A safety evaluation method, device and equipment of a space truss structure and a medium

Abstract

The application discloses a kind of safety evaluation method, device, equipment and medium of net rack structure. The method comprises: according to the real-time measurement value of the local unit section of each tower component in the net rack structure to be measured and / or the overall unit section, the damage factor corresponding to each tower component is calculated;According to the damage factor corresponding to each tower component, the safety state value of each tower component under the target working condition is calculated;The distribution function formed by the safety state value of each tower component is normalized, and the failure probability of the net rack structure to be measured under the target working condition is calculated according to the normalized processing function obtained by processing. By adopting the above technical scheme, a method for safety evaluation of the overall net rack structure in the case of damage or failure of the local component of the net rack structure is proposed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of safety evaluation of space truss structure, and particularly relates to a safety evaluation method, device, equipment and medium of space truss structure. BACKGROUND

[0002] The space truss structure is widely used in large engineering structures such as gymnasiums and opera houses due to its good seismic resistance and integrity. However, the steel structural members in the space truss structure lack durability, and if the steel structural members are corroded, it will affect the safety of the overall space truss structure. Therefore, safety evaluation needs to be carried out during the use of the overall space truss structure to ensure the normal use of the overall space truss structure.

[0003] In the existing safety evaluation method of space truss structure based on the finite element method, the judgment standard for the instability of the overall space truss structure is that the stress value of part of the nodes in the space truss structure exceeds the allowable stress value.

[0004] However, since the space truss structure is a statically indeterminate structure, the safety of the space truss structure cannot be directly evaluated by judging the stress value of the nodes. SUMMARY

[0005] The present application provides a safety evaluation method, device, equipment and medium of space truss structure, and proposes a method for safety evaluation of the overall space truss structure in the case that there is damage or failure in the local components of the space truss structure.

[0006] According to one aspect of the present application, a safety evaluation method of space truss structure is provided, which comprises:

[0007] According to the real-time measurement values of the local element sections of each tower member in the to-be-tested space truss structure and / or the overall element sections, the damage factors corresponding to each tower member are calculated;

[0008] According to the damage factors corresponding to each tower member, the safety state values of each tower member under the target working condition are calculated;

[0009] The distribution function composed of the safety state values of each tower member is normalized, and the failure probability of the to-be-tested space truss structure under the target working condition is calculated according to the normalized processing function obtained by processing.

[0010] According to another aspect of the present application, a safety evaluation device of space truss structure is provided, which comprises:

[0011] The damage factor calculation module is configured to calculate the damage factors corresponding to each tower member according to the real-time measurement values of the local element sections of each tower member in the to-be-tested space truss structure and / or the overall element sections;

[0012] The safety state value calculation module is configured to calculate the safety state value of each tower component under the target working condition according to the damage factor corresponding to each tower component.

[0013] The failure probability calculation module is configured to normalize the distribution function composed of the safety state values of the tower components, and calculate the failure probability of the to-be-tested grid structure under the target working condition according to the normalized processing function obtained by the processing.

[0014] According to another aspect of the present application, an electronic device is provided, which comprises:

[0015] at least one processor; and

[0016] a memory in communication with the at least one processor; wherein

[0017] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to execute the safety evaluation method of the grid structure according to any one of the embodiments of the present application.

[0018] According to another aspect of the present application, a computer readable storage medium is provided, which stores computer instructions for enabling a processor to execute the safety evaluation method of the grid structure according to any one of the embodiments of the present application when executed by the processor.

[0019] The technical solution of the embodiments of the present application can realize the safety evaluation of the overall grid structure and obtain an intuitive safety evaluation result in the case that the local components of the grid structure are damaged or failed, by calculating the damage factor corresponding to each tower component according to the real-time measurement value of the relevant section of each tower component of the grid structure, further calculating the safety state value, and obtaining the normalized processing function, and then calculating the failure probability of the to-be-tested grid structure under the target working condition.

[0020] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0022] Figure 1is a flow chart of a safety evaluation method of a grid structure according to an embodiment of the present application;

[0023] Figure 2 is a flow chart of a safety evaluation method of a grid structure according to an embodiment of the present application;

[0024] Figure 3 is a structural schematic diagram of a safety evaluation device of a grid structure according to an embodiment of the present application;

[0025] Figure 4 is a structural schematic diagram of an electronic device for implementing a safety evaluation method of a grid structure according to an embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to make the personnel in the technical field better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by the personnel in the field without creative labor should belong to the protection scope of the present application.

