CN109696366A - Simulate the secondary load device and application method of the effect of pave-load layer stress spread - Google Patents
Simulate the secondary load device and application method of the effect of pave-load layer stress spread Download PDFInfo
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- CN109696366A CN109696366A CN201811590503.3A CN201811590503A CN109696366A CN 109696366 A CN109696366 A CN 109696366A CN 201811590503 A CN201811590503 A CN 201811590503A CN 109696366 A CN109696366 A CN 109696366A
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- 230000000694 effects Effects 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims abstract description 58
- 238000004088 simulation Methods 0.000 claims abstract description 29
- 238000012360 testing method Methods 0.000 claims abstract description 22
- 238000011068 loading method Methods 0.000 claims abstract description 11
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 36
- 229910000831 Steel Inorganic materials 0.000 claims description 23
- 239000010959 steel Substances 0.000 claims description 23
- 230000000712 assembly Effects 0.000 claims description 5
- 238000000429 assembly Methods 0.000 claims description 5
- 239000000284 extract Substances 0.000 claims description 4
- 230000002349 favourable effect Effects 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- 239000003351 stiffener Substances 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 2
- 229910052742 iron Inorganic materials 0.000 claims 1
- 239000007787 solid Substances 0.000 claims 1
- 238000009661 fatigue test Methods 0.000 abstract description 7
- 238000009792 diffusion process Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 10
- 238000003466 welding Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 239000011384 asphalt concrete Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000002689 soil Substances 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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating 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
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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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
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses the secondary load devices and application method of a kind of simulation pave-load layer stress spread effect, including load distribution system, load transmission system and viscoelastic contact simulation system.The load transmission system includes several load transfer devices, and the load transfer device includes connecting top plate, the power transmission spring of different stiffness factors, hinged bottom plate, connection sliding slot and connection slide bar.Based on the application method of above-mentioned auxiliary device, comprising steps of (1) determines the stiffness factor of each power transmission spring；(2) assembling of auxiliary device；(3) fatigue loading.The secondary load device and method of simulation pave-load layer stress spread effect of the invention can preferable diffusion of the simulation pave-load layer to fatigue load, short form test condition.The fatigue test results obtained based on secondary load device of the invention can be preferable considerations mat formation influence of the stress spread effect to test result, make obtained experimental result closer to actual operation situation.
Description
Technical field
The present invention relates to a kind of steel bridge construction fatigue test instruments, and in particular to a kind of simulation pave-load layer stress spread effect
Secondary load device and application method.
Background technique
Orthotropic Steel Bridge Deck is because having many advantages, such as that light-weight, intensity is high, bending resistance torsional rigidity is big, in Long span cable
It is widely used in system bridge.But since its construction is complicated, in wheel load, welding residual stress, welding defect
Etc. under the influence of factors, weld seam position easily fatigue cracking.Fatigue crack be the main bugbear that faces of current science of bridge building interface it
One, it is difficult to avoid that and early stage is difficult to find, bridge collapse accident is resulted even in when serious.Domestic and foreign scholars are directed to Steel Bridge Deck
The fatigue behaviour of plate welding seams has carried out a large amount of experimental study, but test specimen used is clean steel test specimen, but non-reasonable consideration paving
Fill the effect of layer.
Influence major embodiment of the pave-load layer to steel bridge deck fatigue behaviour be both ways: (1) since pave-load layer itself has
Certain rigidity, composed pave-load layer-steel bridge deck system have biggish composite rigidity, advantageously reduce steel bridge deck weldering
Stitch stress；(2) the stress spread effect of pave-load layer can make wheel load dispersion be transferred to steel bridge deck surface, reduce load collection
Degree.When fatigue test, on the basis of the fatigue stress measured, stress value is modified according to rigidity principle of stacking, finally
As a result can reasonable consideration mat formation the influence of stiffness layer.But due to the orthotropic of steel bridge deck itself, load simultaneously anisotropically expands
It is dissipated to steel bridge deck surface, but is focused more on right above top plate and U rib weld seam.Although pave-load layer is arranged in surface of test piece
Can preferably consider the influence of stress spread, but there are following two points deficiencies: (1) pave-load layer laying needs heated asphalt coagulation
Soil rolls repeatedly, is difficult to reach such requirement in laboratory；(2) since pave-load layer-steel bridge deck system has biggish group
Rigidity is closed, the loading equipemtns such as MTS need bigger operating power at this time, uneconomical.
As it can be seen that how in the fatigue test of steel bridge deck test specimen reasonable consideration pave-load layer stress spread influence, have become
For current technical problem urgently to be resolved.
