A boundary condition adjustable ship stiffened plate axial compression test device and method

Abstract

The application discloses a kind of boundary conditions adjustable ship stiffened plate axial compression test device, including loading frame, stiffened plate test piece, clamping tool, boundary adjusting part and axial compression loading mechanism;The bottom of the loading frame is placed on the ground;The stiffened plate test piece is vertically arranged, the upper end of stiffened plate test piece is connected with loading frame, the lower end of stiffened plate test piece is in contact with the upper end of axial compression loading mechanism, the upper end of axial compression loading mechanism is driving end, and axial compression loading mechanism is arranged on the ground;The clamping tool has two groups, and is arranged on the two sides of stiffened plate test piece;The inner side of clamping tool is connected with the edge of stiffened plate test piece by boundary adjusting part, the lower end of clamping tool is arranged on the base, and the upper end of clamping tool is connected with loading frame.The beneficial effects of the application are as follows: the two side boundaries of stiffened plate test piece are connected together with clamping tool by using boundary adjusting part, the boundary conditions of stiffened plate test piece can be adjusted according to boundary adjusting part, and the accuracy of test results is improved.

Description

Technical Field

[0001] The invention relates to the technical field of test loading, and in particular to a device and method for testing axial compression of ship stiffened plates with adjusted boundary conditions. Background Art

[0002] Stiffened plates are fundamental building blocks of ships and are widely studied for their load-bearing capacity. Their load-bearing capacity and characteristics are crucial for assessing ship safety and reliability. When a ship bends under the action of waves during navigation, the stiffened plates within the structure are subjected to repeated tensile and compressive loads. Because stiffened plates are generally thin, stability failure under compressive loads is a common failure mode in stiffened plates, warranting the attention of designers.

[0003] The axial compression loading strength test of ship stiffened plate structures (hereinafter referred to as axial compression test) is the most accurate and reliable means to study the axial compression bearing characteristics of the structure, and the test boundary conditions are one of the most important factors affecting the test results. Unlike simulation finite element analysis, the boundaries of the structural model in the test are subject to many restrictions and need to be appropriately simplified. Based on the existing ship stiffened plate axial compression test tooling technology, ship stiffened plate axial compression test research is often forced to use "free boundaries" and "quasi-simply supported clamping boundaries", and it is impossible to achieve flexible adjustment of the structural boundary constraint effect, resulting in a decrease in the accuracy of the test results. Therefore, it is necessary to develop a ship stiffened plate axial compression test device and method with adjustable boundary conditions based on the existing tooling technology to improve the boundary processing method and test result reliability of the stiffened plate axial compression test. Summary of the Invention

[0004] The purpose of the present invention is to provide a ship stiffener axial compression test device and method with adjustable boundary conditions to address the deficiencies of the existing technology, so as to improve the accuracy of the test results.

[0005] The technical solution adopted by the present invention is: a ship stiffened plate axial compression test device with adjustable boundary conditions, comprising a loading frame, a stiffened plate specimen, a clamping fixture, a boundary adjustment member and an axial compression loading mechanism;

[0006] The bottom of the loading frame is placed on the ground;

[0007] The stiffened plate specimen is arranged vertically, the upper end of the stiffened plate specimen is connected to the loading frame, the lower end of the stiffened plate specimen is in contact with the upper end of the axial pressure loading mechanism, the upper end of the axial pressure loading mechanism is the driving end, and the axial pressure loading mechanism is arranged on the ground;

[0008] There are two groups of clamping fixtures, which are arranged on both sides of the stiffened plate specimen; the inner side edges of the clamping fixtures are connected to the edges of the stiffened plate specimen through boundary adjustment pieces, the lower ends of the clamping fixtures are arranged on the base, and the upper ends of the clamping fixtures are connected to the loading frame.

[0009] According to the above scheme, the loading frame includes loading gantries on both sides and a loading beam connecting the upper parts of the two loading gantries; the upper end of the stiffened plate specimen and the upper end of the clamping tool are both connected to the bottom of the loading beam.