[0027] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be exchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to the clearly listed steps or units, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0028] Embodiment One

[0029] Figure 1 A flow chart of a safety evaluation method of a grid structure according to an embodiment of the present application is provided, and the present embodiment can be applicable to obtaining the failure probability of a grid structure to be measured under a target working condition through multi-step calculation according to the real-time measurement values of the relevant sections of each tower member in the grid structure. The method can be executed by a safety evaluation device of a grid structure, which can be realized in the form of hardware and / or software, and the safety evaluation device of the grid structure can be configured in a computer with data calculation function. As shown in the figure, the method comprises: Figure 1 ​

[0030] S110, calculate the damage factor corresponding to each tower member according to the real-time measurement value of the local unit section of each tower member in the to-be-tested grid structure, and / or the real-time measurement value of the overall unit section.

[0031] The grid structure can be understood as a large-span super-high-order statically indeterminate space structure formed by a plurality of rod members connected through nodes in a certain grid form.

[0032] Optionally, in the power scenario, the high-voltage tower is a spatial grid structure formed by a plurality of tower members connected through nodes in a certain grid form.

[0033] The section can refer to the connection section of the tower member and the node, or can refer to the connection section of the two tower members.

[0034] The real-time measurement value of the local unit section can refer to the real-time measurement value of one or more specific measurement sections of each tower member in the actual measurement requirement; the real-time measurement value of the overall unit section can refer to the average value of the real-time measurement values of all measurement sections in part of the structure or the whole structure of each tower member.

[0035] The position of the specific measurement section can be the main load-bearing area of the grid structure, or can be selected according to the actual needs of the measurement personnel and the actual situation of the grid structure, and the position of the measurement section is not limited here.

[0036] Optionally, the real-time measurement value of the local unit section and the real-time measurement value of the overall unit section can be obtained by manual measurement, or can be obtained by taking photos and analyzing, or can be measured by other section measurement methods, and the section measurement method is not limited here.

[0037] The damage factor can describe the damage situation of the grid structure. In order to ensure that the calculated damage factor can be applied to the safety evaluation of the overall grid structure, appropriate damage factor calculation parameters need to be selected. The inventors creatively propose to calculate the local unit section reduction value and / or the overall unit section reduction value by using the real-time measurement value of the local unit section of each tower member in the to-be-tested grid structure, and / or the real-time measurement value of the overall unit section, and use it as a damage factor calculation parameter. At the same time, combined with some damage evaluation parameters such as modal shape, damping, etc., the damage factor is calculated.

[0038] Among them, according to the real-time measurement value of the local unit section of each tower member in the to-be-tested grid structure, and / or the real-time measurement value of the overall unit section, the damage factor corresponding to each tower member is calculated, which can specifically include:

[0039] obtaining a real-time measurement value of the local unit section corresponding to the target tower component currently processed, and calculating a local unit section reduction value according to a numerical difference between the real-time measurement value of the local unit section and an ideal value of the local unit section;

[0040] obtaining a real-time measurement value of the overall unit section corresponding to the target tower component currently processed, and calculating an overall unit section reduction value according to a numerical difference between the real-time measurement value of the overall unit section and an ideal value of the overall unit section;

[0041] calculating the damage factor of the target tower component according to the local unit section reduction value and the overall unit section reduction value.

[0042] The advantage of such an arrangement is that by adding the local unit section reduction value and the overall unit section reduction value as calculation parameters when calculating the damage factor, the damage location can be clearly determined, and the damage factor has better intuitiveness and comprehensiveness.

[0043] S120, calculating a safety state value of each tower component under a target working condition according to the damage factor corresponding to each tower component.

[0044] The target working condition can refer to the working state of the grid structure for calculation, and can include the working environment of the grid structure (such as temperature, wind speed, and other environmental conditions), the material condition of each tower component (such as rust, cracking, and other material conditions), and other working conditions.

[0045] Further, a finite element simulation model matching the target working condition needs to be established, and after inputting the damage factor into the finite element simulation model, the member resistance and the member bearing capacity of each tower component under the target working condition can be obtained, and the safety state value of each tower component under the target working condition can be calculated through the member resistance and the member bearing capacity of each tower component under the target working condition.

[0046] Specifically, the finite element simulation model is an ideal model that can solve the problem of the grid structure. Different grid structure problems can be analyzed by different analysis methods, and different analysis methods determine different finite element simulation models. A finite element model is often established by more than one type of unit, and the finite element simulation model is a mathematical model established based on the displacement of the structure.

