CN107862165A - A kind of multi-level method for numerical simulation for reinforced concrete factory plant security evaluation - Google Patents
A kind of multi-level method for numerical simulation for reinforced concrete factory plant security evaluation Download PDFInfo
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- CN107862165A CN107862165A CN201711313995.7A CN201711313995A CN107862165A CN 107862165 A CN107862165 A CN 107862165A CN 201711313995 A CN201711313995 A CN 201711313995A CN 107862165 A CN107862165 A CN 107862165A
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Abstract
The present invention discloses a kind of multi-level method for numerical simulation for reinforced concrete factory plant security evaluation, including the overall numerical simulation with two levels of key member in factory building of factory building, first according to the practical structures information of reinforced concrete factory plant, establish the overall beam element model of factory building, the stress time-histories of each component is arranged, determines key member in factory building；Then local detail model is established to key member, existing defect damage is introduced, determines the Damage constitutive relation of key member, obtain revised local detail model；Based on revised local detail model, consider the damage development process of the dynamic effect simulation key member of crane moving process, its structure deterioration procedural information is obtained, available for factory building security evaluation.The present invention establishes the model of steel reinforced concrete factory building by Multiscale Simulation Method, it is contemplated that the influence that damage development caused by defect deteriorates to structural behaviour in existing steel reinforced concrete factory building, security evaluation and the transformation reinforcing process of the steel reinforced concrete factory building that is particularly suitable for use in.
Description
Technical field
The present invention discloses a kind of method of reinforced concrete structure security evaluation, and in particular to one kind is used for armored concrete
The multi-level method for numerical simulation of factory building security evaluation, belong to reinforced concrete structure security evaluation and performance degradation process simulation
Field.
Background technology
In the safety evaluation method of existing reinforced concrete structure, most of is all the analysis of elasticity, is seldom related to material
The breakdown diagnosis of material, can not more consider it is defective caused by structural damage develops and assess its to structural behaviour deteriorate shadow
Ring, meet this requirement so needing to develop new method.Moreover, the space scale of reinforced concrete factory plant is larger, it is actual
There is multi-stratification in structural behaviour deterioration process, therefore be also required to hierarchy simulation side of the development for reinforced concrete factory plant
Method.
The content of the invention
Goal of the invention：Do not consider material damage and existing structure defect to structural behaviour shadow for existing safety evaluation method
The shortcomings that ringing, the present invention provide a kind of multi-level method for numerical simulation for reinforced concrete factory plant security evaluation, this method
The defective influence to structural behaviour cracking is considered, the reinforced concrete factory plant structural behaviour to bearing military service load
Deterioration process carries out numerical simulation.
Technical scheme：A kind of multi-level numerical simulation side for reinforced concrete factory plant security evaluation of the present invention
Method, including the overall numerical simulation with two levels of key member in factory building of factory building, specifically comprise the following steps：
Step 1, according to the practical structures information of reinforced concrete factory plant, the overall beam element model of factory building is established, is arranged
The stress time-histories of wherein each concrete component, analysis determine key member in factory building；
Step 2, local detail model is established to the key member of identification, introduces existing defect damage, determine key member
Damage constitutive relation, obtain revised local detail model；
Step 3, based on revised local detail model, consider that the dynamic effect of crane moving process simulates key member
Damage development process, obtain its structure deterioration procedural information, the information can be used for factory building security evaluation.
In above-mentioned steps 1, the determination method of key member is：Actual crane is applied to the overall beam element model of factory building
Load, using the stress time-histories for influenceing each concrete component dangerouse cross-section in line method acquisition factory building, analyze stress result, coagulation
The maximum position of stress level and stress amplitude is the integrally-built dangerous position of factory building in native component, structure where the dangerous position
Part is key member.
In above-mentioned steps 2, local detail model is established by equivalent-simplification mode, due to different parts in key member
Stress level and stress amplitude situation are uneven, three parts of equivalent-simplification point of local detail model：
(1) secondary member in addition to key member in overall beam element model is ignored；
(2) simulated for the not dangerous position of key member using beam element；
(3) dangerous position in key member is simulated using solid element, reinforcing bar is simulated with truss element.
