CN115659507A - Test method for deck nonlinear response test under loading action of landing pad - Google Patents
Test method for deck nonlinear response test under loading action of landing pad Download PDFInfo
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Abstract
The invention discloses a deck nonlinear response test method under the loading action of a landing pad, which comprises the following specific steps: constructing a deck local finite element model; constructing a landing pad finite element model; carrying out nonlinear contact finite element analysis between the deck and the landing pad; constructing a test tool; constructing a test system and arranging sensors; selecting working conditions and performing model test; collecting and processing test data; comparing and analyzing the numerical simulation result and the test result, and correcting the numerical model. The testing method of the invention provides a testing scheme of deck nonlinear mechanical behavior under the action of landing pad load, and can quickly and effectively test the structural responses of the products, such as contact pressure distribution, deck stress distribution, deck deformation and the like. The method overcomes the limitation of higher requirements on test sites, test objects, test personnel and the like in the test process of the prototype structure. The method provides theoretical basis for exploring deck nonlinear response under the action of landing pad load and perfecting related specifications.
Description
Technical Field
The invention belongs to the field of mechanical manufacturing and structural mechanics, and particularly relates to a deck nonlinear response test method under the loading action of a landing pad.
Background
Decks are important load-bearing members in ship structures, and some decks are required to be loaded with not only goods and materials but also hovercraft. The design of the structures of the deck that are subjected to such special loads (hovercraft bottom landing pads) is an important issue. At present, the specifications of the classification society in China do not clearly relate to design guidelines and strength check balancing specifications of a hull deck structure under the action of a landing pad, and at present, the strength research of the deck structure bearing the load is rarely related at home and abroad.
The load acts on the deck through the landing pad at the bottom of the hovercraft, and compared with the traditional wheel mark load, the landing pad has more complex load structure and higher material rigidity, so that the nonlinear contact between the landing pad and the deck is more complex. The landing pad is welded at the bottom of the hovercraft, the hovercraft is large in size and rigidity, the nonlinear contact response measurement condition of the landing pad and a deck of the real ship is limited, and the real situation is difficult to simulate by a reduced scale model experiment.
Disclosure of Invention
In order to solve the problems, the invention provides a test method for a deck nonlinear response test under the loading action of a landing pad, which is used for researching the deck nonlinear response under the loading action of the landing pad and providing a theoretical basis for the perfection of the design specification of a related deck.
In order to achieve the aim, the invention provides a deck nonlinear response test method under the loading action of a landing pad, which comprises the following steps:
s1: constructing a deck local finite element model;
s2: constructing a landing pad finite element model;
s3: performing nonlinear contact finite element analysis between the deck and the landing pad based on the deck local finite element model and the landing pad finite element model;
s4: constructing a test tool based on the result of the nonlinear contact finite element analysis;
s5: constructing a test system and arranging sensors based on the constructed test tool;
s6: selecting working conditions based on the constructed test system and the arranged sensors, and performing model test based on the selected working conditions;
s7: collecting and processing test data of the model test;
s8: and comparing the numerical simulation result obtained by the nonlinear contact finite element analysis with the processed test result, and correcting the numerical model.
Preferably, the method for constructing the deck local finite element model in S1 includes: the finite element model of the deck is constructed by adopting a quadrilateral plate unit, wherein the finite element model of the deck consists of a deck plate, a cross beam and a longitudinal bone.
Preferably, the method for constructing the finite element model of the landing pad in S2 includes: the landing pad is constructed by combining quadrilateral plate units and triangular plate units, wherein the landing pad finite element model is of a wedge-shaped structure and consists of a bottom plate, side plates, a top plate, longitudinal ribs and a cross beam.
Preferably, in S3, the method for performing nonlinear contact finite element analysis between the deck and the landing pad includes: the deck plate is a contact main surface, the landing pad bottom plate is a contact slave surface, the normal contact property is hard contact, and the tangential contact property is a coulomb friction model.
Preferably, the method for constructing the test tool in S4 includes: the landing pad load is applied by adopting a hydraulic oil cylinder loading mode;
the specific process is as follows: arranging an auxiliary loading component to be connected with the landing pad by adopting a bolt, wherein the auxiliary loading component covers a top plate of the landing pad; the oil cylinder pressure head is connected with the auxiliary loading component by a flange; the whole test model is fixed on the reaction frame through the bottom pier.
