A method for evaluating the connection stability of a bent pipe support column

Abstract

The present invention discloses a method for evaluating the connection stability of a bent pipe support column, belonging to the field of building structure data analysis, including: establishing a three-dimensional finite element model for finite element mechanical analysis, applying dynamic loads, and determining sub-monitoring areas on the bent pipe support column; merging between adjacent sub-monitoring areas and determining the deformation monitoring area on the surface of the bent pipe support column; after the connection of the bent pipe support column is installed, installing deformation monitoring sensors and vibration sensors 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; comprehensively evaluating the connection stability of the bent pipe support column by combining the deformation following coefficient and the discrete coefficient related to vibration. The present invention can accurately determine the deformation monitoring area at the initial 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.

Description

Technical Field

[0001] The present invention relates to the field of building structure data analysis, and particularly to a method for evaluating the connection stability of elbow support columns. Background Art

[0002] In many fields such as construction, machinery, and chemical industry, elbow support columns are widely used as key load-bearing components. For example, the external decorative curtain wall support structure of high-rise buildings, the hanger components of large industrial pipeline conveying systems, etc. However, as a support member, the elbow support column has a large construction difficulty due to the complexity of its structure. It often requires multiple sections to be spliced, and specific connection components need to be constructed between the elbow support columns, such as by welding, riveting, etc. However, after the construction and installation of the elbow support column are completed, the detection and evaluation of the connection stability have become a difficult point. There are many defects in the existing technical means for judging and making decisions on the connection stability of elbow support columns: on the one hand, traditional methods often only rely 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 regions often relies on human experience judgment, lacking rationality; on the other hand, the stability evaluation often only depends on a single data, which makes it impossible to accurately and reasonably predict whether there will be instability hidden dangers at the connection part when facing complex structures and harsh working conditions, bringing great uncertainty to engineering safety. Summary of the Invention

[0003] In view of the above deficiencies of the prior art, the present invention provides a method for evaluating the connection stability of elbow support columns, which reasonably determines the deformation monitoring area based on finite element mechanical analysis and comprehensively evaluates the connection stability of elbow support columns according to the vibration differences at both ends of the connection part.

[0004] To achieve the above invention purpose, the technical solution adopted by the present invention is as follows:

[0005] Provide a method for evaluating the connection stability of elbow support columns, which includes:

[0006] Step S1: Establish a three-dimensional finite element model according to the design dimension parameters of the elbow support column, conduct finite element mechanical analysis, apply dynamic loads according to the dynamic connection load model, and determine the sub-monitoring areas on the elbow support column according to the deformation data and load data of each area on the three-dimensional finite element model;

[0007] Step S2: After determining all the sub-monitoring areas on the elbow support column, merge the adjacent sub-monitoring areas to form a merged monitoring area, and determine the deformation monitoring area on the surface of the elbow support column;

[0008] Step S3: After the elbow support columns are connected and installed, install deformation monitoring sensors at the installation points in the deformation monitoring area, and install vibration sensors at both ends of the connection positions between the elbow support columns to collect the deformation data of the deformation monitoring area and the vibration data at both ends of the connection positions between the elbow support columns;

[0009] Step S4: Calculate the deformation following coefficient between the deformation monitoring areas during the deformation process based on the deformation data of the deformation monitoring area , calculate the discrete coefficient of both ends of the internal connection position with respect to the vibration direction based on the vibration data and the discrete coefficient with respect to the vibration amplitude ;

[0010] Step S5: Combine the deformation following coefficient , the discrete coefficient and the discrete coefficient to comprehensively evaluate the connection stability of the elbow support columns.

