CN107885938A - A kind of concrete meso-mechanical model analysis method based on APDL language developments - Google Patents
A kind of concrete meso-mechanical model analysis method based on APDL language developments Download PDFInfo
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- CN107885938A CN107885938A CN201711098345.5A CN201711098345A CN107885938A CN 107885938 A CN107885938 A CN 107885938A CN 201711098345 A CN201711098345 A CN 201711098345A CN 107885938 A CN107885938 A CN 107885938A
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Abstract
A kind of concrete meso-mechanical model analysis method based on APDL language developments, belongs to concrete mechanicses analysis field, and in particular to a kind of concrete meso-mechanical model analysis method.The present invention is using APDL Parametric Design Languages as platform, by inputting the material properties of concrete each component and the load mode of test specimen, it is modeled and smart grid divides, then solving model, judge the unit information read after loading, if meeting the condition that unit destroys, kill the unit, finally obtain output result, including the data of concrete macro-indicators and the mechanical behavior of concrete and destructive process.The present invention, which solves concrete meso-mechanical model and carries out sunykatuib analysis luck, is counted as that power is low, operation time is longer or the unhandy problem of user.The present invention can operate with concrete mechanicses analysis.
Description
Technical field
The invention belongs to concrete mechanicses analysis field, and in particular to a kind of concrete meso-mechanical model analysis method.
Background technology
As concrete material during people live, in engineering field application becomes increasingly popular and goed deep into, people produce to it,
The required precision of design also more and more higher.Then just need producers, designer and researcher can be deeper into ground
Understand response pattern and its essence of the concrete material under certain operating mode.And main Research scale arrives millimeter magnitude at 10 nanometers
In the range of mesomechanics, because it rationally, comprehensively can be explained more than millimeter magnitude, i.e., the mechanics of concrete in macro-scale
Behavior, and paid attention to by multi-party researcher, specifically, the research meanses on meso-scale can reach following purpose：
First, the respective internal and phase of material (i.e. interface between aggregate, cement mortar and aggregate and cement mortar) of each component is passed through
The origin cause of formation of concrete phenomenon on a macroscopic scale is explained in effect between mutually；In the performance of principal component and the condition of proportion of composing
Under, predict the performance indications in concrete macro-scale or behavior, such as intensity, rigidity, cracking trend.One of them is very heavy
The mesomechanics research meanses wanted, concrete is exactly considered as aggregate, cement mortar and interface combinations form between the two
Three-phase mixture, rational analysis model is constructed on a computer platform, analyzed using finite element method and to it, with side
Just researcher obtains related data result.
Because the geometric properties of concrete meso-mechanical model has certain complexity, and the material properties tool of constituent
There are sizable randomness, discreteness, cause the difficulty simulated to concrete meso-mechanical model higher.Therefore, researcher
A variety of methods that sunykatuib analysis is carried out to concrete meso-mechanical model are constructed, also include the common coagulation based on various analysis softwares
Native meso-mechanical model analysis method.But these conventional methods or be not easy to restrain, cause computing success rate low；Or calculate effect
Rate is not high；Or need the parameter inputted and the parameter that is manually set excessive, cause application effect is bad, user's operation not
Just.
The relevant field of concrete material to establish a suitable, efficient concrete carefully see that analysis method has very much must
Will, it is therefore proposed that a kind of computing success rate is high, arithmetic speed is easy to the concrete meso-mechanical model analysis that user understands soon simultaneously
Method becomes the problem of in the urgent need to address.
The content of the invention
When the present invention is in order to solve to carry out sunykatuib analysis to concrete meso-mechanical model, operation efficiency is low, operation time is longer
Or analytical effect it is bad the problem of, there is provided a kind of concrete meso-mechanical model analysis method based on APDL language developments.
