Methods and devices for assessing economic losses of buildings under the coupled effects of earthquakes and secondary fires

Abstract

This invention provides a method and apparatus for assessing the economic losses of buildings under the coupled effects of earthquakes and secondary fires, relating to the field of earthquake engineering technology. The method includes: obtaining the post-earthquake damage state of the building structure through nonlinear time history analysis based on earthquake motion input data; establishing a secondary fire CFD analysis model; determining the highest probability ignition point based on the location of flammable and explosive components and performing CFD analysis, outputting temperature field data and smoke propagation data for the structural solid part, non-structural solid part, and outer surface part of each component; analyzing the temperature field data to obtain the damage state of the structural and non-structural parts of the component; obtaining the smoke contamination status of the outer surface of the component based on the smoke propagation data, and then calculating the economic loss of each component, summing up the losses of all components to obtain the total building loss. This invention fills the technical gap in multi-hazard coupled loss assessment, providing a more effective and scientific decision-making basis for post-earthquake emergency response and reconstruction.

Description

Technical Field

[0001] This invention relates to the field of earthquake engineering technology, and in particular to a method and apparatus for assessing the economic losses of buildings under the coupled effects of earthquakes and secondary fires. Background Technology

[0002] Earthquakes are highly destructive natural disasters that often trigger a series of secondary disasters, among which fires are particularly common and extremely dangerous. Building upon the damage caused by an earthquake, the spread of fire is significantly accelerated by the destruction of fire-resistant structures, thus acting as a "booster" for the rapid spread of fire and further exacerbating the severity of the disaster.

[0003] However, most current research focuses on the analysis of single disasters, with relatively little research on damage assessment methods for multi-physics coupled events such as earthquakes and secondary fires. Disaster scenarios under such coupling are complex and variable, and the results of single-disaster studies cannot directly and accurately reflect the actual situation. Furthermore, existing economic loss models often fail to adequately consider the impact of non-structural components during the assessment process. Non-structural components, such as interior decorations, equipment, and furniture, can also suffer severe damage in earthquakes and fires, and may even trigger chain reactions leading to even greater losses.

[0004] Therefore, a reasonable and reliable assessment of the economic losses of buildings under the coupled effects of earthquakes and secondary fires is of great significance for earthquake damage assessment and post-earthquake emergency response. However, a method for assessing the economic losses of buildings under the coupled effects of earthquakes and secondary fires is currently lacking. Summary of the Invention

[0005] To address the current lack of a method for assessing building economic losses under the coupled effects of earthquakes and secondary fires, this invention provides a method and apparatus for assessing building economic losses under the coupled effects of earthquakes and secondary fires. The technical solution is as follows:

[0006] On the one hand, a method for assessing the economic losses of buildings under the coupled effects of earthquakes and secondary fires is provided. This method is implemented by a building economic loss assessment device and includes:

[0007] S1. Obtain a three-dimensional model of the building to be evaluated. Based on the three-dimensional model and the ground motion input data, obtain the post-earthquake damage data of the building through nonlinear time history analysis.

[0008] S2. Based on the post-earthquake damage data of the building, establish a secondary fire CFD analysis model, determine the highest probability ignition point, perform CFD analysis, and output the temperature field data of the structural solid part, the temperature field data of the non-structural solid part, and the smoke spread data of the outer surface part of each component of the building.

[0009] S3. Based on the temperature field data of the structural entity of each component, analyze the structure under temperature load and determine the damage state of the structural entity.

[0010] S4. Based on the temperature field data of the non-structural solid parts of each component, and combined with the material fire resistance threshold, determine the damage state of the non-structural solid parts.

[0011] S5. Based on the flue gas propagation data of the outer surface, obtain the flue gas contamination status of the outer surface of each component.

[0012] S6. Calculate the economic loss of each component based on the damage status of the structural solid parts, the damage status of the non-structural solid parts, and the smoke pollution status of the outer surface. Obtain the total building loss based on the economic losses of all components.

[0013] Optionally, the seismic motion input data in S1 includes: acceleration time history, seismic response spectrum, peak parameters, and duration.

[0014] Optionally, post-earthquake damage data for buildings may include: post-earthquake deformation, surface cracking, and damage data of building structural components.

[0015] S2 establishes a secondary fire CFD analysis model based on post-earthquake damage data of buildings, determines the highest probability ignition point, and performs CFD analysis, including:

[0016] S21. Establish a CFD analysis model for secondary fires based on post-earthquake component deformation, surface cracking, and damage data of building structures.

[0017] S22. Add material properties to building components, arrange combustibles, divide the grid, and determine the highest probability ignition point.

[0018] S23. Based on post-earthquake damage data of buildings, set combustion parameters and conduct CFD analysis.

[0019] Optionally, in S3, based on the temperature field data of the structural solid part of each component, the structure is analyzed under temperature load to determine the damage state of the structural solid part, including:

[0020] Based on the temperature field data of the structural entity of each component, the deformation of the structural entity under temperature load is analyzed, the mechanical damage state is determined based on the deformation, and the damage state of the structural entity is determined based on the mechanical damage state.

