CN112632834B - Failure evaluation method and device for bolt in earthquake - Google Patents
Failure evaluation method and device for bolt in earthquake Download PDFInfo
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Abstract
The invention provides a failure evaluation method and a device for a bolt in an earthquake, wherein the method comprises the following steps: performing longitudinal seismic simulation to obtain the maximum axial response displacement U of the bolt; acquiring an equivalent external force at the bolt position meeting the maximum axial response displacement U; acquiring bolt pretightening force f0, applying pretightening force f0 to the bolt and analyzing the pretightening force of the bolt; applying an equivalent external force to the bolt to obtain the residual pretightening force f1 of the bolt; calculating the static friction force f2 between the bolt and the connected piece under the action of f1 according to f 1; performing transverse earthquake simulation to obtain the maximum acceleration a of the connected piece relative to the radial direction of the bolt; calculating the maximum vibration force F of the connected piece under the condition of the maximum acceleration a; the bolt failure evaluation was performed according to F2 and F. The method considers the coupling effect of the pretightening force and the earthquake, has high accuracy of an evaluation result, can research the change of the bolt in the earthquake process by a simulation means, and can well guide the improvement design of a product.
Description
Technical Field
The invention relates to the technical field of finite element simulation analysis, in particular to a failure evaluation method and a failure evaluation device for a bolt in an earthquake.
Background
The bolt is used as a common fastener in various mechanical products. In earthquakes, axial yielding and radial loosening of bolts are the primary failure modes of bolts. In this regard, conventional bolt failure evaluation methods rely primarily on testing a prototype on a vibration test stand. However, the test evaluation has the problems of high cost, long period and the like, only one judgment result can be obtained, the research on the process and the rule is lack of support, and the guidance on the improvement design of the product is poor.
Computer simulation analysis is playing an important role in the product design process, however, the currently common vibration simulation analysis (for example, seismic simulation analysis) method mainly adopts a modal superposition method, belongs to linear analysis, and cannot consider the non-linear problems such as contact state and the like. The vibration analysis of the bolt must take into account the contact effect with the connected piece under the action of the pretension. Therefore, how to perform bolt vibration analysis under the pre-tightening force consideration becomes a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to solve the technical problems, and a first object of the invention is to provide a failure evaluation method for a bolt in an earthquake, which considers the coupling effect of pretightening force and the earthquake, carries out linear superposition analysis on equivalent external force and the pretightening force of the bolt, can evaluate the residual pretightening force of the bolt in the earthquake process, thereby judging whether the bolt fails, has high accuracy of evaluation results, and can well guide the improved design of products by researching the change of the bolt in the earthquake process through a simulation means.
A second object of the present invention is to provide a device for evaluating the failure of a bolt in an earthquake.
The technical scheme adopted by the invention is as follows:
in order to achieve the above object, a first aspect of the present invention provides a method for evaluating failure of a bolt in an earthquake, including the following steps: performing longitudinal seismic simulation to obtain the maximum axial response displacement U at the bolt; performing statics simulation to obtain an equivalent external force at the bolt meeting the maximum axial response displacement U; acquiring bolt pretightening force f0, applying the pretightening force f0 to the bolt, and performing bolt pretightening force analysis; applying the equivalent external force to the bolt, and performing the static simulation analysis to obtain the residual pretightening force f1 of the bolt; calculating a static friction force f2 between the bolt and the connected piece under the action of the residual pretightening force f1 according to the residual pretightening force f 1; performing transverse seismic simulation to obtain the maximum acceleration a of the connected piece relative to the radial direction of the bolt; calculating the maximum vibration force F of the connected piece under the condition of the maximum acceleration a; and performing failure evaluation of the bolt according to the static friction force F2 and the maximum vibration force F.
According to one embodiment of the invention, the static friction force f2 between the bolt and the connected piece under the action of the residual pretightening force f1 is calculated according to the following formula (1):
f2＝f1×μ (1)；
wherein f1 is the residual pretightening force, f2 is the static friction force between the bolt and the connected piece under the action of the residual pretightening force f1, and mu is the friction coefficient of the contact area between the bolt and the connected piece.