[0047] The safety state value can be used to evaluate the operation reliability of each tower component under the target working condition, and the greater the safety state value of the tower component, the higher the operation reliability of the tower component.

[0048] In one specific embodiment, if the safety state value is equal to 0, it can be determined that the tower component has reached the limit state; if the safety state value is greater than 0, it can be determined that the tower component is in a reliable state, and the greater the safety state value, the higher the reliability; if the safety state value is less than 0, it can be determined that the tower component is in a failure state, i.e. the tower component is in an unreliable state.

[0049] In S130, the distribution function composed of the safety state values of each tower component is normalized, and the failure probability of the to-be-tested grid structure under the target working condition is calculated according to the normalized processing function obtained by the processing.

[0050] If the distribution function composed of the safety state values of each tower component conforms to the standard normal distribution, the failure probability of the to-be-tested grid structure under the target working condition can be directly calculated. Specifically, when the rod structure is in the limit state or the failure state, the probability that the rod structure cannot achieve the expected purpose can be referred to as the failure probability.

[0051] In this embodiment, an optional failure probability calculation method when the distribution function composed of the safety state values conforms to the standard normal distribution will be exemplified:

[0052] Suppose M represents a discrete data set composed of the safety state values of each tower component, and p f represents the failure probability of the to-be-tested grid structure under the target working condition, f m (m) represents the probability density function of M, and F m (m) represents the distribution function of M, i.e. the state function of the grid structure.

[0053] Therefore, the calculation formula of the failure probability can be represented as:

[0054]

[0055] When M conforms to the normal distribution, the mean μ m and the standard deviation σ m of M can be used to represent the probability density function f m (m) of M.

[0056] That is, the calculation formula of f m (m) can be represented as:

[0057]

[0058] Two auxiliary functions and Φ(y) are further defined:

[0059]

[0060]

[0061] wherein, is a probability density function of a standard normal function, and Φ(y) is a probability distribution function of a standard normal function.

[0062] Further, the formula can be obtained:

[0063]

[0064]

[0065] Meanwhile, a variable β is introduced as a reliability index of the grid structure, and a calculation formula of β is:

[0066]

[0067] That is, the failure probability can be obtained:

[0068]

[0069] However, in actual engineering, the distribution function composed of the safety state values of the tower members is often not a standard normal distribution, and therefore, the distribution function composed of the safety state values of the tower members needs to be normalized to accurately calculate the failure probability of the grid structure under the target working condition.

[0070] In the related art, the normalization processing of the distribution function composed of the safety state values of the tower members can be realized by the JC method or the Box-Cox transformation method. In the present embodiment, the JC method is mainly used to realize the above normalization processing process.

[0071] Correspondingly, the normalization processing of the distribution function composed of the safety state values of the tower members, and the calculation of the failure probability of the grid structure to be measured under the target working condition according to the normalized processing function obtained by the processing can specifically include:

[0072] obtaining a current checking point, the current checking point having a preset initial value;

[0073] performing equivalent normalization processing on the distribution function composed of the safety state values at the current checking point to obtain an equivalent mean value and an equivalent standard deviation matched with the current normalized processing function obtained by the processing;

[0074] calculating a current reliability index matched with the current checking point according to the equivalent mean value and the equivalent standard deviation;

[0075] verifying whether the current reliability index satisfies a reliability condition;

[0076] If yes, the failure probability of the to-be-tested grid structure under the target working condition is calculated according to the current reliability index; if no, a new current checking point is calculated according to the current reliability index.

[0077] The operation of performing equivalent normalization processing on the distribution function composed of the safety state values of each tower member at the current checking point is returned to be performed until the failure probability is successfully calculated.

[0078] In order to realize the target of normalizing the distribution function composed of the safety state values of each tower member, the target checking point needs to be obtained first. The target checking point can be understood as a point on both the standard normal distribution function and the distribution function composed of the safety state values of each tower member. At the target checking point, the probability distribution function value of the equivalent normalized safety state value is equal to the probability distribution function value of the safety state value before normalization. After obtaining the target checking point, the distribution function composed of the safety state values can be normalized by the target checking point.

[0079] The target checking point cannot be directly obtained. In order to obtain the target checking point, a point on the distribution function composed of the safety state values needs to be selected as the current checking point first.