[0010] According to the above solution, the clamping tool includes a clamping body, a tool sleeve and a tool top plate;

[0011] The vertical edge of the clamping body is connected to the edge of the stiffened plate specimen through a boundary adjustment piece;

[0012] The lower end of the clamping body is connected to the upper end of the tooling sleeve, and the tooling sleeve is arranged on the base; the upper end of the clamping body is connected to the tooling top plate arranged on the top of the loading frame through the tooling screw.

[0013] According to the above scheme, the clamping body includes an upper end plate, a lower end plate, and a first plate body and a second plate body arranged vertically and perpendicular to each other between the upper end plate and the lower end plate; the lower end plate is connected to the upper end of the tooling sleeve, and the upper end plate is arranged on the lower surface of the loading beam and is connected to the tooling top plate through a tooling screw; the first plate body and the second plate body are connected by a plurality of triangular reinforcement plates arranged vertically at intervals; the vertical edge of the first plate body is provided with a first adjustment hole for connecting to the stiffened plate specimen.

[0014] According to the above scheme, the stiffened plate specimen is a plate structure with ribs in the middle, and a plurality of second adjustment holes for connecting to boundary adjustment pieces are provided on both side edges of the stiffened plate specimen at intervals along the height direction; the lower end of the stiffened plate specimen is connected to the load-sharing base, and the upper end of the stiffened plate specimen is connected to the fixed plate.

[0015] According to the above solution, the boundary adjustment member includes a pressure plate and a restraining bolt;

[0016] A third adjustment hole corresponding to the position of the first adjustment hole is provided on the pressure plate; the edge portions of the pressure plate and the clamping body are arranged on both sides of the edge of the stiffened plate specimen, the third adjustment hole of the pressure plate, the second adjustment hole of the stiffened plate specimen and the first adjustment hole of the clamping body are adapted to each other, and the restraining bolt passes through the third adjustment hole, the second adjustment hole and the first adjustment hole in sequence to connect and fix the pressure plate, the stiffened plate specimen and the clamping body; the restraining bolt is also equipped with a hole pressure sensor.

[0017] According to the above solution, the first adjustment hole, the second adjustment hole and the third adjustment hole are all waist-round holes.

[0018] According to the above scheme, the axial pressure loading mechanism is a loading oil top, and the driving end of the axial pressure loading mechanism is located just below the bottom of the stiffened plate specimen.

[0019] According to the above scheme, the loading portal and the loading beam are both steel structures welded from steel plates, wherein the loading portal includes a front flange plate, a rear flange plate and a portal web connecting the front and rear flange plates; the loading beam includes an upper flange plate, a lower flange plate and a beam web connecting the upper and lower flange plates, and the ends of the upper flange plate, the lower flange plate and the beam web of the loading beam are all connected to the portal web.

[0020] The present invention also discloses a method for testing ship stiffened plates under axial compression, using the above-mentioned testing device, the method comprising:

[0021] Make reinforced plate specimens;

[0022] The stiffened plate specimen is mounted on the ship stiffened plate axial compression test device, and the second adjustment holes on both sides of the stiffened plate specimen, the first adjustment hole on the clamping fixture, and the third adjustment hole on the pressure plate are positioned in a corresponding relationship, and the three are constrained together by restraining bolts, and the annular pressure sensor records the preload force provided by the restraining bolts;

[0023] Tighten the restraining bolts on both sides of the stiffened plate specimen, and monitor and record the bolt preload at this time using an annular pressure sensor to ensure that the preload of each restraining bolt remains consistent.

[0024] Start the axial compression loading mechanism arranged under the stiffened plate specimen to apply the set axial compression load to the stiffened plate specimen and maintain the load for the set time. During this process, the model strain / stress response data is recorded and stored.

[0025] The axial compression load is removed and the constraints of the stiffened plate specimens by the restraint bolts are loosened, thus completing a loading test.

[0026] The beneficial effects of the present invention are:

[0027] 1) The present invention utilizes boundary adjustment members to connect the boundaries of both sides of the stiffened plate specimen with the clamping fixture. The boundary conditions of the stiffened plate specimen can be adjusted according to the boundary adjustment members, thereby achieving the adjustment of the boundary conditions and obtaining boundary conditions that are closer to the actual state. Compared with the existing technology, the accuracy of the test results is greatly improved.

