CN112883600A - Construction method of steel pipe concrete member overall and local damage joint evaluation model - Google Patents

Construction method of steel pipe concrete member overall and local damage joint evaluation model Download PDF

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CN112883600A
CN112883600A CN202110034099.7A CN202110034099A CN112883600A CN 112883600 A CN112883600 A CN 112883600A CN 202110034099 A CN202110034099 A CN 202110034099A CN 112883600 A CN112883600 A CN 112883600A
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刘艳辉
王路明
赵世春
徐楠
杨浪
晏兴宇
吴俊杰
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Southwest Jiaotong University
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Abstract

The invention discloses a construction method of a concrete filled steel tube member overall and local damage joint evaluation model, which comprises the steps of calculating the overall deformation and residual bearing capacity of the concrete filled steel tube member under each group of impact working conditions; calculating the overall damage evaluation index of the concrete-filled steel tube member; selecting an impact working condition that the overall damage evaluation index is equal to the overall damage boundary point, and drawing an overall damage evaluation curve corresponding to each overall damage boundary point; selecting any point on the overall damage evaluation curve as total energy consumption, and taking the numerical value of a horizontal asymptote as the overall energy consumption; acquiring a preset local damage evaluation index, and calculating a local damage dividing point on each overall damage evaluation curve by combining a local damage evaluation model; and connecting local damage dividing points corresponding to the same local damage evaluation index to serve as local damage evaluation curves, and forming a whole and local damage combined evaluation model by adopting a plurality of damage grades formed by the whole damage evaluation curve and the local damage evaluation curve.

Description

Construction method of steel pipe concrete member overall and local damage joint evaluation model
Technical Field
The invention belongs to the technical field of impact dynamics of civil engineering structures, and particularly relates to a construction method of a concrete filled steel tube member overall and local damage joint evaluation model and application of the evaluation model.
Background
The steel pipe concrete member is a combined stressed member formed by filling concrete in a steel pipe, and the bearing capacity of the member is greatly improved through the constraint action of the steel pipe on the concrete, so that the steel pipe concrete member is widely applied to high-rise and large-span structures. The steel pipe concrete member is required to bear static load during normal service and also has the capacity of resisting accidental strong dynamic load, once the steel pipe concrete member encounters side impact load such as vehicle impact, falling rock impact, flyer impact and the like, damage and even destruction in different degrees can be generated, and threat is brought to life and property safety of people, so that the anti-impact design of the steel pipe concrete member is particularly important for improving the anti-impact performance of the steel pipe concrete member.
The impact test and the theoretical research of the concrete-filled steel tube member both show that the damage form of the concrete-filled steel tube member under the impact load action comprises integral damage and partial damage, the research on the integral damage is continuously concerned by researchers all the time, the cognition on the partial damage is still in the stage of finding the phenomenon, and the intensive and comprehensive research is carried out, so that a practical method capable of simultaneously evaluating the integral damage and the partial damage of the concrete-filled steel tube member is not formed so far, the damage evaluation result of the concrete-filled steel tube member under the impact load action is not accurate and comprehensive enough, and the effective application of the damage evaluation result in the impact resistance design of the concrete-filled steel tube member is further influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the construction method of the concrete filled steel tube member overall and local damage joint evaluation model and the application of the evaluation model provided by the invention solve the problem that the damage evaluation result is inaccurate because the local damage is not considered in the damage evaluation model in the prior art.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that:
in a first aspect, a method for constructing a concrete filled steel tube member overall and local damage joint assessment model is provided, which includes:
acquiring design parameters of the concrete-filled steel tube member and a plurality of groups of impact working conditions applied to the concrete-filled steel tube member;
calculating by adopting finite element simulation software according to the design parameters and the impact working conditions to obtain the integral deformation and the residual bearing capacity of the concrete-filled steel tube component under each group of impact working conditions;
calculating the overall damage evaluation index of the concrete-filled steel tube member by adopting an overall damage evaluation model in which the concrete-filled steel tube member is unified before and after cracking according to each group of overall deformation and residual bearing capacity;
selecting an impact working condition that the overall damage evaluation index is equal to the overall damage boundary point, and drawing an overall damage evaluation curve of the concrete-filled steel tube member by adopting all the impact working conditions corresponding to the same overall damage boundary point;
selecting the numerical value of the horizontal asymptote of each overall damage assessment curve as the overall energy consumption of the concrete-filled steel tube component under the action of the impact load, and taking any point on the overall damage assessment curve as the total energy consumption;
acquiring a preset local damage evaluation index, and calculating a local damage dividing point on each overall damage evaluation curve by combining a local damage evaluation model and a relational expression of overall energy consumption, total energy consumption and local energy consumption;
and connecting local damage dividing points corresponding to the same local damage evaluation index to serve as local damage evaluation curves, and forming a whole and local damage combined evaluation model by adopting a plurality of damage grades formed by the crossed whole damage evaluation curve and the local damage evaluation curve.
