Building economic loss assessment method and device under earthquake and secondary fire coupling effect

Abstract

The invention provides a building economic loss assessment method and device under the earthquake and secondary fire coupling effect, and relates to the technical field of earthquake engineering. The method comprises the following steps: acquiring a post-earthquake damage state of a building structure through nonlinear time-history analysis according to earthquake input data; establishing a secondary fire CFD analysis model; according to the positions of the flammable and explosive components, determining a highest probability fire point to perform CFD analysis, and outputting temperature field data and flue gas spreading data of a structural entity part, a non-structural entity part and an outer surface part of each component; analyzing according to the temperature field data to obtain damage states of a structural part and a non-structural part of the component; and obtaining the flue gas contamination condition of the outer surfaces of the components according to the flue gas spreading data, further calculating the economic loss of each component, and summarizing the loss of all the components to obtain the total loss of the building. According to the method, the technical blank of multi-disaster coupling loss evaluation is filled up, and a more effective and more scientific decision basis is provided for post-earthquake emergency and reconstruction.

Description

Technical Field

[0001] The present invention relates to the technical field of earthquake engineering, and particularly to a method and device for evaluating the economic loss of buildings under the coupled action of earthquake and secondary fire. Background Art

[0002] An earthquake is a highly destructive natural disaster, which often triggers a series of secondary disasters after its occurrence. Among them, fire is particularly common and extremely harmful. On the basis of the damage caused by the earthquake, the spread speed of the fire will be significantly accelerated due to the damage of fire prevention components, thus becoming a "booster" for the rapid spread of the fire, further exacerbating the severity of the disaster.

[0003] However, most current studies focus on the analysis of single disasters, and there are relatively few studies on the damage assessment method under the coupled action of multiple physical fields such as earthquake and secondary fire. The disaster scenarios under this coupled action are complex and changeable, and the research results of single disasters are difficult to directly and accurately reflect the actual situation. In addition, in the process of evaluating the existing economic loss model, the influence of non-structural components is often not fully considered. Non-structural components such as interior decoration, equipment, and furniture in buildings will also suffer serious damage during earthquakes and fires, and may even trigger a chain reaction, resulting in greater losses.

[0004] Therefore, how to reasonably and reliably evaluate the economic loss of buildings under the coupled action of earthquake and secondary fire is of great significance for earthquake damage assessment and post-earthquake emergency. However, there is currently a lack of a method for evaluating the economic loss of buildings considering the coupled action of earthquake and secondary fire. Summary of the Invention

[0005] In order to solve the technical problem that there is currently a lack of a method for evaluating the economic loss of buildings considering the coupled action of earthquake and secondary fire, an embodiment of the present invention provides a method and device for evaluating the economic loss of buildings under the coupled action of earthquake and secondary fire. The technical solution is as follows:

[0006] On the one hand, a method for evaluating the economic loss of buildings under the coupled action of earthquake and secondary fire is provided. This method is implemented by a building economic loss evaluation device, and the method includes:

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

[0008] S2. Establish a CFD analysis model for secondary fire according to the post-earthquake damage data of the building, determine the highest probability ignition point for CFD analysis, and output the temperature field data of the structural entity part, the temperature field data of the non-structural entity part, and the smoke spread data of the outer surface part of each component of the building.

[0009] S3. Analyze the structure under temperature load based on the temperature field data of the structural entity part of each component, and judge the damage state of the structural entity part.

[0010] S4. Combine the temperature field data of the non-structural entity part of each component with the material fire resistance threshold to judge the damage state of the non-structural entity part.

[0011] S5. Obtain the smoke fouling condition of the outer surface of each component according to the smoke spread data of the outer surface part.

[0012] S6. Calculate the economic loss of each component based on the damage state of the structural entity part, the damage state of the non-structural entity part, and the smoke fouling condition of the outer surface, and obtain the total building loss based on the economic losses of all components.