[0021] If the mechanical damage state is minor and the fire temperature is below 300℃, then the damage state of the structural entity is a burn rate of 10%.

[0022] If the mechanical damage state is moderate and the fire temperature is 300℃-500℃, then the damage state of the structural solid part is a burn rate of 40%.

[0023] If the mechanical damage state is severe and the fire temperature is 500℃-800℃, then the damage state of the structural entity is a burn rate of 70%.

[0024] If the mechanical damage state is complete damage and the fire temperature is 800℃-900℃, then the damage state of the structural entity is 100% burn rate.

[0025] Optionally, in S4, based on the temperature field data of the non-structural solid parts of each component and combined with the material's fire resistance threshold, the damage state of the non-structural solid parts is determined, including:

[0026] For the non-structural solid parts of the main load-bearing and structural components, the damage state is consistent with the burn rate of the corresponding structural solid parts.

[0027] For pipelines, furniture, and decorative materials, if the temperature exceeds the material's ignition temperature, it is considered to be ineffective.

[0028] For electronic devices, if the temperature exceeds the operating temperature, it is considered a failure.

[0029] For the insulation core material, if the temperature exceeds the material's ignition point, it is determined to be a combustion failure.

[0030] For exterior window glass, if the temperature reaches its softening point, it is considered a window failure.

[0031] For ventilation ducts, if the temperature exceeds the softening temperature of galvanized steel sheets, it is considered a structural collapse.

[0032] For the temperature sensing element of the fire sprinkler system, if the rated operating temperature is reached, the functional loss is recorded according to the actual start-up state.

[0033] For fire-retardant coatings, if the temperature exceeds its critical temperature and the duration exceeds its fire resistance limit, it is considered to have carbonized and failed.

[0034] Optionally, in S5, based on the flue gas propagation data of the outer surface portion, the flue gas fouling status of the outer surface of each component is obtained, including:

[0035] The FDS software was used to record the changes in the smoke layer height of each room in the building over time, and the relative height of the smoke layer was calculated. An element collector was created using the Revit API. Using the building elevation as the unit, all building elements on the floor were traversed. Based on the number of the smoke monitoring device, the boundary collector was used to obtain the boundary and height of the corresponding room, generating a bounding box model. Each component contained in the bounding box model was filtered to obtain the smoke contamination status of the outer surface of each component.

[0036] Optionally, in S6, the economic losses of each component are calculated based on the damage status of the structural solid parts, the damage status of the non-structural solid parts, and the smoke pollution status of the outer surface, including:

[0037] The calculation method for the economic loss of the structural entity is: burn-off rate × construction cost × component volume.

[0038] The calculation method for the economic loss of the main stress-bearing and load-bearing components of non-structural solid parts is: burn-off rate × construction cost × component volume.

[0039] The calculation method for economic losses of non-structural entities other than the main load-bearing and structural members is: (maximum construction cost × repair cost corresponding to the final damage level) / repair cost at the maximum damage level.

[0040] The calculation method for the economic loss of the outer surface of the component is: smoke-covered area × unit area cost.

[0041] The total loss of each component is calculated based on the economic losses of the structural solid parts, the non-structural solid parts, and the external surface, and the total loss does not exceed the construction cost of the complete component.

[0042] On the other hand, a device for assessing the economic losses of buildings under the coupled effects of earthquakes and secondary fires is provided. This device is applied to the method of assessing the economic losses of buildings under the coupled effects of earthquakes and secondary fires. The device includes:

[0043] The acquisition module is used to acquire a three-dimensional model of the building to be evaluated. Based on the three-dimensional model and the ground motion input data, it obtains the post-earthquake damage data of the building through nonlinear time history analysis.

[0044] A module is established to create a secondary fire CFD analysis model based on post-earthquake damage data of buildings, determine the highest probability ignition point for CFD analysis, and output temperature field data of the structural solid parts, temperature field data of the non-structural solid parts, and smoke spread data of the outer surface parts of each component of the building.

[0045] The damage state analysis module for structural solid parts is used to analyze the structure under temperature load based on the temperature field data of each structural solid part, and to determine the damage state of the structural solid parts.

[0046] The damage state analysis module for non-structural solid parts is used to determine the damage state of non-structural solid parts based on the temperature field data of the non-structural solid parts of each component and the material's fire resistance threshold.

[0047] The outer surface flue gas contamination analysis module is used to obtain the flue gas contamination status of the outer surface of each component based on the flue gas propagation data of the outer surface portion.

[0048] The output module is used to calculate the economic loss of each component based on the damage status of the structural solid parts, the damage status of the non-structural solid parts, and the smoke pollution status of the outer surface, and to obtain the total building loss based on the economic losses of all components.

[0049] Optionally, the ground motion input data includes: acceleration time history, ground motion response spectrum, peak parameters, and duration.

[0050] Optionally, post-earthquake damage data for buildings may include: post-earthquake deformation, surface cracking, and damage data of building structural components.