After establishing local detail model, having in practical structures is introduced into the model using continuum damage mechanics theory
Defect, the material stiffness reduction caused by defect and evolutionary process are described, obtains revised local detail model, that is, consider to lack
Sunken local detail model.
Introducing defective method is：
(1) defect introduces position：Based on the true degree of impairment in image, by corresponding unit in local detail model
Stiffness degradation simulate defective damage；
(2) determination of material properties：If the damage of existing fault location has reached the critical value of destruction, after reduced rigidity
Elastic constitutive relation simulate；Damage Constitutive simulation damage development determined by the solid element use at remaining zero defect position
Process；The reinforcing bar damage being embedded in concrete is ignored, and is simulated with undamaged reinforcing bar elastic constitutive model；For key member
Not dangerous position, calculated using this structure of concrete elastic；
(3) fault location cell attribute：For the yardstick that mainly occurs in reinforced concrete factory plant decimeter grade macroscopical table
Planar defect, the cell type of fault location in overall beam element model with being consistent.
In above-mentioned steps 3, apply equivalent crane load to revised local detail model, pass through finite element analysis mould
Intend defective caused key member damage development process and the stress time-histories of dangerous position in crane moving process, closed
The structure deterioration procedural information of key component.
Beneficial effect：Compared with prior art, remarkable advantage of the invention is that the present invention passes through Multiscale Simulation Method
The model of reinforced concrete factory plant is established, on the basis of being simulated to factory building overall structure, emphasis simulates crucial structure in factory building
Part, while introduce defective, it is contemplated that the shadow that damage development caused by defect deteriorates to structural behaviour in existing steel reinforced concrete factory building
Ring；In addition, considering the dynamic effect of crane moving process during damage development, model configuration is more accurate, is particularly suitable for use in
The security evaluation of reinforced concrete factory plant and transformation reinforcing process.
Brief description of the drawings
Fig. 1 is to carry out structural behaviour deterioration to reinforced concrete factory plant using the multi-level method for numerical simulation of the present invention to comment
The frame diagram estimated；
Fig. 2 is the overall beam element model figure for the steel reinforced concrete factory building established in embodiment, wherein, Fig. 2 (a) is whole factory building
FEM model figure, Fig. 2 (b) are the FEM model figure of factory building longitudinal direction, and Fig. 2 (c) is the FEM model of factory building horizontal frame
Figure；
Fig. 3 is the stress time-histories figure of each component in the factory building arranged in embodiment；
Fig. 4 is the local detail illustraton of model for the key member established in embodiment；
Fig. 5 is the local detail illustraton of model introduced in embodiment after existing defect damage；
Fig. 6 is the crane dynamic respond time-histories figure that crane load dynamic effect is studied in embodiment；
Fig. 7 is the damage development process cloud atlas for the key member crane girder simulated in embodiment, wherein, Fig. 7 (a)~7 (d)
Represent to inscribe the degree of impairment of crane girder respectively during the effect of different crane load；
Fig. 8 is the span centre bottom reinforcement bars stress time-histories figure calculated in embodiment.
Embodiment
Technical scheme is described further below in conjunction with the accompanying drawings.
A kind of multi-level method for numerical simulation for reinforced concrete factory plant security evaluation of the present invention, the multilayer number
Being worth analogy method includes the overall numerical simulation with two levels of key member in factory building of factory building, and this method is in continuous damage
In mechanics, finite element simulation scheduling theory and technical foundation, the entirety of reinforced concrete factory plant is established by Multiscale Simulation Method
The local detail model of model and key member, meanwhile, this method consider in steel reinforced concrete factory building it is both defective caused by damage drilled
Change the influence to structural behaviour deterioration, the structure deterioration procedural information finally obtained can be used for the safety of reinforced concrete factory plant to comment
Estimate and transform reinforcing, model can be also updated according to transformation reinforcement means feedack and new testing result, such as
Fig. 1.
Embodiment
By taking certain reinforced concrete factory plant as an example, to a kind of multilayer for reinforced concrete factory plant security evaluation of the present invention
Secondary method for numerical simulation illustrates.
Step 1, according to the practical structures information of steel reinforced concrete factory building, overall beam element model is established, by each concrete structure
The arrangement of part stress time-histories, determines key member.
