CN112241561A - Method and system for monitoring macroscopic stress index of component and storage medium - Google Patents
Method and system for monitoring macroscopic stress index of component and storage medium Download PDFInfo
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Abstract
The invention discloses a method, a system and a storage medium for monitoring macroscopic stress indexes of a component, which are characterized in that stress monitoring data on at least one section of a structural component to be detected are obtained, and the section internal force of the corresponding section is determined based on the stress monitoring data; and fitting the maximum cross-section internal force of the inversion component, and determining a macroscopic stress index of the whole component according to the maximum cross-section internal force. According to the invention, stress data of a measuring point is collected and calculated on one or more sections of the structural member, the internal force of each section is calculated, and the macroscopic stress index of the whole member is further inverted according to the internal force of the sections, so that the evaluation of the stress level of the whole member is effectively realized.
Description
Technical Field
The invention relates to a construction process monitoring and health monitoring technology in civil engineering, in particular to monitoring of macroscopic stress of a corresponding component.
Background
The existing component stress index is generally applied to the field of structural design, is a theoretical result obtained based on finite element calculation, and no implementation method for obtaining an actual result of the component stress index based on monitoring data exists in the monitoring field.
The proposal provides a working stress monitoring device and a method of a concrete structure, as the Chinese patent application with the publication number CN108152127A, the proposal is that a concrete sample is manufactured, and a first piezoelectric aggregate and a second piezoelectric aggregate are arranged in the concrete sample; loading a first voltage on the first piezoelectric aggregate, wherein the first voltage is constant; performing a pressurization experiment on the concrete test piece to obtain a stress wave parameter stress curve; the stress wave parameters include: wave velocity, amplitude and/or spectral area; acquiring stress wave parameters of a concrete member to be detected; and obtaining the working stress of the concrete member to be tested according to the stress wave parameter stress curve and the stress wave parameter.
Chinese patent application publication No. CN102620634A proposes a stress-strain monitoring method for important structural members by arranging a plurality of monitoring points on a building structure; at least three strain sensors are fixedly arranged on each monitoring point of the building structure; collecting and storing data of the strain sensors, and taking data corresponding to each monitoring point as initial working condition data of the monitoring point; collecting the data of the strain sensor again and correcting the temperature; storing the data after temperature correction, and taking the data corresponding to each monitoring point as the current working condition data of the monitoring point; and analyzing the stress and strain of the corresponding monitoring point according to the current working condition data and the initial working condition data.
These solutions measure the stress at the measurement point of the component by means of a stress-strain sensor mounted on the component, but they do not further form a uniform stress indicator at the macroscopic level of the component from these stress data. If the existing scheme cannot form a uniform stress index, the monitored data can only reflect the situation of the position of the sensor, and the effective safety evaluation of the component object can not be carried out.
Disclosure of Invention
Aiming at the problems of the existing component stress monitoring scheme, the invention aims to provide a monitoring method of a component macroscopic stress index, which can obtain the actual result of the component stress index based on monitoring data and determine the macroscopic stress index of the whole component. Meanwhile, on the basis, the invention further provides a monitoring system and a storage medium for the macroscopic stress index of the component.
In order to achieve the above object, the present invention provides a method for monitoring macroscopic stress index of a member, which comprises
Acquiring stress monitoring data on at least one section of a structural member to be detected, and determining the section internal force of the corresponding section based on the stress monitoring data;
and fitting the maximum cross-section internal force of the inversion component, and determining a macroscopic stress index of the whole component according to the maximum cross-section internal force.
Further, in the monitoring method, stress monitoring data on the cross section is obtained by monitoring a plurality of stress-strain sensors distributed on the cross section.
Further, the cross-sectional internal force calculated and determined in the monitoring method at least comprises an axial force and a bending moment.
Further, the monitoring method is based on the internal force monitoring calculation results of a plurality of sections in the component, and the maximum section internal force in the component is calculated by using the assumed component internal force distribution function.
Further, the distribution function of the internal force of the member can be divided into a linear distribution function, a polygonal distribution function and a parabolic distribution function according to different forms of the axial force, the transverse force and the boundary condition applied to the member. Therefore, in practical application, the corresponding internal force distribution function form can be selected according to the stress and the boundary condition.
Further, according to the maximum cross-section internal force obtained through calculation, the macroscopic stress index of the component is calculated through a strength and stable stress calculation mode in the monitoring method.