[0051] Create a module for further use in:

[0052] S21. Establish a CFD analysis model for secondary fires based on post-earthquake component deformation, surface cracking, and damage data of building structures.

[0053] S22. Add material properties to building components, arrange combustibles, divide the grid, and determine the highest probability ignition point.

[0054] S23. Based on post-earthquake damage data of buildings, set combustion parameters and conduct CFD analysis.

[0055] Optionally, the damage state analysis module for the structural entity is further used for:

[0056] Based on the temperature field data of the structural entity of each component, the deformation of the structural entity under temperature load is analyzed, the mechanical damage state is determined based on the deformation, and the damage state of the structural entity is determined based on the mechanical damage state.

[0057] If the mechanical damage state is minor and the fire temperature is below 300℃, then the damage state of the structural entity is a burn rate of 10%.

[0058] If the mechanical damage state is moderate and the fire temperature is 300℃-500℃, then the damage state of the structural solid part is a burn rate of 40%.

[0059] If the mechanical damage state is severe and the fire temperature is 500℃-800℃, then the damage state of the structural entity is a burn rate of 70%.

[0060] If the mechanical damage state is complete damage and the fire temperature is 800℃-900℃, then the damage state of the structural entity is 100% burn rate.

[0061] Optionally, the damage state analysis module for non-structural solid parts is further used for:

[0062] For the non-structural solid parts of the main load-bearing and structural components, the damage state is consistent with the burn rate of the corresponding structural solid parts.

[0063] For pipelines, furniture, and decorative materials, if the temperature exceeds the material's ignition temperature, it is considered to be ineffective.

[0064] For electronic devices, if the temperature exceeds the operating temperature, it is considered a failure.

[0065] For the insulation core material, if the temperature exceeds the material's ignition point, it is determined to be a combustion failure.

[0066] For exterior window glass, if the temperature reaches its softening point, it is considered a window failure.

[0067] For ventilation ducts, if the temperature exceeds the softening temperature of galvanized steel sheets, it is considered a structural collapse.

[0068] For the temperature sensing element of the fire sprinkler system, if the rated operating temperature is reached, the functional loss is recorded according to the actual start-up state.

[0069] For fire-retardant coatings, if the temperature exceeds its critical temperature and the duration exceeds its fire resistance limit, it is considered to have carbonized and failed.

[0070] Optionally, the flue gas contamination analysis module on the outer surface is further used for:

[0071] The FDS software was used to record the changes in the smoke layer height of each room in the building over time, and the relative height of the smoke layer was calculated. An element collector was created using the Revit API. Using the building elevation as the unit, all building elements on the floor were traversed. Based on the number of the smoke monitoring device, the boundary collector was used to obtain the boundary and height of the corresponding room, generating a bounding box model. Each component contained in the bounding box model was filtered to obtain the smoke contamination status of the outer surface of each component.

[0072] Optionally, the output module is further used for:

[0073] The calculation method for the economic loss of the structural entity is: burn-off rate × construction cost × component volume.

[0074] The calculation method for the economic loss of the main stress-bearing and load-bearing components of non-structural solid parts is: burn-off rate × construction cost × component volume.

[0075] The calculation method for economic losses of non-structural entities other than the main load-bearing and structural members is: (maximum construction cost × repair cost corresponding to the final damage level) / repair cost at the maximum damage level.

[0076] The calculation method for the economic loss of the outer surface of the component is: smoke-covered area × unit area cost.

[0077] The total loss of each component is calculated based on the economic losses of the structural solid parts, the non-structural solid parts, and the external surface, and the total loss does not exceed the construction cost of the complete component.

[0078] On the other hand, a building economic loss assessment device is provided, the building economic loss assessment device comprising: a processor; a memory, the memory storing computer-readable instructions, which, when executed by the processor, implement any of the methods described above for assessing building economic losses under the coupled effects of earthquakes and secondary fires.

[0079] On the other hand, a computer-readable storage medium is provided, wherein at least one instruction is stored therein, the at least one instruction being loaded and executed by a processor to implement any of the above-described methods for assessing economic losses of buildings under the coupled effects of earthquakes and secondary fires.

[0080] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following:

[0081] This invention provides a method for assessing the economic losses of buildings under the coupled effects of earthquakes and secondary fires. Through earthquake damage analysis and CFD fire analysis, it quantifies the economic losses of buildings under complex disasters, providing a scientific and accurate basis for decision-making in post-earthquake recovery and reconstruction. It is a more effective and scientific method for assessing the economic losses of buildings under the coupled effects of earthquakes and secondary fires. Attached Figure Description

[0082] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0083] Figure 1 This is a flowchart of a method for assessing the economic losses of buildings under the coupled effects of earthquakes and secondary fires, provided by an embodiment of the present invention.

[0084] Figure 2 This is a block diagram of a building economic loss assessment device under the coupled effects of earthquake and secondary fire, provided in an embodiment of the present invention.

[0085] Figure 3 This is a structural schematic diagram of a building economic loss assessment device provided in an embodiment of the present invention. Detailed Implementation

[0086] The technical solution of the present invention will now be described with reference to the accompanying drawings.

