Building structure safety visualization monitoring method

Abstract

Disclosed in the present invention is a building structure safety visualization monitoring method, comprising: establishing a finite element model of a monitoring object; respectively setting a forced displacement of magnitude 1 at monitoring points of the finite element model, and calculating a structural deformation of the monitoring point under the action of forced displacement; calculating an initial structural deformation of the monitoring object under the action of dead load, and integrating deformation index data of nodes into a structural initial deformation vector; installing displacement sensors on the monitoring object, carrying out structural deformation monitoring on the monitoring points, obtaining monitoring data, and integrating the monitoring data into a monitoring data column vector; calculating a modal coefficient vector of the current monitoring data; calculating an additional deformation response column vector of the monitoring object under the monitoring data; calculating the total structural deformation of the monitoring object; and mapping the data in a building information model diagram for three-dimensional visualization display. According to the present invention, the overall total structural deformation and safety levels of a building structure can be calculated and undergo three-dimensional visual display, and readability is good.

Description

A visual monitoring method for building structure safety Technical Field

[0001] The present invention relates to the technical field of construction engineering, and in particular to a method for visually monitoring building structure safety. Background Art

[0002] As building structures age and material properties degrade, more and more existing buildings require structural safety monitoring during use to ensure safe and reliable operation. Currently, structural safety monitoring of existing buildings typically involves installing sensors to monitor deformation indicators at specific locations on the object. The sensor data is then used to generate corresponding monitoring reports or plot monitoring data curves. This approach suffers from the following two main shortcomings:

[0003] First, only the deformation indicators of the structure at a few monitoring points can be obtained, and it is impossible to establish a connection between the scattered data and the overall deformation of the structure.

[0004] Second, monitoring data presented in the form of reports or data change curves requires readers to have a certain background knowledge related to civil engineering, and the data readability is poor.

[0005] Summary of the Invention

[0006] The purpose of the present invention is to provide a method for visually monitoring building structure safety to solve the above problems.

[0007] In order to solve the above technical problems, the present invention provides a method for visually monitoring building structure safety, comprising:

[0008] Step 1: Establish a finite element model of the monitoring object;

[0009] Step 2: Set a forced displacement of 1 at each monitoring point of the finite element model, and calculate the structural deformation of the monitored object under the action of the forced displacement at the monitoring point; including:

[0010] Step 2.1: Integrate the data of structural deformation under forced displacement at different monitoring points to form the generalized flexibility matrix A of the deformation at the monitoring points.

[0011] Among them, A i,j It represents the deformation of node i when a forced displacement of 1 occurs at monitoring point j, m is the number of nodes for deformation calculation of the monitored object structure, and n is the number of monitoring points;

[0012] Step 2.2: Integrate the deformation data of the remaining monitoring points under the forced displacement of a certain monitoring point to form the original deformation modal matrix M of the monitoring point.

[0013] Among them, M i,j It represents the deformation of monitoring point i when a forced displacement of 1 occurs at monitoring point j, and n is the number of monitoring points;

[0014] Step 3: Calculate the initial structural deformation of the monitored object under the action of the constant load, and integrate the deformation index data of each node into the initial structural deformation vector

[0015] Among them, y i represents the initial deformation of the i-th node under the action of the dead load, and m is the number of nodes for the deformation calculation of the monitored object structure.

[0016] Step 4: Install displacement sensors at monitoring locations on the monitored object corresponding to the monitoring points of the finite element model, monitor the structural deformation of the monitoring points, obtain monitoring data, and integrate the monitoring data into a monitoring data column vector

[0017] Among them, d i represents the monitoring data of the i-th monitoring point, and n is the number of monitoring points;

[0018] Step 5: Calculate the modal coefficient vector of the current monitoring data

[0019] Among them, a i represents the i-th modal coefficient, and n is the number of monitoring points;

[0020] The modal coefficient vector The calculation method is:

[0021] in, is the modal coefficient vector, M -1 is the inverse matrix of the modal original matrix M, is the monitoring data column vector;

