Boundary condition adjustable axial compression test device and method for ship stiffened plate

Abstract

The invention discloses a ship stiffened plate axial pressure test device with adjustable boundary conditions. The ship stiffened plate axial pressure test device comprises a loading frame, a stiffened plate test piece, a clamping tool, a boundary adjusting piece and an axial pressure 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 the stiffened plate test piece is connected with the loading frame, the lower end of the stiffened plate test piece is in contact with the upper end of the axial pressure loading mechanism, the upper end of the axial pressure loading mechanism is a driving end, and the axial pressure loading mechanism is arranged on the ground; the two groups of clamping tools are respectively arranged on two sides of the stiffened plate test piece; the inner side edge of the clamping tool is connected with the edge part of the stiffened plate test piece through a boundary adjusting piece, the lower end of the clamping tool is arranged on the base, and the upper end of the clamping tool is connected with the loading frame. The device has the advantages that the boundaries on the two sides of the stiffened plate test piece are connected with the clamping tool through the boundary adjusting pieces, the boundary conditions of the stiffened plate test piece can be adjusted according to the boundary adjusting pieces, and the accuracy of the test result 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] The stiffened plate structure is a basic component unit on the ship and is widely used as a research object for the bearing capacity of the ship structure. Its bearing capacity and characteristics are of great significance for evaluating the safety and reliability of the ship. When the ship is bent by the action of waves during navigation, the stiffened plates in the ship structure will be subjected to repeated tensile and compressive loads. Since the thickness of the stiffened plate structure of the ship is generally thin, stability failure under compression load is a common form of failure of the stiffened plate structure, which should attract the attention of designers.

[0003] The axial compression loading strength test of the ship stiffened plate structure (hereinafter referred to as the 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, the 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 constraints, 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 stiffened plate axial compression test device and method with adjustable boundary conditions in view of the deficiencies in the prior art, 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; 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 groups of clamping fixtures, which are 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.

[0006] 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.

[0007] According to the above scheme, the clamping tool comprises a clamping body, a tool sleeve and a tool top plate; The vertical edge of the clamping body is connected to the edge of the stiffened plate specimen through a boundary adjustment member; 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.

[0008] 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 that are vertically arranged and perpendicular to each other and are located 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; a first adjustment hole is provided on the vertical edge of the first plate body for connecting to a stiffened plate specimen.

[0009] According to the above scheme, the stiffened plate specimen is a plate structure with ribs in the middle, and the two side edges of the stiffened plate specimen are provided with a plurality of second adjustment holes for connecting with the boundary adjustment member 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.

[0010] According to the above scheme, the boundary adjustment member includes a pressure plate and a restraining bolt; A third adjustment hole corresponding to the position of the first adjustment hole is opened on the pressure plate; the edge portions of the pressure plate and the clamping body are arranged on both sides of the edge portions 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 configured with a hole pressure sensor.

[0011] According to the above solution, the first adjustment hole, the second adjustment hole and the third adjustment hole are all oval holes.

[0012] 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 directly below the bottom of the stiffened plate specimen.

[0013] 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.

[0014] The present invention also discloses a method for testing the axial compression of a ship stiffened plate, using the test device as described above, the method comprising: Make reinforced plate specimens; The stiffened plate specimen is installed on the ship stiffened plate axial compression test device, the second adjustment holes on both sides of the stiffened plate specimen, the first adjustment holes on the clamping fixture, and the third adjustment holes on the pressure plate form a position correspondence relationship, and the three are constrained together by the constraint bolts, and the annular pressure sensor records the preload force provided by the constraint bolts; Tighten the restraining bolts arranged on both sides of the stiffened plate specimen, and monitor and record the bolt preload at this time through the annular pressure sensor to keep the preload of each restraining bolt consistent; Start the axial compression loading mechanism arranged under the stiffened plate specimen, apply a set axial compression load to the stiffened plate specimen, and maintain the load for a set time, and record and store the model strain / stress response data during this process; The axial compression load is removed and the constraints of the stiffened plate specimen by each constraint bolt are loosened, thus completing a loading test.

