bolt; 32 guide rails.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
A test fixture for testing the shearing resistance bearing capacity of a wooden pin in double-shear connection of a wooden structure comprises a side fixture 1, a middle fixture 2 and a bottom plate 3 with a track.
The side anchor clamps 1 includes side anchor clamps upper portion 11 and side anchor clamps lower part 12, and side anchor clamps lower part 12 shape is middle fretwork cuboid, and the anchor clamps of the left and right sides are the same. The upper plane is provided with a semicircular side clamp lower groove 1502 with the same diameter size as the wooden pin, in order to keep stability, the side clamp lower part 12 is widened, enough height is reserved, enough space can be provided for descending the middle clamp 2, and enough space is reserved for adjusting the side clamp lower part connecting screw 14 through the middle hollow design. The side jig upper part 11 is shaped like a rectangular parallelepiped, and a semicircular side jig upper groove 1501 identical to the side jig lower part 12 is provided on the bottom surface of the rectangular parallelepiped. The upper bolt upper hole 1301 of the side clamp upper part 11 is matched with the upper bolt lower hole 1302 of the side clamp lower part 12, and the side clamp upper part 11 and the side clamp lower part 12 are connected through the side clamp upper part connecting bolt 13 to play a role in fixing.
The lower part 12 of the side clamp is provided with a lower bolt punch 1401, the lower part 12 of the side clamp is connected with the bottom plate 3 through a lower part 14 of the side clamp, the bottom of the lower part 14 of the side clamp is connected with the lower part 14 of the side clamp, the square head of the lower part 14 of the side clamp is clamped into the track of the bottom plate 3, the square head of the lower part 14 of the side clamp is designed to ensure that the lower part 14 of the side clamp can slide along the direction of the guide rail 32 without moving up and down, after the position is adjusted, the lower part 14 of the side clamp is screwed, and the lower platform 12 of the side clamp and the bottom plate 3 can be completely fixed together through the lower part 14 of the side clamp. Side anchor clamps upper portion recess 1501 and side anchor clamps lower part recess 1502 are the recess of both sides anchor clamps upper portion and lower part respectively for the cotter way of simulation double shear test, and side anchor clamps upper groove rubber layer 1601 and side anchor clamps lower groove rubber layer 1602 are the rubber layer that thickness is 1mm in the middle of the recess about the anchor clamps of both sides respectively, and the rubber layer can be inseparabler with the contact of dowel, makes the dowel atress more even, has avoided metal anchor clamps and dowel direct contact simultaneously and has leaded to the condition that the dowel is local to be destroyed. After the pin grooves are manufactured, the grooves of the upper part and the lower part of the clamp on the two sides are cut off by 2mm in thickness respectively so as to ensure that the clamp can fully clamp the wooden pins.
The middle clamp 2 is a load bearing part, the middle clamp upper part 21 and the middle clamp lower part 22 are an upper part and a lower part of the middle clamp, the middle clamp connecting bolt 23 is a bolt for connecting and fixing the middle clamp upper part 21 and the middle clamp lower part 22, the middle clamp upper groove 2401, the middle clamp lower groove 2402, the clamp upper groove 1501 on the same side and the side clamp lower groove 1502 are semicircular grooves of the middle clamp, and the middle clamp upper groove rubber layer 2501 and the middle clamp lower groove rubber layer 2502 are rubber layers with the thickness of an upper groove and a lower groove of 1mm respectively. When the middle clamp 2 is used, attention should be paid to the fact that the lower portion 22 of the middle clamp faces downwards and the upper portion 21 of the middle clamp faces upwards, the purpose is to ensure that the upper portion of the middle clamp is a flat plane, the loading head of the testing machine can be completely attached to the middle clamp, and the clamp can be uniformly stressed.
The bottom plate 3 of the device can be used for fixing clamps on two sides, and the bottom plate 3 of the bottom can be fixed on a test bed. The base plate connecting bolt 31 is used for connecting and fixing the base plate and the platform of the testing machine. The guide rails 32 are rails reserved on the bottom plate, and the clamps on both sides 33 can slide on the guide rails at will. Meanwhile, the guide rail 32 of the bottom plate adopts a design of oblique intersection (the included angle between the rail and the horizontal line is 30 degrees), so that the friction between the bolt and the rail can be increased under the stress state of the bolt, and the bolt is more stably fixed.
The using method of the invention is as follows: referring to the attached drawing 1, firstly, a bottom plate 3 is fixed on a testing machine platform through a bolt 31, then clamps on two sides slide to a target position through a guide rail 32, then the clamps on the two sides are fixed on the bottom plate 3 through a bolt 14, then a wooden pin is placed in a groove in the part of the clamps 1 on the two sides, then an upper part 11 and a lower part 12 of a side clamp are connected through a bolt 13, and the grooves of the upper part 11 and the lower part 12 of the side clamp just wrap the wooden pin to simulate the connection working condition of the wooden pin. The clamps on both sides are symmetrical and operate the same. Finally, the intermediate clamp is clamped on the wooden pin and is screwed and fixed through the bolt 23. A load may be applied to the intermediate clamp portion using the loading head.