[0087] In embodiments of the present invention, words such as "exemplarily," "for example," etc., are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" in the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the word "exemplary" is intended to present the concept in a concrete manner. Furthermore, in embodiments of the present invention, the meaning expressed by "and / or" can be both, or either one.

[0088] In the embodiments of this invention, the terms "image" and "picture" may sometimes be used interchangeably. It should be noted that, without emphasizing the distinction between them, they convey the same meaning. Similarly, the terms "of," "corresponding (relevant)," and "corresponding" may sometimes be used interchangeably. It should be noted that, without emphasizing the distinction between them, they convey the same meaning.

[0089] In this embodiment of the invention, sometimes a subscript such as W1 may be written in a non-subscript form such as W1. When the difference is not emphasized, the meaning they express is the same.

[0090] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0091] This invention provides a method for assessing the economic losses of buildings under the coupled effects of earthquakes and secondary fires. This method can be implemented using a building economic loss assessment device, which can be a terminal or a server. Figure 1 The flowchart shown illustrates a method for assessing economic losses to buildings under the coupled effects of earthquakes and secondary fires. This method's processing flow may include the following steps:

[0092] S1. Obtain a three-dimensional model of the building to be evaluated. Based on the three-dimensional model and the ground motion input data, obtain the post-earthquake damage data of the building through nonlinear time history analysis.

[0093] The input data for ground motion may include: acceleration time history, ground motion response spectrum, peak parameters and duration, etc.

[0094] Post-earthquake damage data for buildings can include: component cracks, spalling, and residual deformation, etc.

[0095] In one feasible implementation, a three-dimensional model of the building is established based on finite element software, seismic motion parameters are input, and key damage parameters, including but not limited to inter-story drift angle and relative floor acceleration, are extracted through nonlinear time history analysis. Post-earthquake damage data, including component coordinates, damage level and geometric deformation data, are output.

[0096] S2. Based on the post-earthquake damage data of the building, establish a secondary fire CFD (Computational Fluid Dynamics) analysis model, determine the highest probability ignition point, perform CFD analysis, and output the temperature field data of the structural solid part, the temperature field data of the non-structural solid part, and the smoke spread data of the outer surface part of each component of the building.

[0097] Optionally, the step S2, which involves establishing a secondary fire CFD analysis model based on post-earthquake damage data of buildings and determining the highest probability ignition point for CFD analysis, may include the following steps S21-S23:

[0098] S21. Establish a CFD analysis model for secondary fires based on post-earthquake component deformation, surface cracking, and damage data of building structures.

[0099] S22. Add material properties to building components according to the actual situation, arrange combustibles, divide the grid, and determine the highest probability ignition point.

[0100] S23. Based on post-earthquake damage data of buildings, set combustion parameters and conduct CFD analysis.

[0101] Combustion parameters may include combustion reaction type, heat release rate, combustion curve, output parameters, and simulation time.

[0102] In one feasible implementation, a Building Information Modeling (BIM) model is constructed using Revit, and then the BIM model is converted into a Fire Dynamics Simulator (FDS) model. Material properties are added to building components according to the actual situation, combustible materials are arranged, a grid is generated, and the highest probability ignition point is determined. Based on post-earthquake damage data, combustion parameters are set, including combustion reaction type, heat release rate, combustion curve, output parameters, and simulation time, for CFD analysis.

[0103] S3. Based on the temperature field data of the structural entity of each component, analyze the structure under temperature load and determine the damage state of the structural entity.

[0104] Optionally, step S3 above may include:

[0105] Based on the temperature field data of the structural entity of each component, the deformation of the structural entity under temperature load is analyzed, the mechanical damage state is determined based on the deformation, and the damage state of the structural entity is determined based on the mechanical damage state.

[0106] If the mechanical damage is minor and the fire temperature is below 300°C, the burn rate is 10%.

[0107] If the mechanical damage is moderate and the fire temperature is 300℃-500℃, the burn rate is 40%.

[0108] If the mechanical damage is severe and the fire temperature is 500℃-800℃, the burn rate is 70%.

[0109] If the mechanical damage state is complete and the fire temperature is 800℃-900℃, then the burn rate is 100%.

[0110] In one feasible implementation, the surface temperature field data of each structural component is extracted, and the temperature data is associated with the BIM component based on the component ID and coordinate range in the BIM model to determine the damage level of the component.

[0111] S4. Based on the temperature field data of the non-structural solid parts of each component, and combined with the material fire resistance threshold, determine the damage state of the non-structural solid parts.

[0112] Optionally, step S4 above may include:

[0113] For the non-structural solid parts (such as plaster) of the main load-bearing components (such as frame beams, frame columns, shear walls, etc.), it is assumed that their burn rate is consistent with that of the structural parts.

[0114] If the temperature of pipelines, furniture, and decorative materials exceeds the material's ignition temperature, they are deemed to have failed.

[0115] If the temperature of an electronic device exceeds its operating temperature, it is considered to be malfunctioning.