A kind of concrete meso-mechanical model analysis method based on APDL language developments of the present invention, passes through following technical side
Case is realized：
Step 1: parameter inputs：The parameter for needing to input includes the loading of the material properties and test specimen of concrete each component
Mode；The material of each component includes：Interface between aggregate, cement mortar and aggregate and cement mortar；The material category of each component
Property includes：The modulus of elasticity of aggregate, the modulus of elasticity of cement mortar, the tensile strength of cement mortar, the pressure resistance of cement mortar
Degree, the modulus of elasticity at interface, cohesive force, angle of friction, tensile strength and shearing strength between aggregate and cement mortar；
Step 2: modeling and mesh generation：
Mesh generation is divided using the smart grid in APDL system frameworks, by smart grid division operation, is handled
The FEM model of object, i.e., it is the limited unit of different materials attribute that is connected by node and had been assigned by model partition
The model formed, the unit after dividing are linear elasticity unit and are respectively provided with the function of element death and birth；
Step 3: solving model：First according to the load mode inputted in step 1, load is divided into some loads and walked, then
Sequentially load；The equal information of reading unit after the completion of loading every time, the information of the unit are included inside unit respectively to cutting
Stress, first principal stress and third principal stress, analysis judgement is then carried out to unit according to the information of acquisition, if unit meets
The condition of destruction, then the unit is killed, enter back into next load step and subsequently solved, until loading is completed；
Step 4: result exports：
User can voluntarily select the mode of output result according to demand in APDL frameworks, and obtaining result includes two classes：
One kind is the data result of concrete macro-indicators, including the intensity of concrete, modulus of elasticity, load-displacement curve；It is another kind of
It is the mechanical behavior and destructive process of concrete.
The present invention compared with prior art, it is the most prominent the characteristics of and significant beneficial effect be：
Because all components are set as linearly in model of the present invention, so carrying out having such as during finite element analysis to model
Lower advantage：
Model unit is linear elasticity unit and is respectively provided with the function of element death and birth, and the essence for killing unit is to unit
The material properties of itself are multiplied by a minimum number, such as 1.0*10-14, while unit still may proceed to participate in calculating, so as to
The phenomenon of the geometrical non-linearity caused by unit lacks is avoided the occurrence of, its calculation is still in the range of linear solution, no
Need successive ignition；The phenomenon that numerical value is mutated in solution procedure is also avoided that simultaneously, ensures to solve good in convergence effect, speed is fast.
In addition, linear solution is substantially individual layer circulation, non-linear solution is substantially multilayer circulation, linear solution
Speed is far above non-linear solution.
In summary, the present invention has good in convergence effect, fast convergence rate so that operation efficiency is high, arithmetic speed is fast
A little.
Brief description of the drawings
Fig. 1 is the flow chart of the inventive method；
Fig. 2 is the operation interface of GUI modes input parameter of the present invention；
Fig. 3 is the operation interface of parametric program language in-put parameter of the present invention；
Fig. 4 is geometrical model appearance after the intelligent grid division of the present invention；
Fig. 5 is aggregate model appearance of the present invention；
Fig. 6 is the FEM model outward appearance of the invention concealed after Partial Mesh；
Fig. 7 is the Z-direction strain cloud atlas exported using the present invention；
Fig. 8 is the damage -form figure exported using the present invention；
Fig. 9 is the damage -form figure of the other direction view exported using the present invention；
Figure 10 is the load-displacement curve figure exported using the present invention.
1. cement mortar unit, boundary element between 2. aggregates and cement mortar, 3. aggregate units.
Embodiment
Embodiment one：A kind of as shown in figure 1, concrete based on APDL language developments that present embodiment provides
Meso-mechanical model analysis method, is specifically followed the steps below：
Step 1: parameter inputs：The parameter for needing to input includes the loading of the material properties and test specimen of concrete each component
Mode；The material of each component includes：Interface between aggregate, cement mortar and aggregate and cement mortar；The material category of each component
Property includes：The modulus of elasticity of aggregate, the modulus of elasticity of cement mortar, the tensile strength of cement mortar, the pressure resistance of cement mortar
Degree, the modulus of elasticity at interface, cohesive force, angle of friction, tensile strength and shearing strength between aggregate and cement mortar；It is inputted
Mode is as shown in Fig. 2 including two kinds of input modes, i.e., the GUI modes shown in Fig. 2 input；Parametric program language shown in Fig. 3
Input.
