CN106548009B - Method and device for evaluating power impact effect of goaf power transmission tower - Google Patents
Method and device for evaluating power impact effect of goaf power transmission tower Download PDFInfo
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Abstract
The invention provides a method and a device for evaluating a power impact effect of a transmission tower in a goaf. Wherein the method comprises the following steps: establishing a finite element model of the power transmission tower, and enabling the power transmission tower foundation to be in different preset deformation states; carrying out wind vibration response test on the power transmission tower to determine the damping ratio of the power transmission tower; setting a plurality of wind loads, and respectively calculating the dynamic impact coefficients of the power transmission tower under different deformation states and different wind loads of the power transmission tower foundation; and comparing the maximum value of the calculated power impact coefficients with a preset power impact coefficient, and if the maximum value of the power impact coefficient is greater than or equal to the preset power impact coefficient, indicating that the safety requirement of the power transmission line cannot be met by changing the structure of the power transmission tower. According to the evaluation method for the dynamic impact effect of the transmission tower in the goaf, the influence of the ground surface deformation impact effect of the goaf on the bearing performance of the transmission tower structure is taken into consideration, so that the bearing capacity of the transmission tower structure is accurately evaluated.
Description
Technical Field
The invention relates to the technical field of evaluation of health states of transmission towers, in particular to a method and a device for evaluating a power impact effect of a transmission tower in a goaf.
Background
The power transmission tower located in the coal mine goaf is influenced by the ground surface subsidence of the coal mine goaf, the foundation of the power transmission tower deforms, such as uneven settlement, inclination and horizontal slippage, further the root opening and the height difference of tower legs of the power transmission tower change, and a tower body structure generates large additional stress, so that the local damage or the overall collapse of the tower body is caused, and the safety of the power transmission tower and the stable operation of a power transmission line are directly threatened.
The ground surface sedimentation of the goaf has two forms of slow sedimentation and sudden sedimentation. For the slow settlement condition, the impact effect is not obvious, and the foundation deformation can be applied to the tower foot of the power transmission tower in a pseudo-static load step mode. For the situation that the surface subsidence caused by the fact that the power transmission line passes through a goaf with a small mining thickness ratio, for example, the goaf with the mining thickness ratio smaller than 40, changes at an initial stage strongly, sudden and large-scale settlement can cause the power transmission tower foundation to deform violently in a short time, a power impact effect can be generated on the power transmission tower structure, and further the bearing capacity of the power transmission tower structure is influenced. The existing goaf foundation deformation power transmission tower bearing capacity evaluation and analysis method does not consider the influence of goaf ground surface deformation impact effect on the bearing performance of a power transmission tower structure, so that the real stress condition of the power transmission tower structure in the power transmission tower foundation deformation process at the initial stage of ground surface collapse caused by the goaf cannot be reflected, and further the potential safety hazard exists in the power transmission tower.
Disclosure of Invention
In view of the above, the invention provides a method and a device for evaluating a dynamic impact effect of a goaf power transmission tower, and aims to solve the problem of great potential safety hazard caused by the fact that the influence of the dynamic impact effect on the bearing capacity performance of the power transmission tower is not considered in the existing method for evaluating and analyzing the bearing capacity of the goaf power transmission tower in the basic deformation process.
In one aspect, the invention provides a method for evaluating a power impact effect of a transmission tower in a goaf, which comprises the following steps: a base deformation simulation step, namely establishing a finite element model of the power transmission tower and enabling the power transmission tower base to be in different preset deformation states; determining dynamic impact coefficients, namely setting a plurality of wind loads, and respectively calculating the dynamic impact coefficients of the power transmission tower under different deformation states and different wind loads of the power transmission tower foundation; and a power impact effect evaluation step, namely comparing the maximum value of the calculated power impact coefficients with a preset power impact coefficient, and if the maximum value of the power impact coefficient is greater than or equal to the preset power impact coefficient, indicating that the safety requirement of the power transmission line cannot be met by changing the structure of the power transmission tower.
Further, in the evaluation method for the dynamic impact effect of the goaf transmission tower, the basic deformation simulation step further includes: the preset deformation state of the power transmission tower foundation comprises the following steps: one or more of a settling deformation state, an inclined deformation state, and a horizontal slip deformation state.