According to one embodiment of the present invention, the maximum vibration force F of the attached member under the condition of the maximum acceleration a is calculated according to the following formula (2):
wherein a is the maximum acceleration of the connected piece relative to the radial direction of the bolt, F is the maximum vibration force of the connected piece under the condition of the maximum acceleration a, M is the total mass of the connected piece, and n is the number of bolts connected with the connected piece.
According to one embodiment of the invention, the failure evaluation of the bolt is performed according to the static friction force F2 and the maximum vibration force F, and comprises the following steps: comparing the maximum vibration force F with a preset time beta of a static friction force F2, wherein the value range of the beta is 0.8-0.9; if F is more than or equal to beta multiplied by F2, judging that the bolt is loosened; if F < β × F2 is present, the bolt is judged to be fastened.
According to an embodiment of the present invention, the method for evaluating the failure of the bolt in the earthquake further includes: and applying the equivalent external force to the bolt, and evaluating the axial strength of the bolt to judge whether the bolt yields.
According to one embodiment of the invention, the connected piece is a charging pile.
In order to achieve the above object, a second aspect of the present invention provides a failure evaluation device for a bolt in an earthquake, including: the method comprises the following steps: the first acquisition module is used for performing longitudinal seismic simulation to acquire the maximum axial response displacement U at the bolt; the second acquisition module is used for carrying out statics simulation so as to acquire an equivalent external force of the bolt meeting the maximum axial response displacement U; the first applying module is used for acquiring bolt pretightening force f0, applying the pretightening force f0 to the bolt and carrying out bolt pretightening force analysis; the second applying module is used for applying the equivalent external force to the bolt and carrying out the static simulation analysis to obtain the residual pretightening force f1 of the bolt; a first calculation module, which is used for calculating a static friction force f2 between the bolt and the connected piece under the action of the residual pretightening force f1 according to the residual pretightening force f 1; the third acquisition module is used for carrying out transverse seismic simulation so as to acquire the maximum acceleration a of the connected piece relative to the radial direction of the bolt; a second calculation module for calculating a maximum vibration force F of the connected member under a maximum acceleration a condition; an evaluation module for performing a failure evaluation of the bolt as a function of the static friction force F2 and the maximum vibration force F.
According to one embodiment of the invention, the first calculation module calculates the static friction force f2 between the bolt and the connected piece under the action of the residual pretightening force f1 according to the following formula (1):
f2＝f1×μ (1)；
wherein f1 is the residual pretightening force, f2 is the static friction force between the bolt and the connected piece under the action of the residual pretightening force f1, and mu is the friction coefficient of the contact area between the bolt and the connected piece.
According to an embodiment of the present invention, the second calculation module calculates the maximum vibration force F of the attached member under the condition of the maximum acceleration a according to the following formula (2):
wherein a is the maximum acceleration of the connected piece relative to the radial direction of the bolt, F is the maximum vibration force of the connected piece under the condition of the maximum acceleration a, M is the total mass of the connected piece, and n is the number of bolts connected with the connected piece.
According to an embodiment of the invention, the evaluation module is specifically configured to: comparing the maximum vibration force F with a preset time beta of a static friction force F2, wherein the value range of the beta is 0.8-0.9; if F is more than or equal to beta multiplied by F2, judging that the bolt is loosened; if F < β × F2 is present, the bolt is judged to be fastened.
According to an embodiment of the invention, the second applying module is further configured to: and applying the equivalent external force to the bolt, and evaluating the axial strength of the bolt to judge whether the bolt yields.
According to one embodiment of the invention, the connected piece is a charging pile.
The invention has the beneficial effects that:
(1) the invention mainly adopts a simulation means to carry out virtual evaluation in the product design stage, and can play the roles of saving research and development expenses, shortening development period and improving product quality.
(2) The method considers the coupling effect of the pretightening force and the earthquake, carries out linear superposition analysis on the equivalent external force and the pretightening force of the bolt, can evaluate the residual pretightening force of the bolt in the earthquake process, and has high accuracy of the evaluation result.
(3) The invention can research the change of the bolt in the earthquake process by a simulation means and can well guide the improvement design of the product.
