Stress Evaluation Method for the Column Foot Joint of Concrete-Filled Steel Tubular Columns Used in Waste Incineration Power Generation

Abstract

The present invention relates to the technical field of stress, and particularly relates to a method for stress evaluation of the column base joint of a concrete-filled steel tube column used for waste incineration power generation, including: screening all key areas of the foot joint according to the displacement property of the key area of the foot joint to obtain all deformed key areas of the foot joint; screening the deformed key areas of the foot joint according to the stress uniformity of the deformed key areas of the foot joint to obtain all key areas of the foot joint to be corrected; taking the updated vector angle and stress tolerance of each key area of the foot joint to be corrected as the stress vector integration result of each key area of the foot joint to be corrected; and evaluating the stress of the column base joint of the concrete-filled steel tube column based on the stress vector integration result. The present invention improves the accuracy of the stress evaluation result of the column base joint of the concrete-filled steel tube column.

Description

Technical Field

[0001] The invention relates to the field of stress technology, and in particular to a stress assessment method for a column foot node of a steel tube concrete column used for waste incineration power generation. Background Art

[0002] With the growing global energy demand and the continuous improvement of environmental protection requirements, waste incineration power generation, as an important way to utilize new energy, has received widespread attention and application. However, the design and construction of waste incineration power plants involve many complex structural problems, especially the structural stability and safety under high temperature environment, vibration and load. In waste incineration power plants, steel tube concrete columns, as a new type of structure, have been widely used in various buildings and industrial facilities due to their excellent mechanical properties and seismic resistance. Steel tube concrete columns are often used to support heavy equipment such as waste incinerators and structural members in high temperature environments. The column foot node is an important part connecting the foundation and the superstructure, and its bearing performance directly affects the stability and safety of the entire structure.

[0003] In order to conduct stress assessment on the column foot nodes of steel tube concrete columns for waste incineration power generation, loading experiments are often carried out on the key stress-bearing areas of the column foot of steel tube concrete columns. By configuring the corresponding load, the stress distribution is analyzed, and then combined with the stress analysis, the stress tolerance is evaluated. In the process of analyzing the stress degree, some areas may be affected by the deformation interference after loading, resulting in changes in the force direction. If the force direction is not compensated and updated, according to the normal stress analysis, the inaccurate stress direction will lead to errors in the stress tolerance, making the stress assessment results inaccurate. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a method for evaluating the stress of the column foot node of a steel tube concrete column for waste incineration power generation, the method comprising:

[0005] Obtain video images of several key areas of foot nodes in the foot node area of ​​the steel tube concrete column, and the stress bearing capacity of each key area of ​​the foot node;

[0006] Divide the video image of the key area of ​​the foot node into several frames of grayscale images of the key area of ​​the foot node; obtain the key contour area in the grayscale image of the key area of ​​the foot node in each frame; obtain the displacement of the key area of ​​the foot node by analyzing the changes in the geometric center position of the key contour area in the grayscale images of the key area of ​​the foot node in different frames; screen all the key areas of the foot node according to the displacement of the key area of ​​the foot node to obtain all the deformed key areas of the foot node; obtain the force uniformity of each deformed key area of ​​the foot node by analyzing the similarity of the changes in the edge position of the key contour area in the grayscale images of the key areas of the deformed foot nodes in different frames; screen the deformed key areas of the foot node according to the force uniformity of the key areas of the deformed foot nodes to obtain all the key areas of the foot nodes to be corrected; obtain the update vector angle of the key area of ​​the foot node to be corrected according to the geometric center position of the key contour area in the grayscale image of the key area of ​​the foot node to be corrected in the last frame; use the update vector angle and stress tolerance of each key area of ​​the foot node to be corrected as the stress vector integration result of each key area of ​​the foot node to be corrected;

[0007] The stress at the base node of the steel tube concrete column is evaluated based on the stress vector integration results.

[0008] Preferably, the video image of the foot node key area is divided into a plurality of frame foot node key area grayscale images, including the specific method of:

[0009] The video image of the foot node key area is divided into several frame foot node key area images by using a frame rate-based extraction method; median filtering denoising and grayscale operations are performed on each frame foot node key area image to obtain a grayscale image of the foot node key area of ​​each frame.