[0028] 2) In the present invention, the boundary condition can be estimated based on the bolt preload obtained by the center hole sensor test, and can also be determined by the position of the waist round hole and the number of bolts, thereby expanding the scope of boundary condition adjustment.

[0029] 3) The clamping fixture of the present invention can be adjusted in position by the allowance between the screws, and the base can be adjusted in position by the waist-round slot, which can be applied to loading frames and stiffened plate specimens of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is an overall schematic diagram of Example 1 of the present invention.

[0031] Figure 2 Schematic diagram of the clamping fixture.

[0032] Figure 3 Schematic diagram of the stiffened plate specimen.

[0033] Figure 4 A schematic diagram of the base.

[0034] Figure 5 Schematic diagram of the pressure plate.

[0035] Figure 6 Schematic diagram of the connection between the boundary adjustment part and the clamping fixture, pressure plate and stiffened plate specimen.

[0036] Figure 7 This is a diagram of the equipment used in the actual testing process of No. 2 Middle School.

[0037] Figure 8 This is the stress cloud diagram of the stiffened plate specimen during the test of Example 2.

[0038] Figure 9 This is the stress cloud diagram of the stiffened plate specimen during the comparative test.

[0039] Figure 10 Target stress cloud diagram of the stiffened plate specimen.

[0040] Among them: 1. Loading gantry; 2. Loading beam; 3. Clamping tool; 3.1. First plate; 3.2. Second plate; 3.3. Third plate; 3.4. Triangular reinforcement plate; 3.5. Upper end plate; 3.6. Lower end plate; 4. Base; 5. Pressure plate; 6. Reinforced plate specimen; 7. Loading oil top; 8. Boundary adjustment piece; 9. Tool sleeve; 10. Tool screw; 11. Tool top plate; 12. First adjustment hole; 13. Fixed plate; 14. Second adjustment hole; 15. Load-sharing base; 16. Limiting cylinder; 17. External thread; 18. Third adjustment hole; 19. Constraint bolt; 20. Annular pressure sensor. DETAILED DESCRIPTION

[0041] In order to better understand the present invention, the technical solution of the present invention is described in detail below with reference to the accompanying drawings and specific implementation cases.

[0042] like Figure 1The illustrated one kind border condition adjustable ship stiffened plate axial compression test device includes loading frame, stiffened plate test piece 6, clamping tool 3, border adjusting part 8 and axial compression loading mechanism;

[0043] The bottom of the loading frame is placed on the ground.

[0044] The stiffened plate test piece 6 is vertically arranged, the upper end of the stiffened plate test piece 6 is connected with the loading frame, the lower end of the stiffened plate test piece 6 is in contact with the upper end of the axial compression loading mechanism, the upper end of the axial compression loading mechanism is a driving end, and the axial compression loading mechanism is arranged on the ground.

[0045] The clamping tool 3 has two groups and is arranged on the two sides of the stiffened plate test piece 6; the inner side of the clamping tool 3 is connected with the edge of the stiffened plate test piece 6 through the border adjusting part 8, the lower end of the clamping tool 3 is arranged on the base 4, and the upper end of the clamping tool 3 is connected with the loading frame.

[0046] In the application, the axial compression loading mechanism and the base 4 are arranged on the ground; the axial compression loading mechanism can be a loading oil top 7, the driving end (i.e. the upper end) of the axial compression loading mechanism is located directly below the bottom of the stiffened plate test piece 6, and uniform axial compression load is applied to the stiffened plate test piece 6. The clamping tool 3 is arranged on the two sides of the stiffened plate test piece 6, and the upper end of the clamping tool 3 is connected with the loading frame and the lower end of the clamping tool 3 is connected with the base 4, so that the clamping tool 3 is positioned and constrained.

[0047] Preferably, the loading frame comprises loading portal frames 1 on the two sides and a loading cross beam 2 connected to the upper parts of the two loading portal frames 1; the upper end of the stiffened plate test piece 6 and the upper end of the clamping tool 3 are connected with the bottom of the loading cross beam 2.