Drawings
FIG. 1 is a flow diagram of a method for failure assessment of a bolt in an earthquake according to one embodiment of the invention;
FIG. 2 is a schematic illustration of a bolted connection according to one embodiment of the present invention;
FIG. 3 is a schematic diagram of a method for failure assessment of bolts in an earthquake according to one embodiment of the present invention;
FIG. 4 is a block schematic diagram of a bolt failure evaluation apparatus in an earthquake according to one embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
FIG. 1 is a flow chart of a method for failure assessment of a bolt in an earthquake according to one embodiment of the invention. As shown in fig. 1, the method comprises the steps of:
and S1, performing longitudinal seismic simulation to obtain the maximum axial response displacement U at the bolt.
And S2, performing statics simulation to obtain the equivalent external force of the bolt meeting the maximum axial response displacement U.
S3, acquiring bolt pretightening force f0, applying pretightening force f0 to the bolt and analyzing the pretightening force of the bolt.
The pretightening force f0 is mainly related to the performance grade, specification and the like of the bolt and can be obtained by inquiring a related manual.
And S4, applying equivalent external force to the bolt, and performing statics simulation analysis to obtain the residual pretightening force f1 of the bolt.
S5, calculating static friction force f2 between the bolt and the connected piece under the action of the residual pretightening force f1 according to the residual pretightening force f 1.
In one embodiment of the invention, the static friction force f2 between the bolt and the connected piece under the action of the residual pretightening force f1 is calculated according to the following formula (1):
f2＝f1×μ (1)；
f1 is residual pretightening force, f2 is static friction force between the bolt and the connected piece under the action of the residual pretightening force f1, and mu is a friction coefficient of a contact area between the bolt and the connected piece.
And S6, performing transverse seismic simulation to obtain the maximum acceleration a of the connected piece relative to the radial direction of the bolt.
And S7, calculating the maximum vibration force F of the connected piece under the condition of the maximum acceleration a.
In one embodiment of the invention, the maximum vibration force F of the connected part under the condition of the maximum acceleration a is calculated according to the following formula (2):
wherein a is the maximum acceleration of the connected piece relative to the radial direction of the bolt, F is the maximum vibration force of the connected piece under the condition of the maximum acceleration a, M is the total mass of the connected piece, and n is the number of the bolts connected with the connected piece.
And S8, performing failure evaluation of the bolt according to the static friction force F2 and the maximum vibration force F.
According to one embodiment of the invention, the failure evaluation of the bolt is carried out according to the static friction force F2 and the maximum vibration force F, and comprises the following steps: comparing the maximum vibratory force F to a predetermined multiple β of the static friction force F2, wherein β is less than 1; if F is more than or equal to beta multiplied by F2, judging that the bolt is loosened; if F < β × F2 is present, the bolt is judged to be fastened.
In the embodiment of the invention, the value range of β is 0.8-0.9, for example, 0.85.
Specifically, the bolt connection diagram can be seen in fig. 2, where 1 is a connected member and 2 is a bolt.
As shown in fig. 3, the bolt is subjected to longitudinal seismic simulation (simulation analysis of seismic longitudinal waves) by simulation software, so as to obtain the maximum axial displacement U at the bolt. And carrying out statics analysis on the product, and applying an equivalent external force to one side of the shaft end of the bolt to enable the axial displacement of the bolt to be equal to the maximum axial displacement U. And (3) carrying out statics analysis on the product, inquiring the bolt pretightening force f0 suitable for loading according to related parameters such as the performance grade and specification of the bolt, and calculating a product simulation result when the pretightening force f0 is applied. On the basis, the equivalent external force obtained in the previous step is applied to one side of the shaft end of the bolt, and the residual pretightening force f1 of the bolt is obtained through calculation. The static friction force f2 between the bolt and the connected member is calculated according to the formula f2 ═ f1 × μ, where μ is the friction coefficient of the contact area between the bolt and the connected member. And performing transverse earthquake simulation by using over-simulation software to obtain the maximum acceleration a of the connected piece relative to the radial direction of the bolt, and calculating the maximum vibration force F under the condition of the maximum acceleration a by using a formula F which is a multiplied by m. Finally, F is compared with beta x F2, when F is larger than or equal to beta x F2, the bolt is judged to be loosened, and otherwise, the bolt is judged to be fastened.