[0015] The beneficial effects of the present invention are: 1) The present invention uses boundary adjustment pieces 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 pieces, thereby realizing the adjustment of the boundary conditions and obtaining boundary conditions that are closer to the actual state. Compared with the prior art, the accuracy of the test results is greatly improved.

[0016] 2) In the present invention, the boundary condition can be estimated based on the bolt preload obtained by the central 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.

[0017] 3) The clamping fixture of the present invention can adjust the position through the margin between the screws, and the base can adjust the position through the waist-round slot hole, which can be suitable for loading frames and stiffened plate specimens of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an overall schematic diagram of Embodiment 1 of the present invention.

[0019] Figure 2 Schematic diagram of the clamping fixture.

[0020] Figure 3 Schematic diagram of the stiffened plate specimen.

[0021] Figure 4 A schematic diagram of the base.

[0022] Figure 5 Schematic diagram of the pressure plate.

[0023] Figure 6 Schematic diagram of the connection between the boundary adjustment part and the clamping fixture, pressure plate and stiffened plate specimen.

[0024] Figure 7 This is a diagram of the equipment used in the actual testing process of No. 2 Middle School.

[0025] Figure 8 This is the stress cloud diagram of the stiffened plate specimen during the test of Example 2.

[0026] Fig. 9 This is the stress cloud diagram of the stiffened plate specimen during the comparative test.

[0027] Fig.10 It is the target stress cloud diagram of the stiffened plate specimen.

[0028] Among them: 1. Loading gantry; 2. Loading beam; 3. Clamping tool; 3.1. First plate body; 3.2. Second plate body; 3.3. Third plate body; 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

[0029] 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 examples.

[0030] like Figure 1 A ship stiffened plate axial compression test device with adjustable boundary conditions is shown, comprising a loading frame, a stiffened plate specimen 6, a clamping fixture 3, a boundary adjustment member 8 and an axial compression loading mechanism; The bottom of the loading frame is placed on the ground; The stiffened plate specimen 6 is arranged vertically, the upper end of the stiffened plate specimen 6 is connected to the loading frame, the lower end of the stiffened plate specimen 6 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 groups of clamping fixtures 3, which are arranged on both sides of the stiffened plate specimen 6; the inner side edge of the clamping fixture 3 is connected to the edge of the stiffened plate specimen 6 through the boundary adjustment piece 8, the lower end of the clamping fixture 3 is arranged on the base 4, and the upper end of the clamping fixture 3 is connected to the loading frame.

[0031] In the present invention, the axial pressure loading mechanism and the base 4 are both arranged on the ground; the axial pressure loading mechanism can be a loading oil top 7, and the driving end (i.e., the upper end) of the axial pressure loading mechanism is located just below the bottom of the stiffened plate specimen 6, so as to apply a uniform axial pressure load to the stiffened plate specimen 6. The clamping fixture 3 is arranged on both sides of the stiffened plate specimen 6, and is connected to the loading frame at the top and to the base 4 at the bottom, so as to realize the constrained positioning of the clamping fixture 3.

[0032] Preferably, the loading frame includes loading gantries 1 on both sides and a loading beam 2 connecting the upper parts of the two loading gantries 1 ; the upper end of the stiffened plate specimen 6 and the upper end of the clamping tool 3 are both connected to the bottom of the loading beam 2 .

[0033] In the present invention, the loading portal frame 1 and the loading beam 2 are both steel structures welded from steel plates, wherein the loading portal frame 1 includes a front flange plate, a rear flange plate and a portal frame web connecting the front and rear flange plates; the loading beam 2 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 2 are all connected to the portal web; holes are opened on each plate body for bolt connection between various tooling components and test pieces.

[0034] Preferably, the clamping tool 3 comprises a clamping body, a tool sleeve 9 and a tool top plate 11; The vertical edge of the clamping body is connected to the edge of the stiffened plate specimen 6 through a boundary adjustment member 8; The lower end of the clamping body is connected to the upper end of the tooling sleeve 9, which is arranged on the base 4; the upper end of the clamping body is connected to the tooling top plate 11 arranged on the top of the loading frame (specifically the loading beam 2) through the tooling screw 10.

[0035] 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 limiting of the clamping body.