Further, in the evaluation method for the power impact effect of the goaf transmission tower, the step of determining the power impact coefficient further includes: a static axial force determining substep, namely calculating the static axial force F of each rod piece of the power transmission tower foundation in various preset deformation states and various wind loadss(ii) a A damping ratio determining substep, which is used for carrying out wind vibration response test on the power transmission tower so as to determine the damping ratio of the power transmission tower; a dynamic axial force determining substep, namely calculating the dynamic axial force peak value F of each rod piece of the power transmission tower foundation in various preset deformation states and various wind loads according to the damping ratio of the power transmission towerd-peak(ii) a A dynamic impact coefficient determining sub-step of determining corresponding FsAnd Fd-peakThe ratio of (a) to (b) is determined as the coefficient of dynamic impact of the transmission tower.
Further, in the above evaluation method for the dynamic impact effect of the goaf transmission tower, the damping ratio determining sub-step further includes: an acceleration sensor mounting sub-step of arranging a plurality of acceleration sensors on a plurality of rods of the power transmission tower in a one-to-one correspondence along a height direction of the power transmission tower; an acceleration obtaining sub-step, namely performing wind vibration response test on the power transmission tower, and obtaining the acceleration of each rod piece through each acceleration sensor; and a damping ratio determining substep of determining a damping ratio of the transmission tower based on the acceleration of the poles of each transmission tower.
Further, in the evaluation method for the power impact effect of the goaf power transmission tower, if the maximum value of the power impact coefficient is smaller than the preset power impact coefficient value, it indicates that the power transmission line safety can be satisfied by changing the structure of the power transmission tower.
According to the invention, the influence of the goaf surface deformation impact effect on the bearing performance of the power transmission tower structure is taken into consideration, and the goaf power transmission tower dynamic impact effect in the power transmission tower basic deformation process is evaluated, so that the accurate evaluation of the bearing capacity of the power transmission tower structure in the basic deformation process at the initial stage of surface subsidence caused by the goaf is realized, the method has better applicability and higher precision, technical reference and basis are provided for the fine design of the goaf power transmission tower structure, and the safety performance of the power transmission tower is greatly improved.
In another aspect, the invention further provides an evaluation device for the dynamic impact effect of the transmission tower in the goaf, which comprises: the base deformation simulation module is used for establishing a finite element model of the power transmission tower and enabling the power transmission tower base to be in different preset deformation states; the power impact coefficient determining module is used for setting a plurality of wind loads and respectively calculating the power impact coefficients of the power transmission tower under different deformation states and different wind loads of the power transmission tower foundation; and the power impact effect evaluation module is used for comparing the maximum value of the calculated power impact coefficients with a preset power impact coefficient, and if the maximum value of the power impact coefficient is greater than or equal to the preset power impact coefficient, the power impact effect evaluation module indicates that the safety requirement of the power transmission line cannot be met by changing the structure of the power transmission tower.
Further, in the evaluation device for the power impact effect of the goaf power transmission tower, in the basic deformation simulation module: the preset deformation state of the power transmission tower foundation comprises the following steps: one or more of a settling deformation state, an inclined deformation state, and a horizontal slip deformation state.
Further, in the above evaluation apparatus for the dynamic impact effect of the goaf transmission tower, the dynamic impact coefficient determination module further includes: a static axial force determination submodule for calculating static axial forces F of the rods of the power transmission tower foundation in various preset deformation states and under various wind loadss(ii) a The damping ratio determination submodule is used for carrying out wind vibration response test on the power transmission tower so as to determine the damping ratio of the power transmission tower; the dynamic axial force determination submodule is used for calculating the movement of each rod piece of the power transmission tower foundation in various preset deformation states and under various wind loads according to the damping ratio of the power transmission towerPeak value of dynamic axial force Fd-peak(ii) a A power impact coefficient determination submodule for comparing the corresponding FsAnd Fd-peakThe ratio of (a) to (b) is determined as the coefficient of dynamic impact of the transmission tower.
