CN114383829A - Ultimate strength test device of key node structure - Google Patents
Ultimate strength test device of key node structure Download PDFInfo
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- CN114383829A CN114383829A CN202111532540.0A CN202111532540A CN114383829A CN 114383829 A CN114383829 A CN 114383829A CN 202111532540 A CN202111532540 A CN 202111532540A CN 114383829 A CN114383829 A CN 114383829A
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- 238000012360 testing method Methods 0.000 title claims abstract description 94
- 238000006073 displacement reaction Methods 0.000 claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims 1
- 238000004364 calculation method Methods 0.000 abstract description 9
- 230000006835 compression Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 abstract description 3
- 238000004088 simulation Methods 0.000 description 15
- 238000000034 method Methods 0.000 description 11
- 238000013461 design Methods 0.000 description 10
- 238000011160 research Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 2
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- 238000004519 manufacturing process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
Abstract
The invention discloses an ultimate strength testing device of a key node structure, which comprises a testing platform, wherein a main frame is arranged on the testing platform and comprises a plurality of main vertical beams and a plurality of main longitudinal beams, the main vertical beams and the main longitudinal beams form a space frame structure, a plurality of frames are arranged between the main longitudinal beams positioned at the upper side and the lower side, a supporting structure is arranged between the main vertical beams positioned at the front side and the rear side, a loading system is arranged on the supporting structure, the tail end of the loading system is connected with a test piece, the test piece sequentially penetrates through the frames, and the tail end of the test piece is arranged on the frames. The invention has compact structure, reasonable layout and convenient operation, applies compression load to the end part of the test model through the loading system, combines the force sensor and the displacement sensor, realizes the ultimate strength test of the key node structure, and provides powerful technical support for the calculation of the structural redundancy of the key node structure.
Description
Technical Field
The invention relates to an ultimate strength test device, in particular to an ultimate strength test device of a key node structure.
Background
In the field of ship and ocean engineering, structural redundancy is still a relatively new concept, and great progress space is provided for the research of redundancy. The reasonable selection of the redundancy can avoid the overlarge design scheme while ensuring the sufficient safety of the structural design of the ship body, and compared with the traditional allowable stress design method, the method can effectively reduce the weight of the whole ship. The ship structure is composed of plates, reinforcing ribs, plate lattices, trusses and a top-layer hull beam, the system works according to levels, the importance degree and the required safety level of each level are different, and the redundancy requirement of each part is also different. The key node is used for connecting parallel or serial hull components and is in key position in a hull structure system. The redundancy of the structure of the key node needs to be accurately obtained.
In recent years, numerical calculations have been advanced with the development of computing techniques, but the calculation time taken by the numerical calculation method, the accuracy of the obtained calculation results, and the like are closely related to the experience of the calculator. The investigation shows that different researchers aim at the same structure, the same boundary conditions and the same initial defects are adopted for calculation and analysis, and the difference of calculation results can reach 15-20%. By developing model test research, the collapse process of the hull structure under the action of corresponding load can be obtained, and the ultimate bearing capacity of the hull structure is revealed. For new ship types and new structure types, the model test method is the most fundamental and effective method for revealing the collapse mechanism and the ultimate strength of the ship structure.
In the prior art, a plurality of difficulties exist in equivalent design, processing, load application, boundary condition simulation and other work of a test model of the ultimate strength of a hull structure. The conventional ultimate strength test device only realizes the simulation of boundary conditions of regular or simple structures such as a stiffened plate structure, a cabin section structure and the like, but cannot ensure the simulation of multi-boundary conditions of a complex structure; due to the irregularity of the key node structure, the welding manufacturing difficulty is high, the design of a test device is complex, the simplification processing is often carried out, and the model test result is often in and out of a certain range from the actual condition; for the key node structure bearing the unidirectional load, due to the structural particularity, other structural sections except the loading end need to be subjected to boundary condition simulation, and the reality and the effectiveness of the boundary condition simulation are ensured.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide an ultimate strength test device of a key node structure, which solves the problems of multi-boundary condition simulation and loading of an ultimate strength test model of a complex multi-boundary structure.
The technical scheme is as follows: the test platform comprises a test platform, a main frame is arranged on the test platform and comprises a plurality of main vertical beams and a plurality of main longitudinal beams, the main vertical beams and the main longitudinal beams form a space frame structure, a plurality of frames are arranged between the main longitudinal beams positioned at the upper side and the lower side, a supporting structure is arranged between the main vertical beams positioned at the front side and the rear side, a loading system is arranged on the supporting structure, the tail end of the loading system is connected with a test piece, the test piece sequentially penetrates through the frames, and the tail end of the test piece is arranged on the frames.