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

[0014] Optionally, the post-earthquake damage data of the building includes: post-earthquake component deformation, surface cracking, and damage data of the building structure.

[0015] Establish a secondary fire CFD analysis model based on the post-earthquake damage data of the building in S2, and determine the most probable ignition point for CFD analysis, including:

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

[0017] S22. Add material properties to the building components, arrange combustibles, divide grids, and determine the most probable ignition point.

[0018] S23. Perform CFD analysis by setting combustion parameters based on the post-earthquake damage data of the building.

[0019] Optionally, analyze the structure under temperature load based on the temperature field data of the structural entity part of each component in S3, and judge the damage state of the structural entity part, including:

[0020] Analyze the deformation of the structural entity part under the action of temperature load according to the temperature field data of the structural entity part of each component, judge the mechanical damage state according to the deformation, and judge the damage state of the structural entity part according to the mechanical damage state.

[0021] If the mechanical damage state is slight damage and the fire temperature is lower than 300°C, the damage state of the structural entity part is a burn rate of 10%.

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

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

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

[0025] Optionally, judging the damage state of the non-structural entity part according to the temperature field data of the non-structural entity part of each component in S4 in combination with the fire resistance threshold of the material includes:

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

[0027] For pipelines, furniture and decorative materials, if the temperature exceeds the ignition temperature of the material, it will be judged as failure.

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

[0029] For the core material of the thermal insulation layer, if the temperature exceeds the ignition point of the material, it is judged as combustion failure.

[0030] For exterior window glass, if the temperature reaches its softening point, it is judged as window damage.

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

[0032] For fire sprinkler system temperature sensing elements, if the rated operating temperature is reached, the functional loss shall be recorded according to the actual startup status.

[0033] For fire retardant coatings, if the temperature exceeds its critical temperature and the duration exceeds its fire resistance limit, it is judged as carbonization failure.

[0034] Optionally, the step of obtaining the smoke contamination condition of the outer surface of each component according to the smoke spread data of the outer surface portion in S5 includes:

[0035] The FDS software is used to record the time-varying data of the smoke layer height in each room in the building, and the relative height of the smoke layer is calculated. The Revit API is used to create an element collector, and all building elements of the layer are traversed in units of building elevation. The boundary collector is used to obtain the boundary and height of the corresponding room according to the number of the smoke monitoring equipment, and a bounding box model is generated. The components contained in the bounding box model are filtered to obtain the smoke contamination of the outer surface of each component.

[0036] Optionally, calculating the economic loss of each component according to the damage state of the structural entity part, the damage state of the non-structural entity part, and the flue gas fouling condition of the outer surface in S6, including:

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

[0038] The calculation method for the economic loss of the main stressed and load-bearing components of the non-structural entity part is: burn rate × construction and installation cost × component volume.

[0039] The calculation method for the economic loss of the non-structural entity part other than the main stressed and load-bearing components is: (maximum construction and installation cost × repair cost corresponding to the final damage level) / repair cost under the maximum damage level.

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

[0041] Obtaining the total loss of each component based on the economic loss of the structural entity part, the economic loss of the non-structural entity part, and the economic loss of the outer surface, and the total loss does not exceed the construction and installation cost of the complete component.

[0042] On the other hand, a device for evaluating the economic loss of a building under the coupled action of earthquake and secondary fire is provided. This device is applied to the method for evaluating the economic loss of a building under the coupled action of earthquake and secondary fire. The device includes:

[0043] An acquisition module, configured to acquire the three-dimensional model of the building to be evaluated, and obtain the post-earthquake damage data of the building through nonlinear time history analysis according to the three-dimensional model and the ground motion input data.

[0044] A building module, configured to establish a CFD analysis model for secondary fire according to the post-earthquake damage data of the building, determine the highest probability ignition point for CFD analysis, and output the temperature field data of the structural entity part, the temperature field data of the non-structural entity part, and the smoke spread data of the outer surface part of each component of the building.

