A method and device for evaluating stiffness and monitoring degradation of the connection nodes between corridors and towers

Abstract

The present invention relates to the field of civil engineering technology, and specifically to a method and device for assessing and monitoring the stiffness and degradation of the connection nodes between corridors and towers. The method determines the key degradation forms and sensitive comfort indexes of the connection nodes through simulation analysis of existing structural models, obtains a connection node stiffness assessment model, obtains the sensitive comfort index of the target building through on-site comfort testing, obtains the stiffness degradation coefficient of the corridor connection node of the target building based on the connection node stiffness assessment model, and performs stiffness assessment and degradation monitoring on the target building based on the corridor connection node stiffness degradation coefficient. This method eliminates the need to change the structural form and original connection state of the connection part, thereby solving the problem of low accuracy in predicting the stiffness of the connection part due to the use of a direct measurement method to change the structural form and original connection state of the connection part in the current measurement of the stiffness of the connection node between corridors and towers.

Description

Technical Field

[0001] The present invention relates to the technical field of civil engineering, and in particular to a method and device for evaluating stiffness and monitoring degradation of connection nodes between a corridor and a tower. Background Art

[0002] The main structure of the corridor usually adopts the form of a steel truss structure. Its construction process is generally to assemble it in situ at a low location, then lift it as a whole to the specified height, and then connect the nodes. Due to construction errors and construction quality issues, the actual stiffness of the connection nodes between the corridor and the tower deviates from the initial design. In addition, under long-term use and the influence of environmental factors such as temperature, wind, and rain all year round, the corridor not only has to bear its own gravity load, but also has to coordinate the deformation differences and asynchronous vibrations of the tower. Under the action of reciprocating loads, the components and nodes at the connection between the corridor and the tower are prone to strength degradation and fatigue cumulative damage, resulting in degradation of the stiffness of the connection parts, which in turn affects the comfort of the corridor. Structural health monitoring technology can detect the degradation of the stiffness of the connection nodes as early as possible, so that appropriate measures can be taken at an opportune moment to reduce unnecessary social impacts.

[0003] In the existing technology, in order to obtain the stiffness of the connection node between the corridor and the tower, a direct measurement method is used. A measuring instrument is placed at the connection node, and the stiffness of the connection node is calculated by measuring the stress state of the connection node. Although the direct measurement method is simple and easy to implement, it changes the structural form and original connection state of the connection part, reducing the accuracy of the connection part stiffness prediction. In addition, the connection node stiffness is an overall indicator reflecting the entire connection part and is affected by multiple factors. The direct measurement method can only measure the influence of a single factor. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a method and equipment for evaluating the stiffness and monitoring the degradation of the connection nodes between corridors and towers, so as to overcome the problem of low accuracy in predicting the stiffness of the connection parts due to the use of direct measurement methods, which changes the structural form and original connection state of the connection parts.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions:

[0006] On the one hand, the present application provides a method for assessing stiffness and monitoring degradation of the connection nodes between corridors and towers, including:

[0007] Obtain a pre-built structural model that is identical to the target building structure;

[0008] determining key degradation forms of connection points according to the structural model;

[0009] determining a sensitive comfort index according to the structural model;

[0010] Establishing a connection point stiffness evaluation model according to the key degradation form of the connection point and the sensitive comfort index;

[0011] Obtaining a sensitive comfort index of the target building through on-site comfort testing;

[0012] The sensitive comfort index of the target building is input into the connection point stiffness evaluation model to obtain the stiffness degradation coefficient of the corridor connection node of the target building.

[0013] Furthermore, in the above method, determining the key degradation form of the connection point according to the structural model includes:

[0014] Determining the key stiffness form of the connection node according to the structural model;

[0015] determining key degradation locations of connection nodes according to the structural model;

[0016] Determining the key degradation form of the connection point according to the key stiffness form of the connection node and the key degradation position of the connection node;

[0017] According to the stiffness degradation coefficient of the corridor connection node, the stiffness evaluation and degradation monitoring of the target building are performed.

[0018] Furthermore, in the above method, the key stiffness forms of the connection node include: translational stiffness and rotational stiffness.

[0019] Furthermore, in the above method, the key degradation positions of the connection nodes include: the floor and beam end positions of the connection nodes.