Further, the calculation formula of the overall damage assessment model is as follows:
Figure BDA0002892786800000021
wherein delta is the maximum deformation of the steel tube concrete member after encountering impact load; deltacraThe critical deformation of the steel tube concrete member when cracking occurs; r' is the residual bearing capacity of the steel pipe concrete member after encountering impact load; rcraThe critical residual bearing capacity of the steel pipe concrete member when cracking occurs; w is the overall damage assessment index.
Further, the calculation formula of the local injury assessment model is as follows:
Figure BDA0002892786800000031
wherein, L is a local damage assessment index; etotalThe total energy consumption is; elocalLocal energy consumption is achieved;
the relation among the overall energy consumption, the total energy consumption and the local energy consumption is as follows: elocal＝Etotal-Egloble，EglobleThe energy consumption is integrated;
the local damage demarcation point is the local energy consumption of the overall damage assessment curve.
Further, the global lesion boundary points include-0.5, 0, and 0.5; the preset local damage assessment indexes comprise 0.05 and 0.1;
the overall damage evaluation curve and the local damage evaluation curve in the same coordinate system divide the overall damage and the local damage of the concrete-filled steel tube component under the impact load action into 8 damage grades, which are respectively as follows:
when W is equal to [ -1, -0.5), the steel tube concrete member is slightly damaged;
when W belongs to [ -0.5,0) and L belongs to (0,0.05), the whole concrete-filled steel tube member has moderate damage and local slight damage;
when W belongs to the range of-0.5, 0) and L belongs to the range of 0.05,0.1), the whole and the part of the steel pipe concrete member are damaged moderately;
when W belongs to the range of-0.5, 0) and L belongs to the range of 0.1,1), the whole concrete-filled steel tube member is damaged moderately and seriously damaged locally;
when W belongs to [0,0.5) and L belongs to (0,0.05), the whole concrete-filled steel tube member is seriously damaged, and the local part of the concrete-filled steel tube member is slightly damaged;
when W belongs to [0,0.5) and L belongs to [0.05,0.1), the whole concrete-filled steel tube member is seriously damaged, and medium damage is locally generated;
when W belongs to [0,0.5) and L belongs to [0.1,1), the whole and local parts of the steel pipe concrete member are seriously damaged;
when W is equal to 0.5,1, the steel pipe concrete member is damaged and failed.
Further, the impact working condition comprises impact body mass and impact kinetic energy; and when the overall damage evaluation curve is drawn, the mass of the impact body is taken as an abscissa, and the impact kinetic energy is taken as an ordinate.
In a second aspect, there is provided a use of a global and local lesion joint assessment model, comprising:
acquiring an impact working condition loaded on a concrete-filled steel tube member with the same design parameters as those of a constructed integral and local damage joint evaluation model;
and determining the overall damage degree and the local damage degree of the concrete-filled steel tube member under the impact working condition according to the impact working condition and the position relation of the overall and local damage joint evaluation model.
The invention has the beneficial effects that:
(1) according to the scheme, the calculation relation from the whole damage to the local damage of the concrete-filled steel tube member is established from the energy consumption angle, the distribution relation of impact kinetic energy between the whole energy consumption and the local energy consumption is disclosed, the problem that the damage evaluation result is inaccurate due to the fact that energy distribution is not considered is solved, and the damage evaluation of the concrete-filled steel tube member under the impact load action is more accurate.
