Elbow supporting column connection stability evaluation method

Abstract

The invention discloses a bend pipe support column connection stability evaluation method, and belongs to the field of building structure data analysis, and the method comprises the steps: building a three-dimensional finite element model, carrying out finite element mechanical analysis, applying a dynamic load, and determining a sub-monitoring region on a bend pipe support column; combining the adjacent sub-monitoring areas, and determining a deformation monitoring area on the surface of the bent pipe supporting column; after the bent pipe supporting columns are connected and installed, a deformation monitoring sensor and a vibration sensor are installed, and deformation data of a deformation monitoring area and vibration data of the two ends of the connecting position between the bent pipe supporting columns are collected; and comprehensively evaluating the connection stability of the elbow support column by combining the deformation following coefficient and the discrete coefficient related to vibration. According to the invention, the deformation monitoring area can be accurately determined at the initial stage of design and installation of the elbow support column, and the stability of the connection position can be effectively monitored and analyzed at the later stage of use of the elbow support column.

Description

Technical Field

[0001] The invention relates to the field of building structure data analysis, and in particular to a method for evaluating the connection stability of a bent pipe support column. Background Art

[0002] In many fields such as construction, machinery, and chemical industry, elbow support columns are widely used as key load-bearing components, such as the support structure of the exterior decorative curtain wall of high-rise buildings and the hanger components of large industrial pipeline transportation systems. However, as a support member, the elbow support column is difficult to construct due to its complex structure. It often requires multiple sections to be spliced, and it is necessary to build specific connection components between the elbow support columns, such as welding and riveting. However, after the construction and installation of the elbow support column, the stability detection and evaluation of its connection has become a difficult point. The existing technology has many defects in the judgment and decision-making means of the connection stability of the elbow support column: on the one hand, the traditional method is often based on simple empirical formulas or rough mechanical approximate calculations, ignoring the unique geometric nonlinear characteristics and mechanical characteristics of the elbow, and the selection of some key deformation areas often relies on human experience judgment, which lacks rationality; on the other hand, it often relies on only a single data for stability evaluation, which makes it impossible to accurately and reasonably predict whether the connection part will have instability risks when facing complex structures and harsh working conditions, which brings great uncertainty to engineering safety. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the present invention provides a method for evaluating the stability of a bent pipe support column connection, which reasonably determines the deformation monitoring area based on finite element mechanics analysis, and comprehensively evaluates the stability of the bent pipe support column connection according to the vibration difference at both ends of the connection.

[0004] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is: A method for evaluating the connection stability of a bent pipe support column is provided, comprising: Step S1: establishing a three-dimensional finite element model according to the design size parameters of the curved pipe support column, performing finite element mechanical analysis, applying dynamic loads according to the dynamic connection load model, and determining the sub-monitoring area on the curved pipe support column according to the deformation data and load data of each area on the three-dimensional finite element model; Step S2: after all sub-monitoring areas on the curved pipe support column are determined, adjacent sub-monitoring areas are merged to form a merged monitoring area, and a deformation monitoring area on the surface of the curved pipe support column is determined; Step S3: After the bent pipe support column is connected and installed, a deformation monitoring sensor is installed at the installation point on the deformation monitoring area, and vibration sensors are installed at both ends of the connection position between the bent pipe support columns to collect deformation data of the deformation monitoring area and vibration data at both ends of the connection position between the bent pipe support columns; Step S4: Calculate the deformation following coefficient between the deformation monitoring areas during the deformation process according to the deformation data of the deformation monitoring area , calculate the discrete coefficients of the two ends of the inner connection position about the vibration direction according to the vibration data and the coefficient of dispersion with respect to the vibration amplitude ; Step S5: Combine deformation following coefficient , coefficient of dispersion and coefficient of dispersion Comprehensive assessment of the stability of bent pipe support column connections.