[0020] Furthermore, in the above method, determining the sensitivity comfort index according to the structural model includes:

[0021] Obtain the degree of change of the vertical natural frequency and vertical acceleration of the corridor under different key stiffness forms of the connection nodes;

[0022] Obtain the degree of change of vertical vibration acceleration at different locations of the corridor under different key degradation positions of the connection nodes;

[0023] The sensitivity comfort index is determined according to the degree of change of the vertical natural frequency of the corridor, the degree of change of the vertical acceleration of the corridor, and the degree of change of the vertical vibration acceleration at different positions of the corridor.

[0024] Furthermore, the method described above, wherein the connection point stiffness evaluation model is established according to the key degradation form of the connection point and the sensitive comfort index, comprises:

[0025] Obtaining a stiffness degradation coefficient of a key degradation form of the connection point;

[0026] performing normalization processing on the sensitive comfort index;

[0027] The mapping relationship between the stiffness degradation coefficient of the key degradation form of the connection point and the normalized sensitive comfort index is determined through regression analysis, thereby establishing a connection point stiffness evaluation model.

[0028] Furthermore, in the above method, obtaining the sensitive comfort index of the target building through on-site comfort testing includes:

[0029] Obtaining a measured value of a sensitive comfort index of the target building by arranging acceleration sensors on key degraded floors of the corridor of the target building;

[0030] By performing comfort simulation analysis on the measured values ​​of the sensitive comfort index, the sensitive comfort index of the target building connection node with no stiffness degradation and the sensitive comfort index of the target building connection node with complete stiffness degradation are obtained.

[0031] Furthermore, the method described above, wherein the sensitive comfort index of the target building is input into the connection point stiffness evaluation model to obtain the stiffness degradation coefficient of the corridor connection node of the target building, includes:

[0032] Calculating a normalized sensitive comfort index according to the sensitive comfort index of the target building connection node when the stiffness is not degraded and the sensitive comfort index of the target building connection node when the stiffness is completely degraded;

[0033] The normalized sensitive comfort index is substituted into the connection point stiffness evaluation model to obtain the corridor connection node stiffness degradation coefficient of the target building.

[0034] On the other hand, the present application also provides a device for assessing stiffness and monitoring degradation of a corridor-to-tower connection node, comprising a processor and a memory, wherein the processor is connected to the memory:

[0035] The processor is configured to call and execute the program stored in the memory;

[0036] The memory is used to store the program, and the program is at least used to execute any one of the methods described above.

[0037] The beneficial effects of the present invention are:

[0038] This application first obtains a pre-established structural model identical to the target building structure, determines the key degradation forms of the connection points based on the structural model, and determines the sensitive comfort index based on the structural model. Then, a connection point stiffness assessment model is established based on the key degradation forms of the connection points and the sensitive comfort index. Finally, the sensitive comfort index of the target building is obtained through on-site comfort testing, and the sensitive comfort index of the target building is input into the connection point stiffness assessment model to obtain the stiffness degradation coefficient of the corridor connection node of the target building. In this application, the key degradation forms of the connection nodes and the sensitive comfort index are determined through simulation analysis of the existing structural model to obtain the connection node stiffness assessment model. The sensitive comfort index of the target building is obtained through on-site comfort testing, and the stiffness degradation coefficient of the corridor connection node of the target building is obtained based on the connection node stiffness assessment model. Based on the corridor connection node stiffness degradation coefficient, the stiffness assessment and degradation monitoring of the target building are performed. This method does not require changing the structural form and original connection state of the connection part, solving the problem of low accuracy in the current measurement of the stiffness of the corridor and tower connection node, which is caused by the direct measurement method that changes the structural form and original connection state of the connection part. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 This is a flow chart provided by an embodiment of a method for evaluating stiffness and monitoring degradation of a connection node between a corridor and a tower according to the present invention;

[0041] Figure 2 It is a structural schematic diagram provided by an embodiment of a corridor and tower connection node stiffness assessment and degradation monitoring device of the present invention. DETAILED DESCRIPTION

[0042] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0043] In the existing technology, in order to obtain the stiffness of the connection node between the corridor and the tower, a direct measurement method is used. A measuring instrument is placed at the connection node, and the stiffness of the connection node is calculated by measuring the stress state of the connection node. Although the direct measurement method is simple and easy to implement, it changes the structural form and original connection state of the connection part, reducing the accuracy of the connection part stiffness prediction. In addition, the connection node stiffness is an overall indicator reflecting the entire connection part and is affected by multiple factors. The direct measurement method can only measure the influence of a single factor.