The frame include first frame and second frame, first frame include first supporting beam, the upper and lower both ends of first supporting beam are connected with main vertical roof beam through the I-steel respectively, first horizontal roof beam is installed respectively at the upper and lower both ends between the first supporting beam, first vertical roof beam is installed respectively to both sides between the first horizontal roof beam.
The first vertical beam is positioned on the inner side of the first supporting beam.
And a space defined by the first transverse beam and the first vertical beam is used for penetrating through the test piece, so that simulation of a fixed constraint boundary condition is provided for the test piece.
The panel of first horizontal roof beam and first vertical roof beam all opens has a plurality of bolt holes, and passes through the fastener with the test piece and be connected, provides the simulation of fixed constraint boundary condition for the test piece.
The second frame include a second supporting beam, the upper and lower both ends of the second supporting beam are connected with the main longitudinal beam through I-steel respectively, the upper and lower both ends between the second supporting beam are installed with the horizontal roof beam of second respectively, be connected with the vertical roof beam of second between the horizontal roof beam of second of both sides.
The tail end of the test piece is installed on the second vertical beam through a fastener, and simulation of fixed constraint boundary conditions is achieved.
The loading system comprises a jack, the jack is connected with the test piece through a cushion block, a clamping groove is formed in one end, close to the jack, of the cushion block, an ejector rod of the jack extends into the clamping groove, displacement sensors are mounted at two ends of the clamping groove respectively, and a force sensor is connected between the jack and the supporting structure.
The jack outside cover have a first sleeve, force sensor outside cover have a second sleeve, restriction force sensor's lateral displacement.
The force sensor and the displacement sensor are both connected with a data acquisition system, and the data acquisition system is connected with the test host, so that data are transmitted to the test host.
Has the advantages that:
(1) the invention has compact structure, reasonable layout and convenient operation, applies compression load to the end part of the test model through the loading system, combines the force sensor and the displacement sensor, realizes the ultimate strength test of the key node structure, and provides powerful technical support for the calculation of the structural redundancy;
(2) the spatial steel structure design realizes the simulation of the multi-boundary condition of the key node structure, compared with the extreme strength test device of a stiffened plate structure or a cabin section structure, the device needs more materials, but the effective performance of the extreme strength test is ensured under the condition of not simplifying the key node structure, and the similarity of the model test result and the actual condition is improved;
(3) i-beams are arranged at the top and the bottom of the frame, and the force generated in the ultimate strength test process is transmitted to the upper and lower I-beams in the frame through the transverse beam of the frame, so that the size of the force transmitted to the main longitudinal beam is reduced, and the stability of the whole test device is improved;
(4) but the frame of back-and-forth movement and dismantlement, the hydraulic jack bearing structure that can reciprocate, the vertical roof beam that can remove about, guaranteed that this test device can be applicable to the ultimate strength test of different structural style, different yardstick key node structures, greatly helped in the research of passenger liner key node structure ultimate strength, especially ultimate strength research under the compressive load effect, also can extensively be used for the ultimate bearing capacity test of boats and ships and ocean engineering structure key node structure under the longitudinal compressive load effect.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic view of a first frame structure according to the present invention;
FIG. 4 is a schematic view of a second frame structure of the present invention;
FIG. 5 is a schematic structural diagram of a loading system according to the present invention;
FIG. 6 is a comparison graph of ultimate bearing capacity-displacement curves of key node structure tests and numerical simulations of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1 and 2, the invention comprises a test platform 1, a main frame is installed on the test platform 1, the main frame adopts a space frame structure consisting of four main vertical beams 2 and four main longitudinal beams 3, the test platform 1 is a steel platform, and the main vertical beams 2 and the main longitudinal beams 3 are respectively and rigidly connected with the test platform 1. The first frame 4 and the second frame 5 are arranged between the main longitudinal beams 3 positioned at the upper side and the lower side, the specific positions of the first frame 4 and the second frame 5 and the relative positions of the first frame 4 and the second frame 5 can be adjusted according to different key node structures, and even the number of the frames is increased. Be connected with bearing structure 6 between the main vertical roof beam 2 in left side, install loading system 7 on the bearing structure 6, loading system 7 end-to-end connection has test piece 8, and test piece 8 passes first frame 4 and second frame 5 in proper order, and its end is installed on second frame 5, and test piece 8 is parallel with test platform 1, and first frame 4 and second frame 5 provide the simulation of fixed restraint boundary condition for test piece 8.