[0080] When the current checking point is not the target checking point, the new current checking point can be calculated using the current reliability index, until the new current checking point meets the reliability condition, and then the new current checking point can be used as the target checking point for further failure probability calculation.

[0081] The technical scheme of the embodiment of the present application can realize safety evaluation of the overall grid structure and obtain an intuitive safety evaluation result in the case that there is damage or failure in the local components of the grid structure, by calculating the damage factor corresponding to each tower member according to the real-time measurement value of the related section of each tower member in the grid structure, further calculating the safety state value, and obtaining the normalization processing function, and then calculating the failure probability of the to-be-tested grid structure under the target working condition.

[0082] It should be noted that the technical scheme of the embodiment of the present application calculates the damage factor of each tower member by using the overall unit section reduction value and at least one local unit section reduction value of the tower member, which intuitively quantifies the damage of the tower member in the running process from the shape loss of the tower member. The safety state value calculated finally can accurately reflect the actual running safety of each tower member, and then a more accurate and reliable safety evaluation result of the overall grid structure can be obtained.

[0083] Embodiment two

[0084] Figure 2A flowchart of a safety evaluation method of a grid structure is provided for the second embodiment of the present application. The embodiment further specifies the safety state value calculation process in the safety evaluation method of the grid structure on the basis of the above-mentioned embodiment. As shown in Figure 2 the method comprises:

[0085] S210, calculating damage factors corresponding to each tower member according to real-time measurement values of local element sections and / or overall element sections of each tower member in the grid structure to be measured.

[0086] S220, inputting the damage factors corresponding to each tower member into a finite element simulation model matched with the target working condition respectively to obtain member resistances and member bearing capacities of each tower member under the target working condition.

[0087] S230, calculating safety state values of each tower member under the target working condition according to the member resistances and the member bearing capacities of each tower member under the target working condition.

[0088] The calculation of the safety state values of each tower member under the target working condition according to the member resistances and the member bearing capacities of each tower member under the target working condition can specifically include:

[0089] calculating differences between the member resistances and the member bearing capacities of each tower member under the target working condition respectively as the safety state values of each tower member under the target working condition.

[0090] The greater the safety state value of the tower member is, the higher the operation reliability of the tower member is.

[0091] In a specific embodiment, Pi can represent the member resistance of tower member i under the target working condition, Qi can represent the member bearing capacity of the tower member under the target working condition, and Zi can represent the safety state value of tower member i under the target working condition. The calculation formula of the safety state value can be represented as:

[0092] Zi = Ri - Qi

[0093] If Zi = 0, it can be judged that the tower member i has reached the limit state; if Zi > 0, it can be judged that the tower member i is in a reliable state; if Zi < 0, it can be judged that the tower member i is in a failure state, i.e., the tower member i is in an unreliable state.

[0094] Wherein, i∈[2, n], n is the total number of tower components included in the to-be-tested network structure. By performing S230, the corresponding safety state value is calculated for each tower component respectively, and a discrete data set of n values consisting of Z1, Z2,..., Zn can be obtained. Correspondingly, after normalizing the distribution function corresponding to the above discrete data set, the failure probability of the to-be-tested network structure can be calculated based on the mean and standard deviation of the normalized processing function.

[0095] S240, obtain a current checking point, the current checking point has a preset initial value.

[0096] As mentioned above, the process of normalization processing is to obtain a target checking point that meets the conditions through multiple iterations. Therefore, an initialized current checking point can be obtained first, and the target checking point required can be obtained by iteration starting from the initialized current checking point.

[0097] Optionally, any one of Z1, Z2,..., Zn can be selected as the initialized current checking point, or the initialized current checking point can also be approximately estimated by statistical methods.

[0098] In a specific embodiment, assuming that the Xth checking point is determined in the random variable (Z1, Z2,..., Zn) consisting of the safety state values of each tower component under the target working condition, the first X-1 checking points are preferred to be obtained, and then the Xth checking point is calculated using the first X-1 checking points. Specifically, the X-1 safety state values Z1 to Zx-1 can be accumulated and summed, and the mean determined by the accumulated sum result is used as the first X-1 checking points respectively. Wherein, X can be less than or equal to n+1.

[0099] Further, the initialized current checking point can be determined based on the above estimated first X-1 checking points, and the limit state equation can be expressed as:

[0100]

[0101] Wherein, the limit state equation is a known equation, and the first X-1 checking points are is the initialized current checking point to be estimated.