[0011] Furthermore, Step S1 includes:

[0012] S11: Establish a three-dimensional finite element model according to the design dimension parameters of the elbow support columns, divide the three-dimensional finite element model into several uniform sub-analysis blocks, and apply the target load borne during the use after the connection of the elbow support columns to the three-dimensional finite element model F 1 ;

[0013] Step S12: Obtain the deformation data F 1 under the condition of the target load and the load data borne by each sub-analysis block, n is the number of the sub-analysis block;

[0014] Step S13: Apply a dynamic connection load to the three-dimensional finite element model based on the target load F 1 , and record the deformation data set and the load data set borne by each sub-analysis block during the application of the dynamic connection load, m is the number of data records, is the n th deformation data of the sub-analysis block m , is the n th load data of the sub-analysis block m , and the dynamic connection load model is:

[0015] ;

[0016] ​Among them, k is the discrete number of GLL points for each sub - analysis block, is the n th sub - analysis block's fluctuation function of the dynamic connection load corresponding to the k th GLL point, t k is the time when the dynamic connection load is applied to the k th GLL point, t is the time when the dynamic connection load is applied, t 0 is the start time when the dynamic connection load is applied ，t 1 is the end time when the dynamic connection load is applied, t n is the time when the dynamic connection load is applied to the sub - analysis block n , N is the number of sub - analysis blocks, is the n th sub - analysis block's time function of the dynamic connection load fluctuation, is the time function of the dynamic connection load fluctuation applied to the discrete GLL points;

[0017] Step S14: Calculate the importance degree coefficient of the influence of each sub - analysis block on the stability of the elbow support column during the application of the dynamic connection load;

[0018] ;

[0019] Among them, represents taking the maximum value in the deformation data set , represents taking the maximum value in the load data set , is the connection load threshold for the design of the elbow support column, is the stiffness coefficient of the elbow support column, is the influence weight coefficient of deformation on the stability of the elbow support column, is the influence weight coefficient of load on the stability of the elbow support column, and ;

[0020] Step S15: Obtain the importance degree coefficient data set of each sub - analysis block on the three - dimensional finite - element model, , and set the importance degree coefficient threshold for screening the sub - analysis blocks that need to be subjected to stability detection ;

[0021] If , then it is determined that the sub - analysis block is not stable enough during the connection use of the elbow support column, and the area where it is located is used as the sub - monitoring area during the connection use of the elbow support column;

[0022] If , it is determined that the sub-analysis block is sufficiently stable during the use of the elbow support column connection.

[0023] Furthermore, step S2 includes:

[0024] Step S21: Obtain all sub-monitoring areas on the elbow support column to form a monitoring area data set. Construct a three-dimensional coordinate system on the three-dimensional finite element model, and obtain the coordinates of the center of each sub-monitoring area within the three-dimensional coordinate system, and calculate the distance between any two sub-monitoring areas;

[0025] ;

[0026] Among them, 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 within the monitoring area data set;

[0027] Step S22: According to the size of the sub-analysis block l divided on the three-dimensional finite element model, filter two adjacent sub-monitoring areas according to the distance ;

[0028] If , it is determined that the sub-monitoring area u and the sub-monitoring area v are adjacent areas, and the sub-monitoring area u and the sub-monitoring area v are merged into one sub-monitoring area;

[0029] Otherwise, it is determined that the sub-monitoring area u and the sub-monitoring area v are not adjacent and are not merged;

[0030] Step S23: Traverse each sub-monitoring area within the monitoring area data set, merge the adjacent sub-monitoring areas to form a merged monitoring area, and calculate the geometric center coordinates ;

[0031] ;

[0032] Among them, I is the number of sub-monitoring areas included in the merged monitoring area, i are the numbers of sub-monitoring areas included in the merged monitoring area, is the center coordinate of the sub-monitoring area i ;

[0033] Step S24: Draw a perpendicular line passing through the geometric center coordinates and perpendicular to the outer surface of the merged monitoring area. The perpendicular point where the perpendicular line intersects the outer surface of the merged monitoring area is used as the installation point for deformation monitoring, and the corresponding surface area of the merged monitoring area on the elbow support column is used as the deformation monitoring area.