[0036] 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 that are vertically arranged and perpendicular to each other and are located 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 a tooling screw 10; the first plate body 3.1 and the second plate body 3.2 are connected through a plurality of triangular reinforcement plates 3.4 that are vertically spaced apart; 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.

[0037] In the present invention, a first adjustment hole 12 is provided on the inner edge of the first plate body 3.1 and 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; 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.

[0038] Preferably, the stiffened plate specimen 6 is a plate structure with ribs in the middle, and the two side edges of the stiffened plate specimen 6 are provided with a plurality of second adjustment holes 14 for connecting with the boundary adjustment member 8 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.

[0039] In the present invention, the bottom of the stiffened plate specimen 6 is connected to the upper end of the axial pressure loading mechanism through a load-sharing base 15, and the load-sharing base 15 converts the load applied by the axial pressure loading mechanism into a uniformly distributed axial pressure load; the top of the stiffened plate specimen 6 is connected to the loading beam 2 through a fixing plate 13.

[0040] Preferably, the boundary adjustment member 8 comprises a pressure plate 5 and a restraining bolt 19; The pressing plate 5 is provided with a third adjustment hole 18 corresponding to the position of the first adjustment hole 12; the edge portions of the pressing plate 5 and the clamping body are arranged at the front and rear sides of the edge portions of the stiffened plate specimen 6, the third adjustment hole 18 of the pressing plate 5, the second adjustment hole 14 of the stiffened plate specimen 6 and the first adjustment hole 12 of the clamping body are adapted to each other, and 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 fix the pressing plate 5, the stiffened plate specimen 6 and the clamping body; the restraining bolt 19 is also provided with a hole pressure sensor 20, and the bolt preload of the restraining bolt 19 can be obtained by testing 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 oval holes.

[0041] Embodiment 1 like Figure 1The shown device is a ship stiffened plate axial compression test device with adjustable boundary conditions, comprising a loading frame composed 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; a clamping fixture 3 is arranged on the left and right sides of the stiffened plate specimen 6, and is connected to the loading beam 2 at the top and to the base 4 at the bottom, so as 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 so as to apply a uniformly distributed axial compression load.

[0042] 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 the loading beam 2 with different sizes in the 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.

[0043] like Figure 3 The stiffened plate specimen 6 shown, the fixed plate 13 at the upper end of the stiffened plate specimen 6 is used to connect with the loading beam 2, and the load-sharing base 15 at the lower end is used to convert the load of the loading oil top 7 into a uniformly distributed axial compression load; the second adjustment holes 14 on the two side edges of the stiffened plate specimen 6 are used to constrain the positioning of the bolts 19.

[0044] like Figure 4 The base 4 has a limiting cylinder 16 fixed 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 and positioning the clamping tool 3. This connection method does not require precise matching of the clamping tool 3 and the base 4 in size, and is more convenient for assembly in actual tests.

[0045] 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, and the constraining bolt 19 passes 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 in sequence, connecting the three as a whole. A greater bolt preload means that the stiffened plate specimen 6 is subjected to a stronger boundary constraint at this time. The bolt preload data of the constraining bolt 19 can be obtained by testing the annular pressure sensor 20. In addition to adjusting the bolt preload of the constraining bolt 19, different boundary constraints can also be achieved by arranging the position and number of the constraining bolts 19, and the adjustment is more flexible.

[0046] Implementation II This embodiment uses the device described in the first embodiment 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 mainly subjected to axial compression loads from the total longitudinal bending of the ship. A method for axial compression testing of a stiffened plate of a ship, the method comprising: Step 1: Make a stiffened plate specimen 6. The stiffened plate specimen 6 is a target stiffened plate structure that has been reasonably scaled down to ensure that its mechanical properties are consistent with the prototype; the stiffened plate specimen 6 in this embodiment has a length a of 1050 mm, a width b of 350 mm, a plate thickness of 4 mm, and is made of AH36 marine high-strength structural steel.

[0047] Step 2: Install the stiffened plate specimen 6 on the above-mentioned ship stiffened plate axial compression test device. The specific installation method is: The stiffened plate specimen 6 is connected to the loading beam 2, and the two sides of the stiffened plate specimen 6 are matched with the clamping fixture 3 and the boundary adjustment member 8. The second adjustment holes 14 (i.e., oval 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 position correspondence, and the three 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 oval 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.