In order to achieve the above object, the present invention further provides a monitoring system for a macroscopic stress indicator of a component, where the monitoring system includes a processor and a processing program, and the processor can execute the processing program to perform monitoring and evaluation on the macroscopic stress indicator of the component according to the above monitoring method.
In order to achieve the above object, the present invention also provides a storage medium including a stored program that executes the above monitoring method.
According to the invention, stress data of a measurement point is collected and calculated on one or more sections of the structural member, the internal force (including axial force, bending moment and the like) of each section is calculated, and the macroscopic stress index of the whole member is further inverted according to the internal force of the sections, so that the evaluation of the stress level of the whole member is effectively performed, namely the safety evaluation of the whole member can be effectively performed.
Moreover, the calculation result of the scheme can directly correspond to a design and evaluation method in the structural specification, the macroscopic index level of the component is reflected, and the safety of the component can be accurately evaluated.
Drawings
The invention is further described below in conjunction with the appended drawings and the detailed description.
FIG. 1 is a schematic flow chart of a method for monitoring macroscopic stress indicators of a component in an embodiment of the present invention;
FIG. 2 is a basic shape example of a distribution of bending moments in a member as defined in the examples of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
The macroscopic stress index related in the scheme is a stress index which can reflect the stress safety level of the component and is obtained by further calculating the internal force value of the component based on the monitoring of the measuring section after considering the boundary conditions, the load, the stability, the plasticity development and other comprehensive factors of the component.
In the monitoring method, stress-strain sensors are arranged on one or more sections of the structural member to be monitored, and the stress data of a measuring point on each section is acquired and calculated by the arranged stress-strain sensors.
Then, based on the calculated stress data of the measurement point on each section, the internal force of each section is calculated, wherein the internal force includes an axial force, a bending moment and the like.
And then, inverting the maximum cross-section internal force of the structural member to be measured by fitting according to the cross-section internal force.
And finally, deducing a macroscopic stress index of the whole structural member to be tested based on the maximum cross-section internal force of the structural member to be tested determined by fitting inversion, and effectively evaluating the whole stress level of the structural member.
The fitting inversion here refers to that in the case where only data of a limited area (such as a plurality of monitoring sections on a component) can be obtained by monitoring, the monitoring result of the macroscopic whole body is estimated by using the set distribution function form through the limited measurement data, and in this example, the monitoring result refers to the macroscopic stress index of the component.
Therefore, the scheme can obtain the actual result of the stress index of the component based on the monitoring data, carry out macroscopic overall safety evaluation on the component, and directly correspond to the stress index concept in the structural specification and be consistent with the structural specification system.
With respect to the above-described embodiments, specific implementation processes thereof will be specifically described below.
In the embodiment, the detection of the macroscopic stress index of the structural member is realized based on an inversion calculation mode, and the macroscopic stress index of the structural member is an actual result of acquiring the stress index of the structural member based on monitoring data.
Referring to fig. 1, a flow chart of an implementation principle of the macro stress indicator monitoring of the member in the present example is shown. As can be seen from the figure, the process of monitoring the macroscopic stress indicator of the structural member in this example mainly includes the following steps:
(1) selecting m sections on a component to be monitored, arranging a plurality of sensors on each section, and monitoring and calculating stress data of corresponding sensor measuring points on each section;
(2) calculating the internal force of the section according to the stress data of the measuring point on the same section, wherein the internal force of the section comprises an axial force, a bending moment and the like;
(3) calculating the maximum section internal force of the member through fitting inversion according to the calculated internal forces on the plurality of sections of the member;
(4) and calculating the macroscopic stress index of the component according to the maximum cross-sectional internal force obtained by calculation and through a strength and stable stress calculation formula.
Specifically, m sections are selected on the component, each section is provided with a measuring point, and a plurality of strain gauges are arranged on each section. Let n strain gauges be arranged on the ith cross section, and the stress set { sigma delta ] of the cross section measurement point is obtained through measurement and calculationj}j＝1,2,..,nThe i section internal force [ N, M ] can be calculated by a material mechanics calculation methody,Mz]i。
It should be noted that the sensor used in this example is any sensor that can collect stress or strain data, and examples of the sensor include, but are not limited to, a strain gauge, a resistance strain gauge, a vibrating wire strain gauge, and the like.
Further, for upper building structures, the magnitude of the axial force of the element is typically kept constant between the two ends of the element, whereby the further inversion is performed in this example mainly for the maximum bending moment of the element.