Preferably, the method for constructing the test system in S5 includes: the input variable of the test system is an external load provided by the test tool, and the output variable of the test system is deck contact pressure, deck stress distribution and deck deformation;
the method for arranging the sensors in the S5 comprises the following steps: the pressure sensor is arranged between the deck and the landing pad, and the strain gauge and the displacement sensor are uniformly arranged on the lower surface of the deck plate and the longitudinal beam.
Preferably, the selection method of the working condition in S6 includes: selecting research working conditions according to the relative positions of the center of the bottom of the landing pad, the deck beam and the deck longitudinal frame; the landing pad moves longitudinally relative to the deck at fixed intervals, and the most dangerous working condition is obtained through testing;
the method for carrying out model test based on the deck local finite element model and the landing pad finite element model in the S6 comprises the following steps: and loading the top of the landing pad by adopting double oil cylinders, wherein the positions of the double oil cylinders are symmetrical about the center of the bottom of the landing pad, acquiring the elongation of the oil cylinder pressure head by adopting a stay wire type displacement meter, finely adjusting the load of each oil cylinder to keep the elongation of each oil cylinder pressure head consistent, recording the load of each oil cylinder, and recording the sum of the loads of each oil cylinder as the load of the landing pad.
Preferably, the method for collecting and processing the test data of the model test in S7 is as follows: and acquiring measurement data of the sensor through a data acquisition instrument, and acquiring deck pressure distribution and stress distribution based on the measurement data.
Preferably, the test result in S8 is compared with the numerical simulation result, the numerical simulation result is corrected according to the test result, and a more effective numerical model is constructed to realize the exploration of the deck structure response under more complex working conditions.
Compared with the prior art, the invention has the following advantages and technical effects:
1) The test method for the deck nonlinear response test under the action of the landing pad load accurately obtains the landing pad load distribution and the deck response, and provides a theoretical basis for the perfection of each specification.
2) The deck nonlinear response test method under the loading action of the landing pad provided by the invention provides sufficient data support for constructing a more reasonable nonlinear contact finite element model between the landing pad and the deck. The constructed numerical model can be used as an effective tool to simulate the nonlinear response of the deck.
3) The method for testing the deck nonlinear response test under the action of the landing pad load can realize the adjustment of the relative position of the landing pad and the deck and the adjustment of the load of the landing pad in the test process, has strong test functionality and can ensure the test precision.
4) The deck nonlinear response test method under the loading effect of the landing pad provided by the invention provides feasible schemes for testing the deck pressure distribution, the deck stress distribution, the deck deformation and the like, and the double-oil-cylinder simultaneous loading is adopted, so that the defect that the conventional test device is difficult to restrain the deflection of the landing pad can be effectively overcome. The auxiliary loading component is adopted, so that the problem of uniform distribution of the top load of the landing pad can be well solved.
5) The deck mechanical characteristics under the load of the landing pad are researched by constructing a local model of the deck and the landing pad under the laboratory condition, so that the limitation to a test field, a test object, a tester and the like in a prototype structure test can be effectively reduced, and the deck mechanical behavior can be researched more flexibly, accurately and effectively.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the application, and the description of the exemplary embodiments of the application are intended to be illustrative of the application and are not intended to limit the application. In the drawings:
FIG. 1 is a schematic flow chart of a test method for a deck nonlinear response test under the loading action of a landing pad according to the present invention;
FIG. 2 is a layout diagram of a landing pad loading deck model test of a deck nonlinear response test method under the loading action of a landing pad of the present invention;
FIG. 3 is a schematic view of a partial deck model of a testing method for a deck nonlinear response test under the loading action of a landing pad according to the present invention;
fig. 4 is a schematic view of a landing pad model of a deck nonlinear response test method under the loading action of the landing pad of the present invention.
Description of the drawings: (1) -reaction frame, (2) -deck model, (3) -pier, (4) -loading flange, (5) -oil cylinder, (6) -stay wire type displacement sensor, (7) -auxiliary loading member, (8) -landing pad model.
Detailed Description
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than here.