Summary of the invention
Goal of the invention: the present invention provides a kind of secondary load device of simulation pave-load layer stress spread effect, the devices
Solve the problems, such as that laboratory is difficult to reach asphalt concrete, roll repeatedly；Solving existing systems equipment simultaneously needs
Power that will be bigger, uneconomic problem.
Technical solution: the secondary load device of simulation pave-load layer stress spread effect of the invention, including it is sequentially connected
Load distribution system, load transmission system and viscoelastic contact simulation system.
The load distribution system includes horizontal load distribution beam, and load can be distributed to lotus by the load distribution beam
It carries in transmission system.
The load transmission system includes the sequentially connected load transfer device of several transverse directions, each load transfer device
Including the connection top plate being connect with the load distribution beam, the hinged bottom plate being connect with the viscoelastic contact simulation system, with
And the power transmission elastic component between the connection top plate and hinged bottom plate.
The viscoelastic contact simulation system includes that can simulate wheel and steel bridge deck system viscoplasticity in realistic situation
The backing plate of touching act.
Based on above-mentioned apparatus, load distribution system evenly spreads to the load that system applies in load transmission system, and
According to the performance parameter of each system, obtain closer to the experimental condition closer to real bridge traffic-operating period.
In order to realize support and connect connection top plate, power transmission elastic component and hinged bottom plate, the connection top plate and hinged bottom
Be additionally provided between plate can support both of them and with power transmission elastic component is flexible and several slide assemblies of sliding extension, the sliding
Component includes that can slide set on the connection sliding slot connected between top plate and hinged bottom plate and in the connection sliding slot
Connection slide bar, the connection sliding slot and connect slide bar can with power transmission elastic component flexible sliding extension；Connect sliding slot and
Connection slide bar connects into an entirety for top plate, power transmission elastic component, hinged bottom plate is connected.
The load transfer device is equipped with odd number, and quantity can rationally be assembled according to the size of pre-add section.
The stiffness factor of power transmission elastic component is not exactly the same, and the stiffness factors of several power transmission elastic components is from centre to two
Side is gradually reduced.The preferred power transmission spring of power transmission elastic component, wherein the stiffness factor of middle springs is maximum, gradually to two sides
Reduce, makes the power for being transmitted to surface of steel plate substantially at normal distribution.
For each load transfer device clamping of realization, it is more convenient for increasing and decreasing load transfer device number according to actual needs,
Each connection top plate, hinged bottom plate two sides be respectively arranged with two adjacent connection top plates, hinged bottom plate can be made mutually to nibble
The groove and protrusion of conjunction；And the groove and raised central portion of the connection top plate are provided with bolt hole, in order to be connected with, and
It is equipped with magnet at the top of the nuts of bolt, further fixes clamping, magnet can prevent bolt from sinking.
In order to realize that load distribution system is connect with load transmission system, load distribution beam bottom is equipped with several cunnings
Block, the connection top plate is equipped with several sliding slots being used cooperatively with the sliding block, so that load distribution system and load be transmitted
System is detachably connected.
In order to make load distribution beam have great bending stiffness, the load distribution beam is vertically and horizontally put more energy into equipped with several
Rib.
Backing plate is connect with hinged bottom plate to realize, the hinged bottom plate offers several holes, and in each described hole
Equipped with the magnet that can adsorb the backing plate.
In order to make test more be bonded realistic situation, the backing plate from top to bottom successively include rubber surface layer, steel plate sandwich layer and
Rubber substrate.
Use the loading method of above-mentioned apparatus, comprising the following steps:
(1) determination of power transmission elastic component stiffness factor
According to the basic parameter of test specimen, the finite element model for having pave-load layer is established, area load is applied to pave-load layer table
The most unfavorable combination in face extracts the vertical stress calculated result of surface of test piece and is fitted with functions such as Gauss equations, draws
Matched curve is equivalent to curve according to slices method, and is calculated as follows to obtain the stiffness factor of each power transmission spring by matched curve:
k1=F1/x
Wherein, k1For the stiffness factor of middle spring part；F1For pressure value corresponding to the maximum rectangle of area；X is actuation
Scheduled load deflection；h1For the height of the corresponding rectangle of power transmission elastic component；kiFor the stiffness factor of power transmission elastic component；hiFor
Power transmission elastic component corresponds to the height of rectangle in curve, according to the elastic component stiffness factor determined, contacts producer and is customized.
(2) assembling of device
Each load transfer device is connected, and is fixed with screw rod；Backing plate is fixed on load transmission system bottom, by load
Distribution beam is fixed on connection top plate top.