[0048] 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 make the preload force of each constraint bolt 19 consistent.

[0049] 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 loading for a set time, and record and store the model strain / stress response data during this process.

[0050] Step 5: Slowly remove the axial compression load and loosen the constraints of the restraining bolts 19 on the stiffened plate specimen 6, thus completing a loading test.

[0051] If a second loading test is required, try tightening each restraining bolt 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.

[0052] Comparative Example In this comparative example, the existing tooling (such as described in CN109297821B) is used to perform an axial compression loading test on the same stiffened plate specimen 6.

[0053] Figure 8 and Fig. 9 The stress cloud diagrams of the stiffened plate specimen 6 in Example 2 and Comparative Example are shown in sequence. Fig.10 is the target stress cloud diagram of the stiffened plate specimen, obtained by using the 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 ( Fig.10 ) is close, while the stress cloud diagram of the traditional tooling technology result ( Fig. 9 ) is the same as the target cloud map ( Fig.10 ), which shows that the test results of the present invention are closer to the actual situation and have higher reliability.

[0054] The boundary constraint provided by the present invention for the ship stiffened plate model is actually an elastic boundary constraint between full fixation and full freedom, which is more in line with the boundary constraint effect of the stiffened plate in the actual ship structure. In view of the situation where the stiffened plate specimen 6 is subject to different degrees of constraint, the boundary adjustment function in the test process can be achieved by adjusting the preload of each constraint bolt 19, which is conducive to truly reproducing the constraint condition of the stiffened plate specimen 6 in the test, and has a beneficial value for improving the accuracy of the test.

[0055] 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 belong to the protection scope of the present invention.

Claims

1. A ship stiffened plate 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 pressure 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 groups of clamping fixtures, which are 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.

2. The ship stiffened plate 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 fixture are both connected to the bottom of the loading beam.

3. The ship stiffened plate axial compression test device according to claim 2, characterized in that: The clamping tool comprises a clamping body, a tool sleeve and a tool top plate; The vertical edge of the clamping body is connected to the edge of the stiffened plate specimen through a boundary adjustment member; 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.

4. The ship stiffened plate axial compression test device according to claim 3, characterized in that: 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; a first adjustment hole for connecting to a stiffened plate specimen is provided on the vertical edge of the first plate body.

5. The ship stiffened plate axial compression test device according to claim 4, characterized in that: 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 at intervals along the height direction on both side edges of the stiffened plate specimen; 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.

6. The ship stiffened plate axial compression test device according to claim 5, characterized in that: The boundary adjustment member includes a pressure plate and a restraining bolt; A third adjustment hole corresponding to the position of the first adjustment hole is opened on the pressure plate; the edge portions of the pressure plate and the clamping body are arranged on both sides of the edge portions 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 configured with a hole pressure sensor.

7. The ship stiffened plate axial compression test device according to claim 6, characterized in that: The first adjustment hole, the second adjustment hole and the third adjustment hole are all oval holes.

8. The ship stiffened plate axial compression test device according to claim 7, 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 directly below the bottom of the stiffened plate specimen.

9. The ship stiffened plate 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, the lower flange plate and the beam web of the loading beam are all connected to the portal web.

10. A method for testing axial compression of ship stiffened plates, characterized in that: Using the test device according to claim 6, the method comprises: Make reinforced plate specimens; The stiffened plate specimen is installed on the ship stiffened plate axial compression test device, the second adjustment holes on both sides of the stiffened plate specimen, the first adjustment holes on the clamping fixture, and the third adjustment holes on the pressure plate form a position correspondence relationship, and the three are constrained together by the constraint bolts, and the annular pressure sensor records the preload force provided by the constraint bolts; Tighten the restraining bolts arranged on both sides of the stiffened plate specimen, and monitor and record the bolt preload at this time through the annular pressure sensor to keep the preload of each restraining bolt consistent; Start the axial compression loading mechanism arranged under the stiffened plate specimen, apply a set axial compression load to the stiffened plate specimen, and maintain the load for a set time, and record and store the model strain / stress response data during this process; The axial compression load is removed and the constraints of the stiffened plate specimen by each constraint bolt are loosened, thus completing a loading test.

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