As shown in fig. 1-4, the invention provides a test method for a deck nonlinear response test under the loading action of a landing pad, which comprises the following steps:
s1: constructing a deck local finite element model;
s2: constructing a landing pad finite element model;
s3: performing nonlinear contact finite element analysis between the deck and the landing pad based on the deck local finite element model and the landing pad finite element model;
s4: constructing a test tool based on the result of nonlinear contact finite element analysis;
s5: constructing a test system and arranging sensors based on the constructed test tool;
s6: selecting working conditions based on the constructed test system and the arranged sensors, and performing model test based on the selected working conditions;
s7: collecting and processing test data of the model test;
s8: and comparing the numerical simulation result obtained by the nonlinear contact finite element analysis with the processed test result, and correcting the numerical model.
Specifically, in the step S1, a deck finite element model is established, a deck structure is composed of deck plates, beams and longitudinal ribs, the deck finite element model is mainly constructed by adopting quadrilateral plate units, the size of a grid is 10-20 mm, and the minimum longitudinal range and the minimum transverse range of the deck are obtained through finite element analysis.
Specifically, the landing pad finite element model is established in S2 and consists of a bottom plate, side plates, a top plate, longitudinal ribs and a cross beam, the landing pad finite element model is constructed by combining quadrilateral and triangular plate units, the size of a grid is 10-20 mm, and the top plate is added to facilitate loading and simulate the very high rigidity of the top of the landing pad.
Specifically, the method for performing nonlinear contact finite element analysis between the deck and the landing pad in S3 comprises the following steps: the deck plate is a contact main surface, the landing pad bottom plate is a contact slave surface, the normal contact property is hard contact, and the tangential contact property is a coulomb friction model. Establishing a reference point at a top plate position corresponding to the center of the bottom of the landing pad, coupling the reference point with all top plate nodes, applying load and constraint conditions on the reference point, and limiting all degrees of freedom of the reference point except vertical displacement.
Specifically, the method for constructing the test tool in the S4 comprises the following steps: the landing pad load is applied by adopting a hydraulic oil cylinder loading mode;
the specific process is as follows: the rigidity of the top of the landing pad is high, the landing pad does not deflect and only has vertical degree of freedom, so that an auxiliary loading member is arranged to be connected with the landing pad through a bolt, and the auxiliary loading member covers the top plate of the landing pad; the oil cylinder pressure head is connected with the auxiliary loading component by a flange; the whole test model is fixed on the reaction frame through the bottom pier, wherein the whole test model is a test model entity.
Specifically, the method for constructing the test system in S5 includes: the input variable of the test system is an external load provided by the test tool, and the output variable of the test system is deck contact pressure, deck stress distribution and deck deformation;
the method for arranging the sensors in the S5 comprises the following steps: the pressure sensor is arranged between the deck and the landing pad, and the strain gauge and the displacement sensor are uniformly arranged on the lower surface of the deck plate and the longitudinal beam.
Specifically, the selection method of the working condition in the S6 includes: selecting research working conditions according to the relative positions of the center of the bottom of the landing pad, the deck beam and the deck longitudinal frame; the landing pad longitudinally moves relative to the deck at fixed intervals, and the most dangerous working condition is obtained through testing;
the method for carrying out model test based on the deck local finite element model and the landing pad finite element model in the S6 comprises the following steps: and loading the top of the landing pad by adopting double oil cylinders, wherein the positions of the double oil cylinders are symmetrical about the center of the bottom of the landing pad, acquiring the elongation of an oil cylinder pressure head by adopting a stay wire type displacement meter, finely adjusting the load of each oil cylinder to keep the elongation of each oil cylinder pressure head consistent (the error is less than 0.5 mm), recording the load of each oil cylinder, and recording the sum of the loads of the oil cylinders as the load of the landing pad.
Specifically, the method for collecting and processing the test data of the model test in S7 includes: and acquiring measurement data of the sensor through a data acquisition instrument, and acquiring deck pressure distribution and stress distribution based on the measurement data.
Specifically, the test result in S8 is compared with the numerical simulation result, the numerical simulation result is corrected through the test result, and a more effective numerical model is constructed to realize the exploration of the deck structure response under more complex working conditions.
In this embodiment: the non-linear contact response test is carried out by taking a landing pad of a certain hovercraft and a deck of a certain hovercraft as examples.