[0048] In the application, the loading portal frame 1 and the loading cross beam 2 are both steel structures welded by steel plates, wherein the loading portal frame 1 comprises a front flange plate, a rear flange plate and a portal web connecting the front and rear flange plates; the loading cross beam 2 comprises an upper flange plate, a lower flange plate and a cross beam web connecting the upper and lower flange plates, and the end parts of the upper flange plate, the lower flange plate and the cross beam web of the loading cross beam 2 are connected with the portal web; holes are formed in each plate body for bolt connection between each tool component and the test piece.

[0049] Preferably, the clamping tool 3 comprises a clamping main body, a tool sleeve 9 and a tool top plate 11.

[0050] The vertical edge of the clamping main body is connected with the edge of the stiffened plate test piece 6 through the border adjusting part 8.

[0051] The lower end of the clamping main body is connected with the upper end of the tool sleeve 9, and the tool sleeve 9 is arranged on the base 4; the upper end of the clamping main body is connected with the tool top plate 11 arranged on the top of the loading frame (specifically the loading cross beam 2) through the tool screw 10.

[0052] In the present invention, the tooling top plate 11 is located at the top of the loading beam 2, and the four corners of the tooling top plate 11 are respectively connected to the top of the clamping body at the bottom of the loading beam 2 through the tooling screws 10; the tooling sleeve 9 is adapted to the limiting cylinder 16 on the base 4, and the tooling sleeve 9 is inserted into the limiting cylinder 16 and tightened by the circumferentially arranged tightening bolts to realize the bottom limit of the clamping body.

[0053] Preferably, the clamping body includes an upper end plate 3.5, a lower end plate 3.6, and a first plate body 3.1 and a second plate body 3.2 arranged vertically and perpendicular to each other between the upper end plate 3.5 and the lower end plate 3.6; the lower end plate 3.6 is connected to the upper end of the tooling sleeve 9, and the upper end plate 3.5 is arranged on the lower surface of the loading beam 2 and is connected to the tooling top plate 11 through the tooling screw 10; the first plate body 3.1 and the second plate body 3.2 are connected by a plurality of triangular reinforcement plates 3.4 arranged vertically at intervals; the vertical edge of the first plate body 3.1 is provided with a first adjustment hole 12 for connecting to the stiffened plate specimen 6.

[0054] In the present invention, a first adjustment hole 12 is opened on the inner edge of the first plate body 3.1 and is connected to the edge of the stiffened plate specimen 6; the outer side of the first plate body 3.1 is connected to the second plate body 3.2; and a third plate body 3.3 is also connected to the outer side of the second plate body 3.2, and the third plate body 3.3 is perpendicular to the second plate body 3.2.

[0055] Preferably, the stiffened plate specimen 6 is a plate structure with a rib in the middle, and a plurality of second adjustment holes 14 for connecting to the boundary adjustment member 8 are provided on both side edges of the stiffened plate specimen 6 at intervals along the height direction; the lower end of the stiffened plate specimen 6 is connected to the load-sharing base 15, and the upper end of the stiffened plate specimen 6 is connected to the fixed plate 13.

[0056] In the present invention, the bottom of the stiffened plate specimen 6 is connected to the upper end of the axial compression loading mechanism through a load-sharing base 15, and the load-sharing base 15 converts the load applied by the axial compression loading mechanism into a uniformly distributed axial compression load; the top of the stiffened plate specimen 6 is connected to the loading beam 2 through a fixing plate 13.

[0057] Preferably, the boundary adjustment member 8 includes a pressure plate 5 and a restraining bolt 19;

[0058] The pressure plate 5 is provided with a third adjustment hole 18 corresponding to the position of the first adjustment hole 12. The edges of the pressure plate 5 and the clamping body are located at the front and rear sides of the edge of the stiffened plate specimen 6. The third adjustment hole 18 of the pressure plate 5, the second adjustment hole 14 of the stiffened plate specimen 6, and the first adjustment hole 12 of the clamping body are aligned. The restraining bolt 19 passes through the third adjustment hole 18, the second adjustment hole 14, and the first adjustment hole 12 in sequence to connect and secure the pressure plate 5, the stiffened plate specimen 6, and the clamping body. The restraining bolt 19 is also equipped with a hole pressure sensor 20. The bolt preload of the restraining bolt 19 can be measured by the annular pressure sensor 20. In the present invention, the first adjustment hole 12, the second adjustment hole 14, and the third adjustment hole 18 are all waist-round holes.