[0022] Step 6: Calculate the additional deformation response column vector of the monitored object under the monitoring data

[0023] Where Δy i is the calculated additional deformation of the i-th node under the current monitoring data, and m is the number of nodes for the structural deformation calculation of the monitored object;

[0024] The additional deformation response column vector Calculate according to the following formula:

[0025] Where A is the generalized flexibility matrix based on the deformation of the monitoring point, is the modal coefficient vector;

[0026] Step 7: Calculate the total structural deformation of the monitored object according to the following formula;

[0027] Step 8: Map the data of the total structural deformation of the monitored object calculated in step 7 to the building information model diagram of the monitored object for three-dimensional visualization.

[0028] Furthermore, in the method for visual monitoring of building structure safety provided by the present invention, in step 8, the method for performing three-dimensional visualization processing includes:

[0029] Step 8.1, classify the structural safety level;

[0030] According to the stress level of the most unfavorable load-bearing component in the structure of the monitored object, the structural safety level is divided into four levels. The corresponding relationship between each level and the stress level of the most unfavorable load-bearing component is as follows:

[0031] Grade A: The stress level of the most unfavorable load-bearing component is less than or equal to 60% of its material design strength, indicated in green;

[0032] Grade B: The stress level of the most unfavorable load-bearing component is greater than 60% of its material design strength and less than or equal to 85% of its material design strength, indicated in blue;

[0033] Grade C: The stress level of the most unfavorable load-bearing component is greater than 85% of its material design strength and less than or equal to 100% of its material design strength, indicated in orange;

[0034] Grade D: The stress level of the most unfavorable load-bearing component is greater than 100% of its material design strength, indicated by red;

[0035] Step 8.2, calculate the maximum deformation value of the structure corresponding to the most unfavorable stress level of the load-bearing component through the finite element model;

[0036] When the stress level of the most unfavorable load-bearing component reaches 60%, the maximum deformation value of each node of the monitoring object is △1;

[0037] When the stress level of the most unfavorable load-bearing component reaches 85%, the maximum deformation value of each node of the monitoring object is △2;

[0038] When the stress level of the most unfavorable load-bearing component reaches 100%, the maximum deformation value of each node of the monitoring object is △3;

[0039] △1, △2, and △3 are used as deformation thresholds for structural safety level;

[0040] When the deformation of a certain point in the structure is less than or equal to △1, the point is Class A;

[0041] When the deformation of a certain point in the structure is greater than △1 and less than or equal to △2, the point is classified as Class B;

[0042] When the deformation of a certain point in the structure is greater than △2 and less than or equal to △3, the point is classified as Class C;

[0043] When the deformation of a certain point of the structure is greater than △3, the point is classified as Class D;

[0044] Step 8.3, calculate the deformation value at any point of the monitored object;

[0045] Based on the deformation of the structural node position of the monitored object calculated in step 7, the deformation value of any point on the monitored object can be interpolated and calculated, and the structural safety level at that point can be determined based on its size. The corresponding color scale RGB value is matched and color rendering is performed at the corresponding position of the building information model diagram of the monitored object, so as to reflect the overall structural deformation and safety level of the monitored object through the building information model diagram.

[0046] Furthermore, in the method for visual monitoring of building structure safety provided by the present invention, in step 2, the original modal matrix is ​​substituted into a forced displacement in which all diagonal elements are 1 to obtain:

[0047] Furthermore, in the method for visually monitoring building structure safety provided by the present invention, in step 2, the method for calculating the deformation of the monitored object under the action of forced displacement at the monitoring point includes:

[0048] In the finite element model, without any external load, a forced displacement of 1 is applied to the first monitoring point, and the finite element model calculation is performed. Then, based on the calculation results, the deformation index data of the entire structural model from node 1 to node m are recorded respectively, and the data are filled in the first column of the generalized flexibility matrix; the deformation index data of the remaining monitoring points except the first monitoring point are recorded respectively, and the data are filled in the corresponding positions in the first column of the modal original matrix;

[0049] Delete the forced displacement of the first monitoring point, apply a forced displacement of 1 to the second monitoring point, and perform finite element model calculations. Then, based on the calculation results, record the displacement of the entire structural model from node 1 to node m, and fill the data into the second column of the generalized flexibility matrix. Record the deformation index data of the remaining monitoring points except the second monitoring point, and fill the data into the corresponding positions in the second column of the modal original matrix.