1. Determining the longitudinal and transverse ranges of the deck, and establishing a local deck finite element model. The most common stiffened plate structure is selected as a research object, a deck model is composed of deck plates, longitudinal beams and cross beams, modeling calculation is carried out within a local plate frame range, the distance between the longitudinal beams is 600mm, the distance between the cross beams is 2400mm, and the specific size is shown in the test deck model size in table 1. In order to improve the accuracy of the contact calculation result, the deck model is also completely simulated by the S4R plate unit, all quadrilateral units are adopted, the size of the basic grid is about 10mm, and the deck material is steel.
TABLE 1
| Name of structure | Structural dimension/ |
| Deck plate | |
| 8 | |
| Longitudinal bone | T14 |
| Cross beam | T section bar: 300X 10/180X 14 |
And analyzing the influence of the deck model range on the research target according to finite element calculation. And obtaining the minimum deck range which does not influence the calculation result so as to achieve the aim of reducing the modeling and calculation workload. Firstly, the longitudinal range of the deck is researched, the transverse range is fixed, two models of 1/2+ 1/2 span (four span) and 1/2+ 1/2 span (three span) are respectively established in the longitudinal range, the two models are the deck stress at the front end of the bottom of the landing pad or the overall displacement amplitude of the deck, and the error of the two models is basically smaller than 2%. The 1/2+ 1/2 cross-mode shape selected in the longitudinal range meets the requirement. The transverse range is restrained by the span of the reaction frame, and the transverse range of the deck is three longitudinal bone intervals.
For auxiliary test, a coaming is additionally arranged around the deck structure, and the thickness of the plate is 10mm. In order to achieve the purposes of keeping the boundary of the test stable in the loading process, facilitating the test and the like, a panel is additionally arranged at the bottom of the coaming, and the thickness of the panel is 16mm.
2. The landing pad structure is a local component welded at the bottom of the hovercraft, and the landing pad model completes finite element modeling according to the existing structural diagram. The landing pad structure is an aluminum alloy box-type structure, the front end of the landing pad is wedge-shaped, and the inner structure mainly comprises a bottom plate, side plates, longitudinal and transverse partition plates, a cross beam and longitudinal ribs. The landing pad structure has a length of 2800mm at the bottom and a width of 600mm, and the specific dimensions are shown in table 2. In order to achieve accuracy of a contact calculation result, a finite element model of the landing pad is modeled by using S4R plate units, the structure of a main body part is regular, quadrilateral units are mainly adopted, the size of a basic grid is about 10mm, and a part of triangular units are adopted for combined modeling on a wedge-shaped structure at the front end of the landing pad and a curved surface part of a bottom fillet, so that requirements are met. The landing pad is located the hovercraft bottom, and with hovercraft bottom rigid connection, so landing pad top rigidity is very big, in order to simulate this effect, simultaneously in order to exert load and set up the constraint condition in the contact analysis in the convenience, increases the roof structure at the landing pad top, and this roof just in time covers the outer profile of landing pad top.
TABLE 2
| Baseboard (mm) | Side board (mm) | Longitudinal clapboard (mm) | Diaphragm plate (mm) |
| 6 | 4 | 3 | 5 |
3. Establishing a nonlinear contact calculation model between the landing pad and the deck, and assembling the deck model and the landing pad model together, wherein the landing pad placement direction is along the deck longitudinal bone direction, and the longitudinal and transverse relative positions of the landing pad and the deck are changed to realize different placement working conditions. Establishing a contact pair between the bottom of the landing pad and a deck plate, wherein the deck plate is selected as the main contact surface because the deck plate has higher rigidity compared with the landing pad, and only the deck plate near the landing pad is used as the main contact surface in consideration of improving convergence and simplifying calculation amount; the contact area is selected to be the area that the bottom plate and the surrounding side plates of the landing pad may contact. And the size of the finite element model of the deck is similar to that of the finite element model of the landing pad, and the selection of the contact surface meets the requirement of contact on definition. The contact attributes of the master and slave surfaces used by the computational model are defined as follows: the normal action is defined as "hard contact" and the tangential direction uses the Coulomb friction model (Coulomb friction model). The friction coefficient is the friction coefficient between two materials of the landing pad and the deck, and the friction coefficient between the deck and the landing pad is defined to be 0.45 in consideration of the influence of the deck coating material.