[0010] Preferably, the method of obtaining the key contour area in the grayscale image of the key area of ​​the foot node of each frame includes:

[0011] For the grayscale image of the key area of ​​the foot node of any frame, the Canny edge detection algorithm is used to obtain all edge pixel points in the grayscale image of the key area of ​​the foot node of any frame; the closed area formed by all edge pixel points is used as the key contour area in the grayscale image of the key area of ​​the foot node of any frame.

[0012] Preferably, the method of obtaining the displacement of the key area of ​​the foot node by analyzing the change of the geometric center position of the key contour area in the grayscale image of the key area of ​​the foot node in different frames includes the following specific methods:

[0013] For any frame foot node key area grayscale image other than the first frame foot node key area grayscale image, the absolute value of the difference between the horizontal coordinate of the geometric center position of the key contour area in the any frame foot node key area grayscale image and the horizontal coordinate of the geometric center position of the key contour area in the first frame foot node key area grayscale image is recorded as the horizontal coordinate difference value of the key contour area in the any frame foot node key area grayscale image; the vertical coordinate of the geometric center position of the key contour area in the any frame foot node key area grayscale image and the vertical coordinate of the geometric center position of the key contour area in the first frame foot node key area grayscale image are recorded as the horizontal coordinate difference value of the key contour area in the any frame foot node key area grayscale image. The absolute value of the difference between the vertical coordinates of the geometric center positions of the key contour area is recorded as the vertical coordinate difference value of the key contour area in the grayscale image of the key contour area of ​​any frame foot node; the sum of the vertical coordinate difference value and the horizontal coordinate difference value of the key contour area in the grayscale image of the key contour area of ​​any frame foot node is recorded as the displacement difference value of the key contour area in the grayscale image of the key contour area of ​​any frame foot node; the normalized value of the mean of the displacement difference values ​​of the key contour area in the grayscale images of the key contour areas of all frames foot node except the grayscale image of the key contour area of ​​the first frame foot node is used as the displacement property of the key contour area of ​​the foot node.

[0014] Preferably, the method of screening all the key areas of the foot nodes according to the displacement of the key areas of the foot nodes to obtain all the key areas of the deformed foot nodes includes:

[0015] Preset a deformation threshold parameter For any key area of ​​a foot node, if the displacement of any key area of ​​a foot node is greater than or equal to the deformation threshold parameter , any one of the foot node key areas is recorded as the deformation foot node key area.

[0016] Preferably, the force uniformity of each key area of ​​the deformed foot node is obtained by analyzing the similarity of the changes in the edge position of the key contour area in the grayscale image of the key area of ​​the deformed foot node in different frames, including the specific method of:

[0017] For any frame of grayscale image of the key region of the deformed foot node, obtain the contour coordinate column vector of the key contour region in the grayscale image of the key region of the deformed foot node of the arbitrary frame;

[0018] The first The contour coordinate column vector of the key contour area in the grayscale image of the key area of ​​the frame shape change foot node is The cosine similarity between the contour coordinate column vectors of the key contour area in the grayscale image of the key area of ​​the frame shape change node is recorded as The contour similarity of the key contour area in the grayscale image of the key area of ​​the frame deformation foot node; the normalized value of the cumulative sum of the contour similarities of the key contour area in the grayscale image of the key area of ​​the deformation foot node of all frames is used as the force uniformity of the key area of ​​the deformation foot node.

[0019] Preferably, the specific method of obtaining the contour coordinate column vector of the key contour area in the grayscale image of the key area of ​​the deformed foot node of any frame includes:

[0020] The vector formed by the coordinate positions of all edge pixel points of the key contour area in the grayscale image of the key area of ​​the shape-changing foot node of any frame is used as the contour coordinate column vector of the key contour area in the grayscale image of the key area of ​​the shape-changing foot node of any frame.

[0021] Preferably, the method of screening the key areas of the deformed foot nodes according to the force uniformity of the key areas of the deformed foot nodes to obtain all the key areas of the foot nodes to be corrected includes the following specific methods:

[0022] Preset a correction threshold parameter For any key area of ​​a deformed foot node, if the force uniformity of any key area of ​​a deformed foot node is less than the correction threshold parameter , any one of the deformed foot node key areas is recorded as the foot node key area to be corrected.