Further, in the above evaluation apparatus for the goaf transmission tower dynamic impact effect, the damping ratio determination submodule further includes: the acceleration sensor mounting submodule is used for correspondingly arranging a plurality of acceleration sensors on a plurality of rod pieces of the power transmission tower one by one along the height direction of the power transmission tower; the acceleration acquisition submodule is used for carrying out wind vibration response test on the power transmission tower and acquiring the acceleration of each rod piece through each acceleration sensor; and the damping ratio determining submodule is used for determining the damping ratio of the transmission tower according to the acceleration of the rod piece of each transmission tower.
Further, in the above evaluation apparatus for the dynamic impact effect of the goaf power transmission tower, the dynamic impact effect evaluation module is further configured to: if the maximum value of the dynamic impact coefficient is smaller than the preset dynamic impact coefficient value, the safety of the power transmission line can be met by changing the structure of the power transmission tower.
According to the invention, the influence of the goaf surface deformation impact effect on the bearing performance of the power transmission tower structure is taken into consideration, and the goaf power transmission tower dynamic impact effect in the power transmission tower basic deformation process is evaluated, so that the accurate evaluation of the bearing capacity of the power transmission tower structure in the basic deformation process at the initial stage of surface subsidence caused by the goaf is realized, the method has better applicability and higher precision, technical reference and basis are provided for the fine design of the goaf power transmission tower structure, and the safety performance of the power transmission tower is greatly improved.
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Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a flowchart of a method for evaluating a goaf power transmission tower dynamic impact effect according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a finite element model and a spatial coordinate system of a power transmission tower according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a dynamic axial force time course curve of a main material of a power transmission tower body according to an embodiment of the present invention;
fig. 4 is a block diagram illustrating an apparatus for evaluating a goaf power transmission tower dynamic impact effect according to an embodiment of the present invention;
fig. 5 is a block diagram illustrating a structure of a dynamic impact coefficient determining module in the evaluation apparatus for power impact effect of the goaf power transmission tower according to the embodiment of the present invention;
fig. 6 is a block diagram of a damping ratio determining submodule in the goaf transmission tower power impact effect evaluation apparatus according to the embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The method comprises the following steps:
referring to fig. 1, fig. 1 is a flowchart of a method for evaluating a goaf transmission tower dynamic impact effect according to an embodiment of the present invention. As shown, the method comprises the following steps:
and a foundation deformation simulation step S1, establishing a finite element model of the transmission tower, and enabling the transmission tower foundation to be in different preset deformation states.
specifically, first, a finite element model of the transmission tower is established, which is well known to those skilled in the art and therefore not described in detail, and then, referring to fig. 2, a preset deformation state of the transmission tower foundation is simulated by reasonable constraints on the tower foot of the transmission tower, wherein the preset deformation state of the transmission tower foundation may include one or more of a settlement deformation state, an inclination deformation state and a horizontal slip deformation state, and different basic deformation state constraints are shown in table 1:
TABLE 1
| Type of basic deformation | Constraint conditions |
| Sedimentation | UZ is released at the subsidence and fixed at the non-subsidence |
| Tilting | Releasing UZ and ROTY at an incline and releasing ROTY at a non-incline |
| Horizontal slip | UX is released at the sliding position and is fixedly connected at the non-sliding position |
In table 1, UZ and UX are translational degrees of freedom in the vertical direction and the horizontal line direction of the power transmission tower, and routy is rotational degree of freedom in the line direction around the power transmission tower. Referring to fig. 2, the X-axis is the transverse line direction of the transmission tower, the Y-axis is the forward line direction of the transmission tower, and the Z-axis is the vertical direction of the transmission tower. It should be noted that, in the specific implementation, the specific implementation manner of the constraint method is well known to those skilled in the art, and therefore, the detailed description is omitted.
And a dynamic impact coefficient determining step S2, setting a plurality of wind loads, and respectively calculating the dynamic impact coefficients of the transmission tower under different deformation states and different wind loads of the transmission tower foundation.