Step 2: modeling and mesh generation：
User can voluntarily select the method for establishing geometrical model according to demand.Because the aggregate being generally modeled has one
Fixed grading, its size is different and has suitable randomness, while the Size Distribution of aggregate can also be to cement mortar
Geometry is impacted, therefore mesh generation is divided using the smart grid in APDL system frameworks.Such as Fig. 4, Fig. 5, Fig. 6 institute
Show, by smart grid division operation, can be processed the FEM model of object, i.e., model partition is passed through into section for limited
Point is connected and has been assigned the model that the unit of different materials attribute is formed, the unit after dividing be linear elasticity unit and
It is respectively provided with the function of element death and birth；
Step 3: solving model：As shown in figure 1, solving model actually comprises the following steps：First according to defeated in step 1
The load mode entered, load is divided into some loads and walked, then sequentially loaded；The information of equal reading unit after the completion of loading every time,
Specifically, the information of unit of the present invention includes respectively answering to shearing stress, first principal stress and the 3rd master inside unit
Power, analysis judgement is then carried out to unit according to the information of acquisition, if unit meets the condition destroyed, kills the unit,
Enter back into next load step subsequently to be solved, until loading is completed；Kill unit, element death and alive is all in APDL softwares
Term, from the operation KILL of software inhouse；This operation is first to be multiplied by the attribute of unit in itself one very small to be
Number (system default is 10 minus 14 power, can also be by user's sets itself), this unit is then allowed to participate in calculating again；This
The benefit of sample is, after killing unit, killed unit actually also in this position, can ensure that follow-up calculate continues to examine
Consider this unit, and be unlikely to because the iterative calculation that occurs being mutated and causing internal system can not continue, but again because
Have been multiplied by having gone up a very small coefficient in itself for unit, so its contribution for overall calculation is small to can ignore not
Meter, so as to form the effect of " as without this unit ".
Step 4: result exports：
User can voluntarily select the mode of output result according to demand in APDL frameworks, and obtaining result includes two classes：
One kind is the data result of concrete macro-indicators, including the intensity of concrete, modulus of elasticity, load-displacement curve；It is another kind of
It is the mechanical behavior and destructive process of concrete.The Z-direction strain cloud atlas of output is illustrated in figure 7, Fig. 8, Fig. 9 are the destructions of output
Aspect graph, Figure 10 are the load-displacement curve figures of output.
Embodiment two：Present embodiment is unlike embodiment one：It is single described in the step 3
Member meets that the condition of destruction is specially：
The material of each component of concrete is judged respectively；
(1) aggregate unit is judged：Aggregate unit remains elastic stage during analysis, and aggregate unit is not
Meet the condition destroyed；
(2) cement mortar unit is judged：Principal tensile stress inside cement mortar unit exceedes the cement of input
During the compression strength for the cement mortar that the principal compressive stress inside the tensile strength or cement mortar unit of mortar exceedes input, meet
The condition of destruction, then kill the unit；Wherein, principal tensile stress be that numerical value is larger in first principal stress and third principal stress one
Individual, if first principal stress and third principal stress symbol are negative, principal tensile stress value is 0；Principal compressive stress is first principal stress
One less with numerical value in third principal stress, if first principal stress and third principal stress symbol are just principal compressive stress value
It is taken as 0；
(3) boundary element between aggregate and cement mortar is judged：When boundary element between aggregate and cement mortar
Interior principal tensile stress, the shearing stress of either direction meet any one in following inequality group, then meet the condition destroyed, and
Kill the unit：
Wherein, τ is shearing stress；σ is principal stress in unit, σ be equal in first principal stress and third principal stress absolute value compared with
Big one；The cohesive force at c interfaces between aggregate and cement mortar；The friction at φ interfaces between aggregate and cement mortar
Angle；The tensile strength at χ interfaces between aggregate and cement mortar；σtensileFor principal tensile stress；F is between aggregate and cement mortar
The shearing strength at interface.
Other steps and parameter are identical with embodiment one.
Embodiment
Beneficial effects of the present invention are verified using following examples：
Step 1: parameter inputs.
The parameter for needing to input includes the material properties of concrete each component and the load mode of test specimen；The material of each component
Attribute includes：The modulus of elasticity of aggregate, the modulus of elasticity of cement mortar, the tensile strength of cement mortar, the resistance to compression of cement mortar
Intensity, the modulus of elasticity at interface, cohesive force, angle of friction, tensile strength and shearing strength between aggregate and cement mortar；This reality
Apply example to input using GUI modes as shown in Figure 2, each parameter values of input are as follows：
The relevant material properties numerical value of the elastic range of form 1
It is constrained and load mode is：Bottom surface joint constraint whole displacement；Apply axially pressure load.