[0050] By analogy, the deformation calculation of the entire structure is completed when a forced displacement of 1 occurs at each of the n monitoring points, and the data is filled in the corresponding position of the generalized flexibility matrix; the deformation data of the remaining monitoring points, except for the monitoring points where the forced displacement is applied, are filled in the corresponding positions of the modal original matrix.

[0051] Furthermore, in the method for visual monitoring of building structure safety provided by the present invention, in step 2, the magnitude of the forced displacement is set to other values ​​instead of 1.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] The building structure safety visualization monitoring method provided by the present invention calculates the overall total deformation and safety level of the building structure in the current state through monitoring data from a limited number of monitoring points, and performs three-dimensional visualization of the structural deformation data, providing a more comprehensive basis for judging the structural safety of the building structure. Compared with traditional scattered structure monitoring and monitoring data reports and monitoring data curves, the readability of the structural deformation monitoring data is improved, the threshold for non-professionals to read the monitoring data is lowered, and the overall structural deformation of the building structure and the deformation of the nodes can be intuitively reflected, so that the monitoring data can better serve the operation and management units of the building. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] FIG1 is a modeling diagram of the building information model of the concert hall dome roof truss;

[0055] FIG2 is a building information model diagram showing structural deformation of the dome roof truss of the concert hall; DETAILED DESCRIPTION

[0056] The present invention will be described in detail below with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are all in a very simplified form and are not accurately scaled, and are only used to facilitate and clearly illustrate the embodiments of the present invention.

[0057] This patent takes the dome roof truss of a concert hall as an example to demonstrate the specific implementation process of the method described in this patent.

[0058] An embodiment of the present invention provides a method for visually monitoring building structure safety, comprising:

[0059] Step 1: Establish a finite element model of the monitored object; in this case, the monitored object is the dome roof truss of the concert hall, as shown in Figure 1.

[0060] Step 2: Set a forced displacement of 1 at each monitoring point of the finite element model and calculate the structural deformation of the monitored object under the action of the forced displacement at the monitoring point. This includes:

[0061] Step 2.1: Integrate the data of structural deformation under forced displacement at different monitoring points to form the generalized flexibility matrix A of the deformation at the monitoring points.

[0062] Among them, A i,j It represents the deformation of node i when a forced displacement of 1 occurs at monitoring point j. m is the number of nodes for deformation calculation of the monitored object structure, and n is the number of monitoring points.

[0063] Step 2.2: Integrate the deformation data of the remaining monitoring points under the forced displacement of a certain monitoring point to form the original deformation modal matrix M of the monitoring point.

[0064] Among them, M i,j It represents the deformation of monitoring point i when a forced displacement of 1 occurs at monitoring point j, and n is the number of monitoring points.

[0065] In step 2.2, the original modal matrix is ​​substituted into a forced displacement with all diagonal elements set to 1 to obtain:

[0066] In step 2, the method for calculating the deformation of the monitored object under the forced displacement of the monitoring point includes:

[0067] In the finite element model, without any external load, a forced displacement of 1 is applied to the first monitoring point to perform finite element model calculations. Then, based on the calculation results, the deformation index data of the entire structural model from node 1 to node m are recorded separately, and the data are filled in the first column of the generalized flexibility matrix; the deformation index data of the remaining monitoring points except the first monitoring point are recorded separately, and the data are filled in the corresponding positions in the first column of the modal original matrix.

[0068] Delete the forced displacement of the first monitoring point, apply a forced displacement of 1 to the second monitoring point, and calculate the finite element model. Then, based on the calculation results, record the displacement of the entire structural model from node 1 to node m, and fill the data into the second column of the generalized flexibility matrix; record the deformation index data of the remaining monitoring points except the second monitoring point, and fill the data into the corresponding positions in the second column of the modal original matrix.