[0116] If the temperature of the insulation core material exceeds the material's ignition point, it is determined to be a combustion failure.

[0117] If the temperature of the exterior window glass reaches its softening point, it is considered a window failure.

[0118] If the temperature of the ventilation duct exceeds the softening temperature of the galvanized steel sheet, it is considered a structural collapse.

[0119] If the temperature sensing element of the fire sprinkler system reaches the rated operating temperature, the functional loss shall be recorded according to the actual start-up status.

[0120] If the temperature of the fireproof coating exceeds its critical temperature and the duration exceeds its fire resistance limit, it is determined to be carbonization failure.

[0121] S5. Based on the flue gas propagation data of the outer surface, obtain the flue gas contamination status of the outer surface of each component.

[0122] In one feasible implementation, FDS software is used to record the change in smoke layer height over time in each room, and the relative height of the smoke layer is calculated. An element collector is created using the Revit API, traversing all building elements on that floor in units of building elevation. Then, based on the smoke monitoring device number, a boundary collector is used to obtain the boundary and height of the corresponding room, generating a bounding box model, and filtering out various components contained within this bounding box.

[0123] S6. Calculate the economic loss of each component based on the damage status of the structural solid parts, the damage status of the non-structural solid parts, and the smoke pollution status of the outer surface. Obtain the total building loss based on the economic losses of all components.

[0124] In one feasible implementation, the loss of the structural parts of the component and the non-structural solid parts of the main load-bearing and structural components is calculated as burn loss rate × construction cost × component volume.

[0125] The loss of the non-structural parts of the components is calculated as (maximum construction cost × repair cost corresponding to the final damage level) / repair cost at the maximum damage level.

[0126] The loss on the outer surface of the component is calculated as the smoke-covered area multiplied by the unit area cost.

[0127] The total loss for each component is the sum of the three types of losses mentioned above, and does not exceed the construction cost of the complete component.

[0128] This invention provides a method for assessing the economic losses of buildings under the coupled effects of earthquakes and secondary fires. Through earthquake damage analysis and CFD fire analysis, the economic losses of buildings under complex disasters are quantified, providing a scientific and accurate basis for decision-making in post-earthquake recovery and reconstruction. This is a more effective and scientific method for assessing the economic losses of buildings under the coupled effects of earthquakes and secondary fires.

[0129] Figure 2 This is a block diagram illustrating a building economic loss assessment device under the coupled effects of earthquakes and secondary fires, according to an exemplary embodiment. The device is used in a method for assessing building economic losses under the coupled effects of earthquakes and secondary fires. (Refer to...) Figure 2 The device includes an acquisition module 310, a creation module 320, a damage state analysis module 330 for structural solid parts, a damage state analysis module 340 for non-structural solid parts, a flue gas contamination analysis module 350 for outer surfaces, and an output module 360. Wherein:

[0130] The acquisition module 310 is used to acquire a three-dimensional model of the building to be evaluated, and to acquire post-earthquake damage data of the building through nonlinear time history analysis based on the three-dimensional model and the ground motion input data.

[0131] Module 320 is established to create a secondary fire CFD analysis model based on post-earthquake damage data of buildings, determine the highest probability ignition point for CFD analysis, and output temperature field data of structural solid parts, temperature field data of non-structural solid parts, and smoke spread data of external surface parts for each component of the building.

[0132] The damage state analysis module 330 for structural solid parts is used to analyze the structure under temperature load based on the temperature field data of the structural solid parts of each component, and to determine the damage state of the structural solid parts.

[0133] The damage state analysis module 340 for non-structural solid parts is used to determine the damage state of non-structural solid parts based on the temperature field data of the non-structural solid parts of each component and the material fire resistance threshold.

[0134] The outer surface flue gas contamination analysis module 350 is used to obtain the flue gas contamination status of the outer surface of each component based on the flue gas propagation data of the outer surface portion.

[0135] The output module 360 ​​is used to calculate the economic loss of each component based on the damage status of the structural solid parts, the damage status of the non-structural solid parts, and the smoke pollution status of the outer surface, and to obtain the total building loss based on the economic loss of all components.

[0136] Optionally, the ground motion input data includes: acceleration time history, ground motion response spectrum, peak parameters, and duration.

[0137] Optionally, post-earthquake damage data for buildings may include: post-earthquake deformation, surface cracking, and damage data of building structural components.

[0138] Module 320 is created for further use in:

[0139] S21. Establish a CFD analysis model for secondary fires based on post-earthquake component deformation, surface cracking, and damage data of building structures.

[0140] S22. Add material properties to building components, arrange combustibles, divide the grid, and determine the highest probability ignition point.

[0141] S23. Based on post-earthquake damage data of buildings, set combustion parameters and conduct CFD analysis.

[0142] Optionally, the damage state analysis module 330 for the structural entity is further used for:

[0143] Based on the temperature field data of the structural entity of each component, the deformation of the structural entity under temperature load is analyzed, the mechanical damage state is determined based on the deformation, and the damage state of the structural entity is determined based on the mechanical damage state.