[0023] Preferably, the method of obtaining the update vector angle of the key area of ​​the foot node to be corrected according to the geometric center position of the key contour area in the grayscale image of the key area of ​​the foot node to be corrected in the last frame includes the following specific methods:

[0024] The straight line connecting the position coordinates of the geometric center of the key contour area in the grayscale image of the key area of ​​the foot node to be corrected in the last frame and the position coordinates of the geometric center of the key contour area in the grayscale image of the key area of ​​the foot node to be corrected in the first frame is recorded as the first straight line; the acute angle formed between the first straight line and the horizontal line is used as the update vector angle of the key area of ​​the foot node to be corrected.

[0025] Preferably, the stress of the column foot node of the steel tube concrete column is evaluated based on the stress vector integration result, and the specific method includes:

[0026] Input the stress vector integration results of all key areas of the foot nodes to be corrected and the stress vector integration results of all other key areas of the foot nodes into the finite element analysis method to obtain the load capacity of the foot node of the steel tube concrete column;

[0027] Preset a load threshold parameter , if the ratio between the load of the steel tube concrete column foot node and its maximum load is greater than or equal to the load threshold parameter , the stress assessment results of the column base nodes of the steel tube concrete columns are recorded as qualified.

[0028] The beneficial effects of the technical solution of the present invention are as follows: the present invention screens all the key areas of the foot nodes according to the displacement of the key areas of the foot nodes to obtain all the key areas of the deformed foot nodes; screens the key areas of the deformed foot nodes according to the force uniformity of the key areas of the deformed foot nodes to obtain all the key areas of the foot nodes to be corrected; uses the updated vector angle and stress bearing capacity of each key area of ​​the foot nodes to be corrected as the stress vector integration result of each key area of ​​the foot nodes to be corrected; evaluates the stress of the column foot node of the steel tube concrete column based on the stress vector integration result; thereby avoiding the problem that some key areas of the foot nodes are deformed due to being loaded, resulting in inaccurate stress direction of the final obtained stress, thereby improving the accuracy of the stress evaluation results of the column foot node of the steel tube concrete column. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A flowchart of the steps of the method for evaluating the stress of the column foot node of a steel tube concrete column for waste incineration power generation according to the present invention;

[0031] Figure 2 The present invention is a flow chart of characteristic relationships of a method for evaluating stress at a column base node of a steel tube concrete column for waste incineration power generation. DETAILED DESCRIPTION

[0032] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of the stress assessment method of the column foot node of the steel tube concrete column for waste incineration power generation proposed by the present invention, in combination with the accompanying drawings and preferred embodiments, as well as its specific implementation method, structure, characteristics and effects. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0033] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0034] The specific scheme of the stress assessment method for the column base node of a steel tube concrete column for waste incineration power generation provided by the present invention is described in detail below with reference to the accompanying drawings.

[0035] See also Figure 1 , which shows a flowchart of the steps of a method for evaluating the stress of a column foot node of a steel tube concrete column for waste incineration power generation provided by an embodiment of the present invention, the method comprising the following steps:

[0036] Step S001: Obtain video images of several key areas of the foot node in the foot node area of ​​the steel tube concrete column, and the stress tolerance of each key area of ​​the foot node.

[0037] Specifically, it is necessary to first collect video images of several key areas of the foot node in the foot node area of ​​the steel tube concrete column, as well as the stress bearing capacity of each key area of ​​the foot node. The specific process is as follows:

[0038] Relevant staff marked the inner wall of the steel tube, the weld area and the concrete edge in the foot node area of ​​the steel tube concrete column, and recorded them as key areas of the foot node.

[0039] When conducting a waste incineration power generation loading experiment in the foot node area of ​​a concrete column, an industrial camera is used to continuously shoot the key area of ​​each foot node to obtain a video image of the key area of ​​each foot node; stress sheets are arranged in the key area of ​​each foot node to obtain the stress bearing capacity of the key area of ​​each foot node.