The top and bottom areas of the landing pad are different, and in order to ensure that the action line of the resultant force of the load applied to the top of the landing pad passes through the center of the bottom, the processing method comprises the following steps: and setting a reference point A at the position, corresponding to the top plate, of the center of the bottom of the landing pad, coupling all nodes on the top plate with the reference point A, and applying a load on the reference point A. The four landing pads are positioned at the bottom of the hovercraft, so that the rigidity of the top of the landing pad is high, and the landing pads cannot deflect left, right, front and back due to the constraint of the hovercraft, so that the landing pads can only move vertically, namely, the landing pads only have Z-direction freedom. The landing pad upper surface coupling constraint requirements are given in table 3.
TABLE 3
4. Because the landing pad is built by adopting the aluminum alloy material, the landing pad is softer than steel, if the oil cylinder pressure head is directly used for loading, the top structure of the landing pad can be locally damaged, so that an auxiliary loading component is adopted in the test, is of a box-type steel structure and just completely covers the top plate of the landing pad. The landing pad is connected with the auxiliary loading component through bolts, and the auxiliary loading component has the functions of enabling the oil cylinder pressure head to be loaded on the landing pad for uniform load distribution and simultaneously restraining the deflection of the landing pad. The arrangement positions of the oil cylinder pressure heads are symmetrical relative to the center of the bottom of the landing pad, so that the action line of the resultant force of the load applied to the top of the landing pad is better ensured to pass through the center of the bottom. The bottom of the test deck is supported by 8 piers, and the deck is connected with the piers through bolts.
In order to research the pressure distribution of the deck and the stress distribution law of the deck under different working conditions. In the test, the contact force of the deck under different working conditions and the stress and displacement of corresponding measuring points of the deck plate grids, the longitudinal beams and the strong cross beams need to be measured.
5. The instrument for experimental measurement comprises a dh3816 static strain gauge, a displacement sensor and an MFF series multipoint thin film pressure testing system. In addition, the components for auxiliary test also comprise strain gauges, wires and the like.
In order to measure the stress of the concerned area, the test adopts a three-way strain gauge and a one-way strain gauge for measurement.
To measure the contact pressure on the deck surface, an MFF series multi-point film pressure test system was used, which had 8 channels each. The pressure sensor used in this system is a FlexiForceA201 type membrane pressure sensor from Tekscan, usa. The resistance changes when the surface is stressed, and the stress size is measured by using the resistance change. During use, the sensor is calibrated by the calibration platform, then the sensing area of the sensor is positioned on a measuring point, the sensor and the data acquisition unit are connected with the computer through a wire, and the measured pressure value is acquired and recorded by special software.
129 test stress measuring points are arranged in total, wherein 63 test points of the plate grid are arranged, and the strain gauge is positioned on the lower surface of the deck plate and is transversely symmetrical about the center of the plate grid. The beam measuring points are 3, and the strain gauges are positioned at the center of the joint of the beam web and the deck plate and the center of the beam panel. 63 longitudinal bone measuring points are arranged, and the strain gauge is positioned at the joint of the longitudinal bone web plate and the deck plate and on the longitudinal bone panel. All plate grid measuring points adopt three-way strain gauges, most of the cross beams and the longitudinal ribs adopt one-way strain gauges, and only special positions adopt the three-way strain gauges.
The test displacement measuring points are 12 in number and are mainly positioned in the center and one quarter of the deck plate, and the longitudinal bone panel spans the center of the cross beam panel.
The contact force testing points are 24-27 in number according to different working conditions, and based on the uniform distribution of the bottom range of the landing pad, when the diaphragm of the landing pad is not overlapped with the beam of the deck, three pressure testing points are added at the beam.
6. If directly place pressure sensor between landing pad and deck, the fine iron fillings on the deck cause the puncture to pressure sensor easily after the loading, lead to pressure sensor inefficacy, make the unable collection of test data. Therefore, a 1-2 mm rubber film is needed to be arranged between the deck and the landing pad, and the pressure sensor is adhered to the film. The test draws a pressure measurement point diagram corresponding to each working condition on the film in advance, before the test is carried out each time, the position of the landing pad is firstly positioned and the pressure sensors are arranged, and when the next working condition is carried out after the working condition is finished each time, the pressure sensors are required to be arranged again and are pressed in advance, so that the pressure sensors are ensured to work normally and the pressure acquisition system channel is smooth.