(2) The established integral damage assessment index which is unified before and after cracking is suitable for the damage assessment of the integral deformation and even the cracking state of the concrete-filled steel tube member, and the problem that different damage states of the concrete-filled steel tube member before and after cracking can not be comprehensively assessed by a single damage assessment variable and index is solved.
(3) According to the scheme, according to the characteristics of the local damage of the concrete-filled steel tube member and the corresponding relation between the local energy consumption and the overall energy consumption, the local energy consumption is selected as the local damage assessment variable of the concrete-filled steel tube member, and a local damage assessment model of the concrete-filled steel tube member is established, so that the problem that damage assessment results are incomplete due to the fact that the influence of the overall damage is not considered in the local damage assessment is solved, and the damage assessment of the concrete-filled steel tube member under the impact load effect is more comprehensive.
(4) According to the scheme, a combined evaluation model of the whole damage and the local damage of the concrete-filled steel tube component is established, the whole damage degree and the local damage degree of the concrete-filled steel tube component can be quickly, simply and conveniently evaluated according to the relation between the combined value of the mass of the impact body and the impact kinetic energy under any impact working condition and the combined evaluation model, and the technical blank that the whole damage and the local damage of the concrete-filled steel tube component cannot be simultaneously evaluated in the damage evaluation of the current impact field is filled.
(5) The steel pipe concrete component overall damage and local damage combined evaluation model under the impact load effect established by the scheme has the advantages of strong theoretical performance, high precision, comprehensive evaluation, simplicity, convenience, practicability and the like, can provide important basis for the performance impact resistance design of the steel pipe concrete component, and is beneficial to improving the safety performance of the structure in the service period.
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Fig. 1 is a flow chart of a construction method of a concrete filled steel tube member overall and local damage joint evaluation model.
FIG. 2 is a graph showing the evaluation of the overall damage of a concrete filled steel tube member under impact load.
FIG. 3 is a total damage evaluation curve and a partial damage evaluation curve of a concrete filled steel tube member under an impact load.
FIG. 4 is a combined evaluation model of the overall damage and the local damage of the concrete-filled steel tube component under the impact load.
Fig. 5 is a comparison of an evaluation curve that does not adequately account for localized damage and a damage evaluation curve created by the present invention.
FIG. 6 shows the actual damage of the concrete filled steel tube when the mass m of the impact body is 25kg and the impact kinetic energy E is 19 kJ; wherein, a is a schematic diagram of the initial state of the concrete-filled steel tube member before the impact starts, and b is a schematic diagram of the damage state of the concrete-filled steel tube member after the impact is finished.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
Referring to fig. 1, a flow chart of a method for constructing a combined evaluation model of the whole damage and the local damage of a concrete filled steel tube member is illustrated, and the method 100 includes steps 101 to 107.
In step 101, design parameters of a concrete filled steel tube member and a plurality of sets of impact conditions applied to the concrete filled steel tube member are obtained, wherein the impact conditions include impact mass and impact kinetic energy.
In step 102, according to the design parameters and the impact conditions, calculating by using finite element simulation software to obtain the overall deformation and the residual bearing capacity of the concrete-filled steel tube component under each group of impact conditions.
The design parameters comprise effective length, outer diameter of the steel pipe, inner diameter of the steel pipe, wall thickness of the steel pipe, compression strength of the concrete cube, yield strength of the steel pipe and the like.
In step 103, according to each group of integral deformation and residual bearing capacity, an integral damage evaluation index of the concrete-filled steel tube member is calculated by adopting an integral damage evaluation model in which the concrete-filled steel tube member is unified before and after cracking.
In implementation, the optimal calculation formula of the overall damage assessment model in the scheme is as follows:
Figure BDA0002892786800000071
wherein delta is the maximum deformation of the steel tube concrete member after encountering impact load; deltacraThe critical deformation of the steel tube concrete member when cracking occurs; r' is the residual bearing capacity of the steel pipe concrete member after encountering impact load; rcraThe critical residual bearing capacity of the steel pipe concrete member when cracking occurs; w is the overall damage assessment index.