[0034] Further, step S3 includes:

[0035] Step S31: After the elbow support column is connected and installed, install a deformation monitoring sensor at the installation point on the deformation monitoring area. The deformation monitoring sensor collects the deformation data within the deformation monitoring area to form a deformation data set within the monitoring period , is the number of data acquisitions within the monitoring period, is the th deformation data collected within the monitoring period;

[0036] Step S32: Screen the maximum deformation data of each deformation monitoring area within the monitoring period , w is the number of the deformation monitoring area on the elbow support column, and the maximum deformation data set of each deformation monitoring area on the elbow support column is obtained , W is the number of deformation monitoring areas on the elbow support column, is the W th maximum deformation data of the deformation monitoring area;

[0037] Step S33: At the same time, install vibration sensors at both ends of the connection position between the elbow support columns to collect the vibration data at both ends of the connection position within the monitoring period. The vibration data includes vibration amplitude and vibration direction, and form a vibration amplitude data set , and a vibration direction data set , ; where, are respectively the th vibration amplitudes collected at both ends of the connection position, are respectively the th vibration directions collected at both ends of the connection position.

[0038] Further, step S4 includes:

[0039] Step S41: Based on the deformation monitoring area corresponding to the maximum value in the maximum deformation data set , calculate the deformation following coefficient of the adjacent deformation monitoring area;

[0040] ;

[0041] Among them, is the maximum deformation data of the adjacent deformation monitoring area, w 0 is the number of the adjacent deformation monitoring area, w 1 is the number of adjacent deformation monitoring areas, is the maximum value The geometric center coordinates of the corresponding deformation monitoring area, are the geometric center coordinates of the adjacent deformation monitoring area;

[0042] Step S42: According to the vibration three-dimensional coordinate system, split the vibration direction data into vibration direction components along the three axes of the vibration three-dimensional coordinate system 、 , and calculate the discrete coefficient of the connection position at both ends with respect to the vibration direction during the monitoring period ;

[0043] ;

[0044] Among them, is the numbering of the data acquisition times during the monitoring period, 、 are respectively the th vibration direction components, is the ideal vibration direction offset;

[0045] Step S43: Use the vibration amplitude data set 、 to calculate the discrete coefficient of the connection position at both ends with respect to the vibration amplitude during the monitoring period ;

[0046] ;

[0047] Among them, are respectively the th vibration amplitudes collected at both ends of the connection position during the monitoring period, is the ideal vibration amplitude.

[0048] Furthermore, step S5 includes:

[0049] Step S51: Calculate the stability coefficient of the elbow support column connection during the monitoring period according to the deformation following coefficient , the discrete coefficient and the discrete coefficient ; ; They are the influence weight coefficients of the deformation influence range, the dispersion degree of the vibration direction, and the difference in the vibration amplitude on the connection stability of the elbow support column, respectively.

[0050] Step S52: Set the threshold value of the stability coefficient , and evaluate the stability of the connection of the elbow support column during the monitoring period; if , then the connection of the elbow support column is unstable during the monitoring period; if , then the connection of the elbow support column is stable during the monitoring period.

[0051] The beneficial effects of the present invention are as follows: By establishing a three-dimensional finite element model of the elbow support column, performing finite element mechanical analysis on the elbow support column, and simulating the real working conditions by applying dynamic connection loads, the areas on the elbow support column that need to be monitored for deformation are reasonably and accurately obtained, 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 elbow support column, processing and analyzing the vibration data during the monitoring period, and using the vibration difference between the two elbow support columns at both ends to evaluate the connection stability between the elbow support columns. The present invention can accurately determine the deformation monitoring area at the initial stage of the design and installation of the elbow support column, and effectively monitor and analyze the stability of the connection position in the later stage of the use of the elbow support column, providing strong technical support for the engineering construction related to the elbow support column on the building structure. Description of the Drawings

[0052] Figure 1 It is a flow chart of the method for evaluating the connection stability of the elbow support column. Specific Embodiments

[0053] The specific embodiments of the present invention will be described below to facilitate those skilled in the art of the present technology to understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art of the present technology, as long as various changes are within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are within the scope of protection.