The distance between the center of the bottom of the landing pad and the cross beam is recorded as X (mm), the distance between the center of the bottom of the landing pad and the longitudinal bone is recorded as Y (mm), and different test working conditions are realized by adjusting the positions of the reaction frame and the oil cylinder front, back, left and right. In the test, firstly, the deck model and the landing pad model are moved to the positions required by the test working condition, the landing pad and the auxiliary loading device are connected with the oil cylinders, and the measuring ranges of the two oil cylinders are 40 tons. And after determining that each instrument works normally, performing formal loading tests, synchronously loading the two oil cylinders, uniformly loading the load at the speed of 10kN/min, loading the two oil cylinders to 10 tons at the same time, adjusting the load of the two oil cylinders to ensure that the displacement difference of pressure heads of the oil cylinders is basically consistent (less than 0.5 mm), so as to ensure that the top of the landing pad does not deflect longitudinally, ensure that the resultant force of the two oil cylinders is about 20 tons, respectively recording the loading size of the two oil cylinders, and acquiring data. Then slowly unloaded for subsequent testing.
7. The test data collected are contact pressure, deck stress and deck displacement. The data of the three-direction strain gage test point are strain values in three directions, the Hooke's law can be used for converting the data into corresponding stress in the material elasticity stage, and all the working conditions of the test are in the material elasticity range according to finite element pre-simulation. The test neglects the stress in the direction vertical to the plane (namely the thickness direction of the plate), adopts a three-dimensional strain gage to measure the two-dimensional strain, and then obtains the two-dimensional stress through the stress-strain relationship.
The formula for solving the main strain from the strains in three directions is as follows:
and obtaining a stress formula of the elastic stage by Hooke's law:
8. the results of the numerical simulation and the test results are compared and analyzed, the numerical model is corrected, and the deck plate stress and the longitudinal stress results are shown in the table 4, the sum of the deck plate Mises stress at the front end of the landing pad under each working condition is summarized in the table 5, and the maximum normal stress of the longitudinal panel under each working condition is summarized. The landing pad load distribution rule and the deck response rule can be found through test results.
TABLE 4
| Working conditions | Experimental value (MPa) | Finite element value (MPa) |
| X＝0mm，Y＝300mm | 134.19 | 139 |
| X＝200mm，Y＝300mm | 249.94 | 288 |
| X＝400mm，Y＝300mm | 146.84 | 196.6 |
| X＝600mm，Y＝300mm | 172.60 | 175.9 |
| X＝800mm，Y＝300mm | 154.91 | 137 |
| X＝1000mm，Y＝300mm | 101.58 | 124.9 |
| X＝1200mm，Y＝300mm | 81 | 93.84 |
TABLE 5
| Working conditions | Experimental value (MPa) | Finite element value (MPa) |
| X＝0mm，Y＝0mm | 38.36 | 49.93 |
| X＝200mm，Y＝0mm | 78.54 | 87.91 |
| X＝400mm，Y＝0mm | 126.9 | 132.5 |
| X＝600mm，Y＝0mm | 140.49 | 151.7 |
| X＝800mm，Y＝0mm | 128.91 | 140.9 |
| X＝1000mm，Y＝0mm | 111.09 | 124.6 |
| X＝1200mm，Y＝0mm | 118.45 | 117.4 |
The method can effectively realize the test of the nonlinear response of the deck under the loading action of the landing pad, and simultaneously, the feasibility and the practicability of the method are verified through experiments. The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, therefore, the present invention should be limited only by the appended claims.
The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (9)
1. A deck nonlinear response test testing method under the loading action of a landing pad is characterized by comprising the following steps:
s1: constructing a deck local finite element model;
s2: constructing a landing pad finite element model;
s3: performing nonlinear contact finite element analysis between the deck and the landing pad based on the deck local finite element model and the landing pad finite element model;
s4: constructing a test tool based on the result of the nonlinear contact finite element analysis;
s5: constructing a test system and arranging sensors based on the constructed test tool;
s6: selecting working conditions based on the constructed test system and the arranged sensors, and performing model test based on the selected working conditions;
s7: collecting and processing test data of the model test;
s8: and comparing the numerical simulation result obtained by the nonlinear contact finite element analysis with the processed test result, and correcting the numerical model.