[0059] Example 1

[0060] like Figure 1 The device shown is a ship stiffened plate axial compression test device with adjustable boundary conditions, comprising a loading frame consisting of a loading gantry 1 and a loading beam 2, wherein the upper end of the stiffened plate specimen 6 is connected to the loading beam 2; the clamping fixture 3 is arranged on the left and right sides of the stiffened plate specimen 6, with its upper side connected to the loading beam 2 and its lower side connected to the base 4 to realize the constrained positioning of the clamping fixture 3; the axial compression loading mechanism is a loading oil top 7, which is arranged directly below the stiffened plate specimen 6 to apply a uniformly distributed axial compression load.

[0061] like Figure 2 The clamping tool 3 shown, the tool screw 10 and the tool top plate 11 are used in combination so that the clamping body of the clamping tool 3 can adapt to loading beams 2 with different sizes in width and height directions; the tool sleeve 9 will be assembled with the limiting cylinder 16 of the base 4 to realize the constrained positioning of the clamping tool 3.

[0062] like Figure 3 The stiffened plate specimen 6 shown in the figure has a fixed plate 13 at the upper end thereof for connecting with the loading beam 2, and a load-sharing base 15 at the lower end thereof for converting the load of the loading oil top 7 into a uniformly distributed axial compressive load; the second adjustment holes 14 on both side edges of the stiffened plate specimen 6 are used for constraining the positioning of the bolts 19.

[0063] like Figure 4 The base 4 has a fixed limiting cylinder 16 on the upper part, and a plurality of tightening bolt holes are arranged circumferentially on the limiting cylinder 16. After the tooling sleeve 9 is inserted into the limiting cylinder 16, the tightening bolts pass through the tightening bolt holes and tighten the outer wall of the tooling sleeve 9, thereby constraining the positioning of the clamping tool 3; this connection method does not require the clamping tool 3 and the base 4 to be precisely matched in size, which is more convenient for assembly in actual tests.

[0064] like Figure 5 The pressure plate 5 in the boundary adjustment member 8 shown in the figure is provided with a third adjustment hole 18 in the height direction for constraining the positioning of the bolt 19; Figure 6 As shown, the edge of the stiffened plate specimen 6 is constrained between the clamping body and the pressure plate 5. The restraining bolts 19 sequentially pass through the first adjustment hole 12 of the clamping body, the second adjustment hole 14 of the stiffened plate specimen 6, and the third adjustment hole 18 of the pressure plate 5, connecting the three together. A greater bolt preload means a stronger boundary constraint on the stiffened plate specimen 6. The bolt preload data of the restraining bolts 19 can be obtained through testing with the annular pressure sensor 20. In addition to adjusting the bolt preload of the restraining bolts 19, different boundary constraints can be achieved by varying the position and number of restraining bolts 19, providing more flexible adjustment.

[0065] Implementation 2

[0066] This embodiment uses the apparatus described in Example 1 to perform an axial compression loading test on a stiffened plate structure of an actual ship. The target stiffened plate structure is a typical deck component of an actual ship, and is primarily subjected to axial compression loads from the ship's longitudinal bending. A method for axial compression testing of a ship's stiffened plate is as follows:

[0067] Step 1: Prepare a stiffened plate specimen 6. The stiffened plate specimen 6 is a target stiffened plate structure that has been scaled down to ensure its mechanical properties are consistent with the prototype. In this embodiment, the stiffened plate specimen 6 has a length a of 1050 mm, a width b of 350 mm, a thickness of 4 mm, and is made of AH36 marine high-strength structural steel.