[0102] Correspondingly, the derivative of is processed, and the following equation can be obtained:

[0103]

[0104] Further, the derivative of After the derivative equation of the limit state equation is brought in, the initialized current checking point can be obtained

[0105] S250, at the current checking point, the distribution function composed of each safety state value is equivalently normalized to obtain an equivalent mean and an equivalent standard deviation matched with the processed current normalized processing function.

[0106] In a specific embodiment, assuming that the coordinates of the current checking point are Z * , the equivalent mean matched with the current normalized processing function can be represented by μ Z , and the equivalent standard deviation matched with the current normalized processing function can be represented by σ Z . Accordingly, μ Z and σ Z can be calculated according to the following formula.

[0107] μ z = Z * - Φ -1 [ F Z (Z * ) ] σ z

[0108]

[0109] wherein the distribution function F Z ( ) composed of each safety state value Z, F Z (Z * ) is the function value of the distribution function at the current checking point, and the value is equivalent to the function value of the normal function Φ ( ) determined by the equivalent mean μ Z and the equivalent standard deviation σ Z , considering the characteristics of the checking point. Similarly, the probability density function of the distribution function F Z ( ) is f Z ( ), and f Z (Z * ) is the probability density value of the probability density function at the current checking point, and the value is equivalent to the probability density function function value of the normal function Φ ( ) determined by the equivalent mean μ Z and the equivalent standard deviation σ Z .

[0110] Based on the above formula, the matched equivalent mean μ * and the equivalent standard deviation σ Z can be calculated based on the current checking point Z Z .

[0111] ​S260, calculating a current reliability index matched with the current checking point according to the equivalent mean value and the equivalent standard deviation.

[0112] Specifically, the current reliability index β matched with the current checking point Z can be calculated according to β = μ Z / σ Z . *

[0113] S270, verifying whether a difference value between the current reliability index and a historical reliability index calculated last time is less than or equal to a preset threshold, if yes, determining that the reliability condition is satisfied, and performing S280; otherwise, determining that the reliability condition is not satisfied, and performing S290.

[0114] Wherein, the historical reliability index corresponding to the current reliability index calculated for the first time can be initialized as 0, and the β value calculated last time can be used from the second time when the current reliability index is calculated. The threshold can be a preset minimum value ε.

[0115] S280, calculating a failure probability of the network structure under the target working condition according to the current reliability index.

[0116] Wherein, the failure probability of the network structure under the target working condition can be calculated according to the current reliability index, which can specifically include:

[0117] According to the formula:

[0118] p f = 1 - Φ (β)

[0119] calculating the failure probability p f of the network structure under the target working condition, wherein Φ (.) is a distribution function of a standard normal distribution, and β is the current reliability index when the reliability condition is determined to be satisfied.

[0120] S290, calculating a new current checking point according to the current reliability index, and returning to perform S250 after the new current checking point is calculated.

[0121] Specifically, the new current checking point Z can be calculated according to the formula: Z * = μ Z + β * σ Z . *

[0122] ​​The technical scheme of the embodiment of the present application solves the problem that the failure probability of the net rack structure is difficult to calculate due to the fact that the distribution function composed of the safety state values of the tower members often does not meet the standard normal distribution, by normalizing the distribution function composed of the safety state values of the tower members.

[0123] Embodiment three

[0124] Figure 3 A structural schematic diagram of a safety evaluation device for a net rack structure according to Embodiment three of the present application is shown in FIG. 3. Figure 3 As shown in the figure, the device comprises a damage factor calculation module 310, a safety state value calculation module 320, and a failure probability calculation module 330.

[0125] The damage factor calculation module 310 is configured to calculate the damage factor corresponding to each tower member according to the real-time measurement value of the local unit section and / or the overall unit section of each tower member in the net rack structure to be measured.

[0126] The safety state value calculation module 320 is configured to calculate the safety state value of each tower member under the target working condition according to the damage factor corresponding to each tower member.

[0127] The failure probability calculation module 330 is configured to normalize the distribution function composed of the safety state values of each tower member, and calculate the failure probability of the net rack structure to be measured under the target working condition according to the normalized processing function obtained by processing.

[0128] The technical scheme of the embodiment of the present application can realize safety evaluation of the overall net rack structure and obtain an intuitive safety evaluation result in the case that there is damage or failure in the local component of the net rack structure, by calculating the damage factor corresponding to each tower member according to the real-time measurement value of the relevant section of each tower member in the net rack structure, further calculating the safety state value, and obtaining the normalized processing function, and then calculating the failure probability of the net rack structure to be measured under the target working condition.