Specifically, the set wind loads can be 90-degree strong wind and 60-degree strong wind respectively, so that the foundation of the power transmission tower is in a settlement deformation state, an inclination deformation state and a horizontal slip deformation state respectively, the 90-degree strong wind and the 60-degree strong wind are combined with the settlement deformation state, the inclination deformation state and the horizontal slip deformation state respectively to form multiple working conditions, and the dynamic impact coefficients of the power transmission tower under the various working conditions are determined respectively.
And a dynamic impact effect evaluation step S3, comparing the maximum value of the calculated dynamic impact coefficients with a preset dynamic impact coefficient, and if the maximum value of the dynamic impact coefficient is greater than or equal to the preset dynamic impact coefficient, indicating that the safety requirement of the power transmission line cannot be met by changing the structure of the power transmission tower. And if the maximum value of the dynamic impact coefficient is smaller than the preset dynamic impact coefficient value, the safety of the power transmission line can be met by changing the structure of the power transmission tower.
Specifically, a plurality of power impact coefficients can be obtained through the steps, the maximum value of the power impact coefficients is selected and compared with the preset power impact coefficient, if the maximum value of the power impact coefficient is larger than or equal to the preset power impact coefficient, the situation that the safety requirement of the power transmission line cannot be met by changing the structure of the power transmission tower is indicated, and a power failure and line transformation treatment plan should be made in advance for the established line. It should be noted that, in specific implementation, the preset dynamic impact coefficient may be determined according to an actual situation, and this embodiment does not limit the preset dynamic impact coefficient.
In the embodiment, the dynamic impact effect of the goaf power transmission tower in the basic deformation process is calculated according to the measured value of the damping ratio of the power transmission tower structure based on the wind environment excitation, the influence of the goaf surface deformation impact effect on the bearing performance of the power transmission tower structure is taken into consideration, and the accurate evaluation of the bearing capacity of the power transmission tower structure in the basic deformation process at the initial stage of surface subsidence caused by the goaf is realized through the evaluation of the goaf power transmission tower dynamic impact effect in the basic deformation process of the power transmission tower, so that the safety performance of the power transmission tower is greatly improved.
In an embodiment of the present invention, the dynamic impact coefficient determining step S2 may further include:
static axial force determination substep S21, calculationStatic axial force F of each rod piece of power transmission tower foundation in various preset deformation states and under various wind loadss。
Specifically, the stress of the power transmission tower structure under the combined working conditions of each preset deformation state and each wind load of the power transmission tower foundation is analyzed and calculated by adopting a static method, and the static axial force F of each typical rod piece is extractedsthe bearing capacity ② of the main material ② of the power transmission tower leg, the main material ② of the power transmission tower body, the inclined material ② of the power transmission tower leg and the inclined material ② of the power transmission tower body is greatly influenced by the deformation ② of the foundation, so that the positions ② of the main material ② of the power transmission tower leg, the main material ② of the power transmission tower body, the inclined material ② of the power transmission tower leg and the inclined material ② of the power transmission tower body can be respectively selected for each typical rod piece, and the positions ② of the main material ② of the power transmission tower leg, the main material ② of the power transmission tower body, the inclined material ② of the power transmission tower leg and the inclined material ② of the power transmission tower body are shown in a figure 2.
The damping ratio determining sub-step S22 performs a wind vibration response test on the transmission tower to determine the damping ratio of the transmission tower.
Specifically, a wind vibration response test is performed on the power transmission tower, and the acceleration of each rod piece of the power transmission tower is measured. And then identifying the damping ratio of the power transmission tower structure by adopting a random subspace method. It should be noted that the random subspace method is well known to those skilled in the art, and therefore will not be described in detail.
A dynamic axial force determining substep S23, calculating dynamic axial force peak values F of the rods of the transmission tower foundation under various preset deformation states and various wind loads according to the damping ratio of the transmission towerd-peak。
Specifically, a time-course curve of the dynamic axial force of a power transmission tower rod piece under each preset deformation state and each wind load combination working condition of a power transmission tower foundation is drawn by adopting a nonlinear transient power method and according to the structural damping ratio analysis of the power transmission tower, and each typical dynamic axial force peak value F is extractedd-peak. It should be noted that the nonlinear transient power method is well known to those skilled in the art and therefore will not be described in detail.