[0054] As Figure 1 shown, a method for evaluating the connection stability of an elbow support column includes:

[0055] Step S1: Establish a three-dimensional finite element model according to the design dimension parameters of the elbow support column, perform finite element mechanical analysis, apply dynamic loads according to the dynamic connection load model, and determine the sub-monitoring areas on the elbow support column according to the deformation data and load data on each area of the three-dimensional finite element model. Step S1 specifically includes:

[0056] S11: Establish a three-dimensional finite element model according to the design dimension parameters of the elbow support column, divide the three-dimensional finite element model into several uniform sub-analysis blocks, and the sub-analysis blocks can be divided according to the mesh generation method of finite element analysis, and apply the target load borne during the use after the elbow support column is connected to the three-dimensional finite element model. F 1 ;

[0057] Step S12: Obtain the deformation data F 1 of each sub-analysis block under the target load and the load data borne . n is the number of the sub-analysis block;

[0058] Step S13: Apply the dynamic connection load to the three-dimensional finite element model based on the target load F 1 and record the deformation data set and the load data set borne by each sub-analysis block during the application of the dynamic connection load. m is the number of data records, is the sub-analysis block n the m th deformation data, is the sub-analysis block n the m th load data. The dynamic connection load model is:

[0059] ;

[0060] Among them, k is the number of discrete GLL points of each sub-analysis block, is the n th sub-analysis block at the k th GLL point corresponding to the fluctuation function of the dynamic connection load. The fluctuation function provides the fluctuating load data of the dynamic connection load fluctuating with time. t k is the k th time when the dynamic connection load is applied at the GLL point, t is the time when the dynamic connection load is applied, t 0 is the start time when the dynamic connection load is applied ，t 1 is the end time when the dynamic connection load is applied, t n is the sub-analysis block n the time when the dynamic connection load is applied, N is the number of sub-analysis blocks, is the sub-analysis blockn Apply the time function of the dynamic connection load fluctuation Apply the time function of the dynamic connection load fluctuation to discrete GLL points;

[0061] Step S14: Calculate the importance coefficient of the influence of each sub-analysis block on the stability of the elbow support column during the application of the dynamic connection load; the larger the deformation and the greater the load borne by the sub-analysis block during the finite element analysis process, the greater the influence of this area on the stability of the elbow support column;

[0062] ;

[0063] Among them, denotes taking the maximum value of the deformation data set in, denotes taking the maximum value of the load data set in, is the connection load threshold designed for the elbow support column, is the stiffness coefficient of the elbow support column, is the influence weight coefficient of deformation on the stability of the elbow support column, is the influence weight coefficient of load on the stability of the elbow support column, and ;

[0064] Step S15: Obtain the importance coefficient data set of each sub-analysis block on the three-dimensional finite element model, set the importance coefficient threshold for screening the sub-analysis blocks that need to be subjected to stability detection ;

[0065] If , it is determined that the sub-analysis block is not stable enough during the connection use of the elbow support column, and the area where it is located is used as the sub-monitoring area during the connection use of the elbow support column;

[0066] If , it is determined that the sub-analysis block is stable enough during the connection use of the elbow support column.