[0005] Further, step S1 includes: S11: Establish a three-dimensional finite element model based on the design size parameters of the bent pipe support column, divide the three-dimensional finite element model into several uniform sub-analysis blocks, and apply the target load that the bent pipe support column will bear during use after connection to the three-dimensional finite element model F 1; Step S12: Obtain the target load of each sub-analysis block F Deformation data under 1 condition and load data , n is the number of the sub-analysis block; Step S13: Based on the target load F 1 Apply dynamic connection loads to the 3D finite element model and record the deformation data set of each sub-analysis block during the dynamic connection load application process and the load data set , m is the number of data records, For subanalysis blocks n No. m Deformation data, For subanalysis blocks n No. m Load data, the dynamic connection load model is: ; in, k The number of GLL points discretized for each sub-analysis block, For the n The sub-analysis block is k The fluctuation function of the dynamic connection load corresponding to each GLL point, t k For the k The time for applying dynamic connection load to each GLL point, t is the time for applying the dynamic connection load, t 0 is the start time of applying dynamic connection load ，t1 is the end time of applying dynamic connection load, t n For subanalysis blocks n The time during which the dynamic connection load is applied, N is the number of sub-analysis blocks, For subanalysis blocks n Apply dynamic connection load fluctuations as a function of time, Apply dynamic connection load fluctuations as a function of time for discrete GLL points; Step S14: calculating the importance coefficient of each sub-analysis block on the stability of the bent pipe support column during the application of the dynamic connection load; ; in, Indicates taking the deformation data set The maximum value in Indicates the load data set The maximum value in Connection load thresholds designed for curved tube support columns, is the stiffness coefficient of the bent pipe support column, is the weight coefficient of deformation on the stability of the bent pipe support column, is the weight coefficient of the load on the stability of the bent pipe support column, and ; Step S15: Obtaining the importance coefficient data set of each sub-analysis block on the three-dimensional finite element model , set the importance coefficient threshold for screening sub-analysis blocks that need stability testing ; like , it is determined that the sub-analysis block is not stable enough during the use of the bent pipe support column connection, and the area where it is located is used as the sub-monitoring area during the use of the bent pipe support column connection; like , then the sub-analysis block is determined to be sufficiently stable during the use of the bent pipe support column connection.

[0006] Further, step S2 includes: Step S21: Obtain all sub-monitoring areas on the curved pipe support column to form a monitoring area data set, construct a three-dimensional coordinate system on the three-dimensional finite element model, obtain the coordinates of the center of each sub-monitoring area in the three-dimensional coordinate system, and calculate the distance between any two sub-monitoring areas; ; in, is the distance between the centers of any two different sub-monitoring areas, are the coordinates of the centers of any two different sub-monitoring areas, u ,v are the numbers of any two different sub-monitoring areas in the monitoring area dataset; Step S22: According to the size of the sub-analysis blocks divided on the three-dimensional finite element model l , according to the distance Screen two adjacent sub-monitoring areas; like , then determine the sub-monitoring area u With sub-monitoring area v as adjacent areas and sub-monitoring areas u With sub-monitoring area v merged into one sub-monitoring area; Otherwise, the sub-monitoring area is determined u With sub-monitoring area v If they are not adjacent, no merging will be performed; Step S23: traverse each sub-monitoring area in the monitoring area data set, merge adjacent sub-monitoring areas to form a merged monitoring area, and calculate the geometric center coordinates of the merged monitoring area ; ; in, I is the number of sub-monitoring areas contained in the combined monitoring area, i is the number of the sub-monitoring area contained in the merged monitoring area. Sub-monitoring area i The center coordinates of Step S24: Draw a vertical line passing through the geometric center coordinates and perpendicular to the outer surface of the merged monitoring area. The vertical point where the vertical line intersects the outer surface of the merged monitoring area is used as the installation point for deformation monitoring. The corresponding surface area of ​​the merged monitoring area on the bent pipe support column is used as the deformation monitoring area.

