CN114942188A - Orthotropic deck plate fatigue test device and fatigue performance evaluation method - Google Patents
Orthotropic deck plate fatigue test device and fatigue performance evaluation method Download PDFInfo
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- CN114942188A CN114942188A CN202210636370.9A CN202210636370A CN114942188A CN 114942188 A CN114942188 A CN 114942188A CN 202210636370 A CN202210636370 A CN 202210636370A CN 114942188 A CN114942188 A CN 114942188A
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- 238000009661 fatigue test Methods 0.000 title claims abstract description 98
- 238000011156 evaluation Methods 0.000 title claims abstract description 24
- 238000012360 testing method Methods 0.000 claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims description 56
- 239000010959 steel Substances 0.000 claims description 56
- 238000003466 welding Methods 0.000 claims description 32
- 238000006073 displacement reaction Methods 0.000 claims description 18
- 230000008859 change Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000000452 restraining effect Effects 0.000 claims description 2
- 241001016380 Reseda luteola Species 0.000 description 5
- 238000011160 research Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
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- 238000000429 assembly Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
Abstract
The invention discloses an orthotropic deck plate fatigue test device and a fatigue performance evaluation method, which are used for evaluating the fatigue performance of a test piece and comprise a loading device, a fatigue test piece boundary condition constraint component and a fatigue test piece supporting component; the test piece comprises a bridge deck top plate and U-shaped ribs; the loading device is connected with the top surface of the bridge deck top plate and is in threaded connection with the fatigue testing machine; the fatigue test piece boundary condition constraint component is arranged at the end part of the top plate of the bridge deck and is fixedly connected with the top plate of the bridge deck; two fatigue test piece boundary condition constraint components are fixedly mounted on the fatigue test piece supporting component. The invention solves the problems of poor applicability of the test piece size of the test device in the existing fatigue test, inconsistency of the constraint form with the actual bridge, stress concentration of a loading device, and non-uniform fracture failure length and stress level of the fatigue crack.
Description
Technical Field
The invention relates to the technical field of orthotropic bridge decks, in particular to a fatigue test device and a fatigue performance evaluation method for orthotropic bridge decks.
Background
In recent years, large-span steel bridges are rapidly developed at home and abroad, and steel box girders and orthotropic steel bridge decks are widely applied to the large-span steel bridges. The orthotropic bridge deck is formed by welding longitudinal and transverse stiffening rib plates, transverse partition plates and auxiliary components, has the advantages of light dead weight, high bearing capacity, attractive appearance, convenience and quickness in construction, short construction period and the like, and is widely applied.
However, the orthotropic bridge deck has the problems of complex stress state of the connecting positions of all components, large quantity of connecting welding lines, stress concentration and the like, fatigue cracks appear in the in-service orthotropic bridge deck structure, the fatigue cracks of the top plate and the U-shaped ribs account for 20% of the total number of the counted fatigue cracks, adverse effects are generated on a pavement layer structure, and the service cycle and the safety performance of the steel bridge deck are influenced. The traditional connecting form of the top plate and the U-shaped ribs of the orthotropic bridge deck plate structure is a single-face groove welding seam, the welding process is simple, the construction is convenient, and the fatigue cracks appear at the weld toe and the weld root positions of the orthotropic bridge deck plate in service due to the asymmetric connection of the U-shaped ribs and the deck plate.
The structural details of the orthotropic steel bridge deck slab have great influence on the fatigue performance of the orthotropic steel bridge, and domestic related scientific researchers develop fatigue performance test researches on the structural details of the orthotropic steel bridge deck slab. However, in experimental research, various fatigue test pieces with different sizes, test piece constraint forms with different forms and different loading modes appear, the constraint forms and the stress forms of the bridge deck in the real bridge are similar, the actuator of the fatigue testing machine in the loading mode directly acts on the surface of the top plate through the connecting steel plate, and the stress concentration phenomenon of the steel plate and the bridge deck top plate is serious.
In the existing research results of fatigue tests, no fatigue test research for investigating the fatigue performance of a double-side welding connection welding seam exists at present, and the existing fatigue test device is lack of a fatigue test device applicable to various specifications and sizes, different constraint forms and load models.
The traditional method for evaluating the fatigue performance of the orthotropic steel bridge deck slab is mostly used as an evaluating method for the fatigue fracture failure of the orthotropic bridge deck slab by measuring the strain of a structure, visually observing or measuring the length of a fatigue crack by an instrument and taking the length of the fatigue crack to reach a certain length value or the fatigue stress level to reach a certain level, but the specific values of the length of the crack and the stress level have difference, and the evaluating method for the fatigue performance lacks a unified evaluating standard.