In step 104, selecting an impact condition of which the overall damage evaluation index is equal to the overall damage boundary point, and drawing an overall damage evaluation curve of the concrete-filled steel tube member by adopting all the impact conditions corresponding to the same overall damage boundary point; and when the overall damage evaluation curve is drawn, the mass of the impact body is taken as an abscissa, and the impact kinetic energy is taken as an ordinate.
In step 105, the numerical value of the horizontal asymptote of each overall damage assessment curve is selected as the overall energy consumption of the concrete-filled steel tube component under the action of the impact load, and any point on the overall damage assessment curve is used as the total energy consumption.
In step 106, a preset local damage assessment index is obtained, and a local damage demarcation point on each overall damage assessment curve is calculated by combining the local damage assessment model and the relational expression of overall energy consumption, total energy consumption and local energy consumption.
In implementation, the calculation formula of the preferable local damage assessment model in the scheme is as follows:
Figure BDA0002892786800000072
wherein, L is a local damage assessment index; etotalThe total energy consumption is; elocalLocal energy consumption is achieved;
the relation among the overall energy consumption, the total energy consumption and the local energy consumption is as follows: elocal＝Etotal-Egloble，EglobleThe energy consumption is integrated;
the local damage demarcation point is the local energy consumption of the overall damage assessment curve.
In step 107, the local damage dividing points corresponding to the same local damage assessment index are connected as local damage assessment curves, and a plurality of damage levels formed by the intersected overall damage assessment curve and the local damage assessment curves are adopted to form an overall and local damage joint assessment model.
In one embodiment of the invention, the global lesion boundary points include-0.5, 0, and 0.5; the preset local damage assessment indexes comprise 0.05 and 0.1;
the overall damage evaluation curve and the local damage evaluation curve in the same coordinate system divide the overall damage and the local damage of the concrete-filled steel tube component under the impact load action into 8 damage grades, which are respectively as follows:
when W is equal to [ -1, -0.5), the steel tube concrete member is slightly damaged;
when W belongs to [ -0.5,0) and L belongs to (0,0.05), the whole concrete-filled steel tube member has moderate damage and local slight damage;
when W belongs to the range of-0.5, 0) and L belongs to the range of 0.05,0.1), the whole and the part of the steel pipe concrete member are damaged moderately;
when W belongs to the range of-0.5, 0) and L belongs to the range of 0.1,1), the whole concrete-filled steel tube member is damaged moderately and seriously damaged locally;
when W belongs to [0,0.5) and L belongs to (0,0.05), the whole concrete-filled steel tube member is seriously damaged, and the local part of the concrete-filled steel tube member is slightly damaged;
when W belongs to [0,0.5) and L belongs to [0.05,0.1), the whole concrete-filled steel tube member is seriously damaged, and medium damage is locally generated;
when W belongs to [0,0.5) and L belongs to [0.1,1), the whole and local parts of the steel pipe concrete member are seriously damaged;
when W is equal to 0.5,1, the steel pipe concrete member is damaged and failed.
The scheme also provides an application of the overall and local damage joint assessment model, which comprises the following steps:
acquiring an impact working condition loaded on a concrete-filled steel tube member with the same design parameters as those of a constructed integral and local damage joint evaluation model;
and determining the overall damage degree and the local damage degree of the concrete-filled steel tube member under the impact working condition according to the impact working condition and the position relation of the overall and local damage joint evaluation model.
The construction process of the overall and local damage joint assessment model according to the present embodiment is described in detail below with reference to specific examples:
as shown in fig. 6, taking an example that a round steel tube concrete member used in a certain test encounters an impact load during a midspan, the round steel tube concrete member includes concrete 1, a steel tube 2 and a support 4, a square block on the steel tube 2 is an impact body 3, in fig. 6b, a region corresponding to a number 5 indicates that the steel tube 2 is locally severely damaged under the action of the impact body 3, and a region corresponding to a number 6 indicates that the steel tube 2 is wholly deformed but not cracked under the action of the impact body 3.