[0129] On the basis of the above-mentioned embodiments, the damage factor calculation module 310 can be specifically configured to:

[0130] obtain the real-time measurement value of the local unit section corresponding to the target tower member currently processed, and calculate the local unit section reduction value according to the numerical difference between the real-time measurement value of the local unit section and the ideal value of the local unit section;

[0131] obtain the real-time measurement value of the overall unit section corresponding to the target tower member currently processed, and calculate the overall unit section reduction value according to the numerical difference between the real-time measurement value of the overall unit section and the ideal value of the overall unit section;

[0132] According to the local unit cross-section reduction value and the overall unit cross-section reduction value, a damage factor of the target tower component is calculated.

[0133] On the basis of the above embodiments, the safety state value calculation module 320 can include:

[0134] The member resistance and member bearing capacity acquisition unit is configured to input the damage factors corresponding to the tower components respectively into the finite element simulation model matched with the target working condition, and acquire the member resistance and member bearing capacity of each tower component under the target working condition.

[0135] The safety state value calculation unit is configured to calculate the safety state value of each tower component under the target working condition according to the member resistance and member bearing capacity of each tower component under the target working condition.

[0136] On the basis of the above embodiments, the safety state value calculation unit can be specifically configured to:

[0137] The difference between the member resistance and the member bearing capacity of each tower component under the target working condition is calculated as the safety state value of each tower component under the target working condition.

[0138] The greater the safety state value of the tower component is, the higher the operation reliability of the tower component is.

[0139] On the basis of the above embodiments, the failure probability calculation module 330 can include:

[0140] The current checking point acquisition unit is configured to acquire a current checking point, and the current checking point has a preset initial value.

[0141] The equivalent mean value and equivalent standard deviation acquisition unit is configured to perform equivalent normalizing processing on the distribution function composed of the safety state values at the current checking point to obtain an equivalent mean value and an equivalent standard deviation matched with the current normalizing processing function obtained by the processing.

[0142] The sensitivity coefficient and reliability index calculation unit is configured to calculate a current reliability index matched with the current checking point according to the equivalent mean value and the equivalent standard deviation.

[0143] The reliability index verification unit is configured to verify whether the current reliability index satisfies a reliability condition.

[0144] If yes, the failure probability of the to-be-tested grid structure under the target working condition is calculated according to the current reliability index; if no, a new current checking point is calculated according to the current reliability index.

[0145] An equivalent normalizing processing unit is configured to return to perform an operation of performing equivalent normalizing processing on a distribution function composed of each of the safety state values at the current checking point until a failure probability is successfully calculated.

[0146] On the basis of the above-mentioned embodiments, the reliability index verifying unit can be specifically configured to:

[0147] verify whether a difference value between the current reliability index and a historical reliability index calculated last time is less than or equal to a preset threshold value;

[0148] if yes, it is determined that the reliability condition is met, otherwise, it is determined that the reliability condition is not met.

[0149] On the basis of the above-mentioned embodiments, the reliability index verifying unit can be further specifically configured to:

[0150] according to the formula:

[0151] p f =1-Φ(β)

[0152] calculate a failure probability p of the grid structure under test under a target working condition f , wherein Φ(.) is a distribution function of a standard normal distribution, and β is a current reliability index.

[0153] The safety evaluation device for the grid structure provided in the embodiments of the present application can execute the safety evaluation method for the grid structure provided in any of the embodiments of the present application, and has the corresponding function modules and beneficial effects of the execution method.

[0154] Embodiment Four

[0155] Figure 4 A structural schematic diagram of an electronic device 40 that can be used to implement embodiments of the present application is shown. The electronic device is intended to represent various forms of digital computers, such as laptops, desktops, tablets, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular telephones, smart phones, wearable devices (e.g., headsets, glasses, watches, etc.), and other similar computing devices. The components shown here, their connections and relationships, and their functions, are meant to be examples only, and are not intended to limit the implementations of the present application described and / or claimed in this document.

[0156] As Figure 4As shown, the electronic device 40 includes at least one processor 41, and a memory, such as a read-only memory (ROM) 42, a random access memory (RAM) 43, etc., connected to the at least one processor 41 in communication. The memory stores computer programs executable by the at least one processor, and the processor 41 can perform various appropriate actions and processes according to the computer programs stored in the read-only memory (ROM) 42 or loaded from the storage unit 48 into the random access memory (RAM) 43. In the RAM 43, various programs and data required for the operation of the electronic device 40 can also be stored. The processor 41, the ROM 42, and the RAM 43 are connected to each other through a bus 44. An input / output (I / O) interface 45 is also connected to the bus 44.