[0045] A damage state analysis module for the structural entity part, configured to analyze the structure under the temperature load according to the temperature field data of the structural entity part of each component, and judge the damage state of the structural entity part.

[0046] A damage state analysis module for the non-structural entity part, configured to judge the damage state of the non-structural entity part according to the temperature field data of the non-structural entity part of each component in combination with the material fire resistance threshold.

[0047] A flue gas fouling condition analysis module for the outer surface, configured to obtain the flue gas fouling condition of the outer surface of each component according to the smoke spread data of the outer surface part.

[0048] An output module, configured to calculate the economic loss of each component according to the damage state of the structural entity part, the damage state of the non-structural entity part, and the flue gas fouling condition of the outer surface, and 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, the post-earthquake damage data of the building includes: the deformation of components, surface cracking, and damage data after the earthquake of the building structure.

[0051] A building module, further configured to:

[0052] S21. Establish a CFD analysis model for secondary fires according to the deformation of components, surface cracking, and damage data after the earthquake of the building structure.

[0053] S22. Add material properties to building components, arrange combustibles, divide grids, and determine the most probable ignition point.

[0054] S23. Perform CFD analysis by setting combustion parameters based on the post-earthquake damage data of the building.

[0055] Optionally, a damage state analysis module for the structural entity part, further configured to:

[0056] Analyze the deformation of the structural entity part under the action of temperature load according to the temperature field data of the structural entity part of each component, judge the mechanical damage state according to the deformation, and judge the damage state of the structural entity part according to the mechanical damage state.

[0057] If the mechanical damage state is slight damage and the fire temperature is lower than 300°C, the damage state of the structural entity part is a burn rate of 10%.

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

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

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

[0061] Optionally, a damage state analysis module for the non-structural entity part, further configured to:

[0062] For the non-structural entity parts of the main stress-bearing and load-bearing components, the damage state is the same as the burn rate of the corresponding structural entity part.

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

[0064] For electronic devices, if the temperature exceeds the operating temperature, it is determined to be ineffective.

[0065] For the core material of the thermal insulation layer, if the temperature exceeds the material's ignition point, it is determined to be ineffective due to combustion.

[0066] For the outer window glass, if the temperature reaches its softening point, it is determined that the window form is damaged.

[0067] For ventilation ducts, if the temperature exceeds the softening temperature of galvanized steel sheets, it is determined that the structure collapses.

[0068] For the temperature-sensitive elements of the fire sprinkler system, if the rated operating temperature is reached, record the functional loss according to the actual activation status.

[0069] For fireproof coatings, if the temperature exceeds its critical temperature and the duration exceeds its fire resistance limit, it is determined to be ineffective due to carbonization.

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

[0071] Record the data of the change in the height of the smoke layer in each room in the building over time through the FDS software, and calculate the relative height of the smoke layer; use the Revit API to create an element collector, traverse all building elements on this layer in terms of building elevation, obtain the boundaries and heights of the corresponding rooms according to the numbers of the smoke monitoring devices using the boundary collector, generate a bounding box model, filter each component included in the bounding box model, and then obtain the flue gas soiling condition 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 part is: burn rate × construction and installation cost × component volume.

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

[0075] The calculation method for the economic loss of the non-structural entity part other than the main load-bearing and load-bearing components is: (maximum construction and installation 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-passing area × cost per unit area.

[0077] The total loss of each component is obtained based on the economic loss of the structural entity part, the economic loss of the non-structural entity part, and the economic loss of the outer surface, and the total loss does not exceed the construction and installation cost of the complete component.

[0078] On the other hand, a building economic loss assessment device is provided, which includes: a processor; a memory, on which computer-readable instructions are stored. When the computer-readable instructions are executed by the processor, any one of the methods in the above-mentioned building economic loss assessment method under the coupling action of earthquake and secondary fire is realized.

[0079] On the other hand, a computer-readable storage medium is provided, in which at least one instruction is stored. The at least one instruction is loaded and executed by a processor to realize any one of the methods in the above-mentioned building economic loss assessment method under the coupling action of earthquake and secondary fire.