The dynamic impact coefficient determining substep S24 assigns F to the correspondingsAnd Fd-peakThe ratio of (a) to (b) is determined as the coefficient of dynamic impact of the transmission tower.
Concretely, F corresponding to various working conditionssAnd Fd-peakThe ratio of (a) to (b) is determined as the coefficient of dynamic impact of the transmission tower.
In this example, FsAnd Fd-peakThe ratio of the power impact coefficient to the power impact coefficient of the power transmission tower is determined, the power impact coefficient of the power transmission tower is calculated more accurately, and the accuracy of power impact effect evaluation is further ensured.
In one embodiment of the present invention, the damping ratio determining substep S22 may further comprise:
the acceleration sensor mounting sub-step S221 of arranging a plurality of acceleration sensors on a plurality of poles of the transmission tower in a one-to-one correspondence along the height direction of the transmission tower.
Specifically, acceleration test points are selected on a plurality of rods in the height direction of the transmission tower, and a high-sensitivity acceleration sensor is mounted at each test point.
And an acceleration obtaining substep S222, performing a wind vibration response test on the power transmission tower, and obtaining the acceleration of each rod piece through each acceleration sensor.
Specifically, a wind vibration response test is carried out on the power transmission tower, and acceleration time-course curves of all rod pieces of the power transmission tower under the excitation of a wind environment are collected through all acceleration sensors.
The damping ratio determining substep S223 determines the damping ratio of the transmission tower according to the acceleration of the poles of each transmission tower.
Specifically, the damping ratio of the transmission tower is identified according to the acceleration of each rod piece by adopting a random subspace method.
In the embodiment, the acceleration of each rod piece of the power transmission tower is measured under the excitation of an actual wind environment, and the damping ratio of the power transmission tower is identified by using a random subspace method, so that the identified damping ratio is closer to the actual damping ratio, and the accuracy of the evaluation of the dynamic impact effect is further ensured.
In one embodiment of the present invention, the dynamic impact effect evaluation step S3 may further include:
and if the maximum value of the dynamic impact coefficient is smaller than the preset dynamic impact coefficient value, the safety of the power transmission line can be met by changing the structure of the power transmission tower.
Specifically, if the maximum value of the dynamic impact coefficient is smaller than the preset dynamic impact coefficient value, it is indicated that the safety of the power transmission line can be met by changing the structure of the power transmission tower, that is, the safety requirement of the power transmission line can be met by improving the bearing capacity of the structure of the power transmission tower and adopting a large-plate foundation or reinforcement transformation. It should be noted that, in specific implementation, the preset dynamic impact coefficient may be determined according to an actual situation, and this embodiment does not limit the preset dynamic impact coefficient.
The above method will be further illustrated by the following examples:
taking a 220kV single-loop cat-head type power transmission tower as an example, the power transmission tower is called to be 30m high, the maximum value of the average wind speed at 10m high in each 10min time period is 27m/s, and the combination of basic horizontal slippage, 90-degree heavy wind load and 60-degree heavy wind load is considered during analysis.
firstly, a finite element model of the power transmission tower shown in fig. 2 is established, the degree of freedom UX of the tower foot ⑤ shown in fig. 2 is released, and the rest 3 tower feet adopt a fixed connection constraint mode.
Secondly, arranging 6 high-sensitivity acceleration sensors on the plurality of rods along the height direction of the goaf power transmission tower, collecting acceleration time-course curves of the rods under the excitation of a wind environment, identifying the damping ratio of the 220kV cat-head power transmission tower structure in the goaf by adopting a random subspace method, and determining the damping ratio value of the power transmission tower structure to be 0.015 according to the identification result of the actually measured data.