[0144] If the mechanical damage state is minor and the fire temperature is below 300℃, then the damage state of the structural entity is a burn rate of 10%.

[0145] If the mechanical damage state is moderate and the fire temperature is 300℃-500℃, then the damage state of the structural solid part is a burn rate of 40%.

[0146] If the mechanical damage state is severe and the fire temperature is 500℃-800℃, then the damage state of the structural entity is a burn rate of 70%.

[0147] If the mechanical damage state is complete damage and the fire temperature is 800℃-900℃, then the damage state of the structural entity is 100% burn rate.

[0148] Optionally, the damage state analysis module 340 for non-structural solid parts is further used for:

[0149] For the non-structural solid parts of the main load-bearing and structural components, the damage state is consistent with the burn rate of the corresponding structural solid parts.

[0150] For pipelines, furniture, and decorative materials, if the temperature exceeds the material's ignition temperature, it is considered to be ineffective.

[0151] For electronic devices, if the temperature exceeds the operating temperature, it is considered a failure.

[0152] For the insulation core material, if the temperature exceeds the material's ignition point, it is determined to be a combustion failure.

[0153] For exterior window glass, if the temperature reaches its softening point, it is considered a window failure.

[0154] For ventilation ducts, if the temperature exceeds the softening temperature of galvanized steel sheets, it is considered a structural collapse.

[0155] For the temperature sensing element of the fire sprinkler system, if the rated operating temperature is reached, the functional loss is recorded according to the actual start-up state.

[0156] For fire-retardant coatings, if the temperature exceeds its critical temperature and the duration exceeds its fire resistance limit, it is considered to have carbonized and failed.

[0157] Optionally, the flue gas contamination analysis module 350 on the outer surface is further used for:

[0158] The FDS software was used to record the changes in the smoke layer height of each room in the building over time, and the relative height of the smoke layer was calculated. An element collector was created using the Revit API. Using the building elevation as the unit, all building elements on the floor were traversed. Based on the number of the smoke monitoring device, the boundary collector was used to obtain the boundary and height of the corresponding room, generating a bounding box model. Each component contained in the bounding box model was filtered to obtain the smoke contamination status of the outer surface of each component.

[0159] Optionally, the output module 360 ​​is further used for:

[0160] The calculation method for the economic loss of the structural entity is: burn-off rate × construction cost × component volume.

[0161] The calculation method for the economic loss of the main stress-bearing and load-bearing components of non-structural solid parts is: burn-off rate × construction cost × component volume.

[0162] The calculation method for economic losses of non-structural entities other than the main load-bearing and structural members is: (maximum construction cost × repair cost corresponding to the final damage level) / repair cost at the maximum damage level.

[0163] The calculation method for the economic loss of the outer surface of the component is: smoke-covered area × unit area cost.

[0164] The total loss of each component is calculated based on the economic losses of the structural solid parts, the non-structural solid parts, and the external surface, and the total loss does not exceed the construction cost of the complete component.

[0165] This invention provides a method for assessing the economic losses of buildings under the coupled effects of earthquakes and secondary fires. Through earthquake damage analysis and CFD fire analysis, the economic losses of buildings under complex disasters are quantified, providing a scientific and accurate basis for decision-making in post-earthquake recovery and reconstruction. This is a more effective and scientific method for assessing the economic losses of buildings under the coupled effects of earthquakes and secondary fires.

[0166] Figure 3 This is a structural schematic diagram of a building economic loss assessment device provided in an embodiment of the present invention, as shown below. Figure 3 As shown, the equipment for assessing economic losses in buildings may include the above-mentioned... Figure 2 The illustrated device for assessing building economic losses under the coupled effects of earthquakes and secondary fires. Optionally, the building economic loss assessment device 410 may include a first processor 2001.

[0167] Optionally, the building economic loss assessment device 410 may also include a memory 2002 and a transceiver 2003.

[0168] The first processor 2001, memory 2002, and transceiver 2003 can be connected via a communication bus.

[0169] The following is combined with Figure 3 A detailed description of each component of the building economic loss assessment equipment 410 is provided below:

[0170] The first processor 2001 is the control center of the building economic loss assessment device 410. It can be a single processor or a collective term for multiple processing elements. For example, the first processor 2001 can be one or more central processing units (CPUs), application-specific integrated circuits (ASICs), or one or more integrated circuits configured to implement embodiments of the present invention, such as one or more digital signal processors (DSPs), or one or more field-programmable gate arrays (FPGAs).

[0171] Optionally, the first processor 2001 can perform various functions of the building economic loss assessment device 410 by running or executing software programs stored in the memory 2002 and calling data stored in the memory 2002.

[0172] In a specific implementation, as one example, the first processor 2001 may include one or more CPUs, for example... Figure 3 CPU0 and CPU1 are shown in the diagram.

[0173] In a specific implementation, as one example, the building economic loss assessment device 410 may also include multiple processors, such as... Figure 3 The first processor 2001 and the second processor 2004 are shown in the diagram. Each of these processors can be a single-core processor or a multi-core processor. Here, a processor can refer to one or more devices, circuits, and / or processing cores used to process data (such as computer program instructions).