[0040] So far, the video images of several key areas of the foot node in the foot node area of ​​the steel tube concrete column and the stress bearing capacity of each key area of ​​the foot node are obtained through the above method.

[0041] Step S002: Divide the video image of the key area of ​​the foot node into several frames of grayscale images of the key area of ​​the foot node; obtain the key contour area in the grayscale image of the key area of ​​the foot node in each frame; obtain the displacement of the key area of ​​the foot node by analyzing the changes in the geometric center position of the key contour area in the grayscale images of the key area of ​​the foot node in different frames; screen all the key areas of the foot node according to the displacement of the key area of ​​the foot node to obtain all the deformed key areas of the foot node; obtain the force uniformity of each deformed key area of ​​the foot node by analyzing the similarity of the changes in the edge position of the key contour area in the grayscale images of the key area of ​​the deformed foot node in different frames; screen the deformed key areas of the foot node according to the force uniformity of the key areas of the deformed foot node to obtain all the key areas of the foot node to be corrected; obtain the update vector angle of the key area of ​​the foot node to be corrected according to the geometric center position of the key contour area in the grayscale image of the key area of ​​the foot node to be corrected in the last frame; use the update vector angle and stress bearing amount of each key area of ​​the foot node to be corrected as the stress vector integration result of each key area of ​​the foot node to be corrected.

[0042] It should be noted that in the use scenario of the column foot node of the steel tube concrete column in waste incineration power generation, the key area of ​​the foot node in the column foot node area of ​​the steel tube concrete column will have a certain degree of deformation. Such deformation will cause the stress direction to deviate, and then cause errors in the vector results. In order to eliminate the errors caused by measuring the stress evaluation indicators during measurement or actual use, the actual deformation results are identified and analyzed, and the stress vector value is compensated based on the results to obtain the error-free stress vector integration results of the key area of ​​each foot node. According to the error-free stress vector integration results, the final stress evaluation results of the column foot node of the steel tube concrete column are obtained.

[0043] Specifically, this embodiment is described by taking any key area of ​​a foot node as an example.

[0044] Preferably, in some implementations of the embodiments of the present invention, the specific method of dividing the video image of the foot node key area into a plurality of frame foot node key area grayscale images is:

[0045] The video image of the foot node key area is divided into a plurality of frame foot node key area images by using a frame rate-based extraction method; each frame foot node key area image is subjected to a median filter denoising and grayscale operation to obtain a foot node key area grayscale image of each frame. Among them, the median filter, grayscale operation and frame rate-based extraction method are all prior arts, and will not be described in detail in this embodiment.

[0046] Preferably, in some implementations of the embodiments of the present invention, the specific method for obtaining the key contour area in the grayscale image of the key area of ​​the foot node of each frame is:

[0047] For the grayscale image of the key area of ​​the foot node of any frame, the Canny edge detection algorithm is used to obtain all edge pixel points in the grayscale image of the key area of ​​the foot node of any frame; the closed area formed by all edge pixel points is used as the key contour area in the grayscale image of the key area of ​​the foot node of any frame.

[0048] Preferably, in some implementations of the embodiments of the present invention, since the difference between the geometric center position and the initial position of the key contour area in the grayscale images of the key area of ​​the foot node in different frames is higher, it means that the overall displacement of the key area of ​​the foot node is higher, and the corresponding possibility of deformation of the key area of ​​the foot node during the loading test is higher, so by analyzing the change of the geometric center position of the key contour area in the grayscale images of the key area of ​​the foot node in different frames, the specific method for obtaining the displacement of the key area of ​​the foot node is:

[0049] For any frame foot node key area grayscale image other than the first frame foot node key area grayscale image, the absolute value of the difference between the horizontal coordinate of the geometric center position of the key contour area in the any frame foot node key area grayscale image and the horizontal coordinate of the geometric center position of the key contour area in the first frame foot node key area grayscale image is recorded as the horizontal coordinate difference value of the key contour area in the any frame foot node key area grayscale image; the vertical coordinate of the geometric center position of the key contour area in the any frame foot node key area grayscale image and the vertical coordinate of the geometric center position of the key contour area in the first frame foot node key area grayscale image are recorded as the horizontal coordinate difference value of the key contour area in the any frame foot node key area grayscale image. The absolute value of the difference between the ordinates of the geometric center positions of the key contour area is recorded as the ordinate difference value of the key contour area in the grayscale image of the key contour area of ​​any frame foot node; the sum of the ordinate difference value and the abscissa difference value of the key contour area in the grayscale image of the key contour area of ​​any frame foot node is recorded as the displacement difference value of the key contour area in the grayscale image of the key contour area of ​​any frame foot node; the normalized value of the mean of the displacement difference values ​​of the key contour area in the grayscale images of the key contour areas of all frames foot node except the grayscale image of the key contour area of ​​the first frame foot node is taken as the displacement property of the key contour area of ​​the foot node;

[0050] The specific formula is:

[0051]

[0052] In the formula, Indicates the displacement of the key area of ​​the foot node; represents the number of grayscale images of the key areas of all frame foot nodes except the grayscale image of the key area of ​​the first frame foot node; The horizontal coordinate representing the geometric center position of the key contour area in the grayscale image of the key area of ​​the foot node of the first frame; Indicates The horizontal coordinate of the geometric center position of the key contour area in the grayscale image of the frame foot node key area; The ordinate represents the geometric center position of the key contour area in the grayscale image of the key area of ​​the foot node of the first frame; Indicates The ordinate of the geometric center position of the key contour area in the grayscale image of the key area of ​​the frame foot node; Indicates taking the absolute value; represents the linear normalization function.

[0053] It should be noted that when the displacement of the key area of ​​the foot node is closer to 0, it indicates that the possibility of deformation displacement of the key area of ​​the foot node due to the loading test is smaller; on the contrary, when the displacement of the key area of ​​the foot node is higher, it is necessary to further analyze its force uniformity and offset direction, and then determine the compensation value of its angle vector and correct it.

[0054] Preferably, in some implementations of the embodiments of the present invention, all the key areas of the foot nodes are screened according to the displacement of the key areas of the foot nodes, and the specific method for obtaining all the deformed key areas of the foot nodes is:

[0055] Preset a deformation threshold parameter , wherein this embodiment is based on This example is described as an example, and this embodiment is not specifically limited. Depends on the specific implementation situation;

[0056] For any key area of ​​a foot node, if the displacement of any key area of ​​a foot node is greater than or equal to the deformation threshold parameter , any one of the foot node key areas is recorded as the deformation foot node key area.

[0057] It should be noted that, in general, the force analysis of the key area of ​​the foot node without the correction link only obtains the force direction through the geometric characteristics of the key area of ​​the foot node, and does not include the force direction caused by deformation, that is, the displacement direction of the key area of ​​the foot node. However, the force direction obtained by this method has errors and is inaccurate. By analyzing the direction of displacement of the key contour area of ​​the key area of ​​the foot node and the overall deformation, the force direction value in the key area of ​​the foot node can be determined; and the force direction value is the accurate result of the angle vector, and the stress compensation processing of the key area of ​​the foot node is performed based on this value.

[0058] Preferably, in some implementations of the embodiments of the present invention, the more irregular the contour deformation of the key contour area of ​​the key area of ​​the foot node, the more uneven the force is, that is, the greater the degree of change in the magnitude and direction of the force; therefore, by analyzing the similarity of the changes in the edge position of the key contour area in the grayscale images of the key area of ​​the foot node in different frames, the specific method for obtaining the force uniformity of each deformed foot node key area is:

[0059] This embodiment is described by taking any key area of ​​a deformed foot node as an example;

[0060] For a grayscale image of a key region of a deformed foot node in any frame, a vector formed by the coordinate positions of all edge pixels of a key contour region in the grayscale image of the key region of a deformed foot node in any frame is used as a contour coordinate column vector of the key contour region in the grayscale image of the key region of a deformed foot node in any frame;

[0061] The first The contour coordinate column vector of the key contour area in the grayscale image of the key area of ​​the frame shape change foot node is The cosine similarity between the contour coordinate column vectors of the key contour area in the grayscale image of the key area of ​​the frame shape change node is recorded as The contour similarity of the key contour area in the grayscale image of the key area of ​​the frame deformation foot node; the normalized value of the cumulative sum of the contour similarities of the key contour area in the grayscale image of the key area of ​​the deformation foot node of all frames is used as the force uniformity of the key area of ​​the deformation foot node;