[0044] In view of this, the purpose of the present invention is to provide a method and equipment for evaluating the stiffness of the connection nodes between corridors and towers, so as to overcome the problem of low accuracy in predicting the stiffness of the connection parts due to the use of direct measurement methods, which changes the structural form and original connection state of the connection parts.

[0045] Figure 1 This is a flowchart of an embodiment of a method for evaluating the stiffness and monitoring the degradation of the connection nodes between corridors and towers. Figure 1 , this embodiment may include the following steps:

[0046] S1. Obtain a pre-established structural model that is identical to the target building structure.

[0047] S2. Determine the key degradation form of the connection point based on the structural model.

[0048] S3. Determine the sensitivity comfort index based on the structural model.

[0049] S4. Establish a connection point stiffness evaluation model based on the key degradation forms and sensitive comfort indicators of the connection points.

[0050] S5. Obtain the sensitive comfort index of the target building through on-site comfort testing.

[0051] S6. Input the sensitive comfort index of the target building into the connection point stiffness evaluation model to obtain the stiffness degradation coefficient of the corridor connection node of the target building.

[0052] S7. Based on the stiffness degradation coefficient of the corridor connection nodes, perform stiffness assessment and degradation monitoring on the target building.

[0053] It will be appreciated that this embodiment first obtains a pre-established structural model identical to the target building structure, determines the key degradation forms of the connection points based on the structural model, and determines the sensitive comfort index based on the structural model. Then, a connection point stiffness assessment model is established based on the key degradation forms of the connection points and the sensitive comfort index. Finally, the sensitive comfort index of the target building is obtained through on-site comfort testing, and the sensitive comfort index of the target building is input into the connection point stiffness assessment model to obtain the stiffness degradation coefficient of the corridor connection node of the target building. In this embodiment, the key degradation forms of the connection nodes and the sensitive comfort index are determined through simulation analysis of the existing structural model to obtain the connection node stiffness assessment model. The sensitive comfort index of the target building is obtained through on-site comfort testing, and the stiffness degradation coefficient of the corridor connection node of the target building is obtained based on the connection node stiffness assessment model. Based on the stiffness degradation coefficient of the corridor connection node, the stiffness assessment and degradation monitoring of the target building are performed. There is no need to change the structural form and original connection status of the connection parts, which solves the problem of low accuracy in predicting the stiffness of the connection parts due to the use of direct measurement methods that change the structural form and original connection status of the connection parts.

[0054] Preferably, step S2 includes:

[0055] Determine the key stiffness form of the connection node based on the structural model;

[0056] Determine the key degradation locations of connection nodes based on the structural model;

[0057] According to the key stiffness form and key degradation position of the connection node, the key degradation form of the connection point is determined.

[0058] Preferably, the key stiffness forms of the connection node include: translation stiffness and rotation stiffness.

[0059] Preferably, the key degradation positions of the connection nodes include: the floors and beam end positions of the connection nodes.

[0060] It is understood that determining the key stiffness form of the connection nodes includes: zeroing the translational and rotational stiffness coefficients in the three directions of all corridor connection nodes; comparing the degree of change in the vertical natural frequency and acceleration of the corridor after the six stiffness forms of the connection nodes are degraded; and determining the key stiffness form of the connection node that has the greatest impact on the vertical natural frequency and acceleration of the corridor. In some embodiments, the key stiffness form of the connection node is the rotational stiffness in the direction perpendicular to the corridor span.

[0061] Determining the critical degradation location of the connection node includes: adjusting the key stiffness form coefficients of different floors and connecting beam ends of the corridor to zero; comparing the degree of change in the corridor vibration acceleration after the key stiffness form degradation of the connection nodes at different locations; and determining the critical degradation location of the connection node that has the greatest impact on the vibration acceleration. In some embodiments, the critical degradation location of the connection node is the connecting beam end on the same side of the ground floor perpendicular to the corridor span. In some embodiments, the key degradation form of the connection node is the rotational stiffness of the connecting beam end on the same side of the ground floor perpendicular to the corridor span.