[0174] The memory 2002 is used to store the software program that executes the present invention, and is controlled by the first processor 2001 to execute it. The specific implementation method can be referred to the above method embodiment, and will not be repeated here.

[0175] Optionally, the memory 2002 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited thereto. The memory 2002 may be integrated with the first processor 2001 or may exist independently, and may be connected via the interface circuit of the building economic loss assessment device 410. Figure 3 (Not shown in the image) is coupled to the first processor 2001, and this embodiment of the invention does not specifically limit this.

[0176] The transceiver 2003 is used to communicate with network devices or with terminal devices.

[0177] Alternatively, transceiver 2003 may include a receiver and a transmitter. Figure 3 (Not shown separately). The receiver is used to implement the receiving function, and the transmitter is used to implement the transmitting function.

[0178] Optionally, the transceiver 2003 can be integrated with the first processor 2001, or it can exist independently and be connected to the interface circuit of the building economic loss assessment device 410. Figure 3 (Not shown in the image) is coupled to the first processor 2001, and this embodiment of the invention does not specifically limit this.

[0179] It should be noted that, Figure 3 The structure of the building economic loss assessment device 410 shown in the diagram does not constitute a limitation on the router. Actual knowledge structure identification devices may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0180] Furthermore, the technical effect of the building economic loss assessment device 410 can be referred to the technical effect of the building economic loss assessment method under the coupled action of earthquake and secondary fire described in the above method embodiments, and will not be repeated here.

[0181] It should be understood that the first processor 2001 in the embodiments of the present invention may be a central processing unit (CPU), or it may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc.

[0182] It should also be understood that the memory in the embodiments of the present invention can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of random access memory (RAM) are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate synchronous DRAM (DDR SDRAM), enhanced synchronous DRAM (ESDRAM), synchronous linked DRAM (SLDRAM), and direct rambus RAM (DR RAM).

[0183] The above embodiments can be implemented, in whole or in part, by software, hardware (such as circuits), firmware, or any other combination thereof. When implemented using software, the above embodiments can be implemented, in whole or in part, as a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, all or part of the processes or functions described in the embodiments of the present invention are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more sets of available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium. A semiconductor medium can be a solid-state drive.

[0184] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural. Additionally, the character " / " in this article generally indicates an "or" relationship between the preceding and following related objects, but it can also represent an "and / or" relationship. Please refer to the context for a more accurate understanding.

[0185] In this invention, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of a single item or a plurality of items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be a single item or multiple items.

[0186] It should be understood that, in various embodiments of the present invention, the order of the above-mentioned process numbers does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0187] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0188] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the devices, apparatuses, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0189] In the several embodiments provided by this invention, it should be understood that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0190] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0191] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0192] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0193] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for assessing the economic losses of buildings under the coupled effects of earthquakes and secondary fires, characterized in that, The method includes: S1. Obtain a three-dimensional model of the building to be evaluated. Based on the three-dimensional model and the ground motion input data, obtain the post-earthquake damage data of the building through nonlinear time history analysis. S2. Based on the post-earthquake damage data of the building, establish a secondary fire CFD analysis model, determine the highest probability ignition point, perform CFD analysis, and output the temperature field data of the structural solid part, the temperature field data of the non-structural solid part, and the smoke spread data of the outer surface part of each component of the building. S3. Based on the temperature field data of the structural entity of each component, analyze the structure under temperature load and determine the damage state of the structural entity. S4. Based on the temperature field data of the non-structural solid parts of each component, combined with the material fire resistance threshold, determine the damage state of the non-structural solid parts. S5. Based on the flue gas spread data of the outer surface, obtain the flue gas contamination status of the outer surface of each component; S6. Calculate the economic loss of each component based on the damage status of the structural solid parts, the damage status of the non-structural solid parts, and the smoke pollution status of the outer surface. Obtain the total building loss based on the economic losses of all components. The step S3 involves analyzing the structure under temperature load based on the temperature field data of the structural entity of each component, and determining the damage state of the structural entity, including: Based on the temperature field data of the structural solid part of each component, analyze the deformation of the structural solid part under temperature load, determine the mechanical damage state based on the deformation, and determine the damage state of the structural solid part based on the mechanical damage state. If the mechanical damage state is minor and the fire temperature is below 300℃, then the damage state of the structural entity is a burn rate of 10%. If the mechanical damage state is moderate and the fire temperature is 300℃-500℃, then the damage state of the structural solid part is a burn rate of 40%. If the mechanical damage state is severe and the fire temperature is 500℃-800℃, then the damage state of the structural entity is a burn rate of 70%. If the mechanical damage state is complete damage and the fire temperature is 800℃-900℃, then the damage state of the structural entity is 100% burn rate. The step S4, which involves determining the damage state of the non-structural solid parts based on the temperature field data of each component's non-structural solid parts and the material's fire resistance threshold, includes: For the non-structural solid parts of the main load-bearing and structural components, the damage state is consistent with the burn rate of the corresponding structural solid parts. For pipelines, furniture, and decorative materials, if the temperature exceeds the material's ignition temperature, it is considered to be ineffective; For electronic devices, if the temperature exceeds the operating temperature, it is considered a failure. For the core material of the insulation layer, if the temperature exceeds the material's ignition point, it is determined to be a combustion failure. For exterior window glass, if the temperature reaches its softening point, it is considered a window damage. For ventilation ducts, if the temperature exceeds the softening temperature of galvanized steel sheet, it is considered a structural collapse. For the temperature sensing element of the fire sprinkler system, if the rated operating temperature is reached, the functional loss shall be recorded according to the actual start-up state. For fire-retardant coatings, if the temperature exceeds its critical temperature and the duration exceeds its fire resistance limit, it is considered to have carbonized and failed.