[0007] Further, step S3 includes: Step S31: After the bent pipe support column is connected and installed, a deformation monitoring sensor is installed at the installation point on the deformation monitoring area. The deformation monitoring sensor collects deformation data in the deformation monitoring area to form a deformation data set within the monitoring period. , is the number of data collections during the monitoring period, The first Deformation data; Step S32: Filter the maximum deformation data of each deformation monitoring area within the monitoring period , w is the number of the deformation monitoring area on the bent pipe support column, and the maximum deformation data set of each deformation monitoring area on the bent pipe support column is obtained ,W is the number of deformation monitoring areas on the bent pipe support column, For the W Maximum deformation data of each deformation monitoring area; Step S33: At the same time, vibration sensors are installed at both ends of the connection position between the curved pipe support columns to collect vibration data at both ends of the connection position during the monitoring period. The vibration data includes vibration amplitude and vibration direction to form a vibration amplitude data set. , and vibration direction dataset , ;in, The first The vibration amplitude, The first vibration direction.

[0008] Further, step S4 includes: Step S41: Using the maximum deformation data set The maximum value in Based on the corresponding deformation monitoring area, calculate the deformation following coefficient of the adjacent deformation monitoring area ; ; in, is the maximum deformation data of the deformation monitoring area adjacent to it, w 0 is the number of the adjacent deformation monitoring area. w 1 is the number of deformation monitoring areas adjacent to it, is the maximum value The corresponding geometric center coordinates of the deformation monitoring area, are the geometric center coordinates of the deformation monitoring area adjacent to it; Step S42: According to the vibration three-dimensional coordinate system, the vibration direction data is split into vibration direction components along the three axis directions of the vibration three-dimensional coordinate system. , , the vibration direction component is used to calculate the discrete coefficient of the vibration direction at both ends of the connection position during the monitoring period ; ; in, It is the number of times data is collected during the monitoring period. , Respectively The vibration direction component, is the ideal vibration direction offset; Step S43: Using the vibration amplitude data set , Calculate the dispersion coefficient of the vibration amplitude at both ends of the connection position during the monitoring period ; ; in, They are the first The vibration amplitude, is the ideal vibration amplitude.

[0009] Further, step S5 includes: Step S51: According to the deformation following coefficient , coefficient of dispersion and coefficient of dispersion Calculate the stability coefficient of the elbow support column connection during the monitoring period ; ; They are the weight coefficients of the influence of deformation influence range, dispersion degree of vibration direction and difference of vibration amplitude on the connection stability of bent pipe support column; Step S52: Setting the threshold of the stability coefficient , evaluate the stability of the elbow support column connection during the monitoring period; if , then the connection of the elbow support column is unstable during the monitoring period; if , the connection of the elbow support column is stable during the monitoring period.

[0010] The beneficial effects of the present invention are as follows: This solution establishes a three-dimensional finite element model of the bent pipe support column, performs finite element mechanical analysis on the bent pipe support column, and simulates the actual working conditions by applying dynamic connection loads, so as to reasonably and accurately obtain the area on the bent pipe support column that needs to be monitored for deformation, thereby effectively improving the accuracy of deformation monitoring. At the same time, by monitoring the vibration data at both ends of the connection part of the bent pipe support column, the vibration data within the monitoring period is processed and analyzed, and the vibration difference between the bent pipe support columns at both ends is used to evaluate the stability of the connection between the bent pipe support columns. The present invention can accurately determine the deformation monitoring area in the early stage of the design and installation of the bent pipe support column, and effectively monitor and analyze the stability of the connection position in the later stage of the use of the bent pipe support column, providing strong technical support for the engineering construction related to the bent pipe support column on the building structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Flowchart of the method for assessing the stability of bent-tube support-column connections. DETAILED DESCRIPTION