Then, a tower foot constraint form for establishing a power transmission tower finite element model and three types of foundation deformation is adopted, the stress of the power transmission tower structure under the combined working condition of wind load and foundation horizontal slip deformation is analyzed and designed by a static method, and the static axial force F of a typical rod piece is extracteds. According to the damping ratio value of the 220kV cat-head type power transmission tower of 0.015, analyzing and designing a dynamic axial force time-course curve of each rod piece of the power transmission tower under the combined working condition of wind load and basic horizontal slip deformation by adopting a nonlinear transient power method, and extracting a typical rod piece internal force peak value Fd-peak. The dynamic axial force time course curve of the tower body main material can be seen in fig. 3, wherein, the abscissa represents time,the ordinate represents the dynamic axial force of the tower body main material. The static and dynamic axial force peaks for each exemplary bar are shown in table 2:
TABLE 2
Dynamic impact coefficient a of typical rod piece of power transmission tower structureiThe calculated values are shown in table 3:
TABLE 3
Finally, the preset dynamic impact coefficient is 1.50. The coefficient of dynamic impact a of each typical pole of the transmission tower structure obtained in table 3iAnd selecting the maximum value of the dynamic impact coefficient of 2.10, wherein the maximum value of the dynamic impact coefficient of 2.10 is greater than the preset dynamic impact coefficient of 1.50, judging that the impact effect of the power transmission tower structure is obvious, and only improving the bearing capacity of the tower structure and adopting a large plate foundation or reinforcing and modifying can not meet the safety requirement of a power transmission line, and a power failure and line modification treatment plan should be made in advance for the established line. In other basic deformation states, the evaluation can be performed according to the above steps.
In summary, in the embodiment, by taking the influence of the goaf ground surface deformation impact effect on the bearing performance of the power transmission tower structure into consideration and evaluating the goaf power transmission tower dynamic impact effect in the power transmission tower basic deformation process, the accurate evaluation of the bearing capacity of the power transmission tower structure in the process of ground surface collapse initial basic deformation caused by the goaf is realized, technical reference and basis are provided for the fine design of the goaf power transmission tower structure, and the safety performance of the power transmission tower is greatly improved.
The embodiment of the device is as follows:
referring to fig. 4, fig. 4 is a block diagram illustrating an apparatus for evaluating a goaf transmission tower dynamic impact effect according to an embodiment of the present invention. As shown, the apparatus comprises: the dynamic impact simulation system comprises a basic deformation simulation module 100, a dynamic impact coefficient determination module 200 and a dynamic impact effect evaluation module 300. The base deformation simulation module 100 is configured to establish a finite element model of the power transmission tower, and enable the power transmission tower base to be in different preset deformation states, where the preset deformation states may include: one or more of a settling deformation state, an inclined deformation state, and a horizontal slip deformation state. The dynamic impact coefficient determination module 200 is configured to set a plurality of wind loads, and respectively calculate the dynamic impact coefficients of the power transmission tower under different deformation states and different wind loads of the power transmission tower foundation. The power impact effect evaluation module 300 is configured to compare the maximum value of the calculated power impact coefficients with a preset power impact coefficient, and if the maximum value of the power impact coefficient is greater than or equal to the preset power impact coefficient, it indicates that the power transmission tower structure cannot meet the safety requirement of the power transmission line by changing, that is, the power transmission tower structure bearing capacity is improved, and the power transmission tower structure cannot meet the safety requirement of the power transmission line by adopting a large-plate foundation or reinforcement transformation, so that a power failure and line transformation processing plan should be made in advance for the established line. The specific implementation process of the apparatus may refer to the description in the above method embodiments, and the description of the embodiment is omitted here for brevity.
In the embodiment, the influence of the goaf ground surface deformation impact effect on the bearing performance of the power transmission tower structure is taken into consideration, and the goaf power transmission tower dynamic impact effect in the power transmission tower basic deformation process is evaluated, so that the accurate evaluation of the bearing capacity of the power transmission tower structure in the primary basic deformation process of ground surface collapse caused by the goaf is realized, the goaf power transmission tower structure has better applicability and higher precision, technical reference and basis are provided for the fine design of the goaf power transmission tower structure, and the safety performance of the power transmission tower is greatly improved.
In the embodiment, the acceleration sensor is adopted to measure the acceleration of the rod piece of the power transmission tower in real time, and the damping ratio of the power transmission tower is determined through the real-time acceleration, so that the determined damping ratio of the power transmission tower is closer to an actual value, and the accuracy of power impact effect evaluation is further ensured.