[0062] Preferably, step S3 includes:

[0063] Obtain the degree of change of the vertical natural frequency and vertical acceleration of the corridor under different key stiffness forms of the connection nodes;

[0064] Obtain the degree of change of vertical vibration acceleration at different locations of the corridor under different key degradation positions of the connection nodes;

[0065] The sensitive comfort index is determined based on the degree of change of the vertical natural frequency of the corridor, the degree of change of the vertical acceleration of the corridor, and the degree of change of the vertical vibration acceleration at different positions of the corridor.

[0066] Preferably, step S4 includes:

[0067] Obtain the stiffness degradation coefficient of the key degradation form of the connection point;

[0068] Normalize the sensitive comfort index;

[0069] The mapping relationship between the stiffness degradation coefficient of the key degradation form of the connection point and the normalized sensitive comfort index is determined through regression analysis, thereby establishing a connection point stiffness evaluation model.

[0070] Preferably, step S5 includes:

[0071] The measured values ​​of the sensitive comfort index of the target building are obtained by arranging acceleration sensors on the key degraded floors of the corridor of the target building;

[0072] By conducting comfort simulation analysis on the measured values ​​of sensitive comfort index, the sensitive comfort index of the target building connection node with no stiffness degradation and the sensitive comfort index of the target building connection node with complete stiffness degradation are obtained.

[0073] Preferably, step S6 includes:

[0074] Calculate the normalized sensitive comfort index based on the sensitive comfort index of the target building connection node with undegraded stiffness and the sensitive comfort index of the target building connection node with completely degraded stiffness;

[0075] The normalized sensitive comfort index is substituted into the connection point stiffness evaluation model to obtain the stiffness degradation coefficient of the corridor connection node of the target building.

[0076] It can be understood that the determination of the sensitive comfort index is specifically as follows: comparing the vibration characteristics and acceleration changes of the corridor under different connection node degradation conditions; determining the sensitive comfort index a to the connection node stiffness degradation. k In some embodiments, the sensitive comfort index is the peak value of the acceleration power spectrum of the bottom floor of the corridor.

[0077] Establish a connection node stiffness evaluation model, specifically:

[0078] Obtain the stiffness degradation coefficient matrix k of the key degradation form;

[0079] Through comfort analysis, the sensitive comfort index matrix a of different degradation conditions is obtained k ;

[0080] The normalized value matrix η of the sensitive comfort index is obtained by normalization k ;

[0081] The mapping relationship between the stiffness degradation coefficient of key degradation forms and the normalized sensitive comfort index is established through regression analysis, and the stiffness evaluation model of the connection node is determined.

[0082] In some embodiments, the stiffness degradation coefficient matrix k of the key degradation form is:

[0083] k=[k1 k2 L k i L k m ]

[0084] Where k i is the stiffness degradation coefficient of the i-th working condition.

[0085] In some embodiments, the sensitivity comfort index matrix a of different degradation conditions k for:

[0086] a k =[a1 a2 L a i L a m ]

[0087] Where ai is the sensitive comfort index value of the i-th working condition.

[0088] In some embodiments, the normalized value matrix η of the sensitivity comfort index is k for:

[0089] η k =[η1 η2 L η i L η m ]

[0090] Among them, η i The calculation formula is:

[0091]

[0092] Where η i The stiffness degradation coefficient of the connection node is k i Normalized sensitivity comfort index; The stiffness degradation coefficient of the connection node is k i Sensitive comfort index; a k＝0 is the sensitive comfort index when the stiffness of the connection node is not degraded; a k＝1 It is a sensitive comfort index for complete degradation of connection node stiffness.

[0093] In some embodiments, the connection node stiffness evaluation model is:

[0094]

[0095] Where β1 and β2 are the unknown parameters of the connection node stiffness evaluation model.

[0096] The sensitive comfort index of the target building is obtained through on-site comfort testing, specifically:

[0097] Accelerometers are placed on the key degraded floors of the corridor, and the actual measured values ​​of sensitive comfort indicators are obtained through on-site comfort tests.

[0098] Through the comfort simulation analysis, the sensitive comfort index a of the connection node stiffness without degradation and complete degradation is obtained respectively. k＝0 、a k＝1 .