[0069] By analogy, the deformation calculation of the entire structure is completed when a forced displacement of 1 occurs at each of the n monitoring points, and the data is filled in the corresponding position of the generalized flexibility matrix; the deformation data of the remaining monitoring points, except for the monitoring points where the forced displacement is applied, are filled in the corresponding positions of the modal original matrix.

[0070] The calculation results are placed in the corresponding positions in the generalized flexibility matrix A and the corresponding positions in the modal original matrix M according to the rules.

[0071] Table 1 below shows the generalized flexibility matrix for this roof truss structure. When setting nodes, the endpoints of any member on the truss are set as nodes. This truss structure has a total of 140 nodes, so the generalized flexibility matrix has 140 rows. During monitoring, three monitoring points are placed at each of the third and sixth members from the left in the figure above, for a total of six monitoring points to monitor the settlement and deformation of the truss. Therefore, the generalized flexibility matrix has six columns. In the generalized flexibility matrix, the row number of each element is its node number, and the column number is the number of the monitoring point at which the current forced displacement occurs. For example, the element 9.007E-02 in the first row and first column of the generalized flexibility matrix indicates that when a forced displacement of 1 mm occurs at the first monitoring point, the deformation of node 1 is 9.007E-02 mm.

[0072] Table 1.

[0073] As shown in Table 2 below, this is the original modal matrix of the six monitoring points of the roof truss structure:

[0074] Table 2.

[0075] Because there are six monitoring points, the order of the modal primitive matrix is ​​6×6, where the row number of the element is the monitoring point number, and the column number of the element indicates the monitoring point number at which the forced displacement occurs. For example, the element 4.279E-01mm in the second row and first column of the modal primitive matrix indicates that when a forced displacement of 1 occurs at monitoring point 1, the deformation at monitoring point 2 is 4.279E-01mm.

[0076] Step 3: Calculate the initial structural deformation of the monitored object under the action of the constant load, and integrate the deformation index data of each node into the initial structural deformation vector

[0077] Among them, y i represents the initial deformation of the i-th node under the action of the dead load, and m is the number of nodes for the deformation calculation of the monitored object structure.

[0078] As shown in Table 3 below, the initial deformations of the 140 nodes of the roof truss structure under the action of a dead load are shown. The row number of the element is the node number. For example, the element 1.99571 in the third row indicates that the settlement deformation of node 3 under the action of a dead load is 1.99571 mm.

[0079] Table 3.

[0080] Step 4: Install displacement sensors at monitoring locations on the monitored object corresponding to the monitoring points of the finite element model, monitor the structural deformation of the monitoring points, obtain monitoring data, and integrate the monitoring data into a monitoring data column vector

[0081] Among them, d i represents the monitoring data of the i-th monitoring point, and n is the number of monitoring points;

[0082] Taking the data monitored at a certain moment as an example, the column vectors of the roof truss settlement deformation monitored by the six monitoring points are shown in Table 4. The row where the element is located represents the change of the monitoring point. For example, the element 2.1 in the second row represents the settlement deformation monitored by monitoring point 2 at this moment.

[0083] Table 4.

[0084] Step 5: Calculate the modal coefficient vector of the current monitoring data That is, the current monitoring data column vector is represented by the combination coefficient of the linear combination of the column vectors in the modal original matrix, as shown below:

[0085] Among them, a i represents the i-th modal coefficient, and n is the number of monitoring points;

[0086] Before calculating the modal vector, the original modal matrix needs to be inverted. The inverse matrix of the original modal matrix is ​​shown in Table 5 below:

[0087] Table 5

[0088] According to the modal coefficient vector The calculation formula is:

[0089] in, is the modal coefficient vector, M -1 is the inverse matrix of the modal original matrix M, is the column vector of monitoring data; the modal coefficient vector is calculated, as shown in Table 6 below:

[0090] Table 6

[0091] Step 6: Calculate the additional deformation response column vector of the monitored object under the monitoring data

[0092] Where Δy i is the calculated additional deformation of the i-th node under the current monitoring data, and m is the number of nodes for the structural deformation calculation of the monitored object;

[0093] where the additional deformation response column vector Calculate according to the following formula, and the results are shown in Table 7 below:

[0094] Where A is the generalized flexibility matrix based on the deformation of the monitoring point, is the modal coefficient vector.