[0012] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0013] like Figure 1 As shown, a method for evaluating the stability of a bent pipe support column connection includes: Step S1: Establish a three-dimensional finite element model according to the design size parameters of the curved pipe support column, perform finite element mechanical analysis, apply dynamic loads according to the dynamic connection load model, and determine the sub-monitoring area on the curved pipe support column according to the deformation data and load data of each area on the three-dimensional finite element model. Step S1 specifically includes: S11: Establish a three-dimensional finite element model based on the design size parameters of the bent pipe support column, divide the three-dimensional finite element model into several uniform sub-analysis blocks, and divide the sub-analysis blocks according to the meshing method of finite element analysis, and apply the target load that the bent pipe support column will bear during use after connection to the three-dimensional finite element model F 1; Step S12: Obtain the target load of each sub-analysis block F Deformation data under 1 condition and load data , n is the number of the sub-analysis block; Step S13: Based on the target load F 1 Apply dynamic connection loads to the 3D finite element model and record the deformation data set of each sub-analysis block during the dynamic connection load application process and the load data set , m is the number of data records, For subanalysis blocks n No. m Deformation data, For subanalysis blocks n No. m Load data, the dynamic connection load model is: ; in, k The number of GLL points discretized for each sub-analysis block, For the n The sub-analysis block is k The fluctuation function of the dynamic connection load corresponding to each GLL point provides the fluctuation load data of the dynamic connection load fluctuating over time. tk For the k The time for applying dynamic connection load to each GLL point, t is the time for applying the dynamic connection load, t 0 is the start time of applying dynamic connection load ，t 1 is the end time of applying dynamic connection load, t n For subanalysis blocks n The time during which the dynamic connection load is applied, N is the number of sub-analysis blocks, For subanalysis blocks n Apply dynamic connection load fluctuations as a function of time, Apply dynamic connection load fluctuations as a function of time for discrete GLL points; Step S14: Calculate the importance coefficient of each sub-analysis block on the stability of the bent pipe support column during the dynamic connection load application process; the greater the deformation of the sub-analysis block during the finite element analysis process and the greater the load it bears, the greater the influence of the area on the stability of the bent pipe support column; ; in, Indicates taking the deformation data set The maximum value in Indicates the load data set The maximum value in Connection load thresholds designed for curved tube support columns, is the stiffness coefficient of the bent pipe support column, is the weight coefficient of deformation on the stability of the bent pipe support column, is the weight coefficient of the load on the stability of the bent pipe support column, and ; Step S15: Obtaining the importance coefficient data set of each sub-analysis block on the three-dimensional finite element model , set the importance coefficient threshold for screening sub-analysis blocks that need stability testing ; like , it is determined that the sub-analysis block is not stable enough during the use of the bent pipe support column connection, and the area where it is located is used as the sub-monitoring area during the use of the bent pipe support column connection; like , then the sub-analysis block is determined to be sufficiently stable during the use of the bent pipe support column connection.

[0014] Step S2: After all sub-monitoring areas on the curved pipe support column are determined, adjacent sub-monitoring areas are merged to form a merged monitoring area, and the deformation monitoring area on the surface of the curved pipe support column is determined. Step S2 specifically includes: Step S21: Obtain all sub-monitoring areas on the curved pipe support column to form a monitoring area data set, construct a three-dimensional coordinate system on the three-dimensional finite element model, obtain the coordinates of the center of each sub-monitoring area in the three-dimensional coordinate system, and calculate the distance between any two sub-monitoring areas; ; in, is the distance between the centers of any two different sub-monitoring areas, are the coordinates of the centers of any two different sub-monitoring areas, u , v are the numbers of any two different sub-monitoring areas in the monitoring area dataset; Step S22: According to the size of the sub-analysis blocks divided on the three-dimensional finite element model l , according to the distance Screen two adjacent sub-monitoring areas; like , then determine the sub-monitoring area u With sub-monitoring area v as adjacent areas and sub-monitoring areas u With sub-monitoring area v merged into one sub-monitoring area; Otherwise, the sub-monitoring area is determined u With sub-monitoring area v If they are not adjacent, no merging will be performed; Adjacent sub-monitoring areas are used as a deformation sensitive area and need to be merged to reduce the difficulty of deformation monitoring and the simplicity of stability assessment.