2. The method for testing the deck nonlinear response test under the loading effect of the landing pad according to claim 1, wherein the method for constructing the deck local finite element model in S1 comprises the following steps: the finite element model of the deck is constructed by adopting quadrilateral plate units, wherein the finite element model of the deck consists of deck plates, cross beams and longitudinal bones.
3. The method for testing the deck nonlinear response under the loading effect of the landing pad of claim 1, wherein the method for constructing the finite element model of the landing pad in the step S2 comprises the following steps: the landing pad is constructed by combining quadrilateral and triangular plate units, wherein the landing pad finite element model is of a wedge-shaped structure and consists of a bottom plate, side plates, a top plate, longitudinal ribs and a cross beam.
4. The method for testing the nonlinear response test of the deck under the loading effect of the landing pad of claim 1, wherein the method for performing the nonlinear contact finite element analysis between the deck and the landing pad in the step S3 comprises the following steps: the deck plate is a contact main surface, the landing pad bottom plate is a contact slave surface, the normal contact property is hard contact, and the tangential contact property is a coulomb friction model.
5. The deck nonlinear response test method under the loading effect of the landing pad according to claim 1, wherein the method for constructing the test tool in the step S4 is as follows: the landing pad load is applied by adopting a hydraulic oil cylinder loading mode;
the specific process is as follows: an auxiliary loading component is arranged to be connected with the landing pad through a bolt, and the auxiliary loading component covers a top plate of the landing pad; the oil cylinder pressure head is connected with the auxiliary loading component by a flange; the whole test model is fixed on the reaction frame through the bottom pier.
6. The method for testing the deck nonlinear response under the loading effect of the landing pad according to claim 1, wherein the method for constructing the test system in the step S5 comprises the following steps: the input variable of the test system is an external load provided by the test tool, and the output variable of the test system is deck contact pressure, deck stress distribution and deck deformation;
the method for arranging the sensors in the S5 comprises the following steps: the pressure sensor is arranged between the deck and the landing pad, and the strain gauge and the displacement sensor are uniformly arranged on the lower surface of the deck plate and the longitudinal beam.
7. The method for testing the deck nonlinear response under the loading effect of the landing pad of claim 1, wherein the selection method of the working conditions in the S6 comprises the following steps: selecting research working conditions according to the relative positions of the center of the bottom of the landing pad, the deck beam and the deck longitudinal frame; the landing pad moves longitudinally relative to the deck at fixed intervals, and the most dangerous working condition is obtained through testing;
the method for carrying out model test based on the deck local finite element model and the landing pad finite element model in the S6 comprises the following steps: and loading the top of the landing pad by adopting double oil cylinders, wherein the positions of the double oil cylinders are symmetrical about the center of the bottom of the landing pad, acquiring the elongation of an oil cylinder pressure head by adopting a stay wire type displacement meter, finely adjusting the load of each oil cylinder to keep the elongation of each oil cylinder pressure head consistent, recording the load of each oil cylinder, and recording the sum of the loads of each oil cylinder as the load of the landing pad.
8. The method for testing the nonlinear response test of the deck under the loading effect of the landing pad according to claim 1, wherein the method for collecting and processing the test data of the model test in the step S7 comprises: and acquiring measurement data of the sensor through a data acquisition instrument, and acquiring deck pressure distribution and stress distribution based on the measurement data.
9. The method for testing the deck nonlinear response under the loading effect of the landing pad according to claim 1, characterized in that the test result in S8 is compared with a numerical simulation result, the numerical simulation result is corrected according to the test result, and a more effective numerical model is constructed to realize the exploration of the deck structure response under more complex working conditions.
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| CN106706239A (en) * | 2016-11-30 | 2017-05-24 | 山西省交通科学研究院 | Bridge fast load experimental test method |
| CN111931305A (en) * | 2020-07-30 | 2020-11-13 | 上海交通大学 | Binding system and container stacking nonlinear dynamic response test method |
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| CN106706239A (en) * | 2016-11-30 | 2017-05-24 | 山西省交通科学研究院 | Bridge fast load experimental test method |
| CN111931305A (en) * | 2020-07-30 | 2020-11-13 | 上海交通大学 | Binding system and container stacking nonlinear dynamic response test method |
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