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

[0081] In the present invention, a building economic loss assessment method considering the coupling action of earthquake and secondary fire is provided. Through earthquake damage analysis and CFD fire analysis, the economic loss of a building under complex disasters is quantified, providing a scientific and accurate decision-making basis for post-earthquake restoration and reconstruction work. It is a more effective and scientific building economic loss assessment method considering the coupling action of earthquake and secondary fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0083] Figure 1 It is a flowchart of a building economic loss assessment method under the coupling action of earthquake and secondary fire provided by an embodiment of the present invention;

[0084] Figure 2 It is a block diagram of a building economic loss assessment device under the coupling action of earthquake and secondary fire provided by an embodiment of the present invention;

[0085] Figure 3 It is a structural schematic diagram of a building economic loss assessment device provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0086] The following describes the technical solutions in the present invention with reference to the drawings.

[0087] In the embodiments of the present invention, words such as "exemplarily" and "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "example" in the present invention should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the word "example" is intended to present the concept in a specific way. In addition, in the embodiments of the present invention, the meaning expressed by "and / or" can be both, or it can be either of the two.

[0088] In the embodiments of the present invention, "image" and "picture" can sometimes be used interchangeably. It should be noted that when the difference between them is not emphasized, the meanings they intend to express are the same. "of", "corresponding, relevant" and "corresponding" can sometimes be used interchangeably. It should be noted that when the difference between them is not emphasized, the meanings they intend to express are the same.

[0089] In the embodiments of the present invention, sometimes a subscript such as W1 may be written as a non-subscript such as W1. When the difference is not emphasized, the meanings to be expressed are consistent.

[0090] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0091] The embodiment of the present invention provides a method for assessing the economic loss of a building under the coupling effect of an earthquake and a secondary fire. The method can be implemented by a device for assessing the economic loss of a building, which can be a terminal or a server. Figure 1 The flowchart of the method for assessing the economic loss of buildings under the coupling effect of earthquake and secondary fire is shown in FIG. The processing flow of the method may include the following steps:

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

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

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

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

[0096] S2. Establish a CFD (Computational Fluid Dynamics) analysis model for post - earthquake secondary fires based on the post - earthquake damage data of the building, determine the highest - probability ignition points for CFD analysis, and output the temperature - field data of the structural entity parts, the temperature - field data of the non - structural entity parts, and the smoke - spread data of the outer surface parts of each component of the building.

[0097] Optionally, establishing a CFD analysis model for post - earthquake secondary fires based on the post - earthquake damage data of the building and determining the highest - probability ignition points for CFD analysis in S2 may include the following steps S21 - S23:

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

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

[0100] S23. Conduct CFD analysis by setting combustion parameters based on the post - earthquake damage data of the building.

[0101] Among them, the combustion parameters may include the type of combustion reaction, heat - release rate, combustion curve, output parameters, and simulation time, etc.

[0102] In a feasible implementation, use Revit to build a building BIM (Building Information Modeling) model, then convert the BIM model into an FDS (Fire Dynamics Simulator) model, add material properties to the building components according to the actual situation, arrange combustibles, divide the grid, and determine the highest - probability ignition points; based on the post - earthquake damage data, set combustion parameters including the type of combustion reaction, heat - release rate, combustion curve, output parameters, and simulation time, etc., and conduct CFD analysis.

[0103] S3. Analyze the structure under the temperature load according to the temperature - field data of the structural entity parts of each component, and judge the damage state of the structural entity parts.

[0104] Optionally, the above - mentioned step S3 may include:

[0105] Analyze the deformation of the structural entity parts under the temperature load according to the temperature - field data of the structural entity parts of each component, judge the mechanical damage state based on the deformation, and judge the damage state of the structural entity parts based on the mechanical damage state.

[0106] If the mechanical damage state is slight damage and the fire temperature is lower than 300 °C, the burn - out rate is 10%.