The design parameters of the concrete-filled steel tube member are as follows: the effective length is 1200mm, the outer diameter of the steel pipe is 114mm, the inner diameter of the steel pipe is 107mm, the wall thickness of the steel pipe is 3.5mm, the compressive strength of the concrete cube is 48.7MPa, the yield strength of the steel pipe is 298MPa, and both ends are fixed boundary conditions.
1. Calculation relation from energy consumption angle to overall damage to local damage of concrete-filled steel tube member
(1) Fitting a global damage assessment curve
According to design parameters of the concrete-filled steel tube component, a three-dimensional finite element model is established in finite element software LS-DYNA, then physical and mechanical parameters, boundary conditions, constitutive relations, contact algorithms and the like of the concrete-filled steel tube component are input into the finite element model, the quality and the impact speed of an impact body are set, finally LS-DYNA is started to carry out numerical simulation on the impact process, the overall deformation delta (if the component is not cracked) and the residual bearing capacity R' (if the component is cracked) of the concrete-filled steel tube component can be extracted after calculation is finished, and in addition, animation simulation of the whole impact process and the final damage form of the concrete-filled steel tube component can be checked in software.
The combined value of the mass m of the impact body and the impact kinetic energy E is changed continuously, calculation needs to be carried out once in LS-DYNA software every time the combined value of the mass m of the impact body and the impact kinetic energy E is changed, the obtained integral deformation delta or the residual bearing capacity R' of the concrete-filled steel tube component extracted after the calculation is finished is substituted into an integral damage assessment model which is unified before and after cracking, a corresponding W value is calculated, therefore, the combination of a plurality of the mass m of the impact body and the impact kinetic energy E corresponding to the condition that the mass m of the impact body and the impact kinetic energy E are input into the LS-DYNA software can be obtained by changing the mass m of the impact body and the impact kinetic energy E continuously, and the integral damage assessment curve of the concrete-filled steel tube component under the action of impact load is obtained by fitting in a coordinate system with the mass m of the impact body as an abscissa and the impact kinetic energy E as ordinate, wherein the mass m of the impact body is 0.5, the mass m of the.
A large number of finite element calculations were performed on the concrete filled steel tube member selected in this example to obtain combinations of the mass m and the impact kinetic energy E corresponding to 16 groups of the concrete filled steel tube members W equal to-0.5, combinations of the mass m and the impact kinetic energy E corresponding to 16 groups of the concrete filled steel tube members W equal to 0, and combinations of the mass m and the impact kinetic energy E corresponding to 15 groups of the concrete filled steel tube members W equal to 0.5, respectively, and the combinations were plotted in a coordinate system having the mass m of the impact body as an abscissa and the impact kinetic energy E as an ordinate, and then overall damage assessment curves corresponding to W equal to-0.5, W equal to 0, and W equal to 0.5 were obtained by fitting, respectively, as shown in fig. 2.
(2) Obtaining integral energy consumption E corresponding to integral damagegloble
For the concrete filled steel tube member of the present example, the horizontal asymptotes E of the 3 total damage evaluation curves corresponding to W-0.5, W-0, and W-0.5 can be obtained by referring to fig. 2W＝-0.5＝8.0、EW＝0＝15.5、EW＝0.522.2, the local energy consumption of the steel tube concrete member is E due to the stagelocalIs very small and can be ignored, so the numerical value of 3 horizontal asymptotes is the integral energy consumption E of the component when a specific integral damage degree occursglobleTherefore, the total energy consumption of the concrete filled steel tube member of this example under the impact load when W is-0.5, W is 0, and W is 0.5 is respectively: egloble，W＝-0.5＝8.0kJ、Egloble，W＝0＝15.5kJ、Egloble，W＝0.5＝22.2kJ。
(3) Calculating local energy consumption E corresponding to local damagelocal
W＝-0.5、The ordinate of any point on the overall damage evaluation curve corresponding to the case where W is 0 and W is 0.5 is the total energy consumption E of the concrete filled steel tube member at the specific damage degreetotal(Overall energy consumption E)globleAnd local energy consumption ElocalSum), therefore, the local energy consumption E corresponding to the local damage under any impact working condition when a specific damage degree occurs can be calculatedlocal＝Etotal-Egloble。
According to total energy consumption EtotalAnd local energy consumption ElocalEstablishing a local damage evaluation model of the concrete-filled steel tube component under the action of impact load:
Figure BDA0002892786800000111
the smaller the local damage evaluation index L is, the lower the local damage degree of the concrete-filled steel tube member is; conversely, the larger the local damage evaluation index L, the higher the degree of local damage of the concrete-filled steel tube member. The local damage degree of the concrete-filled steel tube member under the impact load can be quantitatively described through the size of the dimensionless quantity L.