Step 2: modeling and mesh generation.
Geometrical model as shown in Figure 4, wherein aggregate fraction geometrical model are established as shown in figure 5, using APDL system frameworks
Interior smart grid division is operated, and model partition (is passed through section by the FEM model dealt with objects for limited
Point is connected and has been assigned the model that the unit of different materials attribute is formed), its mesh generation effect is as shown in Figure 4.It is aobvious
Show effect, Fig. 6 conceals Partial Mesh, and the unit after dividing is accordingly to be regarded as linear elasticity unit and is respectively provided with the work(of element death and birth
Energy.
Step 3: solving model.
As shown in figure 1, first load is divided into some loads and walked, then is sequentially added according to the load mode inputted in step 1
Carry；The equal information of reading unit after the completion of loading every time, the information of the unit are included inside unit respectively to shearing stress, the
One principal stress and third principal stress, analysis judgement is then carried out to unit according to the information of acquisition, if unit meets what is destroyed
Condition, then the unit is killed, enter back into next load step and subsequently solved, until loading is completed.
Unit meets that the condition of destruction is specially：
The material of each component of concrete is judged respectively；
(1) aggregate unit is judged：Aggregate unit remains elastic stage during analysis, and aggregate unit is not
Meet the condition destroyed；
(2) cement mortar unit is judged：Principal tensile stress inside cement mortar unit exceedes the cement of input
During the compression strength for the cement mortar that the principal compressive stress inside the tensile strength or cement mortar unit of mortar exceedes input, meet
The condition of destruction, then kill the unit；Wherein, principal tensile stress be in first principal stress and third principal stress symbol be just, numerical value
Larger one, if first principal stress and third principal stress symbol are negative, principal tensile stress value is 0；Principal compressive stress is
Symbol is larger one of negative, absolute value in one principal stress and third principal stress, if first principal stress and third principal stress symbol
It is that just, then principal compressive stress value is taken as 0；
(3) boundary element between aggregate and cement mortar is judged：When boundary element between aggregate and cement mortar
Interior principal tensile stress, the shearing stress of either direction meet any one in following inequality group, then meet the condition destroyed, and
Kill the unit：
Specific implementation can realize that part false code is as follows by command stream：
Module four：As a result export.
User can voluntarily select the mode of output result according to demand in APDL frameworks, and the present embodiment exports what is obtained
Modulus of elasticity of concrete is 361MPa, intensity 38.49MPa；If Fig. 7 is by shaft pressuring load by obtained concrete of the invention
Under effect, the strain cloud atlas of the axial direction (i.e. Z-direction) after final destruction；If Fig. 8, Fig. 9 are that the concrete obtained using the present invention is stood
Square damage -form figure；If Figure 10 is using obtained load-displacement curve figure of the invention.
The present invention can also have other various embodiments, in the case of without departing substantially from spirit of the invention and its essence, this area
Technical staff works as can make various corresponding changes and deformation according to the present invention, but these corresponding changes and deformation should all belong to
The protection domain of appended claims of the invention.
Claims (2)
- A kind of 1. concrete meso-mechanical model analysis method based on APDL language developments, it is characterised in that methods described include with Lower step：Step 1: parameter inputs：The parameter for needing to input includes the material properties of concrete each component and the load mode of test specimen； The material of each component includes：Interface between aggregate, cement mortar and aggregate and cement mortar；The material properties bag of each component Include：The modulus of elasticity of aggregate, the modulus of elasticity of cement mortar, the tensile strength of cement mortar, the compression strength of cement mortar, bone Modulus of elasticity, cohesive force, angle of friction, tensile strength and the shearing strength at interface between material and cement mortar；Step 2 |, modeling and mesh generation：Mesh generation is divided using the smart grid in APDL system frameworks, by smart grid division operation, is dealt with objects FEM model, i.e., model partition is connected by node to be limited and has been assigned the unit institute group of different materials attribute Into model, the unit after dividing is linear elasticity unit and is respectively provided with the function of element death and birth；Step 3: solving model：First according to the load mode inputted in step 1, load is divided into some loads and walked, then sequentially Loading；The equal information of reading unit after the completion of loading every time, the information of the unit include inside unit respectively to shearing stress, First principal stress and third principal stress, analysis judgement is then carried out to unit according to the information of acquisition, if unit meets to destroy Condition, then kill the unit, enter back into next load step and subsequently solved, until loading completion；Step 4: result exports：User can voluntarily select the mode of output result according to demand in APDL frameworks, and obtaining result includes two classes：It is a kind of It is the data result of concrete macro-indicators, including the intensity of concrete, modulus of elasticity, load-displacement curve；Another kind of is mixed Coagulate the mechanical behavior and destructive process of soil.