[0107] If the mechanical damage state is medium damage and the fire temperature is 300°C - 500°C, the burn rate is 40%.

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

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

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

[0111] S4. According to the temperature field data of the non-structural entity part of each member, combined with the fire resistance threshold of the material, judge the damage state of the non-structural entity part.

[0112] Optionally, the above step S4 may include:

[0113] For the non-structural entity parts (such as plastering, etc.) of the main stress-bearing and load-bearing members (such as frame beams, frame columns, shear walls, etc.), it is considered that their burn rates are the same as those of the structural parts.

[0114] If the temperatures of pipelines, furniture, decorative materials, etc. exceed the material ignition temperature, it is determined as failed.

[0115] If the temperature of the electronic equipment exceeds the operating temperature, it is determined as failed.

[0116] If the temperature of the thermal insulation layer core material exceeds the material ignition point, it is determined as combustion failure.

[0117] When the temperature of the exterior window glass reaches its softening point, it is determined as window failure.

[0118] When the temperature of the ventilation duct exceeds the softening temperature of the galvanized steel sheet, it is determined as structural collapse.

[0119] When the temperature-sensitive element of the fire sprinkler system reaches the rated operating temperature, record the functional loss according to the actual startup state.

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

[0121] S5. According to the smoke spread data of the outer surface part, obtain the smoke soiling condition of the outer surface of each member.

[0122] In a feasible implementation, data on the change in the height of the smoke layer in each room over time is recorded using FDS software, and the relative height of the smoke layer is calculated. An element collector is created using the Revit API, and all building elements on this floor are traversed in terms of building elevation. Then, based on the number of the smoke monitoring device, the boundary and height of the corresponding room are obtained using the boundary collector to generate a bounding box model, and various components contained within this bounding box are filtered.

[0123] S6. Calculate the economic loss of each component based on the damage state of the structural entity part, the damage state of the non-structural entity part, and the smoke soiling condition of the outer surface, and obtain the total building loss based on the economic losses of all components.

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

[0125] The loss of the non-structural part of the component described above is calculated as (maximum construction and installation cost × repair cost corresponding to the final damage level) / repair cost at the maximum damage level.

[0126] The loss of the outer surface of the component is calculated as the smoke-passing area × unit area cost.

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

[0128] In the embodiment of the present invention, a method for evaluating the economic loss of a building under the coupled action of earthquake and secondary fire is provided. Through seismic damage analysis and CFD fire analysis, the economic loss of the building under complex disasters is quantified, providing a scientific and accurate decision-making basis for post-earthquake restoration and reconstruction work. It is a more effective and scientific method for evaluating the economic loss of a building under the coupled action of earthquake and secondary fire.

[0129] Figure 2 It is a block diagram of a device for evaluating the economic loss of a building under the coupled action of earthquake and secondary fire shown according to an exemplary embodiment. This device is used for the method for evaluating the economic loss of a building under the coupled action of earthquake and secondary fire. Refer to Figure 2 As shown in the figure, this device includes an acquisition module 310, a construction module 320, a damage state analysis module 330 for the structural entity part, a damage state analysis module 340 for the non-structural entity part, a smoke soiling condition analysis module 350 for the outer surface, and an output module 360. Among them:

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

[0131] The establishment module 320 is used to establish a CFD analysis model for secondary fires based on the post-earthquake damage data of the building, determine the highest probability ignition point for CFD analysis, and output the temperature field data of the structural entity part, the temperature field data of the non-structural entity part, and the smoke spread data of the outer surface part of each component of the building.

[0132] The damage state analysis module 330 for the structural entity part is used to analyze the structure under the temperature load according to the temperature field data of the structural entity part of each component, and judge the damage state of the structural entity part.

[0133] The damage state analysis module 340 for the non-structural entity part is used to judge the damage state of the non-structural entity part according to the temperature field data of the non-structural entity part of each component and in combination with the material fire resistance threshold.