[0015] Step S23: traverse each sub-monitoring area in the monitoring area data set, merge adjacent sub-monitoring areas to form a merged monitoring area, and calculate the geometric center coordinates of the merged monitoring area ; ; in, I is the number of sub-monitoring areas contained in the combined monitoring area, i is the number of the sub-monitoring area contained in the merged monitoring area. Sub-monitoring area i The center coordinates of For curved pipe support columns, the monitoring area generally occurs in the curved surface area. Depending on the shape of the curved surface, the geometric center coordinates may be located outside or inside the curved surface. Therefore, when determining the installation point of deformation monitoring, it is necessary to draw a vertical line to determine it.

[0016] Step S24: Draw a vertical line passing through the geometric center coordinates and perpendicular to the outer surface of the merged monitoring area. The vertical point where the vertical line intersects the outer surface of the merged monitoring area is used as the installation point for deformation monitoring. The corresponding surface area of ​​the merged monitoring area on the bent pipe support column is used as the deformation monitoring area.

[0017] Step S3: After the elbow support column is connected and installed, a deformation monitoring sensor is installed at the installation point on the deformation monitoring area, and vibration sensors are installed at both ends of the connection position between the elbow support columns to collect deformation data of the deformation monitoring area and vibration data at both ends of the connection position between the elbow support columns. Step S3 specifically includes: Step S31: After the bent pipe support column is connected and installed, a deformation monitoring sensor is installed at the installation point on the deformation monitoring area. The deformation monitoring sensor collects deformation data in the deformation monitoring area to form a deformation data set within the monitoring period. , is the number of data collections during the monitoring period, The first Deformation data; Step S32: Filter the maximum deformation data of each deformation monitoring area within the monitoring period , w is the number of the deformation monitoring area on the bent pipe support column, and the maximum deformation data set of each deformation monitoring area on the bent pipe support column is obtained , W is the number of deformation monitoring areas on the bent pipe support column, For the W Maximum deformation data of each deformation monitoring area; Step S33: At the same time, vibration sensors are installed at both ends of the connection position between the curved pipe support columns to collect vibration data at both ends of the connection position during the monitoring period. The vibration data includes vibration amplitude and vibration direction to form a vibration amplitude data set. , and vibration direction dataset , ;in, The first The vibration amplitude, The first vibration direction.

[0018] Step S4: Calculate the deformation following coefficient between the deformation monitoring areas during the deformation process according to the deformation data of the deformation monitoring area , calculate the discrete coefficients of the two ends of the inner connection position about the vibration direction according to the vibration data and the coefficient of dispersion with respect to the vibration amplitude Step S4 specifically includes: Step S41: Using the maximum deformation data set The maximum value in Based on the corresponding deformation monitoring area, calculate the deformation following coefficient of the adjacent deformation monitoring area ; ; in, is the maximum deformation data of the deformation monitoring area adjacent to it, w 0 is the number of the adjacent deformation monitoring area. w 1 is the number of deformation monitoring areas adjacent to it, is the maximum value The corresponding geometric center coordinates of the deformation monitoring area, are the geometric center coordinates of the deformation monitoring area adjacent to it; The deformation of the structure generally occurs from the deformation monitoring area with the largest deformation, and will extend to the adjacent deformation monitoring area during the deformation process. Therefore, the influence of deformation on stability is evaluated by the degree of mutual influence between deformation monitoring areas. The size of the deformation following coefficient indicates the degree to which the surrounding deformation is affected by the maximum deformation point in the middle, that is, the degree of diffusion of the deformation.