Disclosure of Invention
The invention aims to provide an orthotropic bridge deck plate fatigue test device and a fatigue performance evaluation method, and aims to solve the problems that the test device in the existing fatigue test is poor in size applicability, the constraint form is not in accordance with the actual bridge, the stress of a loading device is concentrated, the fracture failure length of a fatigue crack is not uniform, and the stress level is not uniform.
In order to achieve the purpose, the invention provides the following scheme: the invention provides an orthotropic bridge deck fatigue test device, which is used for evaluating the fatigue performance of a test piece and is characterized by comprising the following components: the device comprises a loading device, a fatigue test piece boundary condition constraint component and a fatigue test piece supporting component; the test piece comprises a bridge deck top plate and U-shaped ribs; the loading device is connected with the top surface of the bridge deck top plate and is in threaded connection with the fatigue testing machine;
the fatigue test piece boundary condition constraint component is arranged at the end part of the bridge deck top plate and is fixedly connected with the bridge deck top plate; and two fatigue test piece boundary condition constraint assemblies are fixedly mounted on the fatigue test piece supporting assembly.
The loading device comprises connecting rubber, a connecting steel plate and a connecting piece; the connecting piece is in threaded connection with the fatigue testing machine; the connecting steel plate and the connecting piece are formed by fillet welding and seam welding; the connecting rubber is arranged between the bottom surface of the connecting steel plate and the top plate of the bridge deck.
The fatigue test piece supporting assembly comprises a base, a supporting vertical plate and a supporting top plate; the supporting vertical plates are respectively arranged on two sides of the top surface of the base; each supporting vertical plate is welded with one supporting top plate; the U-shaped rib is arranged in a space formed by the two supporting vertical plates and the base;
and the supporting top plate is provided with a bolt hole group for connecting the fatigue test piece boundary condition constraint assembly.
Each supporting top plate is connected with a fatigue test piece boundary condition constraint assembly which comprises round steel, a horizontal baffle, a bolt and angle steel; the round steel is welded on the bottom surface of the end part of the top plate of the bridge deck; horizontal baffles fixedly arranged on the top surface of the supporting top plate are arranged on two sides of the peripheral wall of the round steel; the round steel and the horizontal baffle are fixedly connected through the bolt; the two end faces of the round steel are respectively provided with the angle steel; the angle steel corresponds to the position of the bolt hole group and is connected with the supporting top plate through the bolt.
And the base is also fixedly provided with a laser displacement meter.
And the bridge deck top plate and the U-shaped ribs are connected and formed through connecting welding seams formed by single-side welding or double-side welding.
A fatigue performance evaluation method comprises an orthotropic bridge deck fatigue test device, and comprises the following steps:
prefabricating and processing each member of a loading device, a fatigue test piece boundary condition constraint component, a fatigue test piece support component and a test piece in the fatigue test device, and respectively assembling the loading device, the fatigue test piece boundary condition constraint component, the fatigue test piece support component and the test piece;
loading according to a loading mode of preloading-loading, and detecting the working state and the performance of the instrument and equipment during preloading; in the fatigue test process, a laser displacement meter on the upper surface of the base is used for monitoring the dynamic displacement delta below the connecting position of the bridge deck top plate and the U-shaped rib i ；
Analyzing fatigue test data, determining a method for calculating the dynamic rigidity of the structure under the fatigue fracture failure evaluation condition by using the fatigue test data, and determining the dynamic rigidity value K of the structure i And calculating a formula to obtain the dynamic rigidity of the structure, and determining fracture failure evaluation conditions.
The fatigue performance evaluation method further comprises the steps of arranging strain gauges, measuring dynamic strain and structural stress, and evaluating the fatigue life and the fatigue strength of the structure.
The evaluation test pieceThe stiffness and fatigue failure conditions being determined by the value of the change in external load F i Amplitude delta of structural displacement variation i Performing conversion to obtain a structure dynamic stiffness value K i ；
The structure dynamic stiffness value K i The calculation method comprises the following steps:
K i ＝ΔF i /Δδ i (1)
wherein, Δ F i Amplitude of change, Δ δ, for fatigue loading i The amplitude of the change in the displacement of the structure.