- 2. a kind of concrete meso-mechanical model analysis method based on APDL language developments according to claim 1, its feature It is, the condition that unit described in step 3 meets to destroy is specially：The material of each component of concrete is judged respectively；(1) aggregate unit is judged：Aggregate unit remains elastic stage during analysis, and aggregate unit is unsatisfactory for The condition of destruction；(2) cement mortar unit is judged：Principal tensile stress inside cement mortar unit exceedes the cement mortar of input Tensile strength or cement mortar unit inside principal compressive stress exceed input cement mortar compression strength when, meet destroy Condition, then kill the unit；Wherein, principal tensile stress be that numerical value is larger in first principal stress and third principal stress one, if First principal stress and third principal stress symbol are negative, then principal tensile stress value is 0；Principal compressive stress is first principal stress and the 3rd Less one of numerical value in principal stress, if first principal stress and third principal stress symbol are that just, principal compressive stress value is taken as 0；(3) boundary element between aggregate and cement mortar is judged：When between aggregate and cement mortar in boundary element Principal tensile stress, the shearing stress of either direction meet any one in following inequality group, then meet the condition destroyed, and kill The unit：<mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <msup> <mi>&tau;</mi> <mn>2</mn> </msup> <mo>&GreaterEqual;</mo> <msup> <mrow> <mo>(</mo> <mi>&sigma;</mi> <mo>-</mo> <mi>c</mi> <mi> </mi> <mi>t</mi> <mi>a</mi> <mi>n</mi> <mi>&phi;</mi> <mo>)</mo> </mrow> <mn>2</mn> </msup> <mo>-</mo> <msup> <mrow> <mo>(</mo> <mi>&chi;</mi> <mo>-</mo> <mi>c</mi> <mi> </mi> <mi>t</mi> <mi>a</mi> <mi>n</mi> <mi>&phi;</mi> <mo>)</mo> </mrow> <mn>2</mn> </msup> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>&sigma;</mi> <mrow> <mi>t</mi> <mi>e</mi> <mi>n</mi> <mi>s</mi> <mi>i</mi> <mi>l</mi> <mi>e</mi> </mrow> </msub> <mo>&GreaterEqual;</mo> <mi>&chi;</mi> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mi>&tau;</mi> <mo>&GreaterEqual;</mo> <mi>f</mi> </mrow> </mtd> </mtr> </mtable> </mfenced>Wherein, τ is shearing stress；σ is principal stress in unit, and it is larger that σ is equal to absolute value in first principal stress and third principal stress One；The cohesive force at c interfaces between aggregate and cement mortar；The angle of friction at φ interfaces between aggregate and cement mortar；χ is The tensile strength at interface between aggregate and cement mortar；σtensileFor principal tensile stress；F interfaces between aggregate and cement mortar Shearing strength.
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| CN110414076A (en) * | 2019-07-08 | 2019-11-05 | 东南大学 | A kind of modeling method for the concrete meso-mechanical model considering water pocket influence |
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| CN106021755A (en) * | 2016-05-26 | 2016-10-12 | 中国核工业第二二建设有限公司 | Simulation analysis method for temperature stress of mass concrete in raft foundations of nuclear island of nuclear power station |
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| CN206591386U (en) * | 2017-01-16 | 2017-10-27 | 湖南大学 | A kind of embedding stone structure between ultra-high performance concrete surface and upper layer |
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| CN105956241A (en) * | 2016-04-25 | 2016-09-21 | 长安大学 | Method for determining grouting material performance of void beneath cement-concrete road slab |
| CN106021755A (en) * | 2016-05-26 | 2016-10-12 | 中国核工业第二二建设有限公司 | Simulation analysis method for temperature stress of mass concrete in raft foundations of nuclear island of nuclear power station |
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