[0062] The specific formula is:

[0063]

[0064] In the formula, Indicates the force uniformity of the key area of ​​the deformation foot node; The number of grayscale images representing the key regions of all frame shape change nodes; Indicates The contour coordinate column vector of the key contour area in the grayscale image of the key area of ​​the frame shape change foot node is The cosine similarity between the contour coordinate column vectors of the key contour area in the grayscale image of the key area of ​​the frame shape change foot node; represents the linear normalization function.

[0065] It should be noted that the closer the contour similarity of the key area of ​​the deformation foot node between two adjacent frames is to 1, the closer the deformation degree of the key contour area in the key area of ​​the deformation foot node is, and the higher the force uniformity of the key area of ​​the deformation foot node is, which means that the contour of the key area of ​​the deformation foot node is only displaced due to the loading experiment, and no large irreversible deformation is generated.

[0066] Preferably, in some implementations of the embodiments of the present invention, when the force uniformity of the key area of ​​the deformed foot node is small, it is because the loading test load is too large, resulting in a certain degree of irreversible deformation of the key area of ​​the deformed foot node; therefore, the key area of ​​the deformed foot node is screened according to the force uniformity of the key area of ​​the deformed foot node, and the specific method for obtaining all the key areas of the foot node to be corrected is:

[0067] Preset a correction threshold parameter , wherein this embodiment is based on This example is described as an example, and this embodiment is not specifically limited. Depends on the specific implementation situation;

[0068] For any key area of ​​a deformed foot node, if the force uniformity of any key area of ​​a deformed foot node is less than the correction threshold parameter , any one of the deformed foot node key areas is recorded as the foot node key area to be corrected.

[0069] Preferably, in some implementations of the embodiments of the present invention, when the stress of the key area of ​​the foot node to be corrected is uneven, its specific stress direction is the main direction of the key contour area after geometric splitting; therefore, according to the geometric center position of the key contour area in the grayscale image of the key area of ​​the foot node to be corrected in the last frame, the specific method for obtaining the update vector angle of the key area of ​​the foot node to be corrected is:

[0070] This embodiment is described by taking any key area of ​​a foot node to be corrected as an example;

[0071] The straight line connecting the position coordinates of the geometric center of the key contour area in the grayscale image of the key area of ​​the foot node to be corrected in the last frame and the position coordinates of the geometric center of the key contour area in the grayscale image of the key area of ​​the foot node to be corrected in the first frame is recorded as the first straight line; the acute angle formed between the first straight line and the horizontal line is used as the update vector angle of the key area of ​​the foot node to be corrected.

[0072] It should be noted that the updated vector angle is used as the stress vector direction of the key area of ​​the foot node to be corrected, which eliminates the influence of the direction change caused by the deformation displacement of the key area of ​​the foot node to be corrected during the loading test, and improves the accuracy of the stress vector result.

[0073] Preferably, in some implementations of the embodiments of the present invention, the update vector angle and stress tolerance of each key area of ​​the foot node to be corrected are used as the stress vector integration result of each key area of ​​the foot node to be corrected;

[0074] At this point, the stress vector integration results of the key areas of each foot node to be corrected are obtained through the above method.

[0075] Step S003: Evaluate the stress of the steel tube concrete column base node based on the stress vector integration result.

[0076] Preferably, in some implementations of the embodiments of the present invention, the specific method for evaluating the stress of the column foot node of the steel tube concrete column based on the stress vector integration result is:

[0077] Input the stress vector integration results of all key areas of the foot nodes to be corrected and the stress vector integration results of all other key areas of the foot nodes into the finite element analysis method to obtain the load capacity of the foot node of the steel tube concrete column;

[0078] It should be noted that the stress vector integration results used for the key areas of the foot nodes other than the key areas of the foot nodes to be corrected are the initial stress vector integration results; the finite element analysis method is a prior art and will not be described in detail in this embodiment.