[0068] Step 2: Install the stiffened plate specimen 6 on the above-mentioned ship stiffened plate axial compression test device. The specific installation method is:

[0069] The stiffened plate specimen 6 is connected to the loading beam 2, and the two sides of the stiffened plate specimen 6 cooperate with the clamping fixture 3 and the boundary adjustment member 8. The second adjustment holes 14 (also known as waist-shaped holes) on the two sides of the stiffened plate specimen 6, the first adjustment hole 12 on the clamping fixture 3, and the third adjustment hole 18 on the pressure plate 5 form a positional correspondence and are constrained together by the restraining bolt 19. The restraining bolt 19 is also equipped with an annular pressure sensor 20 for recording the preload force provided by the restraining bolt 19. Since the stiffened plate specimen 6, the clamping fixture, and the adjustment holes on the pressure plate are all waist-shaped holes, the stiffened plate specimen 6 will still retain the ability to deform axially during loading. Figure 7 This is a diagram that records the actual test situation in the implementation case.

[0070] Step 3: Use tools to tighten the constraint bolts 19 arranged on both sides of the stiffened plate specimen 6 to a certain degree, and monitor and record the bolt preload force at this time through the annular pressure sensor 20; then adjust the tightness of the corresponding constraint bolt 19 according to the preload force data monitored by each annular pressure sensor 20, and finally keep the preload force of each constraint bolt 19 consistent.

[0071] Step 4: Start the axial compression loading mechanism arranged below the stiffened plate specimen 6, apply a set axial compression load to the stiffened plate specimen 6, and maintain the load for a set time. During this process, record and store the model strain / stress response data.

[0072] Step 5: Slowly remove the axial compression load and loosen the constraints of the restraint bolts 19 on the stiffened plate specimen 6, thus completing one loading test.

[0073] If a second loading test is required, try tightening the restraining bolts 19 again. At this time, a different pre-tightening force can be selected according to specific research needs, and the above operation can be repeated.

[0074] Comparative Example

[0075] In this comparative example, an existing tooling (such as that described in CN109297821B) was used to perform an axial compression loading test on the same stiffened plate specimen 6 .

[0076] Figure 8 and Figure 9 The stress cloud diagrams of the stiffened plate specimen 6 in Example 2 and the comparative example are shown in sequence. Figure 10 The target stress cloud diagram of the stiffened plate specimen is obtained using existing technology. The horizontal axis in each figure represents the range of 30% to 70% of the length of the stiffened plate specimen 6, and the vertical axis represents the range of 10% to 90% of the width of the stiffened plate specimen 6. By comparison, it can be seen that the stress cloud diagram in Example 2 ( Figure 8 ) is similar to the target cloud map ( Figure 10 ) is close, while the stress cloud diagram of the traditional tooling technology result ( Figure 9 ) is the same as the target cloud ( Figure 10 ), which shows that the test results of the present invention are closer to the actual situation and have higher reliability.

[0077] The boundary constraint provided by the present invention for the ship stiffened plate model is actually an elastic boundary constraint between fully fixed and completely free, more consistent with the boundary constraint effect of stiffened plates in actual ship structures. For situations where stiffened plate specimen 6 is subject to varying degrees of constraint, the boundary adjustment function can be achieved during the test by adjusting the preload force of each constraint bolt 19. This facilitates the realistic reproduction of the constraint conditions of stiffened plate specimen 6 during the test and is beneficial for improving test accuracy.

[0078] It should be noted that the above describes the technical solutions in the embodiments of the present invention, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the scope of protection of the present invention.