[0134] The smoke pollution situation analysis module 350 for the outer surface is used to obtain the smoke pollution situation of the outer surface of each component according to the smoke spread data of the outer surface part.

[0135] The output module 360 is used to calculate the economic loss of each component according to the damage state of the structural entity part, the damage state of the non-structural entity part, and the smoke pollution situation of the outer surface, and obtain the total building loss according to 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, the post-earthquake damage data of the building includes: post-earthquake component deformation, surface cracking, and damage data of the building structure.

[0138] The establishment module 320 is further used for:

[0139] S21. Establish a CFD analysis model for secondary fires according to the post-earthquake component deformation, surface cracking, and damage data of the building structure.

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

[0141] S23. Perform CFD analysis by setting combustion parameters based on the post-earthquake damage data of the building.

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

[0143] According to the temperature field data of the structural entity part of each component, analyze the deformation of the structural entity part under the action of the temperature load, judge the mechanical damage state according to the deformation, and judge the damage state of the structural entity part according to the mechanical damage state.

[0144] If the mechanical damage state is slight damage and the fire temperature is lower than 300°C, the damage state of the solid part of the structure is a burn rate of 10%.

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

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

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

[0148] Optionally, the damage state analysis module 340 of the non-structural entity part is further used to:

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

[0150] For pipelines, furniture and decorative materials, if the temperature exceeds the ignition temperature of the material, it will be judged as failure.

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

[0152] For the core material of the thermal insulation layer, if the temperature exceeds the ignition point of the material, it is judged as combustion failure.

[0153] For exterior window glass, if the temperature reaches its softening point, it is judged as window damage.

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

[0155] For fire sprinkler system temperature sensing elements, if the rated operating temperature is reached, the functional loss is recorded according to the actual startup status.

[0156] For fire retardant coatings, if the temperature exceeds its critical temperature and the duration exceeds its fire resistance limit, it is judged as carbonization failure.

[0157] Optionally, the smoke pollution condition analysis module 350 of the outer surface is further used to:

[0158] Record the data of the smoke layer height in each room of the building changing with time through the FDS software, and calculate the relative height of the smoke layer; use the Revit API to create an element collector, traverse all building elements on this floor in terms of building elevation, obtain the boundaries and heights of the corresponding rooms using the boundary collector according to the numbers of the smoke monitoring devices, generate a bounding box model, filter each component included in the bounding box model, and then obtain the smoke pollution condition 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 part is: burn loss rate × construction and installation cost × component volume.

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

[0162] The calculation method for the economic loss of the non-structural entity part other than the main load-bearing and load-bearing components is: (maximum construction and installation cost × repair cost corresponding to the final damage level) / repair cost under the maximum damage level.

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

[0164] Obtain the total loss of each component based on the economic loss of the structural entity part, the economic loss of the non-structural entity part, and the economic loss of the outer surface, and the total loss does not exceed the construction and installation cost of the complete component.

[0165] In the embodiment of the present invention, a method for evaluating the economic loss of a building under the coupled action of earthquake and secondary fire is provided. Through seismic damage analysis and CFD fire analysis, the economic loss of the building under complex disasters is quantified, providing a scientific and accurate decision-making basis for the post-earthquake restoration and reconstruction work. It is a more effective and scientific method for evaluating the economic loss of a building under the coupled action of earthquake and secondary fire.

[0166] Figure 3 It is a structural schematic diagram of a building economic loss evaluation device provided by the embodiment of the present invention. As Figure 3 shown, the building economic loss evaluation device may include the above-mentioned Figure 2 shown device for evaluating the economic loss of a building under the coupled action of earthquake and secondary fire. Optionally, the building economic loss evaluation device 410 may include a first processor 2001.

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

[0168] Among them, the first processor 2001, the memory 2002, and the transceiver 2003 can be connected through a communication bus, for example.