The invention discloses the following technical effects: (1) the test device is suitable for the fatigue performance test of the orthotropic bridge deck with various top plate thicknesses and widths, can be suitable for wider bridge decks by adjusting angle steel and control bolts, can increase the top plate thickness because the upper surface of the top plate is not constrained, and has wide application range.
(2) The boundary constraint conditions of the test piece are more scientific and reasonable, the constraint conditions are consistent with the constraint form of the actual bridge, and the fatigue test data can reflect the real stress state of the real bridge.
(3) The loading device is more reasonable, and the form of connecting rubber and fatigue test piece contact power transmission is adopted, so that stress concentration of the top plate caused by local area compression is avoided, and the loading device is closer to an actual stress form.
(4) The testing device can be used for inspecting the fatigue tests of the structural forms of single-side welding and double-side welding seams and comparing the fatigue performance of the fatigue welding seams on the inner side and the outer side.
(5) The structural dynamic stiffness in the process of the orthotropic deck plate fatigue test is used as a fatigue fracture failure evaluation condition, the problem that the fatigue crack length and the stress level are not uniform in the traditional evaluation method is solved, and the evaluation method is more scientific, simple and convenient.
(6) Based on the structural stress, by means of the orthotropic bridge deck fatigue test device, the evaluation of the fatigue strength and the fatigue life of the orthotropic bridge deck top plate and the U-shaped ribs can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a perspective view of an orthotropic deck plate fatigue test apparatus;
FIG. 2 is a front view of the orthotropic deck plate fatigue testing apparatus;
FIG. 3 is a left side view of the orthotropic deck plate fatigue testing apparatus;
FIG. 4 is a top view of the orthotropic deck plate fatigue testing apparatus;
FIG. 5 is a perspective view of the loading device;
FIG. 6 is a perspective view of a bridge deck top plate in partial configuration;
FIG. 7 is a front view of a deck roof;
FIG. 8 is a diagram of a boundary condition constraint component;
FIG. 9 is a schematic diagram of a boundary condition constraint component (without angle steel);
FIG. 10 is a schematic view of a support assembly;
FIG. 11 is a schematic view of a laser displacement meter;
wherein, 1: a loading device; 11: a connecting member; 12: connecting steel plates; 13: connecting rubber; 2: a test piece; 21: a bridge deck top plate; 22: a U-shaped rib; 23: connecting the welding seams; 3: a boundary condition constraint component; 31: round steel; 32: a horizontal baffle; 33: a bolt; 34: angle steel; 4: a support assembly; 41: supporting a top plate; 42: supporting the vertical plate; 43: a base; 5: a laser displacement meter.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
The invention provides an orthotropic deck plate fatigue test device, which is used for evaluating the fatigue performance of a test piece 2 and comprises the following components: the device comprises a loading device 1, a fatigue test piece boundary condition constraint component 3 and a fatigue test piece supporting component 4; the test piece 2 comprises a bridge deck top plate 21 and a U-shaped rib 22; the loading device 1 is connected with the top surface of the bridge deck top plate 21, and the loading device 1 is in threaded connection with the fatigue testing machine;
the fatigue test piece boundary condition constraint component 3 is arranged at the end part of the bridge deck top plate 21 and is fixedly connected with the bridge deck top plate 21; two fatigue test piece boundary condition constraint components 3 are fixedly arranged on the fatigue test piece supporting component 4.
The loading device 1 comprises a connecting rubber 13, a connecting steel plate 12 and a connecting piece 11; the connecting piece 11 is in threaded connection with the fatigue testing machine; the connecting steel plate 12 and the connecting piece 11 are formed by fillet welding and seam welding; and a connecting rubber 13 is arranged between the bottom surface of the connecting steel plate 12 and the bridge deck top plate 21.
The fatigue test piece supporting component 4 comprises a base 43, a supporting vertical plate 42 and a supporting top plate 41; the supporting vertical plates 42 are respectively arranged on two sides of the top surface of the base 43; a supporting top plate 41 is welded on each supporting vertical plate 42; the U-shaped rib 22 is arranged in a space formed by the two supporting vertical plates 42 and the base 43;
the supporting top plate 41 is provided with a bolt hole group for connecting the fatigue test piece boundary condition restraining component 3.