[0019] Step S42: According to the vibration three-dimensional coordinate system, the vibration direction data is split into vibration direction components along the three axis directions of the vibration three-dimensional coordinate system. , The vibration direction component represents the angle between the vibration direction and the three axis directions after the vibration direction is projected onto the three axis directions of the vibration three-dimensional coordinate system. The vibration direction component is used to calculate the discrete coefficients of the two ends of the connection position with respect to the vibration direction during the monitoring period. ; ; in, It is the number of times data is collected during the monitoring period. , Respectively The vibration direction component, is the ideal vibration direction offset; Step S43: Using the vibration amplitude data set , Calculate the dispersion coefficient of the vibration amplitude at both ends of the connection position during the monitoring period ; ; in, They are the first The vibration amplitude, is the ideal vibration amplitude.

[0020] Coefficient of dispersion in vibration direction Indicates the dispersion degree of vibration in all directions, the dispersion coefficient The larger the value, the more complex the change of vibration direction; the discrete coefficient of vibration amplitude Indicates the dispersion of vibration amplitude, dispersion coefficient The larger it is, the more complex the variation in vibration amplitude will be.

[0021] The present invention discusses the influence of vibration on stability through the vibration difference at both ends of the connection part, and discusses the vibration direction difference of the vibration amplitude difference separately. For the connection part between the curved pipe support columns, the two ends must vibrate at the same time to ensure the stability of the connection part. If the vibration difference at the two ends at the same time is greater, this vibration difference will cause the connection part to separate faster. Regardless of the difference in vibration direction and vibration amplitude at the two ends, it will bring a test to the stability of the connection part.

[0022] Step S5: Combine deformation following coefficient , coefficient of dispersion and coefficient of dispersion Comprehensively evaluate the connection stability of the bent pipe support column. Step S5 specifically includes: Step S51: According to the deformation following coefficient , coefficient of dispersion and coefficient of dispersion Calculate the stability coefficient of the elbow support column connection during the monitoring period ; ; They are the weight coefficients of the influence of deformation influence range, dispersion degree of vibration direction and difference of vibration amplitude on the connection stability of bent pipe support column; Step S52: Setting the threshold of the stability coefficient , evaluate the stability of the elbow support column connection during the monitoring period; if , then the connection of the elbow support column is unstable during the monitoring period; if , the connection of the elbow support column is stable during the monitoring period.

[0023] The present invention establishes a three-dimensional finite element model of the bent pipe support column, performs finite element mechanical analysis on the bent pipe support column, and simulates the actual working conditions by applying dynamic connection loads, so as to reasonably and accurately obtain the area on the bent pipe support column that needs to be monitored for deformation, thereby effectively improving the accuracy of deformation monitoring. At the same time, by monitoring the vibration data at both ends of the connection part of the bent pipe support column, the vibration data within the monitoring period is processed and analyzed, and the vibration difference between the bent pipe support columns at both ends is used to evaluate the stability of the connection between the bent pipe support columns. The present invention can accurately determine the deformation monitoring area in the early stage of the design and installation of the bent pipe support column, and effectively monitor and analyze the stability of the connection position in the later stage of the use of the bent pipe support column, providing a strong technical guarantee for the engineering construction related to the bent pipe support column on the building structure.

Claims

1. A method for evaluating the connection stability of a curved pipe support column, characterized in that: include: Step S1: establishing a three-dimensional finite element model according to the design size parameters of the curved pipe support column, performing finite element mechanical analysis, applying dynamic loads according to the dynamic connection load model, and determining the sub-monitoring area on the curved pipe support column according to the deformation data and load data of each area on the three-dimensional finite element model; Step S2: after all sub-monitoring areas on the curved pipe support column are determined, adjacent sub-monitoring areas are merged to form a merged monitoring area, and a deformation monitoring area on the surface of the curved pipe support column is determined; Step S3: After the bent pipe support column is connected and installed, a deformation monitoring sensor is installed at the installation point on the deformation monitoring area, and vibration sensors are installed at both ends of the connection position between the bent pipe support columns to collect deformation data of the deformation monitoring area and vibration data at both ends of the connection position between the bent pipe support columns; Step S4: Calculate the deformation following coefficient between the deformation monitoring areas during the deformation process according to the deformation data of the deformation monitoring area , calculate the discrete coefficients of the two ends of the inner connection position about the vibration direction according to the vibration data and the coefficient of dispersion with respect to the vibration amplitude ; Step S5: Combine deformation following coefficient , coefficient of dispersion and coefficient of dispersion Comprehensive assessment of the stability of bent pipe support column connections.