[0169] The following specifically introduces each component of the building economic loss assessment device 410 in conjunction with Figure 3 :

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

[0171] Optionally, the first processor 2001 can execute 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 an embodiment, the first processor 2001 can include one or more CPUs, such as Figure 3 the CPU0 and CPU1 shown in

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

[0174] Among them, the memory 2002 is used to store software programs for implementing the solution of the present invention and is controlled by the first processor 2001 for execution. The specific implementation method can refer to the above method embodiments and will not be elaborated here.

[0175] Optionally, the memory 2002 may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or may also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM), or other optical disc storage, optical disc storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media, or other magnetic storage devices, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto. The memory 2002 may be integrated with the first processor 2001 or may exist independently and is coupled to the first processor 2001 through an interface circuit ( Figure 3 not shown) of the building economic loss assessment device 410. The embodiments of the present invention do not make specific limitations thereto.

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

[0177] Optionally, the transceiver 2003 may include a receiver and a transmitter ( Figure 3 not shown separately). Among them, the receiver is used to implement the receiving function, and the transmitter is used to implement the sending function.

[0178] Optionally, the transceiver 2003 may be integrated with the first processor 2001 or may exist independently and is coupled to the first processor 2001 through an interface circuit ( Figure 3 not shown) of the building economic loss assessment device 410. The embodiments of the present invention do not make specific limitations thereto.

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

[0180] In addition, the technical effects of the building economic loss assessment device 410 may refer to the technical effects of the building economic loss assessment method under the coupling action of earthquake and secondary fire described in the above method embodiments, and will not be elaborated 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), and the processor may also 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 the processor may also be any conventional processor, etc.

[0182] It should also be understood that the memory in the embodiments of the present invention may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM) or a flash memory. The volatile memory may be a 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 SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlink 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 combination thereof. When implemented using software, the above embodiments can be implemented in whole or in part in the form of 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, the processes or functions described in the embodiments of the present invention are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. 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 (such as infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that contains one or more collections of available media. The available medium can be a magnetic medium (such as a floppy disk, hard disk, or magnetic tape), an optical medium (such as a DVD), or a semiconductor medium. The semiconductor medium can be a solid-state drive.

[0184] It should be understood that the term "and / or" in this document is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Here, A and B can be singular or plural. In addition, the character " / " in this document generally represents an "or" relationship between the associated objects before and after, but it may also represent an "and / or" relationship, which can be specifically understood with reference to the context before and after.

[0185] In the present invention, "at least one" means one or more, and "a plurality" means two or more. "At least one of the following" or its similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can represent: a, b, c, a - b, a - c, b - c, or a - b - c, where a, b, and c can be single or multiple.

[0186] It should be understood that in various embodiments of the present invention, the magnitudes of the sequence numbers of the above processes do not mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0187] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0188] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described devices, apparatuses, and units can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0189] In several embodiments provided by the present invention, it should be understood that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there can be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces, and the indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.

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

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

[0192] When the above-mentioned functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, 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. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0193] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An assessment method for the economic loss of buildings under the coupled action of earthquakes and secondary fires, characterized in that, The method includes: S1. Obtain the three-dimensional model of the building to be evaluated. According to the three-dimensional model and the seismic ground motion input data, obtain the post-earthquake damage data of the building through nonlinear time history analysis; S2. Establish a CFD analysis model for secondary fires based on the post-earthquake damage data of the building. Determine the most probable ignition point for CFD analysis, and output the temperature field data of the structural entity part, the temperature field data of the non-structural entity part, and the smoke spread data of the outer surface part of each component of the building; S3. According to the temperature field data of the structural entity part of each component, conduct an analysis of the structure under the temperature load, and judge the damage state of the structural entity part; S4. According to the temperature field data of the non-structural entity part of each component, combined with the fire resistance threshold of the material, judge the damage state of the non-structural entity part; S5. According to the smoke spread data of the outer surface part, obtain the smoke soiling condition of the outer surface of each component; S6. Calculate the economic loss of each component according to the damage state of the structural entity part, the damage state of the non-structural entity part, and the smoke soiling condition of the outer surface, and obtain the total loss of the building according to the economic loss of all components.