As shown in fig. 3, the first frame 4 includes two first supporting beams 41, the upper and lower ends of the first supporting beams 41 are connected to the main longitudinal beam 3 through i-beams, and the force generated during the ultimate strength test is transmitted to the upper and lower i-beams through the first transverse beams 42, so that the force is reduced and transmitted to the main longitudinal beam, and the stability of the whole test apparatus is improved. A first horizontal roof beam 42 is installed respectively at the upper and lower both ends between two first supporting beam 41, and a first vertical roof beam 43 is installed respectively to the both sides between the first horizontal roof beam 42 of upper and lower both sides, and the first vertical roof beam 43 of both sides is located first supporting beam 41 inboard respectively, and the design is strengthened to first vertical roof beam 43, makes it possess sufficient intensity, guarantees the experimental precision of key node ultimate strength. The first transverse beam 42 and the first vertical beam 43 enclose a space for passing through the test piece 8. As shown in fig. 1, the web of the first support beam 41 is provided with bolt holes at equal intervals, and the first transverse beam 42 is fastened and connected with the web of the first support beam 41 through fasteners according to different test requirements. The first transverse beam 42 and the first vertical beam 43 are provided with bolt holes at equal intervals on the panel, and are connected with the test piece 8 through fasteners.
As shown in fig. 4, the second frame 5 includes two second supporting beams 51, the upper and lower ends of the second supporting beams 51 are connected to the main longitudinal beam 3 through i-beams, the upper and lower ends between the two second supporting beams 51 are respectively provided with a second transverse beam 52, the centers of the second transverse beams 52 on the upper and lower sides are connected to a second vertical beam 53, and the second vertical beam 53 is designed to be reinforced, so that the second vertical beam has sufficient strength, and the accuracy of the critical node ultimate strength test is ensured. The tail end of the test piece 8 is installed on the second vertical beam 53 through a fastener, and simulation of fixed constraint boundary conditions is achieved. The second transverse beam 52 and the second vertical beam 53 are provided with bolt holes distributed at equal intervals on the panel, and the second vertical beam 53 can be fastened and connected with the second transverse beam 52 through a fastener;
as shown in fig. 5, the loading system 7 includes a jack 71, the jack 71 is connected with the test piece 8 through a pad 74, one end of the pad 74 close to the jack 71 is provided with a slot 73, an ejector rod of the jack 71 extends into the slot 73, two ends of the slot 73 are respectively provided with a displacement sensor 75, a first sleeve 72 is sleeved outside the jack 71 to limit the lateral movement of the jack 71, a force sensor 77 is connected between the jack 71 and the supporting structure 6, a second sleeve 77 is sleeved outside the force sensor 77 to limit the lateral movement of the force sensor 77. The force sensor 76 and the displacement sensor 75 are connected with the data acquisition system 9 through transmission lines, so that the state of a key node test model in the test process is acquired in real time, and the data acquisition system 9 is connected with the test host 10, so that data are transmitted to the test host 10. In the loading process of the jack 71, the mandril of the jack firstly enters the clamping groove 73, so that the jack 71 cannot be eccentric and unstable due to gradual collapse of the structure during continuous loading. The test piece 8 is adhered with a one-way strain gauge and a strain rosette, and is connected to a strain acquisition instrument through a data line to observe the deformation and the main stress of the key position of the model.
In order to highlight the effect of the critical node ultimate strength test device, the passenger liner key node load-displacement curve obtained by the test device is compared with the passenger liner key node load-displacement curve obtained by a numerical simulation method at the same loading rate, and the specific result is shown in fig. 6. As can be seen from FIG. 6, the ultimate strength of the key node test model obtained by loading with the test device is 341677N, the ultimate strength of the finite element model obtained by using the numerical simulation method and the same loading rate is 355494N, and the error between the two is only 3.88%, so that the reliability of the test data is verified.
The design parameters such as ultimate strength of the key node structure are obtained based on model test, and are verified for many times in the test process, so that the reliability of test data is ensured, the method can be widely applied to ships and ocean engineering structures under the action of axial compression load, and reliable support is provided for redundancy design and optimization design of the ship and ocean engineering structures.
Claims (10)
1. The utility model provides a limit strength test device of key node structure, a serial communication port, includes test platform (1), test platform (1) on install the main frame, the main frame include many main vertical roof beams (2) and many main vertical roof beams (3), many main vertical roof beams (2) and many main vertical roof beams (3) constitute space frame structure, install a plurality of frames between main vertical roof beam (3) of both sides about being located, install bearing structure (6) between the main vertical roof beam (2) of front and back both sides, bearing structure (6) on install loading system (7), loading system (7) end-to-end connection have test piece (8), test piece (8) pass a plurality of frames in proper order, and test piece (8) end-to-end installation is on the frame.
2. The ultimate strength testing device of a key node structure according to claim 1, wherein the frame comprises a first frame (4) and a second frame (5), the first frame (4) comprises a first supporting beam (41), the upper end and the lower end of the first supporting beam (41) are connected with the main longitudinal beam (3) through I-steel, the upper end and the lower end between the first supporting beams (41) are provided with a first transverse beam (42), and two sides between the first transverse beams (42) are provided with a first vertical beam (43) respectively.