2. The method for evaluating the connection stability of a bent pipe support column according to claim 1, characterized in that: The step S1 comprises: S11: Establish a three-dimensional finite element model based on the design size parameters of the bent pipe support column, divide the three-dimensional finite element model into several uniform sub-analysis blocks, and apply the target load that the bent pipe support column will bear during use after connection to the three-dimensional finite element model F 1; Step S12: Obtain the target load of each sub-analysis block F Deformation data under 1 condition And the load data , n is the number of the sub-analysis block; Step S13: Based on the target load F 1 Apply dynamic connection loads to the 3D finite element model and record the deformation data set of each sub-analysis block during the dynamic connection load application process and the load data set , m is the number of data records, For subanalysis blocks n No. m Deformation data, For subanalysis blocks n No. m Load data, the dynamic connection load model is: ； in, k The number of GLL points discretized for each sub-analysis block, For the n The sub-analysis block is k The fluctuation function of the dynamic connection load corresponding to each GLL point, t k For the k The time for applying dynamic connection load to each GLL point, t is the time for applying the dynamic connection load, t 0 is the start time of applying dynamic connection load ，t 1 is the end time of applying dynamic connection load, t n For subanalysis blocks n The time during which the dynamic connection load is applied, N is the number of sub-analysis blocks, For subanalysis blocks n Apply dynamic connection load fluctuations as a function of time, Apply dynamic connection load fluctuations as a function of time for discrete GLL points; Step S14: calculating the importance coefficient of each sub-analysis block on the stability of the bent pipe support column during the application of the dynamic connection load; ； in, Indicates taking the deformation data set The maximum value in Indicates the load data set The maximum value in Connection load thresholds designed for curved tube support columns, is the stiffness coefficient of the bent pipe support column, is the weight coefficient of deformation on the stability of the bent pipe support column, is the weight coefficient of the load on the stability of the bent pipe support column, and ; Step S15: Obtaining the importance coefficient data set of each sub-analysis block on the three-dimensional finite element model , set the importance coefficient threshold for screening sub-analysis blocks that need stability testing ; like , it is determined that the sub-analysis block is not stable enough during the use of the bent pipe support column connection, and the area where it is located is used as the sub-monitoring area during the use of the bent pipe support column connection; like , then the sub-analysis block is determined to be sufficiently stable during the use of the bent pipe support column connection.