2. Establishing a combined evaluation model for overall and local damage of a concrete filled steel tube member
(1) Fitting a local injury assessment curve
The whole damage evaluation curve of the concrete-filled steel tube component under the action of the impact load reflects the impact kinetic energy E (namely the total energy consumption E) at a specific damage degreetotal) The relation with the mass m of the impact body, the horizontal asymptote of which is the integral energy consumption E of the steel tube concrete memberglobleThe overall energy consumption E corresponding to the overall damage degree class limit W ═ 0.5, W ═ 0, and W ═ 0.5 can be determinedgloble，W＝-0.5、Egloble，W＝0、Egloble，W＝0.5Is 3 known quantities, and thus consumes energy locally Elocal＝Etotal-EglobleAnd local lesion assessment model L ═ Elocal/EtotalThe total energy consumption E at the local damage degree level limit L of 0.05 and the local damage degree level limit L of 0.1 may be calculated, respectivelytotal，L＝0.05、Etotal，L＝0.1Thus, local lesion cut points may be determined on the global lesion assessment curve. Since there are 3 global damage assessment curves (W ═ 0.5, W ═ 0, W ═ 0.5) and 2 preset local damage assessment indices (L ═ 0.05, L ═ 0.1), there are 2 local damage cut points on each global damage assessment curve, so 6 local damage cut points can be determined.
For the concrete-filled steel tube member of the present embodiment, the 6 local damage boundary points are respectively:
P1＝(mW＝-0.5，L＝0.05,Etotal，W＝-0.5，L＝0.05)＝(107.4,8.4)
P2＝(mW＝-0.5，L＝0.1,Etotal，W＝-0.5，L＝0.1)＝(52.7,8.9)
P3＝(mW＝0，L＝0.05,Etotal，W＝0，L＝0.05)＝(116.5,16.3)
P4＝(mW＝0，L＝0.1,Etotal，W＝0，L＝0.1)＝(63.0,17.2)
P5＝(mW＝0.5，L＝0.05,Etotal，W＝0.5，L＝0.05)＝(131.1,23.4)
P6＝(mW＝0.5，L＝0.1,Etotal，W＝0.5，L＝0.1)＝(80.824.7)
as shown in fig. 3, 6 local lesion boundary points are plotted on the global lesion evaluation curve in the coordinate system, and points P having the same local lesion degree level are plotted1、P3、P5Connecting to obtain a local damage assessment curve corresponding to the condition that L is 0.05; in the same way, point P2、P4、P6The connection is the local injury assessment curve corresponding to the L-0.1.
(2) Integrated global and local damage joint assessment model
As shown in fig. 4, 3 overall damage assessment curves (W ═ 0.5, W ═ 0, and W ═ 0.5) and 2 local damage assessment curves (L ═ 0.05, and L ═ 0.1) are integrated in the same coordinate system, which is a combined overall and local damage assessment model, and the overall damage and the local damage of the steel pipe concrete member under the impact load are classified into 8 damage grades:
when W is equal to [ -1, -0.5), the steel tube concrete member is slightly damaged, which corresponds to a region I in figure 4;
when W belongs to [ -0.5,0) and L belongs to (0,0.05), the whole concrete-filled steel tube member has moderate damage and local slight damage, which corresponds to a region II in the graph 4;
when W belongs to-0.5, 0) and L belongs to 0.05,0.1), the whole and local parts of the concrete-filled steel tube member are damaged moderately, which corresponds to a region III in the graph 4;
when W belongs to the range of-0.5, 0) and L belongs to the range of 0.1,1), the whole concrete-filled steel tube member is subjected to medium damage and local serious damage, which corresponds to the area IV in the graph 4;
when W belongs to [0,0.5) and L belongs to (0,0.05), the whole concrete-filled steel tube member is seriously damaged, and the local part of the concrete-filled steel tube member is slightly damaged, which corresponds to a region V in the graph 4;
when W belongs to [0,0.5) and L belongs to [0.05,0.1), the whole concrete-filled steel tube member is seriously damaged, and the part of the concrete-filled steel tube member is moderately damaged, which corresponds to a region VI in the graph 4;
when W belongs to [0,0.5) and L belongs to [0.1,1), the whole and local parts of the concrete-filled steel tube member are seriously damaged, which corresponds to a region VII in a figure 4;
when W belongs to [0.5,1], the concrete filled steel tube member is damaged and fails, which corresponds to a region VIII in FIG. 4.