[0095] Table 7.

[0096] Step 7: Calculate the total structural deformation of the monitored object, i.e., the total settlement, according to the following formula;

[0097] According to the formula in step 7, the total settlement of each node of the roof truss structure at this time is shown in Table 8 below:

[0098] Table 8.

[0099] Step 8: Map the total structural deformation data of the monitored object calculated in step 7 to the building information model of the monitored object for three-dimensional visualization. This may include:

[0100] Step 8.1, classify the structural safety level;

[0101] According to the stress level of the most unfavorable load-bearing component in the structure of the monitored object, the structural safety level is divided into four levels. The corresponding relationship between each level and the stress level of the most unfavorable load-bearing component is as follows:

[0102] Grade A: The stress level of the most unfavorable load-bearing component is less than or equal to 60% of its material design strength, indicated in green;

[0103] Grade B: The stress level of the most unfavorable load-bearing component is greater than 60% of its material design strength and less than or equal to 85% of its material design strength, indicated in blue;

[0104] Grade C: The stress level of the most unfavorable load-bearing component is greater than 85% of its material design strength and less than or equal to 100% of its material design strength, indicated in orange;

[0105] Grade D: The stress level of the most unfavorable load-bearing component is greater than 100% of its material design strength, indicated by red;

[0106] Step 8.2, calculate the maximum deformation value of the structure corresponding to the most unfavorable stress level of the load-bearing component through the finite element model;

[0107] When the stress level of the most unfavorable load-bearing component reaches 60%, the maximum deformation value of each node of the monitoring object is △1;

[0108] When the stress level of the most unfavorable load-bearing component reaches 85%, the maximum deformation value of each node of the monitoring object is △2;

[0109] When the stress level of the most unfavorable load-bearing component reaches 100%, the maximum deformation value of each node of the monitoring object is △3;

[0110] △1, △2, and △3 are used as deformation thresholds for structural safety level;

[0111] When the deformation of a certain point in the structure is less than or equal to △1, the point is Class A;

[0112] When the deformation of a certain point in the structure is greater than △1 and less than or equal to △2, the point is classified as Class B;

[0113] When the deformation of a certain point in the structure is greater than △2 and less than or equal to △3, the point is classified as Class C;

[0114] When the deformation of a certain point of the structure is greater than △3, the point is classified as Class D;

[0115] Step 8.3, calculate the deformation value at any point of the monitored object;

[0116] Based on the deformation of the structural node position of the monitored object calculated in step 7, the deformation value of any point on the monitored object can be interpolated and calculated, and the structural safety level at that point can be determined based on its size. The corresponding color scale RGB value is matched and color rendering is performed at the corresponding position of the building information model diagram of the monitored object, so as to reflect the overall structural deformation and safety level of the monitored object through the building information model diagram.

[0117] According to the above principles, the roof truss structure is divided into four levels of structural safety according to the stress level of the most unfavorable load-bearing component, and the corresponding structural deformation thresholds are calculated according to the stress level of the most unfavorable load-bearing component. The calculated safety level deformation thresholds of the roof truss structure are: △1 = 25mm, △2 = 35mm, and △3 = 42mm.

[0118] Based on the calculated total settlement value of each node of the roof truss, the displacement at any point on the roof truss structure can be interpolated and calculated. During interpolation, the settlement at both ends of the rod where the interpolation point is located is interpolated according to the rod length. Then, based on the relationship between the calculation result and △1, △2, and △3, the current safety level status of the position is determined, and the corresponding color RGB value is used to perform a three-dimensional visualization of the overall deformation of the current roof truss structure, as shown in Figure 2.