Therefore, the method considers the coupling effect of the pretightening force and the earthquake, has high accuracy of an evaluation result, can research the change of the bolt in the earthquake process by a simulation means, and can well guide the improvement design of a product.
In the present invention, the above described failure evaluation method does not involve material nonlinearity of the bolt. The seismic and static simulations may be performed in the Abaqus software.
According to an embodiment of the present invention, the method for evaluating the failure of the bolt in the earthquake may further include: and applying an equivalent external force to the bolt, and evaluating the axial strength of the bolt to judge whether the bolt yields.
Specifically, as shown in fig. 3, when longitudinal seismic simulation is performed, an equivalent external force is applied to the bolt, and the axial strength of the bolt is evaluated to determine whether the bolt yields, and if it is determined that the bolt yields, the bolt is damaged, and transverse seismic simulation is not required.
In one embodiment of the present invention, the connected member may be a charging pile. The method for evaluating the failure of the bolt in the earthquake can be used for researching the change of the bolt in the charging pile in the earthquake, so that the improvement design of the charging pile can be well guided.
In summary, according to the failure evaluation method for the bolt in the earthquake, provided by the embodiment of the invention, longitudinal earthquake simulation is carried out to obtain the maximum axial response displacement U at the bolt; acquiring an equivalent external force at the bolt position meeting the maximum axial response displacement U; acquiring bolt pretightening force f0, applying pretightening force f0 to the bolt, analyzing the pretightening force of the bolt, applying equivalent external force to the bolt, and acquiring residual pretightening force f1 of the bolt; calculating the static friction force f2 between the bolt and the connected piece under the action of f1 according to f 1; performing transverse earthquake simulation to obtain the maximum acceleration a of the connected piece relative to the radial direction of the bolt; calculating the maximum vibration force F of the connected piece under the condition of the maximum acceleration a; the bolt failure evaluation was performed according to F2 and F. The method considers the coupling effect of the pretightening force and the earthquake, carries out linear superposition analysis on the equivalent external force and the bolt pretightening force, can evaluate the residual pretightening force of the bolt in the earthquake process, has high accuracy of an evaluation result, can research the change of the bolt in the earthquake process by a simulation means, and can well guide the improvement design of products.
Corresponding to the failure evaluation method of the bolt in the earthquake, the invention also provides a failure evaluation device of the bolt in the earthquake. Since the device embodiment of the present invention corresponds to the method embodiment described above, details that are not disclosed in the device embodiment may refer to the method embodiment described above, and are not described again in the present invention.
FIG. 4 is a block diagram of a bolt failure evaluation apparatus in an earthquake according to one embodiment of the present invention. As shown in fig. 4, the apparatus includes: a first obtaining module 10, a second obtaining module 20, a first applying module 30, a second applying module 40, a first calculating module 50, a third obtaining module 60, a second calculating module 70, and an evaluating module 80.
The first acquisition module 10 is used for performing seismic mechanics simulation to acquire the maximum axial response displacement U at the bolt; the second obtaining module 20 is configured to perform statics simulation to obtain an equivalent external force at the bolt that satisfies the maximum axial response displacement U; the first applying module 30 is used for acquiring bolt pretightening force f0, applying pretightening force f0 to the bolt and analyzing the bolt pretightening force; the second applying module 40 is used for applying an equivalent external force to the bolt, and performing statics simulation analysis to obtain a residual pretightening force f1 of the bolt; the first calculation module 50 is used for calculating the static friction force f2 between the bolt and the connected piece under the action of the residual pretightening force f1 according to the residual pretightening force f 1; the third obtaining module 60 is used for performing transverse seismic simulation to obtain the maximum acceleration a of the connected piece relative to the radial direction of the bolt; the second calculating module 70 is used for calculating the maximum vibration force F of the connected piece under the condition of the maximum acceleration a; the evaluation module 80 is used for the failure evaluation of the bolt based on the static friction force F2 and the maximum vibration force F.