[0079] Preset a load threshold parameter , wherein this embodiment is based on This example is described as an example, and this embodiment is not specifically limited. Depends on the specific implementation situation;

[0080] If the ratio between the load of the steel tube concrete column foot node and its maximum load is greater than or equal to the load threshold parameter , the stress assessment results of the column base nodes of the steel tube concrete columns are recorded as qualified.

[0081] At this point, this embodiment is complete; please refer to Figure 2 , which shows a characteristic relationship flow chart of a stress assessment method for a column base node of a concrete-filled steel tube column used for waste incineration power generation.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A stress assessment method for the column foot nodes of a steel tube concrete column for waste incineration power generation, characterized in that: The method comprises the following steps: Obtain video images of several key areas of foot nodes in the foot node area of ​​the steel tube concrete column, and the stress bearing capacity of each key area of ​​the foot node; Divide the video image of the key area of ​​the foot node into several frames of grayscale images of the key area of ​​the foot node; obtain the key contour area in the grayscale image of the key area of ​​the foot node in each frame; obtain the displacement of the key area of ​​the foot node by analyzing the changes in the geometric center position of the key contour area in the grayscale images of the key area of ​​the foot node in different frames; screen all the key areas of the foot node according to the displacement of the key area of ​​the foot node to obtain all the deformed key areas of the foot node; obtain the force uniformity of each deformed key area of ​​the foot node by analyzing the similarity of the changes in the edge position of the key contour area in the grayscale images of the key areas of the deformed foot nodes in different frames; screen the deformed key areas of the foot node according to the force uniformity of the key areas of the deformed foot nodes to obtain all the key areas of the foot nodes to be corrected; obtain the update vector angle of the key area of ​​the foot node to be corrected according to the geometric center position of the key contour area in the grayscale image of the key area of ​​the foot node to be corrected in the last frame; use the update vector angle and stress tolerance of each key area of ​​the foot node to be corrected as the stress vector integration result of each key area of ​​the foot node to be corrected; The stress at the base node of the steel tube concrete column is evaluated based on the stress vector integration results.

2. The stress assessment method for the column base node of a steel tube concrete column for waste incineration power generation according to claim 1 is characterized in that: The specific method of dividing the video image of the foot node key area into a plurality of frame foot node key area grayscale images includes: The video image of the foot node key area is divided into several frame foot node key area images by using the frame rate-based extraction method; The key area image of the foot node of each frame is subjected to median filtering denoising and grayscale operation to obtain the key area grayscale image of the foot node of each frame.

3. The stress assessment method for the column base node of a steel tube concrete column for waste incineration power generation according to claim 1 is characterized in that: The specific method of obtaining the key contour area in the grayscale image of the key area of ​​the foot node of each frame includes: For the grayscale image of the key area of ​​the foot node of any frame, the Canny edge detection algorithm is used to obtain all edge pixel points in the grayscale image of the key area of ​​the foot node of any frame; the closed area formed by all edge pixel points is used as the key contour area in the grayscale image of the key area of ​​the foot node of any frame.

4. The stress assessment method for the column base node of a steel tube concrete column for waste incineration power generation according to claim 1 is characterized in that: The displacement of the key area of ​​the foot node is obtained by analyzing the change of the geometric center position of the key contour area in the grayscale image of the key area of ​​the foot node in different frames, and the specific method includes: For any frame foot node key area grayscale image other than the first frame foot node key area grayscale image, the absolute value of the difference between the horizontal coordinate of the geometric center position of the key contour area in the any frame foot node key area grayscale image and the horizontal coordinate of the geometric center position of the key contour area in the first frame foot node key area grayscale image is recorded as the horizontal coordinate difference value of the key contour area in the any frame foot node key area grayscale image; The absolute value of the difference between the ordinate of the geometric center position of the key contour area in the grayscale image of the key area of ​​the foot node of any frame and the ordinate of the geometric center position of the key contour area in the grayscale image of the key area of ​​the foot node of the first frame is recorded as the ordinate difference value of the key contour area in the grayscale image of the key area of ​​the foot node of any frame; The sum of the ordinate difference value and the abscissa difference value of the key contour area in the grayscale image of the key area of ​​the foot node of any frame is recorded as the displacement difference value of the key contour area in the grayscale image of the key area of ​​the foot node of any frame; The normalized value of the mean of the displacement difference values ​​of the key contour area in the grayscale images of the key area of ​​the foot node of all frames except the grayscale image of the key area of ​​the foot node of the first frame is taken as the displacement of the key area of ​​the foot node.