Such as Fig. 1, the practical structures information of steel reinforced concrete factory building include physical dimension, material parameter, component arrangement, loading,
Existing defect information etc.；The main points for establishing overall beam element model are：Ignore the structure secondary member such as wind-resistant column, exterior wall, emphasis
Consider the primary structural members such as beam, post, column braces；The overall beam element model such as Fig. 2 finally established.
Then actual crane load is applied to the overall beam element model of factory building, each coagulation is obtained using line method is influenceed
The stress time-histories of native component dangerouse cross-section, such as Fig. 3, the dangerous position of key member is can determine that by comparing stress, by stress knot
Fruit analysis is learnt：In concrete component, crane beam end portion section, the stress level of girder span middle section and stress amplitude are maximum, its
Secondary is upper prop basal cross section and lower prop bottom section；Crane beam end portion section, girder span middle section and upper prop basal cross section are overall structures
Dangerous position, i.e., crane girder and bracket composition part be steel reinforced concrete factory building key member.
Step 2, local detail model is established to the key member identified, existing defect damage is introduced, it is determined that crucial structure
The Damage constitutive relation of part, revised local detail model is obtained, that is, consider the local detail model of defect；
Local detail model can be established to the key member identified by way of equivalent-simplification, due in key member
The stress level and stress amplitude situation of different parts are uneven, three parts of equivalent-simplification point：
1. ignoring diagonal brace, roof truss system, bracket top pillar grade wants component；
2. simulated for not dangerous position bracket lower pillar using beam element；
3. being simulated to dangerous position at bracket node, crane girder two using solid element, reinforcing bar is simulated with truss element.It is false
Determine to connect between different units that good, displacement coordination is consistent, then connected between beam element and solid element using multi-point constraint method
Take over and cross, constrained between reinforcing bar unit and concrete solid unit using embedded methods.The local detail model of acquisition is as schemed
4。
Defective true damage information introducing method has following main points：
1. defect introduces position：True degree of impairment based on Site Detection result, by local detail model top flange across
The rigidity of middle edge unit carries out corresponding reduction, defective to simulate with this, such as Fig. 5.
2. the determination of material properties：Assuming that the damage of existing fault location has reached the critical value of destruction, that is, damage and no longer send out
Exhibition, approximate it can be simulated with the elastic constitutive relation after reduced rigidity；The solid element at remaining zero defect position is damaged using plasticity
Hinder the process of constitutive modeling damage development；The reinforcing bar damage being embedded in concrete can be neglected, therefore elastic with undamaged reinforcing bar
Constitutive modeling；In addition, for the not dangerous position of key member, calculated using this structure of concrete elastic.
3. the cell attribute of fault location：Defective in Site Detection result belongs to macroscopic irregularity, yardstick point
Meter level, so mesh refinement need not be carried out.The cell type of fault location is consistent with overall, is the node list of hexahedron eight
Member.
Step 3, consider the dynamic effect of crane moving process, apply equivalent crane to revised local detail model
Load, by the damage development process of FEM Numerical Simulation key member and the stress time-histories of dangerous position, obtain crucial structure
The structure deterioration procedural information of part, the deterioration process information obtained can be used to carry out security evaluation.
Fig. 6 provides each group comparative result of crane maximum vertical displacement.It can be seen that the dynamic effect pair of crane load
Structural response has a significant impact, and dynamic effect makes displacement peak value add about 6%, so the present invention is in simulation process
It take into account the effect of dynamic effect.
Fig. 7 (a)~7 (d) provide it is defective caused by key member damage development process, it is specific as follows：
1. crane is run to 1.57s, crane girder bottom starts the damage and failure for concrete occurred, forms initial
First crack.Damage and failure scope very little now, crack does not extend into web also.
2. continuing to run with 0.14s, incipient crack extends to rapidly web, is no longer extended in 2/3 opening position of web, and
The length is maintained to terminate to loading always.Second crack of bottom starts to germinate, and direction is basically parallel to the first crack.
3. when crane is run to 3s, now the run time of crane is more than half, in addition to some long cracks, have also appeared
Obvious diagonal crack (crack that numbering is VII in such as Fig. 7 (d)), but its length is relatively short.