Each supporting top plate 41 is connected with a fatigue test piece boundary condition constraint component 3 which comprises round steel 31, a horizontal baffle 32, a bolt 33 and angle steel 34; the round steel 31 is welded on the bottom surface of the end part of the bridge deck top plate 21; horizontal baffles 32 fixedly arranged on the top surface of the supporting top plate 41 are arranged on two sides of the peripheral wall of the round steel 31; the round steel 31 and the horizontal baffle 32 are fixedly connected through a bolt 33; two end faces of the round steel 31 are respectively provided with an angle steel 34; the angle steel 34 corresponds to the position of the bolt hole group and is connected with the top support plate 41 through the bolt 33.
The base 43 is also fixedly provided with a laser displacement meter 5.
The bridge deck top plate 21 and the U-shaped rib 22 are connected and formed through a connecting welding seam 23 formed by single-side welding or double-side welding.
A fatigue performance evaluation method comprises an orthotropic bridge deck fatigue test device, and comprises the following steps:
prefabricating and processing each component of a loading device 1, a fatigue test piece boundary condition constraint component 3, a fatigue test piece support component 4 and a test piece 2 in the fatigue test device, and respectively assembling the loading device 1, the fatigue test piece boundary condition constraint component 3, the fatigue test piece support component 4 and the test piece 2;
loading according to a preloading-loading mode, and detecting the working state and the performance of the instrument and equipment during preloading; during the fatigue test, the dynamic displacement delta below the connecting position of the bridge deck top plate 21 and the U-shaped rib 22 is monitored by using the laser displacement meter 5 on the upper surface of the base 43 i ；
Analyzing fatigue test data, using the fatigue test data to define a calculation method of the dynamic rigidity of the structure under the fatigue fracture failure evaluation condition, and using the value K of the dynamic rigidity of the structure i And calculating a formula to obtain the dynamic rigidity of the structure, and determining fracture failure evaluation conditions.
The fatigue performance evaluation method further comprises the steps of arranging strain gauges, measuring dynamic strain and structural stress, and evaluating the fatigue life and the fatigue strength of the structure.
The rigidity and the fatigue failure condition of the test piece are evaluated through an external load change value F i Amplitude delta of structural displacement variation i Performing conversion to obtain a structure dynamic stiffness value K i ；
Dynamic stiffness value K of structure i The calculation method comprises the following steps:
K i ＝ΔF i /Δδ i
wherein, Δ F i Amplitude of change, Δ δ, for fatigue loading i The amplitude of the change in the displacement of the structure.
In one embodiment of the invention, the specific steps of assembling the loading device 1, the fatigue test piece boundary condition constraint component 3, the fatigue test piece support component 4 and the test piece 2 are as follows: determining the position of the center point of the base 43 according to the position of the fatigue testing machine; carrying out size positioning, member cleaning, welding connection and post-welding treatment on the base 43, the supporting vertical plate 42 and the supporting top plate 41; positioning and welding the horizontal baffle 32 and the supporting top plate 41 according to the assembly mode of each component of the boundary condition constraint assembly;
according to the connection mode of the fatigue test specimen, the bridge deck top plate 21 and the U-shaped rib 22 are welded and connected; determining the welding position of the round steel 31 according to the size constraint condition of the bridge deck top plate 21, and welding the round steel 31 with the bottom surface of the bridge deck top plate 21 by adopting an angle welding seam;
positioning and placing the test piece 2 on a supporting top plate 41, enabling the round steel 31 to be in contact with the upper surface of the supporting top plate 41, screwing the bolt of the horizontal baffle plate 32 at one end to fix the round steel 31, and connecting the angle steel 34 to the supporting top plate 41 through the bolt;
according to the loading position and the loading working condition, the connecting piece 11 is connected with the connecting steel plate 12 through an angle welding seam, the connecting steel plate 12 is placed on the connecting rubber 13, the size and the position deviation are controlled, and the connecting piece 11 is connected with the fatigue testing machine through a bolt; the laser displacement meter 5 is fixed on the corresponding position of the base 43 by a magnetic base.
In one embodiment of the present invention, the bridge deck top plate 21 and the U-shaped rib 22 are welded by a double-sided weld; then the inner weld is welded first and then the outer weld is welded.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (9)
1. An orthotropic deck plate fatigue test device for fatigue performance assessment of a test piece (2), characterized by comprising: the device comprises a loading device (1), a fatigue test piece boundary condition constraint component (3) and a fatigue test piece support component (4); the test piece (2) comprises a bridge deck top plate (21) and a U-shaped rib (22); the loading device (1) is connected with the top surface of the bridge deck top plate (21), and the loading device (1) is in threaded connection with a fatigue testing machine;
the fatigue test piece boundary condition constraint assembly (3) is arranged at the end part of the bridge deck top plate (21) and is fixedly connected with the bridge deck top plate (21); and the fatigue test piece supporting component (4) is fixedly provided with two fatigue test piece boundary condition restraining components (3).