[0157] Various components in the electronic device 40 are connected to the I / O interface 45, including an input unit 46, such as a keyboard, a mouse, etc., an output unit 47, such as various types of displays, speakers, etc., a storage unit 48, such as a magnetic disk, an optical disk, etc., and a communication unit 49, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 49 allows the electronic device 40 to exchange information / data with other devices through a computer network, such as the Internet, and / or various telecommunications networks.

[0158] The processor 41 can be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the processor 41 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 41 performs various methods and processes described above, such as the safety assessment method of the grid structure as described in embodiments of the present application. That is:

[0159] According to the real-time measurement values of the local element sections of each tower member in the grid structure to be tested, and / or the overall element section, the damage factors respectively corresponding to each tower member are calculated;

[0160] According to the damage factors respectively corresponding to each tower member, the safety state values of each tower member under the target working condition are calculated;

[0161] The distribution function composed of the safety state values of each tower member is normalized, and the failure probability of the grid structure to be tested under the target working condition is calculated according to the normalized processing function obtained by the processing.

[0162] In some embodiments, the method of safety evaluation of a space truss structure can be implemented as a computer program tangibly embodied in a computer readable storage medium, e.g., storage unit 48. In some embodiments, parts or all of the computer program can be loaded and / or installed onto electronic device 40 via, e.g., ROM 42 and / or communication unit 49. When the computer program is loaded onto RAM 43 and executed by processor 41, one or more steps of the method of safety evaluation of a space truss structure as described above can be performed. Alternatively, in other embodiments, processor 41 can be configured to perform the method of safety evaluation of a space truss structure by way of other means, e.g., by way of firmware.

[0163] Various implementations of the systems and techniques described above can be realized in digital electronic circuitry, integrated circuitry, specially designed application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include implementation in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device, and at least one output device.

[0164] Computer programs used to implement the methods of the application can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the computer program running on the processor implements the functions / operations specified in the flowcharts and / or the block diagrams.

[0165] In the context of the present application, a computer-readable storage medium can be a tangible medium that can contain or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. A computer-readable storage medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium can be a machine-readable signal medium. More specific examples of a machine-readable storage medium will include one or more lines of a program of instructions in a transitory signal, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0166] To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the electronic device. Other kinds of devices can be used to provide for interaction with a user as well; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form, including acoustic, speech, or tactile input.

[0167] The systems and techniques described here can be implemented in a computing system that includes a back end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front end component (e.g., a user computer having a graphical user interface or a Web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back end, middleware, or front end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0168] The computing system can include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system, to solve the defects of large management difficulty and weak business scalability in traditional physical host and VPS service.

[0169] It should be understood that the various forms of flow shown above can be used to reorder, add or delete steps. For example, each step described in the present application can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solutions of the present application can be achieved, which is not limited herein.

[0170] The above detailed description does not constitute a limitation on the scope of protection of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A method for safety evaluation of a space truss structure, characterized by, The method comprises the following steps: According to the real-time measurement values of the local unit sections and / or the overall unit sections of each tower member in the to-be-tested grid structure, the damage factors corresponding to each tower member are calculated; According to the damage factors corresponding to each tower member, the safety state values of each tower member under the target working condition are calculated; The distribution function composed of the safety state values of each tower member is normalized, and the failure probability of the to-be-tested grid structure under the target working condition is calculated according to the normalized processing function obtained by processing. According to the real-time measurement values of the local unit sections and / or the overall unit sections of each tower member in the to-be-tested grid structure, the damage factors corresponding to each tower member are calculated, which comprises: The real-time measurement value of the local unit section corresponding to the target tower member currently processed is obtained, and the local unit section reduction value is calculated according to the numerical difference between the real-time measurement value of the local unit section and the ideal value of the local unit section; The real-time measurement value of the overall unit section corresponding to the target tower member currently processed is obtained, and the overall unit section reduction value is calculated according to the numerical difference between the real-time measurement value of the overall unit section and the ideal value of the overall unit section; According to the local unit section reduction value and the overall unit section reduction value, the damage factor of the target tower member is calculated; According to the damage factors corresponding to each tower member, the safety state values of each tower member under the target working condition are calculated, which comprises: The damage factors corresponding to each tower member are respectively input into the finite element simulation model matched with the target working condition, and the member resistance and member bearing capacity of each tower member under the target working condition are obtained; According to the member resistance and member bearing capacity of each tower member under the target working condition, the safety state values of each tower member under the target working condition are calculated; According to the member resistance and member bearing capacity of each tower member under the target working condition, the safety state values of each tower member under the target working condition are calculated, which comprises: The difference between the member resistance and the member bearing capacity of each tower member under the target working condition is calculated as the safety state value of each tower member under the target working condition; The greater the safety state value of the tower member, the higher the operation reliability of the tower member.