(3) test load
Assembled secondary load device is placed in the least favorable loading position of test specimen, action head is pressed in load point
Surface with beam sets estimated actuation head load deflection x, can start fatigue loading.
Wherein, in step (1):
The material of paving course parameter of (1-1) according to the bridge analyzed, establishes the section of steel bridge deck with combined system of mating formation
Section finite element model.According to the least favorable loading position that will be used in test, load is applied to finite element model pave-load layer
Surface carries out Static Calculation and extracts the vertical stress of steel bridge deck surface direction across bridge.
(1-2) draws direction across bridge vertical stress distribution curve, is fitted using functions such as Gauss equations to it, and use
Slices method is equivalent at several rectangles by matched curve.The number of the rectangle precision required according to test determines, is also equal to
The number of required load transfer device.
(1-3) determines intermediate power transmission spring according to the estimated load deflection of maxium load value needed for testing, load actuation head
Stiffness factor.
The height for each rectangle that (1-4) is obtained according to slices method, determines the stiffness factor of remaining power transmission spring.In for example,
Between the stiffness factor of power transmission spring be k1, the height of corresponding rectangle is h1, then the essence of power transmission spring corresponding to rectangular elevation h2
Degree coefficient is k2:
In step (2), magnet is placed in the aperture of hinged bottom base plate, and backing plate is adsorbed in hinged bottom plate, completed
The fixation of backing plate；The sliding block of load distribution beam bottom is connected with the sliding slot connecting at the top of top plate, completes consolidating for load distribution beam
It is fixed.
The utility model has the advantages that the secondary load device and method of 1, simulation pave-load layer stress spread effect of the invention can be preferable
Diffusion of the simulation pave-load layer to fatigue load, short form test condition；2, it is obtained based on secondary load device of the invention
Fatigue test results can effectively consider that pave-load layer stress spread acts on influence to steel bridge deck fatigue behaviour, make fatigue test
Condition can be closer to real bridge traffic-operating period；3, technical support is provided to improve the precision of fatigue test results.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is the structural schematic diagram of load transfer device in the present invention；
Fig. 3 is that load transfer device connects top board structure schematic diagram in the present invention；
Fig. 4 is the hinged structural diagram of base plate of load transfer device in the present invention；
Fig. 5 is the magnet schematic diagram being placed in hinged bottom base plate hole in the present invention；
Fig. 6 is in the present invention for being fixedly connected with the nut structure schematic diagram of top plate；
Fig. 7 is load distribution beam structural schematic diagram in the present invention；
Fig. 8 is backing structure schematic diagram in the present invention；
Fig. 9 is the schematic diagram that the slices method of each device of spring stiffness coefficient is determined in the present invention；
Figure 10 is operation schematic diagram of the invention.
Specific embodiment
Referring to Fig. 1 to Figure 10, the secondary load of simulation pave-load layer stress spread effect described in one embodiment of the invention is filled
It sets, including sequentially connected load distribution system, load transmission system and viscoelastic contact simulation system.
Load distribution system includes load distribution beam 1 that is horizontal, being distributed to load in load transmission system, and
Equipped with several vertically and horizontally ribbed stiffeners.
Load transmission system includes odd number laterally sequentially connected load transfer device 2, and each load transfer device 2 includes
The connection top plate 21 that is connect with load distribution beam, the hinged bottom plate 22 being connect with viscoelastic contact simulation system and the company of being set to
The power transmission elastic component 23 between top plate 21 and hinged bottom plate 22, preferably power transmission spring are connect, the stiffness factor of middle springs is maximum, to
Two sides are gradually reduced, and make the power for being transmitted to surface of steel plate substantially at normal distribution.
Being additionally provided between connection top plate 21 and hinged bottom plate 22 both can support and connect and can be with power transmission elasticity
Part 23 is flexible and several slide assemblies of sliding extension, slide assemblies include being set between connection top plate 21 and hinged bottom plate 22
Connection sliding slot 24 and can the connection slide bar 25 that slide, connection sliding slot 24 and connection slide bar 25 can be in connection sliding slot 24
Power transmission elastic component 23 flexible and sliding extension.
Connection top plate 21, hinged bottom plate 22 two sides be respectively arranged with and can make two adjacent connection top plates 21, hinged bottom
The intermeshing groove of plate 22 and protrusion；And the groove and raised central portion of connection top plate 22 are provided with bolt hole 221, while the bottom of at
Portion is provided with screw cap hole 225, in order to be connected with bolt 222, and anti-settling magnet is equipped at the top of the nuts 223 of bolt 222
224, clamping is further fixed, anti-settling magnet 224 can prevent bolt from sinking.