After the integral and local damage combined evaluation model is constructed, for any unknown accidental impact working condition, the mass m of the impact body and the impact kinetic energy E serve as known parameters, when the damage of the concrete-filled steel tube member is evaluated, the combined value of the mass m of the impact body and the impact kinetic energy E is loaded into the integral and local damage combined evaluation model, and the integral damage degree and the local damage degree of the concrete-filled steel tube member under the action of impact load can be quickly obtained according to the position relation of the combined value, an integral damage evaluation curve and a local damage evaluation curve.
Taking the concrete-filled steel tube member of the embodiment as an example, the error of the evaluation method which does not fully consider local damage in the comparative analysis and the method of the invention is as follows:
when the influence of local damage is not fully considered, the concrete-filled steel tube member is considered to consume impact kinetic energy mainly through the whole damage, the whole damage condition of the member can be obtained by adjusting the rigidity of the member impact area during software calculation, a damage evaluation curve is drawn in the same way and is shown in fig. 5, and the evaluation curve which does not fully consider the local damage and the damage evaluation curve established by the scheme are compared to find that an obvious error area exists.
For the same impact condition, compared with the scheme, the damage evaluation result is severe by adopting an evaluation method which does not fully consider local damage, for example, when the mass m of the impact body is 25kg and the impact kinetic energy E is 19kJ, the actual damage condition of the concrete-filled steel tube member can be obtained by adopting finite element software LS-DYNA as shown in fig. 6, if the evaluation method which does not fully consider local damage is adopted, the combined point of the mass m of the impact body being 25kg and the impact kinetic energy E being 19kJ is above the damage evaluation curve corresponding to W being 0, and the damage evaluation result is that the member is cracked;
according to the evaluation model of the scheme, the combined point of the mass m of the impact body being 25kg and the impact kinetic energy E being 19kJ is located below the damage evaluation curve corresponding to the mass W being 0, and the damage evaluation result shows that the member is not cracked but the local damage is serious; the figure 6 verifies that the evaluation result of the scheme is consistent with the actual damage condition of the concrete-filled steel tube member.
Similarly, as long as the impact condition belongs to the error area, the damage evaluation result of the concrete-filled steel tube member is severe by adopting the evaluation method which does not fully consider the local damage, and the damage evaluation result can accurately and comprehensively reflect the actual impact damage form of the concrete-filled steel tube member by considering the relation between the local damage and the overall damage.

Claims (6)

1. The construction method of the steel pipe concrete member overall and local damage joint evaluation model is characterized by comprising the following steps:
acquiring design parameters of the concrete-filled steel tube member and a plurality of groups of impact working conditions applied to the concrete-filled steel tube member;
calculating by adopting finite element simulation software according to the design parameters and the impact working conditions to obtain the integral deformation and the residual bearing capacity of the concrete-filled steel tube component under each group of impact working conditions;
calculating the overall damage evaluation index of the concrete-filled steel tube member by adopting an overall damage evaluation model in which the concrete-filled steel tube member is unified before and after cracking according to each group of overall deformation and residual bearing capacity;
selecting an impact working condition that the overall damage evaluation index is equal to the overall damage boundary point, and drawing an overall damage evaluation curve of the concrete-filled steel tube member by adopting all the impact working conditions corresponding to the same overall damage boundary point;
selecting the numerical value of the horizontal asymptote of each overall damage assessment curve as the overall energy consumption of the concrete-filled steel tube component under the action of the impact load, and taking any point on the overall damage assessment curve as the total energy consumption;
acquiring a preset local damage evaluation index, and calculating a local damage dividing point on each overall damage evaluation curve by combining a local damage evaluation model and a relational expression of overall energy consumption, total energy consumption and local energy consumption;
and connecting local damage dividing points corresponding to the same local damage evaluation index to serve as local damage evaluation curves, and forming a whole and local damage combined evaluation model by adopting a plurality of damage grades formed by the crossed whole damage evaluation curve and the local damage evaluation curve.