2. The method of claim 1, wherein, The distribution function composed of the safety state values of each tower member is normalized, and the failure probability of the to-be-tested grid structure under the target working condition is calculated according to the normalized processing function obtained by processing, which comprises: A current checking point is obtained, and the current checking point has a preset initial value; At the current checking point, the distribution function composed of each safety state value is equivalently normalized to obtain an equivalent mean value and an equivalent standard deviation matched with the current normalized processing function obtained by processing; According to the equivalent mean value and the equivalent standard deviation, a current reliability index matched with the current checking point is calculated; It is verified whether the current reliability index meets the reliability condition; If yes, the failure probability of the to-be-tested grid structure under the target working condition is calculated according to the current reliability index; if no, a new current checking point is calculated according to the current reliability index. Return to execute at the current checking point, the operation of the equivalent normalization processing of the distribution function composed of each safety state value, until the failure probability is successfully calculated.

3. The method of claim 2, wherein, Verify whether the current reliability index meets the reliability condition, including: Verify whether the difference value between the current reliability index and the historical reliability index calculated last time is less than or equal to the preset threshold value; If yes, it is determined that the reliability condition is met, otherwise, it is determined that the reliability condition is not met.

4. The method of claim 2, wherein, According to the current reliability index, the failure probability of the grid structure under test in the target working condition is calculated, including: According to the formula: p f = 1 - Φ(β) Calculate the failure probability p of the test network structure under the target working condition f Wherein, Φ(.) is the distribution function of the standard normal distribution, and β is the current reliability index.

5. A safety assessment device for a space frame structure, characterized in that, Including: The damage factor calculation module is used for calculating the damage factor corresponding to each tower member according to the real-time measurement value of the local unit section and / or the overall unit section of each tower member in the grid structure under test. The safety state value calculation module is used for calculating the safety state value of each tower member in the target working condition according to the damage factor corresponding to each tower member. The failure probability calculation module is used for normalizing the distribution function composed of the safety state value of each tower member, and calculating the failure probability of the grid structure under test in the target working condition according to the normalized processing function obtained by processing. Wherein, the damage factor calculation module is specifically used for: Obtaining the real-time measurement value of the local unit section corresponding to the target tower member currently processed, and calculating the local unit section reduction value according to the numerical difference between the real-time measurement value of the local unit section and the ideal value of the local unit section. Obtaining the real-time measurement value of the overall unit section corresponding to the target tower member currently processed, and calculating the overall unit section reduction value according to the numerical difference between the real-time measurement value of the overall unit section and the ideal value of the overall unit section. According to the local unit section reduction value and the overall unit section reduction value, the damage factor of the target tower member is calculated. Wherein, the safety state value calculation module includes: The rod resistance and rod bearing capacity acquisition unit is used for inputting the damage factor corresponding to each tower member into the finite element simulation model matched with the target working condition respectively, and acquiring the rod resistance and rod bearing capacity of each tower member in the target working condition. The safety state value calculation unit is used for calculating the safety state value of each tower member in the target working condition according to the rod resistance and rod bearing capacity of each tower member in the target working condition. Wherein, the safety state value calculation unit is specifically used for: The difference value of the rod resistance minus the rod bearing capacity of each tower member in the target working condition is calculated as the safety state value of each tower member in the target working condition. Wherein, the greater the safety state value of the tower member, the higher the operation reliability of the tower member.

6. An electronic device, comprising: Including: At least one processor; And The memory is in communication connection with the at least one processor; wherein The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to implement the safety evaluation method of the grid structure in any one of claims 1-4.

7. A computer readable storage medium characterized in that, The computer readable storage medium stores computer instructions for causing the processor to implement the safety evaluation method of the grid structure according to any one of claims 1-4 when executed.

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