Viscoelastic contact simulation system includes that can simulate wheel and steel bridge deck system viscoelastic contact in realistic situation
The backing plate 3 of behavior, backing plate 3 successively include rubber surface layer 31, steel plate sandwich layer 32 and rubber substrate 33 from top to bottom.
1 bottom of load distribution beam is equipped with several sliding blocks 11, and connection top plate 21 is equipped with several cunnings being used cooperatively with sliding block 11
Slot 26, so that load distribution system and load transmission system are detachably connected.
Hinged bottom plate 22 offers several holes 27, and the magnet 28 that can adsorb backing plate 3 is equipped in each hole 27.
The operation principle of the present invention is that:
For used steel bridge deck test specimen 4, the basic principle determination according to Stress influence line will be used least
Sharp loading position.With test specimen 4 having a size of basic parameter, the finite element model for having pave-load layer 5 is established, by simulating wheel effect
Area load 6 is applied at most unfavorable combination and static(al) solves.According to area load numerical curve 10 and extract steel bridge deck surface
Vertical stress simultaneously draws song 7, is fitted to obtain matched curve 7 using equations such as Gaussian functions.It is bent to fitting using slices method
Line 7 is simplified, obtain include several rectangles curve 9.
The stiffness factor of each power transmission spring is determined according to curve 9.Assuming that pressure value corresponding to the maximum rectangle of area is
F1, the scheduled load deflection of actuation is x, then is located in the middle the stiffness factor k of power transmission spring1For F1/ x, power transmission spring sum
Stiffness factor is then calculated as follows to obtain:
Wherein h1For the height of the corresponding rectangle of power transmission spring；kiFor the stiffness factor of power transmission spring sum；hiFor power transmission spring
With the height of corresponding rectangle.According to the stiffness factor for each spring being calculated, contacts factory and made.
Load distribution beam 1, load transmission system and backing plate 3 are assembled by the form of attached drawing 1, and are placed in test specimen most
Unfavorable loading position, as shown in Figure 10.After action head 8 compresses load distribution beam 1, scheduled actuation head load position is set
It moves, fatigue loading can be started.In the data such as measured weld fatigue stress, fatigue life, then considers pave-load layer and answer
The influence of power diffusion.
Claims (10)
1. a kind of secondary load device of simulation pave-load layer stress spread effect, it is characterised in that: including sequentially connected load
Distribution system, load transmission system and viscoelastic contact simulation system,
The load distribution system includes horizontal load distribution beam (1), and the load distribution beam (1) can be uniform by load
It is distributed in load transmission system；
The load transmission system includes the sequentially connected load transfer device of several transverse directions (2), each load transfer device
(2) include the connection top plate (21) being connect with the load distribution beam, connect with the viscoelastic contact simulation system it is hinged
Bottom plate (22) and the power transmission elastic component (23) being set between connection top plate (21) and hinged bottom plate (22)；
The viscoelastic contact simulation system includes that can simulate wheel and steel bridge deck system viscoelastic contact in realistic situation
The backing plate (3) of behavior.
2. the secondary load device of simulation pave-load layer stress spread effect according to claim 1, it is characterised in that: described
Connection top plate (21) and hinged bottom plate (22) between be additionally provided with can support both of them and with power transmission elastic component (23) stretch and slide
Flexible several slide assemblies are moved, the slide assemblies include being set between the connection top plate (21) and hinged bottom plate (22)
The connection slide bar (25) that connects sliding slot (24) and can be slided in connection sliding slot (24), and the connection sliding slot (24)
With connection slide bar (25) can with power transmission elastic component (23) flexible sliding extension.
3. the secondary load device of simulation pave-load layer stress spread effect according to claim 1 or 2, it is characterised in that:
The load transfer device (2) is equipped with odd number.
4. the secondary load device of simulation pave-load layer stress spread effect according to claim 1, it is characterised in that: several
The stiffness factor of the power transmission elastic component (23) is gradually reduced from centre to two sides.
5. the secondary load device of simulation pave-load layer stress spread effect according to claim 1, it is characterised in that: each institute
State connection top plate (22), the two sides of hinged bottom plate (23) are respectively arranged with and can make two adjacent connection top plates (22), hinged bottom
Plate (23) intermeshing groove and protrusion.