2. The orthotropic decking fatigue testing apparatus of claim 1, wherein: the loading device (1) comprises a connecting rubber (13), a connecting steel plate (12) and a connecting piece (11); the connecting piece (11) is in threaded connection with the fatigue testing machine; the connecting steel plate (12) and the connecting piece (11) are formed by fillet welding and seam welding; the connecting rubber (13) is arranged between the bottom surface of the connecting steel plate (12) and the bridge deck top plate (21).
3. The orthotropic decking fatigue testing apparatus of claim 1, wherein: the fatigue test piece supporting assembly (4) comprises a base (43), a supporting vertical plate (42) and a supporting top plate (41); the supporting vertical plates (42) are respectively arranged on two sides of the top surface of the base (43); each supporting vertical plate (42) is welded with one supporting top plate (41); the U-shaped rib (22) is arranged in a space formed by the two supporting vertical plates (42) and the base (43);
and the supporting top plate (41) is provided with a bolt hole group for connecting the fatigue test piece boundary condition constraint assembly (3).
4. The orthotropic deck plate fatigue test device of claim 3, wherein: each supporting top plate (41) is connected with a fatigue test piece boundary condition constraint assembly (3) which comprises round steel (31), a horizontal baffle (32), a bolt (33) and angle steel (34); the round steel (31) is welded on the bottom surface of the end part of the bridge deck top plate (21); horizontal baffles (32) fixedly arranged on the top surface of the supporting top plate (41) are arranged on two sides of the peripheral wall of the round steel (31); the round steel (31) and the horizontal baffle (32) are fixedly connected through the bolt (33); the two end faces of the round steel (31) are respectively provided with the angle steel (34); the angle steel (34) corresponds to the position of the bolt hole group and is connected with the supporting top plate (41) through the bolt (33).
5. The orthotropic decking fatigue testing apparatus of claim 4, wherein: and the base (43) is also fixedly provided with a laser displacement meter (5).
6. The orthotropic decking fatigue testing apparatus of claim 1, wherein: the bridge deck top plate (21) and the U-shaped ribs (22) are connected and formed through connecting welding seams (23) formed by single-side welding or double-side welding.
7. A fatigue performance evaluation method comprising the orthotropic deck plate fatigue test apparatus of any one of claims 1 to 6, comprising the steps of:
prefabricating each component of a loading device (1), a fatigue test piece boundary condition constraint component (3), a fatigue test piece support component (4) and a test piece (2) in the fatigue test device, and respectively assembling the loading device (1), the fatigue test piece boundary condition constraint component (3), the fatigue test piece support component (4) and the test piece (2);
loading according to a loading mode of preloading-loading, and detecting the working state and the performance of the instrument and equipment during preloading; in the fatigue test process, a laser displacement meter (5) on the upper surface of a base (43) is used for monitoring the dynamic displacement delta below the connecting position of the bridge deck top plate (21) and the U-shaped rib (22) i ；
Analyzing fatigue test data, and determining fatigue by using the fatigue test dataA method for calculating the dynamic rigidity of a structure under the fatigue fracture failure evaluation condition utilizes the value K of the dynamic rigidity of the structure i And calculating a formula to obtain the dynamic rigidity of the structure, and determining fracture failure evaluation conditions.
8. A fatigue performance evaluation method according to claim 7, wherein: the fatigue performance evaluation method further comprises the steps of arranging strain gauges, measuring dynamic strain and structural stress, and evaluating the fatigue life and the fatigue strength of the structure.
9. The fatigue performance evaluation method according to claim 7, wherein: the rigidity and fatigue failure conditions of the test piece are evaluated through an external load change value F i Amplitude delta of structural displacement variation i Performing conversion to obtain a structure dynamic stiffness value K i ；
The structure dynamic stiffness value K i The calculation method comprises the following steps:
K i ＝ΔF i /Δδ i (1)
wherein, Δ F i Amplitude of change, Δ δ, for fatigue loading i The amplitude of the change in the displacement of the structure.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117554169A (en) * | 2023-11-17 | 2024-02-13 | 哈尔滨工业大学 | Fixed end restraint device for plate-shaped member surface external loading test and dismounting method thereof |
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