[0119] In order to calculate the total settlement value of each node of the roof truss, the visual monitoring method for building structure safety provided by the embodiment of the present invention sets the magnitude of the forced displacement to other values ​​instead of 1 in step 2.

[0120] The method for visualizing the safety of building structures provided by the embodiments of the present invention calculates the overall deformation and safety level of the building structure in its current state through monitoring data from a limited number of monitoring points, and performs a three-dimensional visual display of the structural deformation data, thereby providing a more comprehensive basis for judging the structural safety of the building structure. Compared with traditional scattered-point structural monitoring and monitoring data reports and monitoring data curves, the method improves the readability of the structural deformation monitoring data, lowers the threshold for non-professionals to read the monitoring data, and can intuitively reflect the overall structural deformation of the building structure and the deformation of the nodes, so that the monitoring data can better serve the operation and management units of the building.

[0121] The method for visually monitoring building structure safety provided by the embodiment of the present invention also has the following technical effects:

[0122] First, a method for calculating the overall deformation of the structure based on monitoring data is proposed;

[0123] Second, the principle of dividing the structural safety level based on the stress level of the components is proposed;

[0124] Third, a calculation method for the structural deformation threshold corresponding to the structural safety level is proposed;

[0125] 4. Use a structural deformation rendering method corresponding to the color scale of the structural safety level;

[0126] 5. Non-professionals in the building management unit can determine the overall safety status of the current structure based on the color of the rendered structure.

[0127] The present invention is not limited to the specific embodiments described above. Obviously, the embodiments described above are only some embodiments of the embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention described, all other embodiments obtained by ordinary technicians in this field fall within the scope of protection of the present invention. Those skilled in the art can make other levels of modifications and changes to the present invention. In this way, if these modifications and changes of the present invention fall within the scope of the claims of the present invention, the present invention is also intended to include these changes and changes.

Claims

1. A visual monitoring method for building structure safety, characterized in that: include: Step 1, establishing a finite element model of the monitored object; Step 2, respectively setting a forced displacement of 1 at the monitoring points of the finite element model, and calculating the structural deformation of the monitored object under the action of the forced displacement at the monitoring point; including: Step 2.1: Integrate the data of structural deformation under forced displacement at different monitoring points to form the generalized flexibility matrix A of the deformation at the monitoring points. Among them, A i,j It represents the deformation of node i when a forced displacement of 1 occurs at monitoring point j, m is the number of nodes for deformation calculation of the monitored object structure, and n is the number of monitoring points; Step 2.2: Under the forced displacement of a certain monitoring point, the deformation data of the remaining monitoring points are integrated to form the original deformation modal matrix M of the monitoring point. Among them, M i,j It represents the deformation of monitoring point i when a forced displacement of 1 occurs at monitoring point j, and n is the number of monitoring points; Step 3: Calculate the initial structural deformation of the monitored object under the action of the constant load, and integrate the deformation index data of each node into the initial structural deformation vector Among them, y i represents the initial deformation of the ith node under the action of the dead load, and m is the number of nodes for calculating the deformation of the monitored object structure. Step 4: Install displacement sensors at monitoring positions on the monitored object corresponding to the monitoring points of the finite element model, monitor the structural deformation of the monitoring points, obtain monitoring data, and integrate the monitoring data into a monitoring data column vector Among them, d i represents the monitoring data of the i-th monitoring point, and n is the number of monitoring points; Step 5: Calculate the modal coefficient vector of the current monitoring data Among them, a i represents the i-th modal coefficient, n is the number of monitoring points; The modal coefficient vector The calculation method is: in, is the modal coefficient vector, M -1 is the inverse matrix of the modal original matrix M, is the monitoring data column vector; Step 6: Calculate the additional deformation response column vector of the monitored object under the monitoring data Among them, Δy i is the calculated additional deformation of the ith node under the current monitoring data, and m is the number of nodes for the structural deformation calculation of the monitored object; The additional deformation response column vector Calculate according to the following formula: Where A is the generalized flexibility matrix based on the deformation of the monitoring point, is the modal coefficient vector; Step 7, calculating the total structural deformation of the monitored object according to the following formula; Step 8, mapping the data of the total structural deformation of the monitored object calculated in step 7 to the building information model diagram of the monitored object for three-dimensional visualization.