2. The method for assessing building economic losses under the coupled effects of earthquakes and secondary fires according to claim 1, characterized in that, The seismic input data in S1 includes: acceleration time history, seismic response spectrum, peak parameters, and duration.

3. The method for assessing building economic losses under the coupled effects of earthquakes and secondary fires according to claim 1, characterized in that, The post-earthquake damage data of the building includes: post-earthquake deformation, surface cracking and damage data of building structural components; The step S2 involves establishing a secondary fire CFD analysis model based on post-earthquake damage data of buildings, determining the highest probability ignition point, and performing CFD analysis, including: S21. Establish a CFD analysis model for secondary fires based on post-earthquake component deformation, surface cracking and damage data of building structures. S22. Add material properties to building components, arrange combustibles, divide the grid, and determine the highest probability ignition point; S23. Based on post-earthquake damage data of buildings, set combustion parameters and conduct CFD analysis.

4. The method for assessing building economic losses under the coupled effects of earthquakes and secondary fires according to claim 1, characterized in that, The step S5, which obtains the flue gas contamination status of the outer surface of each component based on the flue gas propagation data of the outer surface portion, includes: The FDS software was used to record the changes in the smoke layer height of each room in the building over time, and the relative height of the smoke layer was calculated. An element collector was created using the Revit API. Using the building elevation as the unit, all building elements on the floor were traversed. Based on the number of the smoke monitoring device, the boundary collector was used to obtain the boundary and height of the corresponding room, generating a bounding box model. Each component contained in the bounding box model was filtered to obtain the smoke contamination status of the outer surface of each component.

5. The method for assessing building economic losses under the coupled effects of earthquakes and secondary fires according to claim 1, characterized in that, The economic losses of each component calculated in S6 based on the damage status of the structural solid parts, the damage status of the non-structural solid parts, and the smoke pollution status of the outer surface include: The calculation method for the economic loss of the structural entity is: burn-off rate × construction cost × component volume; The calculation method for the economic loss of the main load-bearing and structural components of non-structural entities is: burn-off rate × construction cost × component volume; The calculation method for economic losses of non-structural entities other than the main load-bearing and structural members is: (maximum construction cost × repair cost corresponding to the final damage level) / repair cost at the maximum damage level; The calculation method for the economic loss of the outer surface of the component is: smoke-covered area × unit area cost; The total loss of each component is calculated based on the economic losses of the structural solid parts, the non-structural solid parts, and the external surface, and the total loss does not exceed the construction cost of the complete component.

6. A device for assessing the economic losses of buildings under the coupled effects of earthquakes and secondary fires, wherein the device is used to implement the method for assessing the economic losses of buildings under the coupled effects of earthquakes and secondary fires as described in any one of claims 1-5, characterized in that... The device includes: The acquisition module is used to acquire a three-dimensional model of the building to be evaluated. Based on the three-dimensional model and the ground motion input data, it obtains the post-earthquake damage data of the building through nonlinear time history analysis. A module is established to create a secondary fire CFD analysis model based on post-earthquake damage data of buildings, determine the highest probability ignition point for CFD analysis, and output temperature field data of the structural solid part, temperature field data of the non-structural solid part, and smoke spread data of the outer surface part of each component of the building. The damage state analysis module for structural solid parts is used to analyze the structure under temperature load based on the temperature field data of the structural solid parts of each component, and to determine the damage state of the structural solid parts. The damage state analysis module for non-structural solid parts is used to determine the damage state of non-structural solid parts based on the temperature field data of the non-structural solid parts of each component and the material fire resistance threshold. The outer surface flue gas contamination analysis module is used to obtain the flue gas contamination status of the outer surface of each component based on the flue gas propagation data of the outer surface portion; The output module is used to calculate the economic loss of each component based on the damage status of the structural solid parts, the damage status of the non-structural solid parts, and the smoke pollution status of the outer surface, and to obtain the total building loss based on the economic losses of all components.

7. A building economic loss assessment device, characterized in that, The building economic loss assessment equipment includes: processor; A memory storing computer-readable instructions that, when executed by the processor, implement the method as described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium contains program code that can be invoked by a processor to execute the method as described in any one of claims 1 to 5.

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