To this end, the present example further defines a bending moment distribution pattern of the component. By way of example, the component bending moment distribution pattern defined in this example consists of the bending moment distribution shape and its key parameters.
Further by way of example, the bending moment distribution shape in this example includes 6 base shapes and each shape can be expressed by a set of curvilinear functions. Therefore, the determined distribution function form is provided for the fitting inversion process, and the distribution function form can be freely selected according to the actual condition of the component in the actual monitoring process.
Referring to FIG. 2, an exemplary graph of the 6 basic bending moment profiles given in this example is shown.
Wherein, the shape shown in the (a) diagram can be expressed by the following curve function:
M＝k·x+b；
where k represents the slope of the line of the function, b represents the intercept of the line of the function, x represents the distance from one end of the member, and M represents the magnitude of the bending moment at the x position.
(b) The shape shown in the figure can be expressed by the following curve function:
M＝k·x+b；
where k represents the slope of the line of the function, b represents the intercept of the line of the function, x represents the distance from one end of the member, and M represents the magnitude of the bending moment at the x position.
(c) The shape shown in the figure can be expressed by the following curve function:
M＝k·x+b,0≤x≤L/2；
wherein k represents the slope of the straight line of the function, b represents the intercept of the straight line of the function, L represents the length of the member, x represents the distance from one end of the member, and M represents the magnitude of the bending moment at the position of x;
(d) the shape shown in the figure can be expressed by the following curve function:
M＝k·x+b,0≤x≤L/2；
where k represents the slope of the straight line of the function, b represents the intercept of the straight line of the function, L represents the length of the member, x represents the distance from one end of the member, and M represents the magnitude of the bending moment at the x position.
(e) The shape shown in the figure can be expressed by the following curve function:
M＝k·(L/2-x)2+b；
where k represents the slope of the straight line of the function, b represents the intercept of the straight line of the function, L represents the length of the member, x represents the distance from one end of the member, and M represents the magnitude of the bending moment at the x position.
(f) The shape shown in the figure can be expressed by the following curve function:
M＝k·(L/2-x)2+b；
where k represents the slope of the straight line of the function, b represents the intercept of the straight line of the function, L represents the length of the member, x represents the distance from one end of the member, and M represents the magnitude of the bending moment at the x position.
On the basis, in the implementation of the present example, when the number m of the selected cross sections is 1, that is, the macroscopic stress index of the internal force inversion member on one cross section needs to be determined together with partial results of theoretical calculation, the method includes:
(1) determining the length distance l of the monitoring section from the end part of the member;
(2) respectively determining a component bending moment distribution mode similar to a theoretical result on two main planes (y, z) of the component through analysis and determination;
by way of example, when determining the bending moment distribution mode of the component, the reasonable distribution mode can be determined by finite element theoretical calculation before monitoring and field practical experience.
(3) Extracting a parameter k of the selected bending moment distribution mode according to a finite element calculation result, namely a finite element theoretical calculation result before monitoring;
(4) calculating the cross-sectional internal forces [ N, M ] from the sensor arrangement on the cross-sectiony,Mz]；
(5) Utilizing the cross-section internal force [ N, M ] obtained in the step (4)y,Mz]Calculating the intercept b of the bending moment distribution mode selected in the step (2), wherein all parameters of the bending moment mode are determined;
(6) calculating the maximum bending moment in two main planes of the component through a bending moment distribution mode, and determining the maximum cross-sectional internal force [ N, M ] of the componenty,Mz]*；
(7) And (3) calculating the stress index of the component by utilizing a component stress index calculation formula given by a structural design standard and combining the bending moment distribution mode determined in the step (2) and the maximum cross-sectional internal force of the component determined in the step (6).
According to the scheme, after comprehensive factors such as boundary conditions, loads, stability and plasticity development of the component are considered, the safety of the component can be evaluated macroscopically integrally, the stress index concept in the structural specification can be directly corresponding to the stress index concept in the structural specification, and the stress index concept is consistent with the structural specification system.
When the number m of the selected sections is more than 1, fitting and parameter fixing can be carried out on the selected member bending moment mode through the internal force calculation result on each section, and the method comprises the following steps:
(1) the length distance l of each monitored cross section from the end of the member is determined.
(2) Through analysis, a member bending moment distribution mode similar to a theoretical result is respectively determined for two main planes (y, z) of the member, namely a reasonable distribution mode is selected through finite element theoretical calculation before monitoring and field actual experience.