[0067] Step S2: After determining all the sub-monitoring areas on the elbow support column, merge the adjacent sub-monitoring areas to form a merged monitoring area, and determine the deformation monitoring area on the surface of the elbow support column. Step S2 specifically includes:

[0068] Step S21: Obtain all the sub-monitoring areas on the elbow support column to form a monitoring area data set, construct a three-dimensional coordinate system on the three-dimensional finite element model, and 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;

[0069] ;

[0070] Among them, is the distance between the centers of any two different sub-monitoring regions, are the coordinates of the centers of any two different sub-monitoring regions, u 、 v are the numbers of any two different sub-monitoring regions in the monitoring region data set;

[0071] Step S22: According to the size l of the sub-analysis blocks divided on the three-dimensional finite element model, filter two adjacent sub-monitoring regions according to the distance ;

[0072] If , it is determined that the sub-monitoring region u and the sub-monitoring region v are adjacent regions, and the sub-monitoring region u and the sub-monitoring region v are merged into one sub-monitoring region;

[0073] Otherwise, it is determined that the sub-monitoring region u and the sub-monitoring region v are not adjacent and no merging is performed;

[0074] Adjacent sub-monitoring regions are used as a deformation-sensitive region and need to be merged to reduce the difficulty of deformation monitoring and the simplicity of stability evaluation.

[0075] Step S23: Traverse each sub-monitoring region in the monitoring region data set, merge the adjacent sub-monitoring regions to form a merged monitoring region, and calculate the geometric center coordinates ;

[0076] ;

[0077] Among them, I is the number of sub-monitoring regions included in the merged monitoring region, i is the number of the sub-monitoring regions included in the merged monitoring region, is the center coordinate of the sub-monitoring region i ;

[0078] For the bent pipe support column, generally speaking, the monitoring region will occur in the curved surface region. According to the different shapes 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 perpendicular line to determine.

[0079] Step S24: Draw a perpendicular line passing through the geometric center coordinates and perpendicular to the outer surface of the merged monitoring area. The perpendicular point where the perpendicular line intersects the outer surface of the merged monitoring area is used as the installation point for deformation monitoring, and the corresponding surface area of the merged monitoring area on the elbow support column is used as the deformation monitoring area.

[0080] After the elbow support columns are connected and installed, install deformation monitoring sensors at the installation points on the deformation monitoring area, and install vibration sensors at both ends of the connection position between the elbow support columns to collect the deformation data of the deformation monitoring area and the vibration data at both ends of the connection position between the elbow support columns. Step S3 specifically includes:

[0081] Step S31: After the elbow support columns are connected and installed, install deformation monitoring sensors at the installation points on the deformation monitoring area. The deformation monitoring sensors collect the deformation data within the deformation monitoring area to form a deformation data set during the monitoring period. , is the number of data acquisitions during the monitoring period, is the th deformation data collected during the monitoring period;

[0082] Step S32: Screen the maximum deformation data of each deformation monitoring area during the monitoring period. , w is the number of the deformation monitoring area on the elbow support column, and obtain the maximum deformation data set of each deformation monitoring area on the elbow support column. , W is the number of deformation monitoring areas on the elbow support column, is the W th maximum deformation data of the deformation monitoring area;

[0083] Step S33: At the same time, install vibration sensors at both ends of the connection position between the elbow support columns to collect the 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 a vibration direction data set. , ; where, are the th vibration amplitudes collected at both ends of the connection position respectively, are the th vibration directions collected at both ends of the connection position respectively.

[0084] 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 areas. Calculate the discrete coefficient of the vibration direction at both ends of the internal connection position according to the vibration data. and the coefficient of variation regarding the vibration amplitude . Step S4 specifically includes:

[0085] Step S41: Based on the deformation monitoring area corresponding to the maximum value in the maximum deformation data set calculate the deformation following coefficient of the adjacent deformation monitoring area ; ;

[0086] ;

[0087] wherein, is the maximum deformation data of the adjacent deformation monitoring area, w 0 is the number of the adjacent deformation monitoring area, w 1 is the number of the adjacent deformation monitoring areas, is the maximum value corresponding to the geometric center coordinates of the deformation monitoring area, is the geometric center coordinates of the adjacent deformation monitoring area;

[0088] The deformation of the structure generally occurs in the deformation monitoring area with the largest deformation, and during the deformation process, it will extend to the adjacent deformation monitoring areas. Therefore, the influence of the deformation on the stability is evaluated by the degree of mutual influence between the deformation monitoring areas. The magnitude of the deformation following coefficient represents the degree of intention of the surrounding deformation by the maximum deformation point in the middle, that is, the degree of deformation diffusion.