According to one embodiment of the invention, the first calculation module 50 calculates the static friction force f2 between the bolt and the connected piece under the action of the residual pretightening force f1 according to the following formula (1):
f2＝f1×μ (1)；
f1 is residual pretightening force, f2 is static friction force between the bolt and the connected piece under the action of the residual pretightening force f1, and mu is a friction coefficient of a contact area between the bolt and the connected piece.
According to one embodiment of the present invention, the second calculation module 60 calculates the maximum vibration force F of the connected member under the condition of the maximum acceleration a according to the following formula (2):
wherein a is the maximum acceleration of the connected piece relative to the radial direction of the bolt, F is the maximum vibration force of the connected piece under the condition of the maximum acceleration a, M is the total mass of the connected piece, and n is the number of the bolts connected with the connected piece.
According to an embodiment of the invention, the evaluation module 70 is specifically configured to: comparing the maximum vibratory force F to a preset multiple β of the static friction force F2, wherein β is less than 1; if F is more than or equal to beta multiplied by F2, judging that the bolt is loosened; if F < β × F2 is present, the bolt is judged to be fastened.
Furthermore, the value range of beta is 0.8-0.9.
According to an embodiment of the invention, the second application module 40 is further configured to: and applying an equivalent external force to the bolt, and evaluating the axial strength of the bolt to judge whether the bolt yields.
According to one embodiment of the invention, the connected piece can be a charging pile.
According to the failure evaluation device of the bolt in the earthquake, the first acquisition module is used for performing earthquake mechanics simulation to acquire the maximum axial response displacement U at the bolt, the second acquisition module is used for performing statics simulation to acquire the equivalent external force meeting the maximum axial response displacement U at the bolt, the first applying module is used for acquiring the pretightening force F0 of the bolt, applying the pretightening force F0 to the bolt and analyzing the pretightening force of the bolt, the second applying module is used for applying the equivalent external force to the bolt and analyzing the statics simulation to acquire the residual pretightening force F1 of the bolt, the first calculating module is used for calculating the static friction force F2 between the bolt and the connected piece under the action of the residual pretightening force F1 according to the residual pretightening force F1, the third acquisition module is used for performing transverse earthquake simulation to acquire the maximum acceleration a of the connected piece relative to the radial direction of the bolt, the second calculating module is used for calculating the maximum vibration force F of the connected piece under the condition of the maximum acceleration a, the evaluation module performs a failure evaluation of the bolt based on the static friction force F2 and the maximum vibrational force F. Therefore, the failure evaluation device considers the coupling effect of the pretightening force and the earthquake, carries out linear superposition analysis on the equivalent external force and the pretightening force of the bolt, can evaluate the residual pretightening force of the bolt in the earthquake process, has high accuracy of an evaluation result, can research the change of the bolt in the earthquake process through a simulation means, and can well guide the improved design of a product.
In the present invention, any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A failure evaluation method for a bolt in an earthquake is characterized by comprising the following steps:
performing longitudinal seismic simulation to obtain the maximum axial response displacement U at the bolt;
performing statics simulation to obtain an equivalent external force of the bolt meeting the maximum axial response displacement U;
acquiring bolt pretightening force f0, applying the pretightening force f0 to the bolt, and performing bolt pretightening force analysis;
applying the equivalent external force to the bolt, and performing the static simulation to obtain the residual pretightening force f1 of the bolt;
calculating static friction force f2 between the bolt and a connected piece under the action of the residual pretightening force f1 according to the residual pretightening force f 1;
performing transverse seismic simulation to obtain the maximum acceleration a of the connected piece relative to the radial direction of the bolt;
calculating the maximum vibration force F of the connected piece under the condition of the maximum acceleration a;
and performing failure evaluation of the bolt according to the static friction force F2 and the maximum vibration force F.
2. The method for evaluating the failure of the bolt in the earthquake according to the claim 1, wherein the static friction force f2 between the bolt and the connected piece under the action of the residual pretightening force f1 is calculated according to the following formula (1):
f2＝f1×μ (1)；
wherein f1 is the residual pretightening force, f2 is the static friction force between the bolt and the connected piece under the action of the residual pretightening force f1, and mu is the friction coefficient of the contact area between the bolt and the connected piece.