[0099] The sensitive comfort index of the target building is input into the connection point stiffness evaluation model to obtain the stiffness degradation coefficient of the corridor connection node of the target building, which is specifically:

[0100] Calculate the normalized sensitivity comfort index η;

[0101] The normalized sensitive comfort index is substituted into the connection node stiffness evaluation model to obtain the actual value of the corridor connection node stiffness degradation coefficient, thereby realizing the degradation monitoring of the corridor connection node stiffness.

[0102] The present invention also provides a device for evaluating the stiffness and monitoring the degradation of the connection nodes between the corridor and the tower, which is used to implement the above method embodiment. Figure 2 This is a structural diagram of an embodiment of a device for evaluating stiffness and monitoring degradation of a connection node between a corridor and a tower according to the present invention. Figure 2As shown, the device for assessing stiffness and monitoring degradation of the connection nodes between corridors and towers in this embodiment includes a processor 21 and a memory 22, wherein the processor 21 is connected to the memory 22. The processor 21 is used to call and execute a program stored in the memory 22; the memory 22 is used to store the program, which is used to at least execute the method for assessing stiffness and monitoring degradation of the connection nodes between corridors and towers in the above embodiment.

[0103] The specific implementation plan of the corridor and tower connection node stiffness assessment and degradation monitoring equipment provided in the embodiments of the present application can refer to the implementation plan of the corridor and tower connection node stiffness assessment and degradation monitoring method of any of the above embodiments, which will not be repeated here.

[0104] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0105] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" is at least two.

[0106] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention pertain.

[0107] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0108] Those skilled in the art will understand that all or part of the steps in the method of the above embodiment can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0109] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing module, or each unit may exist physically separately, or two or more units may be integrated into a single module. The aforementioned integrated modules may be implemented in the form of hardware or in the form of software functional modules. If the integrated modules are implemented in the form of software functional modules and sold or used as independent products, they may also be stored in a computer-readable storage medium.

[0110] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0111] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0112] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for evaluating stiffness and monitoring degradation of the connection nodes between corridors and towers, characterized in that: include: Obtain a pre-built structural model that is identical to the target building structure; Determining the key stiffness form of the connection node according to the structural model; determining key degradation locations of connection nodes according to the structural model; Determining a key degradation form of the connection node according to the key stiffness form of the connection node and the key degradation position of the connection node; Obtain the degree of change of the vertical natural frequency and vertical acceleration of the corridor under different key stiffness forms of the connection nodes; Obtain the degree of change of vertical vibration acceleration at different locations of the corridor under different key degradation positions of the connection nodes; Determining a sensitivity comfort index according to a degree of change in the vertical natural frequency of the corridor, a degree of change in the vertical acceleration of the corridor, and a degree of change in the vertical vibration acceleration at different locations of the corridor; Obtaining the stiffness degradation coefficient of the key degradation form of the connection node; performing normalization processing on the sensitive comfort index; Determining the mapping relationship between the stiffness degradation coefficient of the key degradation form of the connection node and the normalized sensitive comfort index through regression analysis, thereby establishing a connection node stiffness evaluation model; Obtaining a measured value of a sensitive comfort index of the target building by arranging acceleration sensors on key degraded floors of the corridor of the target building; By performing a comfort simulation analysis on the measured values ​​of the sensitive comfort index, a sensitive comfort index when the stiffness of the target building connection node is not degraded and a sensitive comfort index when the stiffness of the target building connection node is completely degraded are obtained; Calculating a normalized sensitive comfort index according to the sensitive comfort index of the target building connection node when the stiffness is not degraded and the sensitive comfort index of the target building connection node when the stiffness is completely degraded; Substituting the normalized sensitive comfort index into the connection node stiffness evaluation model to obtain the corridor connection node stiffness degradation coefficient of the target building; According to the stiffness degradation coefficient of the corridor connection node, the stiffness evaluation and degradation monitoring of the target building are performed.

2. The method according to claim 1, characterized in that The key stiffness forms of the connection node include: translational stiffness and rotational stiffness.

3. The method according to claim 2, characterized in that The key degradation positions of the connection nodes include: the floor and beam end positions of the connection nodes.

4. A device for evaluating stiffness and monitoring degradation of the connection nodes between corridors and towers, characterized in that: The device comprises a processor and a memory, wherein the processor is connected to the memory: The processor is configured to call and execute the program stored in the memory; The memory is used to store the program, and the program is used at least to execute the corridor and tower connection node stiffness assessment and degradation monitoring method described in any one of claims 1-3.

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