Referring to fig. 5, in the above embodiment, the dynamic impact coefficient determination module 200 may include: static shaft force determination submodule 210, damping ratio determination submodule 220, dynamic shaft force determination submodule 230, and dynamic impact coefficient determination submodule 240. It is composed ofIn the above, the static axial force determination submodule 210 is used for calculating the static axial force F of each rod piece of the power transmission tower foundation in various preset deformation states and under various wind loadss. The damping ratio determination submodule 220 is configured to perform a wind vibration response test on the transmission tower to determine the damping ratio of the transmission tower. The dynamic axial force determination submodule 230 is used for calculating the dynamic axial force peak value F of each rod piece of the power transmission tower foundation in various preset deformation states and under various wind loads according to the damping ratio of the power transmission towerd-peak. The kinetic impact coefficient determination submodule 240 is used for assigning the corresponding FsAnd Fd-peakThe ratio of (a) to (b) is determined as the coefficient of dynamic impact of the transmission tower. The specific implementation process of the dynamic impact coefficient determining module in the device may refer to the description in the above method embodiments, and the description of the embodiment is omitted here.
In this example, FsAnd Fd-peakThe ratio of the power impact coefficient to the power impact coefficient of the power transmission tower is determined, the power impact coefficient of the power transmission tower is calculated more accurately, and the accuracy of power impact effect evaluation is further ensured.
Referring to fig. 6, the damping ratio determination sub-module 220 in the above embodiment may include: an acceleration sensor mounting submodule 221, an acceleration acquisition submodule 222, and a damping ratio determination submodule 223. The acceleration sensor mounting submodule 221 is configured to arrange a plurality of acceleration sensors on a plurality of rods of the power transmission tower in a one-to-one correspondence along the height direction of the power transmission tower. The acceleration obtaining submodule 222 is configured to perform a wind vibration response test on the power transmission tower, and obtain the acceleration of each rod through each acceleration sensor. The damping ratio determination submodule 223 is used to determine the damping ratio of the transmission towers based on the acceleration of the poles of each transmission tower. The specific implementation process of the damping ratio determining submodule in the device may refer to the description in the above method embodiment, and the description of the embodiment is not repeated herein.
In the embodiment, the acceleration of each rod piece of the power transmission tower is measured under the excitation of an actual wind environment, and the damping ratio of the power transmission tower is identified by using a random subspace method, so that the identified damping ratio is closer to the actual damping ratio, and the accuracy of the evaluation of the dynamic impact effect is further ensured.
In the above embodiment, the dynamic impact effect evaluation module 300 is further configured to: if the maximum value of the dynamic impact coefficient is smaller than the preset dynamic impact coefficient value, the safety of the power transmission line can be met by changing the structure of the power transmission tower, namely, the safety requirement of the power transmission line can be met by improving the bearing capacity of the structure of the power transmission tower and adopting a large plate foundation or reinforcing and transforming. It should be noted that, in the specific implementation, the specific preset dynamic impact coefficient may be determined according to the actual situation, and this embodiment does not limit the specific preset dynamic impact coefficient.