5. The stress assessment method for the column base node of a steel tube concrete column for waste incineration power generation according to claim 1 is characterized in that: The method of screening all the key areas of the foot nodes according to the displacement of the key areas of the foot nodes to obtain all the key areas of the deformed foot nodes includes: Preset a deformation threshold parameter For any key area of ​​a foot node, if the displacement of any key area of ​​a foot node is greater than or equal to the deformation threshold parameter , any one of the foot node key areas is recorded as the deformation foot node key area.

6. The stress assessment method for the column base node of a steel tube concrete column for waste incineration power generation according to claim 1 is characterized in that: The force uniformity of each key area of ​​the deformed foot node is obtained by analyzing the similarity of the edge position changes of the key contour area in the grayscale images of the key areas of the deformed foot nodes in different frames, including the specific method of: For any frame of grayscale image of the key region of the deformed foot node, obtain the contour coordinate column vector of the key contour region in the grayscale image of the key region of the deformed foot node of the arbitrary frame; The first The contour coordinate column vector of the key contour area in the grayscale image of the key area of ​​the frame shape change foot node is The cosine similarity between the contour coordinate column vectors of the key contour area in the grayscale image of the key area of ​​the frame shape change node is denoted as Contour similarity of key contour areas in grayscale images of key areas of frame shape change nodes; The normalized value of the cumulative sum of contour similarities of the key contour area in the grayscale images of the key area of ​​the deformable foot node in all frames is used as the force uniformity of the key area of ​​the deformable foot node.

7. The stress assessment method for the column base node of a steel tube concrete column for waste incineration power generation according to claim 6 is characterized in that: The specific method of obtaining the contour coordinate column vector of the key contour area in the grayscale image of the key area of ​​the deformed foot node of any frame includes: The vector formed by the coordinate positions of all edge pixel points of the key contour area in the grayscale image of the key area of ​​the shape-changing foot node of any frame is used as the contour coordinate column vector of the key contour area in the grayscale image of the key area of ​​the shape-changing foot node of any frame.

8. The stress assessment method for the column base node of a steel tube concrete column for waste incineration power generation according to claim 1 is characterized in that: The method of screening the key areas of the deformed foot nodes according to the force uniformity of the key areas of the deformed foot nodes to obtain all the key areas of the foot nodes to be corrected includes: Preset a correction threshold parameter For any key area of ​​a deformed foot node, if the force uniformity of any key area of ​​a deformed foot node is less than the correction threshold parameter , any one of the deformed foot node key areas is recorded as the foot node key area to be corrected.

9. The stress assessment method for the column base node of a steel tube concrete column for waste incineration power generation according to claim 1 is characterized in that: The method of obtaining the update vector angle of the key area of ​​the foot node to be corrected according to the geometric center position of the key contour area in the grayscale image of the key area of ​​the foot node to be corrected in the last frame includes: Connect the position coordinates of the geometric center of the key contour area in the grayscale image of the key area of ​​the foot node to be corrected in the last frame with the position coordinates of the geometric center of the key contour area in the grayscale image of the key area of ​​the foot node to be corrected in the first frame, and record it as the first straight line; The acute angle formed between the first straight line and the horizontal line is used as the update vector angle of the key area of ​​the foot node to be corrected.

10. The stress assessment method for the column base node of a steel tube concrete column for waste incineration power generation according to claim 1 is characterized in that: The specific method for evaluating the stress of the column foot node of the steel tube concrete column based on the stress vector integration result is as follows: Input the stress vector integration results of all key areas of the foot nodes to be corrected and the stress vector integration results of all other key areas of the foot nodes into the finite element analysis method to obtain the load capacity of the foot node of the steel tube concrete column; Preset a load threshold parameter , if the ratio between the load of the steel tube concrete column foot node and its maximum load is greater than or equal to the load threshold parameter , the stress assessment results of the column base nodes of the steel tube concrete columns are recorded as qualified.

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