2. The method for constructing the integral and local damage joint evaluation model of the concrete filled steel tube member according to claim 1, wherein the calculation formula of the integral damage evaluation model unified before and after cracking is as follows:
Figure FDA0002892786790000011
wherein delta is the maximum deformation of the steel tube concrete member after encountering impact load; deltacraThe critical deformation of the steel tube concrete member when cracking occurs; r' is the residual bearing capacity of the steel pipe concrete member after encountering impact load; rcraIs critical when the steel pipe concrete member cracksResidual bearing capacity; w is the overall damage assessment index.
3. The method for constructing the whole and local damage joint evaluation model of the concrete filled steel tube member according to claim 1, wherein the calculation formula of the local damage evaluation model is as follows:
Figure FDA0002892786790000021
wherein, L is a local damage assessment index; etotalThe total energy consumption is; elocalLocal energy consumption is achieved;
the relation among the overall energy consumption, the total energy consumption and the local energy consumption is as follows: elocal＝Etotal-Egloble，EglobleThe energy consumption is integrated;
the local damage demarcation point is the local energy consumption of the overall damage assessment curve.
4. The method for constructing a concrete filled steel tube member overall and local damage joint assessment model according to any one of claims 1 to 3, wherein the overall damage boundary points include-0.5, 0 and 0.5; the preset local damage assessment indexes comprise 0.05 and 0.1;
the overall damage evaluation curve and the local damage evaluation curve in the same coordinate system divide the overall damage and the local damage of the concrete-filled steel tube component under the impact load action into 8 damage grades, which are respectively as follows:
when W is equal to [ -1, -0.5), the steel tube concrete member is slightly damaged;
when W belongs to [ -0.5,0) and L belongs to (0,0.05), the whole concrete-filled steel tube member has moderate damage and local slight damage;
when W belongs to the range of-0.5, 0) and L belongs to the range of 0.05,0.1), the whole and the part of the steel pipe concrete member are damaged moderately;
when W belongs to the range of-0.5, 0) and L belongs to the range of 0.1,1), the whole concrete-filled steel tube member is damaged moderately and seriously damaged locally;
when W belongs to [0,0.5) and L belongs to (0,0.05), the whole concrete-filled steel tube member is seriously damaged, and the local part of the concrete-filled steel tube member is slightly damaged;
when W belongs to [0,0.5) and L belongs to [0.05,0.1), the whole concrete-filled steel tube member is seriously damaged, and medium damage is locally generated;
when W belongs to [0,0.5) and L belongs to [0.1,1), the whole and local parts of the steel pipe concrete member are seriously damaged;
when W is equal to 0.5,1, the steel pipe concrete member is damaged and failed.
5. The construction method of the concrete filled steel tube member overall and local damage joint evaluation model according to claim 4, wherein the impact working condition comprises impact body mass and impact kinetic energy; and when the overall damage evaluation curve is drawn, the mass of the impact body is taken as an abscissa, and the impact kinetic energy is taken as an ordinate.
6. Use of a global and local lesion joint assessment model constructed according to the method of any of claims 1 to 5, comprising:
acquiring an impact working condition loaded on a concrete-filled steel tube member with the same design parameters as those of a constructed integral and local damage joint evaluation model;
and determining the overall damage degree and the local damage degree of the concrete-filled steel tube member under the impact working condition according to the impact working condition and the position relation of the overall and local damage joint evaluation model.
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