(3) Calculating cross-sectional internal forces from sensor placement on the cross-sectiony,Mz]}。
(4) Utilizing the cross-section internal force [ N, M ] obtained in the step (3)y,Mz]) And fitting and parameter fixing are carried out on the parameters k and b of the bending moment distribution mode, and all the parameters of the bending moment mode are determined at the moment.
The method of fitting the parameters may be determined according to practical requirements, such as a least squares method, but is not limited thereto.
(5) Calculating the maximum bending moment in two main planes of the component through a bending moment distribution mode, and determining the maximum cross-sectional internal force [ N, M ] of the componenty,Mz]*。
(6) And (3) calculating the stress index of the component by utilizing a component stress index calculation formula given by a structural design standard and combining the bending moment distribution mode determined in the step (2) and the maximum cross-sectional internal force of the component determined in the step (5).
The monitoring method of the macroscopic stress index of the component formed based on the scheme can be presented in a corresponding software system form in specific application, and effective macroscopic overall safety evaluation of the component can be realized.
Specifically, the present embodiment is directed to the method for monitoring the macroscopic stress index of the component, and constitutes a corresponding software program, where the software program executes the method for monitoring the macroscopic stress index of the component, and is stored in a corresponding storage medium, so as to be invoked and executed by a processor.
Therefore, when the processor of the system calls and executes the software program, the effective macroscopic overall safety evaluation of the component can be realized according to the component macroscopic stress index monitoring method.
Therefore, when only data of a limited area (such as a plurality of monitoring sections on a component) can be obtained through monitoring, the monitoring result of the whole macro, namely the macro stress index of the component, can be estimated by using the set distribution function form through the limited measurement data.
Therefore, the scheme can obtain the actual result of the stress index of the component based on the monitoring data, carry out macroscopic overall safety assessment on the component, and can directly correspond to the stress index concept in the structural specification and be consistent with the structural specification system.
Finally, it should be noted that the above-mentioned method of the present invention, or specific system units, or some of the above-mentioned units, are purely software structures, and can be distributed on a physical medium such as a hard disk, an optical disk, or any electronic device (such as a smart phone, a computer readable storage medium) through a program code, and when the program code is loaded and executed by a machine (such as a smart phone), the machine becomes an apparatus for implementing the present invention. The methods and apparatus of the present invention may also be embodied in the form of program code transmitted over some transmission medium, such as electrical cable, fiber optics, or via any other form of transmission, wherein, when the program code is received and loaded into and executed by a machine, such as a smart phone, the machine becomes an apparatus for practicing the invention.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A method for monitoring the macroscopic stress index of a member is characterized by comprising
Acquiring stress monitoring data on at least one section of a structural member to be detected, and determining the section internal force of the corresponding section based on the stress monitoring data;
and fitting the maximum cross-section internal force of the inversion component, and determining a macroscopic stress index of the whole component according to the maximum cross-section internal force.
2. The method for monitoring the macroscopic stress index of the structural member as recited in claim 1, wherein the stress monitoring data on the cross section in the monitoring method is obtained by monitoring a plurality of stress strain sensors distributed on the cross section.
3. The method for monitoring the macroscopic stress index of the structural member as recited in claim 1, wherein the cross-sectional forces computationally determined in the monitoring method at least include axial forces and bending moments.
4. The method for monitoring the macroscopic stress indicator of the structural member as recited in claim 1, wherein the method for monitoring is based on the internal force monitoring calculation results of a plurality of sections in the structural member, and the maximum section internal force in the structural member is calculated by using the determined distribution function of the internal force of the structural member.
5. The method for monitoring macroscopic stress indicator of a member as recited in claim 4, wherein the distribution function of the internal force of the member is different according to the axial force, the transverse force and the boundary condition, and comprises a linear distribution function, a polygonal distribution function and a parabolic distribution function.
6. The method for monitoring the macroscopic stress index of the member as recited in claim 1, wherein the macroscopic stress index of the member is calculated by a strength and stable stress calculation method according to the calculated maximum cross-sectional internal force.
7. A system for monitoring a macroscopic stress indicator of a component, the system comprising a processor and a processing program, wherein the processor is capable of executing the processing program to perform a monitoring evaluation of the macroscopic stress indicator of the component according to the monitoring method of any one of claims 1 to 6.
8. A storage medium comprising a stored program, characterized in that the program performs the monitoring method of any one of claims 1-6.
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Application publication date: 20210119 |