Claims

1. A ship stiffener axial compression test device with adjustable boundary conditions, characterized in that: It includes a loading frame, a stiffened plate specimen, a clamping fixture, a boundary adjustment piece and an axial compression loading mechanism; The bottom of the loading frame is placed on the ground; The stiffened plate specimen is arranged vertically, the upper end of the stiffened plate specimen is connected to the loading frame, the lower end of the stiffened plate specimen is in contact with the upper end of the axial pressure loading mechanism, the upper end of the axial pressure loading mechanism is the driving end, and the axial pressure loading mechanism is arranged on the ground; There are two sets of clamping fixtures, which are respectively arranged on both sides of the stiffened plate specimen; the inner side of the clamping fixture is connected to the edge of the stiffened plate specimen through a boundary adjustment piece, the lower end of the clamping fixture is arranged on the base, and the upper end of the clamping fixture is connected to the loading frame; The clamping tool comprises a clamping body, a tool sleeve and a tool top plate; The clamping body includes an upper end plate, a lower end plate, and a first plate body and a second plate body that are vertically arranged between the upper end plate and the lower end plate and are perpendicular to each other; A first adjustment hole for connecting to a stiffened plate specimen is provided on a vertical edge of the first plate body; The stiffened plate specimen is a plate structure with a rib in the middle, and a plurality of second adjustment holes for connecting to the boundary adjustment pieces are provided at intervals along the height direction on both sides of the stiffened plate specimen; The boundary adjustment member includes a pressure plate and a restraining bolt; The pressing plate is provided with a third adjustment hole corresponding to the position of the first adjustment hole; the edge portions of the pressing plate and the clamping body are provided on both sides of the edge of the stiffened plate specimen, the third adjustment hole of the pressing plate, the second adjustment hole of the stiffened plate specimen and the first adjustment hole of the clamping body are adapted to each other, and the restraining bolt passes through the third adjustment hole, the second adjustment hole and the first adjustment hole in sequence to connect and fix the pressing plate, the stiffened plate specimen and the clamping body; the restraining bolt is also equipped with an annular pressure sensor; The ship stiffened plate axial compression test device adjusts different boundary constraints by means of constraint bolts arranged at different positions and in different quantities.

2. The ship stiffener axial compression test device according to claim 1, characterized in that: The loading frame includes loading portals on both sides and a loading beam connecting the upper parts of the two loading portals; the upper end of the stiffened plate specimen and the upper end of the clamping tool are both connected to the bottom of the loading beam.

3. The ship stiffener axial compression test device according to claim 2, characterized in that: The vertical edge of the clamping body is connected to the edge of the stiffened plate specimen through a boundary adjustment piece; The lower end of the clamping body is connected to the upper end of the tooling sleeve, which is arranged on the base; the upper end of the clamping body is connected to the tooling top plate arranged on the top of the loading frame through a tooling screw.

4. The ship stiffener axial compression test device according to claim 3, characterized in that: The lower end plate is connected to the upper end of the tooling sleeve, and the upper end plate is arranged on the lower surface of the loading beam and is connected to the tooling top plate through the tooling screw; the first plate body and the second plate body are connected by multiple triangular reinforcement plates arranged vertically at intervals.

5. The ship stiffener axial compression test device according to claim 4, characterized in that: The lower end of the stiffened plate specimen is connected to the load-sharing base, and the upper end of the stiffened plate specimen is connected to the fixing plate.

6. The ship stiffener axial compression test device according to claim 1, characterized in that: The first adjustment hole, the second adjustment hole and the third adjustment hole are all waist-round holes.

7. The ship stiffener axial compression test device according to claim 1, characterized in that: The axial pressure loading mechanism is a loading oil top, and the driving end of the axial pressure loading mechanism is located just below the bottom of the stiffened plate specimen.

8. The ship stiffener axial compression test device according to claim 7, characterized in that: The loading portal and loading beam are both steel structures welded from steel plates, wherein the loading portal includes a front flange plate, a rear flange plate and a portal web connecting the front and rear flange plates; the loading beam includes an upper flange plate, a lower flange plate and a beam web connecting the upper and lower flange plates, and the ends of the upper flange plate, lower flange plate and beam web of the loading beam are all connected to the portal web.

9. A method for testing axial compression of ship stiffened plates, characterized in that: Using the test device according to claim 8, the method comprises: Make reinforced plate specimens; The stiffened plate specimen is mounted on the ship stiffened plate axial compression test device, and the second adjustment holes on both sides of the stiffened plate specimen, the first adjustment hole on the clamping fixture, and the third adjustment hole on the pressure plate are positioned in a corresponding relationship, and the three are constrained together by restraining bolts, and the annular pressure sensor records the preload force provided by the restraining bolts; Tighten the restraining bolts on both sides of the stiffened plate specimen, and monitor and record the bolt preload at this time using an annular pressure sensor to ensure that the preload of each restraining bolt remains consistent. Start the axial compression loading mechanism arranged under the stiffened plate specimen to apply the set axial compression load to the stiffened plate specimen and maintain the load for the set time. During this process, the model strain / stress response data is recorded and stored. The axial compression load is removed and the constraints of the stiffened plate specimens by the constraint bolts are loosened, thus completing a loading test.

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