2. The method for visual monitoring of building structure safety according to claim 1, characterized in that: In step 8, the method for performing three-dimensional visualization processing includes: Step 8.1, classify the structural safety level; According to the stress level of the most unfavorable stress-bearing component in the structure of the monitored object, the structural safety level is divided into four levels. The corresponding relationship between each level and the stress level of the most unfavorable stress-bearing component is as follows: Grade A: The stress level of the most unfavorable load-bearing component is less than or equal to 60% of its material design strength, indicated in green; Grade B: The stress level of the most unfavorable load-bearing component is greater than 60% of its material design strength and less than or equal to 85% of its material design strength, indicated in blue; Grade C: The stress level of the most unfavorable load-bearing component is greater than 85% of its material design strength and less than or equal to 100% of its material design strength, indicated in orange; Grade D: The stress level of the most unfavorable load-bearing component is greater than 100% of its material design strength, indicated in red; Step 8.2, calculating the maximum deformation value of the structure corresponding to the most unfavorable stress level of the load-bearing component through the finite element model; When the stress level of the most unfavorable load-bearing component reaches 60%, the maximum deformation value of each node of the monitoring object is △1; When the stress level of the most unfavorable load-bearing component reaches 85%, the maximum deformation value of each node of the monitoring object is △2; When the stress level of the most unfavorable load-bearing component reaches 100%, the maximum deformation value of each node of the monitoring object is △3; △1, △2, and △3 are used as deformation thresholds for structural safety levels; When the deformation of a certain point of the structure is less than or equal to △1, the point is Class A; When the deformation of a certain point of the structure is greater than △1 and less than or equal to △2, the point is Class B; When the deformation of a certain point of the structure is greater than △2 and less than or equal to △3, the point is Class C; When the deformation of a certain point of the structure is greater than △3, the point is Class D; Step 8.3, calculating the deformation value at any point of the monitored object; According to the deformation of the structural node position of the monitored object calculated in step 7, the deformation value of any point on the monitored object can be interpolated and calculated, and the structural safety level at that point can be determined according to its size. The corresponding color scale RGB value is matched to perform color rendering at the corresponding position of the building information model diagram of the monitored object, so as to reflect the overall structural deformation and safety level of the monitored object through the building information model diagram.

3. The method for visually monitoring building structure safety according to claim 1, characterized in that: In step 2, the root is substituted into the modal original matrix with a forced shift where all diagonal elements are 1 to obtain:

4. The method for visual monitoring of building structure safety according to claim 1, characterized in that: In step 2, the method for calculating the deformation of the monitored object under the forced displacement of the monitoring point includes: In the finite element model, without any external load, a forced displacement of 1 is applied to the first monitoring point to perform finite element model calculations. Then, based on the calculation results, the deformation index data of the entire structural model from node 1 to node m are recorded respectively, and the data are filled into the first column of the generalized flexibility matrix; the deformation index data of the remaining monitoring points except the first monitoring point are recorded respectively, and the data are filled into the corresponding positions in the first column of the modal original matrix; Delete the forced displacement of the first monitoring point, apply a forced displacement of 1 to the second monitoring point, and calculate the finite element model. Then, based on the calculation results, record the displacement of the entire structural model from node 1 to node m, and fill the data into the second column of the generalized flexibility matrix; record the deformation index data of the remaining monitoring points except the second monitoring point, and fill the data into the corresponding positions in the second column of the modal original matrix; By analogy, the deformation calculation of the entire structure is completed when a forced displacement of 1 occurs at n monitoring points, and the data is filled in the corresponding position of the generalized flexibility matrix; the deformation data of the remaining monitoring points, except for the monitoring points where forced displacement is applied, are filled in the corresponding positions of the modal original matrix.

5. The method for visual monitoring of building structure safety according to claim 1, characterized in that: In step 2, the magnitude of the forced displacement is set to another value instead of 1.

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