[0089] Step S42: According to the vibration three-dimensional coordinate system, split the vibration direction data into vibration direction components along the three axes of the vibration three-dimensional coordinate system , . The vibration direction component represents the angle between the vibration direction and the three axes after projecting the vibration direction onto the three axes of the vibration three-dimensional coordinate system. Calculate the coefficient of variation regarding the vibration direction at both ends of the connection position during the monitoring period using the vibration direction component ;

[0090] ;

[0091] wherein, is the numbering of the data acquisition times during the monitoring period, , are respectively the th vibration direction components, is the ideal vibration direction offset;

[0092] Step S43: Use the vibration amplitude data set , Calculate the coefficient of variation of the vibration amplitude at both ends of the connection position within the monitoring period ;

[0093] ;

[0094] wherein, are respectively the th vibration amplitudes collected at both ends of the connection position within the monitoring period, is the ideal vibration amplitude.

[0095] The coefficient of variation in the vibration direction represents the degree of dispersion of the vibration in each direction. The larger the coefficient of variation , the more complex the change in the vibration direction; the coefficient of variation of the vibration amplitude represents the degree of dispersion of the vibration amplitude. The larger the coefficient of variation , the more complex the change in the vibration amplitude.

[0096] The present invention discusses the influence of vibration on stability through the vibration differences at both ends of the connection part, and separately discusses the vibration direction differences and vibration amplitude differences. For the connection part between the elbow support columns, the stability of the connection part can be ensured only when both ends vibrate simultaneously. If the vibration differences at the same moment at both ends are larger, this vibration difference will cause the connection part to accelerate detachment. Whether it is the difference in the vibration direction or the vibration amplitude at both ends, it poses a test to the stability of the connection part.

[0097] Step S5: Combine the deformation following coefficient , the coefficient of variation and the coefficient of variation to comprehensively evaluate the connection stability of the elbow support columns. Step S5 specifically includes:

[0098] Step S51: Calculate the stability coefficient of the connection of the elbow support columns within the monitoring period according to the deformation following coefficient , the coefficient of variation ; ; ; are respectively the influence weight coefficients of the deformation influence range, the degree of dispersion of the vibration direction, and the difference in the vibration amplitude on the connection stability of the elbow support columns;

[0099] Step S52: Set the threshold value of the stability coefficient, and evaluate the connection stability of the elbow support columns within the monitoring period; if , the connection of the elbow support columns within the monitoring period is unstable; if , the connection of the elbow support columns within the monitoring period is stable.

[0100] The present invention establishes a three-dimensional finite element model of the elbow support column, conducts finite element mechanical analysis on the elbow support column, and simulates the real working conditions by applying dynamic connection loads, so as to reasonably and accurately obtain the areas on the elbow support column that need to be monitored for deformation, 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 elbow support column, processing and analyzing the vibration data within the monitoring period, and using the vibration difference between the two elbow support columns at both ends to evaluate the stability of the connection between the elbow support columns. The present invention can accurately determine the deformation monitoring area at the initial stage of the design and installation of the elbow support column, and effectively monitor and analyze the stability of the connection position in the later stage of the use of the elbow support column, providing strong technical support for the engineering construction related to the elbow 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 connection position with respect to the vibration direction based on 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 the elbow support column connection; 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 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.

2. The method for evaluating the connection stability of a bent pipe support column according to claim 1, 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.

3. The method for evaluating the connection stability of a bent pipe support column according to claim 2, 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.

4. The method for evaluating the connection stability of a bent pipe support column according to claim 3, 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.

5. The method for evaluating the connection stability of a bent pipe support column according to claim 4, 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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