3. The method for evaluating the failure of a bolt in an earthquake according to claim 1, wherein the maximum vibration force F of the connected member under the condition of the maximum acceleration a is calculated according to the following formula (2):
wherein a is the maximum acceleration of the connected piece relative to the radial direction of the bolt, F is the maximum vibration force of the connected piece under the condition of the maximum acceleration a, M is the total mass of the connected piece, and n is the number of bolts connected with the connected piece.
4. The method for evaluating the failure of a bolt in an earthquake according to claim 1, wherein the evaluation of the failure of the bolt based on the static friction force F2 and the maximum vibration force F comprises:
comparing the maximum vibration force F with a preset time beta of a static friction force F2, wherein the value range of the beta is 0.8-0.9;
if F is more than or equal to beta multiplied by F2, judging that the bolt is loosened;
if F < β × F2 is present, the bolt is judged to be fastened.
5. The method for evaluating the failure of a bolt in an earthquake according to claim 1, further comprising:
and applying the equivalent external force to the bolt, and evaluating the axial strength of the bolt to judge whether the bolt yields.
6. The method for evaluating the failure of a bolt in an earthquake according to any one of claims 1 to 5, wherein the connected member is a charging pile.
7. A failure evaluation device for a bolt in an earthquake, comprising:
the first acquisition module is used for performing longitudinal seismic simulation to acquire the maximum axial response displacement U at the bolt;
the second acquisition module is used for performing statics simulation to acquire an equivalent external force at the bolt under the condition that the maximum axial response displacement U is met;
the first applying module is used for acquiring bolt pretightening force f0, applying pretightening force f0 to the bolt and analyzing the bolt pretightening force;
the second applying module is used for applying the equivalent external force to the bolt to perform the static simulation so as to obtain the residual pretightening force f1 of the bolt;
a first calculation module, which is used for calculating a static friction force f2 between the bolt and a connected piece under the action of the residual pretightening force f1 according to the residual pretightening force f 1;
the third acquisition module is used for carrying out transverse seismic simulation so as to acquire the maximum acceleration a of the connected piece relative to the radial direction of the bolt;
a second calculation module for calculating a maximum vibration force F of the connected member under a maximum acceleration a condition;
an evaluation module for performing a failure evaluation of the bolt as a function of the static friction force F2 and the maximum vibration force F.
8. The device for evaluating the failure of a bolt in an earthquake according to claim 7, wherein the evaluation module is specifically configured to:
comparing the maximum vibration force F with a preset time beta of a static friction force F2, wherein the value range of the beta is 0.8-0.9;
if F is more than or equal to beta multiplied by F2, judging that the bolt is loosened;
if F < β × F2 is present, the bolt is judged to be fastened.
9. The in-earthquake bolt failure assessment device according to claim 7, wherein said second application module is further configured to: and applying the equivalent external force to the bolt, and evaluating the axial strength of the bolt to judge whether the bolt yields.
10. The apparatus for evaluating the failure of a bolt in an earthquake according to any one of claims 7 to 9, wherein the connected member is a charging pile.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106547982A (en) * | 2016-10-31 | 2017-03-29 | 沈阳鼓风机集团股份有限公司 | A kind of Compressor Group given tensile load computational methods and device |
| CN107609293A (en) * | 2017-09-22 | 2018-01-19 | 上海航天测控通信研究所 | The determination methods of product loosened fastener in random vibration |
| CN110610063A (en) * | 2019-10-21 | 2019-12-24 | 山东泰开高压开关有限公司 | Method for determining whether bolt type selection is correct |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106547982A (en) * | 2016-10-31 | 2017-03-29 | 沈阳鼓风机集团股份有限公司 | A kind of Compressor Group given tensile load computational methods and device |
| CN107609293A (en) * | 2017-09-22 | 2018-01-19 | 上海航天测控通信研究所 | The determination methods of product loosened fastener in random vibration |
| CN110610063A (en) * | 2019-10-21 | 2019-12-24 | 山东泰开高压开关有限公司 | Method for determining whether bolt type selection is correct |
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