6. the secondary load device of simulation pave-load layer stress spread effect according to claim 1, it is characterised in that: described
Load distribution beam (1) bottom is equipped with several sliding blocks (11), and the connection top plate (22) is equipped with and is used cooperatively with the sliding block (11)
Several sliding slots (26), and load distribution system can be connect with load transmission system.
7. the secondary load device of simulation pave-load layer stress spread effect according to claim 1, it is characterised in that: described
Load distribution beam (1) is equipped with several vertically and horizontally ribbed stiffeners (12).
8. the secondary load device of simulation pave-load layer stress spread effect according to claim 1, it is characterised in that: described
Hinged bottom plate (23) offers several holes (27), and the magnetic that can adsorb the backing plate (3) is equipped in each described hole (27)
Iron (28).
9. the secondary load device of simulation pave-load layer stress spread effect according to claim 1, it is characterised in that: described
Backing plate (3) successively includes rubber surface layer (31), steel plate sandwich layer (32) and rubber substrate (33) from top to bottom.
10. the load side of the secondary load device of simulation pave-load layer stress spread effect according to 1-9 any claim
Method, which comprises the following steps:
(1) determination of power transmission elastic component (23) stiffness factor
According to the basic parameter of test specimen (4), the finite element model for having pave-load layer (5) is established, area load (6) is applied to and is mated formation
The most unfavorable combination on layer (5) surface extracts the vertical stress calculated result on test specimen (4) surface and is carried out with functions such as Gauss equations
Fitting is drawn matched curve (7), matched curve (7) is equivalent to curve according to slices method, and be calculated as follows to obtain each power transmission
The stiffness factor of elastic component (23):
k1=F1/x
Wherein, k1For the stiffness factor of intermediate power transmission elastic component (23)；F1For pressure value corresponding to the maximum rectangle of area；X is
The scheduled load deflection of actuation；h1For the height of the corresponding rectangle of power transmission elastic component；kiFor the stiffness factor of power transmission elastic component；
hiCorrespond to the height of rectangle in curve for power transmission elastic component；
(2) assembling of device
Each load transfer device (2) are connected, backing plate (3) is fixed on load transmission system bottom, load distribution beam (1) is solid
Due to connection top plate (22) top；
(3) test load
Assembled secondary load device is placed in the least favorable loading position of test specimen (4), action head (8) is pressed in load
The surface of distribution beam (1) sets estimated actuation head load deflection x, can start fatigue loading.
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|---|---|---|---|
| CN201811590503.3A CN109696366B (en) | 2018-12-25 | 2018-12-25 | Auxiliary loading device for simulating stress diffusion effect of pavement layer and application method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811590503.3A CN109696366B (en) | 2018-12-25 | 2018-12-25 | Auxiliary loading device for simulating stress diffusion effect of pavement layer and application method |
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| CN109696366B CN109696366B (en) | 2022-02-11 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112903445A (en) * | 2021-01-29 | 2021-06-04 | 北京工业大学 | Auxiliary test device applying non-Newtonian fluid |
| CN113392448A (en) * | 2021-05-31 | 2021-09-14 | 中铁二院工程集团有限责任公司 | Method and device for calculating combined stiffness under iron base plate and readable storage medium |
| CN114720276A (en) * | 2022-03-28 | 2022-07-08 | 河南交院工程技术集团有限公司 | A method for determining the tensile strength of fibers mixed in concrete |
| CN115901138A (en) * | 2022-12-03 | 2023-04-04 | 苏州科技大学 | Common loading simulation method and device for uniformly distributed load and concentrated load of simply supported beam |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112903445A (en) * | 2021-01-29 | 2021-06-04 | 北京工业大学 | Auxiliary test device applying non-Newtonian fluid |
| CN113392448A (en) * | 2021-05-31 | 2021-09-14 | 中铁二院工程集团有限责任公司 | Method and device for calculating combined stiffness under iron base plate and readable storage medium |
| CN113392448B (en) * | 2021-05-31 | 2022-08-05 | 中铁二院工程集团有限责任公司 | Method and device for calculating combined stiffness under iron base plate and readable storage medium |
| CN114720276A (en) * | 2022-03-28 | 2022-07-08 | 河南交院工程技术集团有限公司 | A method for determining the tensile strength of fibers mixed in concrete |
| CN114720276B (en) * | 2022-03-28 | 2024-11-26 | 河南交院工程技术集团有限公司 | A method for determining the tensile strength of mixed fibers in concrete |
| CN115901138A (en) * | 2022-12-03 | 2023-04-04 | 苏州科技大学 | Common loading simulation method and device for uniformly distributed load and concentrated load of simply supported beam |
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