3. An ultimate strength testing device for a key node structure according to claim 2, characterized in that the first vertical beam (43) is located inside the first supporting beam (41).
4. The ultimate strength testing device for a key node structure according to claim 2, wherein the space defined by the first transverse beam (42) and the first vertical beam (43) is used for passing through the test piece (8).
5. The ultimate strength testing device for the key node structure is characterized in that a plurality of bolt holes are formed in the face plates of the first transverse beam (42) and the first vertical beam (43) and are connected with the test piece (8) through fasteners.
6. The ultimate strength testing device of a key node structure according to claim 2, wherein the second frame (5) comprises second supporting beams (51), the upper and lower ends of the second supporting beams (51) are respectively connected with the main longitudinal beam (3) through I-steel, second transverse beams (52) are respectively installed at the upper and lower ends between the second supporting beams (51), and second vertical beams (53) are connected between the second transverse beams (52) at both sides.
7. The ultimate strength testing device for a key node structure according to claim 1, wherein the end of the test piece (8) is mounted on the second vertical beam (53) by a fastener.
8. The ultimate strength testing device of a key node structure according to claim 1, wherein the loading system (7) comprises a jack (71), the jack (71) is connected with the test piece (8) through a cushion block (74), a clamping groove (73) is formed in one end, close to the jack, of the cushion block (74), an ejector rod of the jack (71) extends into the clamping groove (73), displacement sensors (75) are respectively installed at two ends of the clamping groove, and a force sensor (76) is connected between the jack and the supporting structure (6).
9. The ultimate strength testing device of a key node structure according to claim 8, wherein the jack (71) is sleeved with a first sleeve (72) and the force sensor (76) is sleeved with a second sleeve (77).
10. The ultimate strength testing device of a key node structure according to claim 8, wherein the force sensor (76) and the displacement sensor (75) are both connected with a data acquisition system (9), and the data acquisition system (9) is connected with a testing host (10).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111532540.0A CN114383829A (en) | 2021-12-15 | 2021-12-15 | Ultimate strength test device of key node structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111532540.0A CN114383829A (en) | 2021-12-15 | 2021-12-15 | Ultimate strength test device of key node structure |
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| CN114383829A true CN114383829A (en) | 2022-04-22 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2723551Y (en) * | 2004-07-13 | 2005-09-07 | 建研科技股份有限公司 | Frame beam and pole node reinforcing device |
| CN202661344U (en) * | 2012-06-14 | 2013-01-09 | 北京工业大学 | Horizontal loading test device for asymmetric-stiffness structure |
| CN106885745A (en) * | 2017-03-28 | 2017-06-23 | 武汉科技大学 | A kind of bean column node beam-ends loading test device and its method of testing |
| CN207300722U (en) * | 2017-11-01 | 2018-05-01 | 王正明 | A kind of bean column node Experimental Study on Seismic Behavior device |
| CN109297821A (en) * | 2018-12-04 | 2019-02-01 | 武汉理工大学 | A kind of simulation is compressed axially stiffened panel experimental rig |
| CN109489927A (en) * | 2018-11-30 | 2019-03-19 | 清华大学 | Anti-seismic performance test device and method after bean column node fire under long duration load |
| CN112629845A (en) * | 2020-12-21 | 2021-04-09 | 西南交通大学 | Strength test device of suspension frame framework of magnetic levitation vehicle |
-
2021
- 2021-12-15 CN CN202111532540.0A patent/CN114383829A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2723551Y (en) * | 2004-07-13 | 2005-09-07 | 建研科技股份有限公司 | Frame beam and pole node reinforcing device |
| CN202661344U (en) * | 2012-06-14 | 2013-01-09 | 北京工业大学 | Horizontal loading test device for asymmetric-stiffness structure |
| CN106885745A (en) * | 2017-03-28 | 2017-06-23 | 武汉科技大学 | A kind of bean column node beam-ends loading test device and its method of testing |
| CN207300722U (en) * | 2017-11-01 | 2018-05-01 | 王正明 | A kind of bean column node Experimental Study on Seismic Behavior device |
| CN109489927A (en) * | 2018-11-30 | 2019-03-19 | 清华大学 | Anti-seismic performance test device and method after bean column node fire under long duration load |
| CN109297821A (en) * | 2018-12-04 | 2019-02-01 | 武汉理工大学 | A kind of simulation is compressed axially stiffened panel experimental rig |
| CN112629845A (en) * | 2020-12-21 | 2021-04-09 | 西南交通大学 | Strength test device of suspension frame framework of magnetic levitation vehicle |
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