In summary, in the embodiment, by taking the influence of the goaf ground surface deformation impact effect on the bearing performance of the power transmission tower structure into consideration and evaluating the goaf power transmission tower dynamic impact effect in the power transmission tower basic deformation process, the accurate evaluation of the bearing capacity of the power transmission tower structure in the basic deformation process at the initial stage of ground surface collapse caused by the goaf is realized, the method has better applicability and higher precision, technical reference and basis are provided for the fine design of the goaf power transmission tower structure, and the safety performance of the power transmission tower is greatly improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. A method for evaluating the dynamic impact effect of a transmission tower in a goaf is characterized by comprising the following steps:
a base deformation simulation step, namely establishing a finite element model of the power transmission tower, and enabling the power transmission tower base to be in different preset deformation states;
determining a dynamic impact coefficient, namely setting a plurality of wind loads which are respectively 90-degree strong wind and 60-degree strong wind, and forming a plurality of working conditions of different wind directions and different preset deformation state combinations; calculating static axial force Fs of each rod piece of the power transmission tower foundation in various preset deformation states and under various wind loads, and arranging a plurality of acceleration sensors on the plurality of rod pieces of the power transmission tower in a one-to-one correspondence manner along the height direction of the power transmission tower; an acceleration obtaining sub-step, wherein wind vibration response test is carried out on the power transmission tower, and the acceleration of each rod piece is obtained through each acceleration sensor; a damping ratio determining substep of identifying the damping ratio of the transmission towers by a random subspace method according to the acceleration of the rod members of the transmission towers; calculating the dynamic axial force peak value Fd-peak of each rod piece of the power transmission tower foundation in various preset deformation states and under various wind loads according to the damping ratio of the power transmission tower; determining the ratio of the corresponding Fs to the Fd-peak as the dynamic impact coefficient of the power transmission tower;
and a dynamic impact effect evaluation step, comparing the maximum value of the calculated dynamic impact coefficients with a preset dynamic impact coefficient, and if the maximum value of the dynamic impact coefficients is greater than or equal to the preset dynamic impact coefficient, the safety requirement of the power transmission line cannot be met by changing the structure of the power transmission tower.
2. The method of estimating goaf power tower dynamic impact effect as claimed in claim 1, wherein the predetermined deformation state of the power tower base comprises: one or more of a settling deformation state, an inclined deformation state, and a horizontal slip deformation state.
3. The method of estimating goaf power tower dynamic impact according to claim 1, wherein the dynamic impact estimation step further comprises:
and if the maximum value of the dynamic impact coefficient is smaller than the preset dynamic impact coefficient value, the safety of the power transmission line can be met by changing the structure of the power transmission tower.
4. An assessment device for power shock effect of a goaf power transmission tower is characterized by comprising:
a base deformation simulation module (100) for establishing a finite element model of the transmission tower and making the transmission tower base in different preset deformation states;
the dynamic impact coefficient determining module (200) is used for setting a plurality of wind loads which are respectively the wind loads of 90-degree strong wind and 60-degree strong wind, and forming a plurality of working conditions of different wind directions and different preset deformation state combinations; calculating static axial force Fs of each rod piece of the power transmission tower foundation in various preset deformation states and under various wind loads, and arranging a plurality of acceleration sensors on the plurality of rod pieces of the power transmission tower in a one-to-one correspondence manner along the height direction of the power transmission tower; an acceleration obtaining sub-step, wherein wind vibration response test is carried out on the power transmission tower, and the acceleration of each rod piece is obtained through each acceleration sensor; a damping ratio determining substep of identifying the damping ratio of the transmission towers by a random subspace method according to the acceleration of the rod members of the transmission towers; calculating the dynamic axial force peak value Fd-peak of each rod piece of the power transmission tower foundation in various preset deformation states and under various wind loads according to the damping ratio of the power transmission tower; determining the ratio of the corresponding Fs to the Fd-peak as the dynamic impact coefficient of the power transmission tower;
and the dynamic impact effect evaluation module (300) is used for comparing the maximum value of the calculated dynamic impact coefficients with a preset dynamic impact coefficient, and if the maximum value of the dynamic impact coefficients is greater than or equal to the preset dynamic impact coefficient, the power transmission tower structure cannot meet the safety requirement of the power transmission line.
5. The goaf power tower dynamic impact effect evaluation device of claim 4, wherein the preset deformation states in the base deformation simulation module (100) comprise: one or more of a settling deformation state, an inclined deformation state, and a horizontal slip deformation state.
6. The goaf power tower dynamic shock effect evaluation apparatus of claim 4, wherein the dynamic shock effect evaluation module (300) further comprises:
and if the maximum value of the dynamic impact coefficient is smaller than the preset dynamic impact coefficient value, the power transmission tower structure is changed to meet the requirement of the safety of the power transmission line.
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| CN113312818A (en) * | 2021-05-31 | 2021-08-27 | 国网山西省电力公司电力科学研究院 | Goaf transmission tower safety evaluation method |
| CN113358313A (en) * | 2021-06-08 | 2021-09-07 | 国网河南省电力公司电力科学研究院 | Method for testing looseness of bolts of power transmission iron tower |
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