3. The method for evaluating the connection stability of a bent pipe support column according to claim 2, characterized in that: The step S2 comprises: Step S21: Obtain all sub-monitoring areas on the curved pipe support column to form a monitoring area data set, construct a three-dimensional coordinate system on the three-dimensional finite element model, obtain the coordinates of the center of each sub-monitoring area in the three-dimensional coordinate system, and calculate the distance between any two sub-monitoring areas; ； in, is the distance between the centers of any two different sub-monitoring areas, are the coordinates of the centers of any two different sub-monitoring areas, u , v are the numbers of any two different sub-monitoring areas in the monitoring area dataset; Step S22: According to the size of the sub-analysis blocks divided on the three-dimensional finite element model l , according to the distance Screen two adjacent sub-monitoring areas; like , then determine the sub-monitoring area u With sub-monitoring area v as adjacent areas and sub-monitoring areas u With sub-monitoring area v merged into one sub-monitoring area; Otherwise, the sub-monitoring area is determined u With sub-monitoring area v If they are not adjacent, no merging will be performed; Step S23: traverse each sub-monitoring area in the monitoring area data set, merge adjacent sub-monitoring areas to form a merged monitoring area, and calculate the geometric center coordinates of the merged monitoring area ; ； in, I is the number of sub-monitoring areas contained in the combined monitoring area, i is the number of the sub-monitoring area contained in the merged monitoring area. Sub-monitoring area i The center coordinates of Step S24: Draw a vertical line passing through the geometric center coordinates and perpendicular to the outer surface of the merged monitoring area. The vertical point where the vertical line intersects the outer surface of the merged monitoring area is used as the installation point for deformation monitoring. The corresponding surface area of ​​the merged monitoring area on the bent pipe support column is used as the deformation monitoring area.

4. The method for evaluating the connection stability of a bent pipe support column according to claim 3, characterized in that: The step S3 comprises: Step S31: After the bent pipe support column is connected and installed, a deformation monitoring sensor is installed at the installation point on the deformation monitoring area. The deformation monitoring sensor collects deformation data in the deformation monitoring area to form a deformation data set within the monitoring period. , is the number of data collections during the monitoring period, The first Deformation data; Step S32: Filter the maximum deformation data of each deformation monitoring area within the monitoring period , w is the number of the deformation monitoring area on the bent pipe support column, and the maximum deformation data set of each deformation monitoring area on the bent pipe support column is obtained , W is the number of deformation monitoring areas on the bent pipe support column, For the W Maximum deformation data of each deformation monitoring area; Step S33: At the same time, vibration sensors are installed at both ends of the connection position between the curved pipe support columns to collect vibration data at both ends of the connection position during the monitoring period. The vibration data includes vibration amplitude and vibration direction to form a vibration amplitude data set. , and vibration direction dataset , ;in, The first The vibration amplitude, The first vibration direction.

5. The method for evaluating the connection stability of a bent pipe support column according to claim 4, characterized in that: The step S4 comprises: Step S41: Using the maximum deformation data set The maximum value in Based on the corresponding deformation monitoring area, calculate the deformation following coefficient of the adjacent deformation monitoring area ; ； in, is the maximum deformation data of the deformation monitoring area adjacent to it, w 0 is the number of the adjacent deformation monitoring area. w 1 is the number of deformation monitoring areas adjacent to it, is the maximum value The corresponding geometric center coordinates of the deformation monitoring area, are the geometric center coordinates of the deformation monitoring area adjacent to it; Step S42: According to the vibration three-dimensional coordinate system, the vibration direction data is split into vibration direction components along the three axis directions of the vibration three-dimensional coordinate system. , , the vibration direction component is used to calculate the discrete coefficient of the vibration direction at both ends of the connection position during the monitoring period ; ； in, It is the number of times data is collected during the monitoring period. , Respectively The vibration direction component, is the ideal vibration direction offset; Step S43: Using the vibration amplitude data set , Calculate the dispersion coefficient of the vibration amplitude at both ends of the connection position during the monitoring period ; ； in, They are the first The vibration amplitude, is the ideal vibration amplitude.

6. The method for evaluating the connection stability of a bent pipe support column according to claim 5, characterized in that: The step S5 comprises: Step S51: According to the deformation following coefficient , coefficient of dispersion and coefficient of dispersion Calculate the stability coefficient of the elbow support column connection during the monitoring period ; ; They are the weight coefficients of the influence of deformation influence range, dispersion degree of vibration direction and difference of vibration amplitude on the connection stability of bent pipe support column; Step S52: Setting the threshold of the stability coefficient , evaluate the stability of the elbow support column connection during the monitoring period; if , then the connection of the elbow support column is unstable during the monitoring period; if , the connection of the elbow support column is stable during the monitoring period.

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