4. after loading terminates, it is observed that there are 8 relatively long cracks altogether, between these long cracks
It is mingled with many intensive short cracks, their fractuer direction is substantially parallel.
Fig. 8 provides the stress time-histories of span centre bottom reinforcement bars.It can be seen that in figure, reinforcing bar 2-2 position and existing fault location
At the same side, the stress level peak value of reinforcing bar improves 19.4%, i.e., the structural behaviour degradation speed of defective effect is
Original 1.2 times, existing damage can effectively be simulated to steel reinforced concrete mill construction performance degradation mistake by illustrating the method for the present invention
The acceleration of journey.
Claims (6)
1. a kind of multi-level method for numerical simulation for reinforced concrete factory plant security evaluation, it is characterised in that this is multi-level
Method for numerical simulation includes the overall numerical simulation with two levels of key member in factory building of factory building, specifically includes following step
Suddenly：
Step 1, according to the practical structures information of reinforced concrete factory plant, the overall beam element model of factory building is established, is arranged wherein
The stress time-histories of each concrete component, analysis determine key member in factory building；
Step 2, local detail model is established to the key member of identification, introduces existing defect damage, determine the damage of key member
Hinder constitutive relation, obtain revised local detail model；
Step 3, based on revised local detail model, consider that the dynamic effect of crane moving process simulates the damage of key member
Hinder evolutionary process, its structure deterioration procedural information is obtained, for factory building security evaluation.
2. the multi-level method for numerical simulation according to claim 1 for reinforced concrete factory plant security evaluation, it is special
Sign is, in step 1, the determination method of the key member is：Actual crane is applied to the overall beam element model of factory building
Load, using the stress time-histories for influenceing each concrete component dangerouse cross-section in line method acquisition factory building, analyze stress result, coagulation
The maximum position of stress level and stress amplitude is the integrally-built dangerous position of factory building in native component, structure where the dangerous position
Part is key member.
3. the multi-level method for numerical simulation according to claim 2 for reinforced concrete factory plant security evaluation, it is special
Sign is, in step 2, the local detail model, the equivalent-simplification point of local detail model are established by equivalent-simplification mode
Three parts：
(1) secondary member in addition to key member in overall beam element model is ignored；
(2) simulated for the not dangerous position of key member using beam element；
(3) dangerous position in key member is simulated using solid element, reinforcing bar is simulated with truss element.
4. the multi-level method for numerical simulation according to claim 2 for reinforced concrete factory plant security evaluation, it is special
Sign is, in step 2, is introduced into using continuum damage mechanics theory in the local detail model scarce in practical structures
Fall into, describe the material stiffness reduction caused by defect and evolutionary process, obtain revised local detail model.
5. the multi-level method for numerical simulation according to claim 4 for reinforced concrete factory plant security evaluation, it is special
Sign is, is introduced according to following methods in the local detail model defective：
(1) defect introduces position：Based on the true degree of impairment in image, by local detail model corresponding unit it is firm
Reduction is spent to simulate defective damage；
(2) determination of material properties：Assuming that the damage of existing fault location has reached the critical value of destruction, with the bullet after reduced rigidity
Property constitutive relation is simulated；The mistake of Damage Constitutive simulation damage development determined by the solid element use at remaining zero defect position
Journey；The reinforcing bar damage being embedded in concrete is ignored, and is simulated with undamaged reinforcing bar elastic constitutive model；For the non-danger of key member
Dangerous position, calculated using this structure of concrete elastic；
(3) fault location cell attribute：For the yardstick that occurs in reinforced concrete factory plant in the macroscopic irregularity of decimeter grade, lack
The cell type at place is fallen into being consistent in overall beam element model.
6. the multi-level method for numerical simulation according to claim 2 for reinforced concrete factory plant security evaluation, it is special
Sign is, in step 3, applies equivalent crane load to the revised local detail model, passes through finite element analysis mould
Intend defective caused key member damage development process and the stress time-histories of dangerous position in crane moving process, closed
The structure deterioration procedural information of key component.
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| CN113821854A (en) * | 2021-09-16 | 2021-12-21 | 中国建筑第八工程局有限公司 | Method for repairing existing industrial factory building production equipment |
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