The advantages of the clamp are as follows: the groove can simulate a pin slot, the reasonable design of the guide rail can meet the requirement of arbitrary shearing span, clamps on two sides can be fixed after the span is adjusted, and no relative movement between the two clamps is ensured during the test.
Claims (5)
1. The test fixture for testing the shearing resistance bearing capacity of the wooden pin in the double-shear connection of the wooden structure is characterized by comprising a side fixture (1), a middle fixture (2) and a bottom plate (3) with a track;
the side clamp (1) comprises a side clamp upper part (11) and a side clamp lower part (12), the side clamp lower part (12) is a cuboid with a hollow middle, and the clamps on the left side and the right side are the same; a semicircular side clamp lower groove (1502) with the same diameter size as the wooden pin is arranged on the upper plane, the upper part (11) of the side clamp is cuboid, and a semicircular side clamp upper groove (1501) with the same diameter size as the lower part (12) of the side clamp is arranged on the bottom surface of the cuboid; an upper bolt upper punching hole (1301) of the side clamp upper part (11) is matched with an upper bolt lower punching hole (1302) of the side clamp lower part (12), and the side clamp upper part (11) and the side clamp lower part (12) are connected through a side clamp upper part connecting bolt (13) to play a role in fixing;
a lower bolt hole (1401) is formed in the lower portion (12) of the side clamp, the lower portion (12) of the side clamp and the bottom plate (3) are connected through a lower portion connecting bolt (14) of the side clamp, the bottom of the lower portion connecting bolt (14) of the side clamp is in a square head design, the square head end of the lower portion connecting bolt (14) of the side clamp is clamped into a track of the bottom plate (3), the square head design of the lower portion connecting bolt (14) of the side clamp ensures that the lower portion connecting bolt (14) of the side clamp slides along the direction of a guide rail (32) without moving up and down, after the position is adjusted, the lower portion connecting bolt (14) of the side clamp is screwed, and the lower platform (12) of the side clamp and the bottom plate (3) are completely fixed together through the lower portion connecting bolt (14) of the side clamp; the upper groove (1501) and the lower groove (1502) of the side clamp are respectively grooves at the upper part and the lower part of the side clamp and are used for simulating pin grooves of a double shear test;
the middle clamp (2) is a load bearing part, the upper part (21) and the lower part (22) of the middle clamp are an upper part and a lower part of the middle clamp, a middle clamp connecting bolt (23) is used for connecting and fixing the bolts for the upper part (21) and the lower part (22) of the middle clamp, an upper groove (2401) of the middle clamp (2), a lower groove (2402) of the middle clamp, an upper groove (1501) of the clamp on the same side as the upper groove (2402) of the middle clamp and a lower groove (1502) of a side clamp are semicircular grooves of the middle clamp, when the middle clamp (2) is used, the lower part (22) of the middle clamp is downward, the upper part (21) of the middle clamp is upward, the purpose is to ensure that the upper part of the middle clamp is a flat plane, a loading head of a testing machine can be completely;
the bottom plate (3) of the device is used for fixing the clamps at two sides, and the bottom plate (3) at the bottom is fixed on the test bed; the bottom plate connecting bolt (31) is used for connecting and fixing the bottom plate and a platform of the testing machine; the guide rail (32) is a track reserved on the bottom plate.
2. The test fixture for testing the shear resistance of a wood dowel in a double shear connection of a wood structure according to claim 1, wherein the side fixture upper groove rubber layer (1601) and the side fixture lower groove rubber layer (1602) are rubber layers with a thickness of 1mm in the upper and lower grooves of the two side fixtures respectively, and the middle fixture upper groove rubber layer (2501) and the middle fixture lower groove rubber layer (2502) are rubber layers with a thickness of 1mm in the upper and lower grooves respectively.
3. A test fixture for testing the shear capacity of a wooden pin in a double shear connection of a wooden structure according to claim 1 or 2, wherein the grooves of the upper and lower parts of the two-sided fixture are cut off by 2mm in thickness to ensure that the fixture can sufficiently clamp the wooden pin.
4. The test fixture for testing shear bearing capacity of a wood dowel in a wood structural double shear connection of claim 1 or 2, wherein the guide rail (32) is angled 30 ° from horizontal.
5. A test fixture for testing the shear bearing capacity of a wood dowel in a wood structural double shear connection, as defined in claim 3, wherein said guide rails (32) are angled 30 ° from horizontal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011106257.7A CN112213183B (en) | 2020-10-16 | 2020-10-16 | Test fixture for testing shearing bearing capacity of wood pin in double-shearing connection of wood structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011106257.7A CN112213183B (en) | 2020-10-16 | 2020-10-16 | Test fixture for testing shearing bearing capacity of wood pin in double-shearing connection of wood structure |
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| CN112213183A true CN112213183A (en) | 2021-01-12 |
| CN112213183B CN112213183B (en) | 2024-08-30 |
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| CN112213183B (en) | 2024-08-30 |
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