2. The method for evaluating the economic loss of buildings under the coupled action of earthquake and secondary fire according to claim 1, wherein The seismic ground motion input data in S1 includes: acceleration time history, seismic ground motion response spectrum, peak parameters, and duration.

3. The method for evaluating the economic loss of buildings under the coupled action of earthquake and secondary fire according to claim 1, characterized in that, The post-earthquake damage data of the building includes: post-earthquake component deformation, surface cracking, and damage data of the building structure; The establishment of a CFD analysis model for secondary fires based on the post-earthquake damage data of the building in S2 and the determination of the most probable ignition point for CFD analysis include: S21. Establish a CFD analysis model for secondary fires based on the post-earthquake component deformation, surface cracking, and damage data of the building structure; S22. Add material properties to the building components, arrange combustibles, divide the grid, and determine the most probable ignition point; S23. Conduct CFD analysis by setting combustion parameters based on the post-earthquake damage data of the building.

4. The method for evaluating the economic loss of buildings under the coupling action of earthquake and secondary fire according to claim 1, characterized in that, The analysis of the structure under the temperature load according to the temperature field data of the structural entity part of each component in S3 and the judgment of the damage state of the structural entity part include: According to the temperature field data of the structural entity part of each component, analyze the deformation of the structural entity part under the action of the temperature load, judge the mechanical damage state according to the deformation, and judge the damage state of the structural entity part according to the mechanical damage state; If the mechanical damage state is slight damage and the fire temperature is lower than 300 °C, the damage state of the structural entity part is a burn rate of 10%; If the mechanical damage state is moderate damage and the fire temperature is 300 °C - 500 °C, the damage state of the structural entity part is a burn rate of 40%; If the mechanical damage state is severe damage and the fire temperature is 500 °C - 800 °C, the damage state of the structural entity part is a burn rate of 70%; If the mechanical damage state is complete damage and the fire temperature is 800 °C - 900 °C, the damage state of the structural entity part is a burn rate of 100%.

5. The method for evaluating the economic loss of a building under the coupled action of an earthquake and a secondary fire according to claim 1, wherein The judgment of the damage state of the non-structural entity part according to the temperature field data of the non-structural entity part of each component in S4, combined with the fire resistance threshold of the material, includes: For the non-structural entity part of the main load-bearing and load-carrying components, the damage state is the same as the burn rate of the corresponding structural entity part; For pipelines, furniture and decorative materials, if the temperature exceeds the ignition temperature of the material, it is considered to be a failure; For electronic equipment, if the temperature exceeds the operating temperature, it is considered to be a failure; For the insulation core material, if the temperature exceeds the ignition point of the material, it is considered as combustion failure; For exterior window glass, if the temperature reaches its softening point, it is considered as window damage; For ventilation ducts, if the temperature exceeds the softening temperature of the galvanized steel sheet, it is considered as structural collapse; For fire sprinkler system temperature sensing elements, if the rated operating temperature is reached, the functional loss is recorded according to the actual startup status; For fire retardant coatings, if the temperature exceeds its critical temperature and the duration exceeds its fire resistance limit, it is judged as carbonization failure.

6. The method for evaluating the economic loss of a building under the coupling action of an earthquake and a secondary fire according to claim 1, wherein The step S5 of obtaining the smoke contamination condition of the outer surface of each component according to the smoke spread data of the outer surface portion includes: The FDS software is used to record the time-varying data of the smoke layer height in each room in the building, and the relative height of the smoke layer is calculated. The Revit API is used to create an element collector, and all building elements of the layer are traversed in units of building elevation. The boundary collector is used to obtain the boundary and height of the corresponding room according to the number of the smoke monitoring equipment, and a bounding box model is generated. The components contained in the bounding box model are filtered to obtain the smoke contamination of the outer surface of each component.

7. The method for evaluating the economic loss of buildings under the coupled action of earthquake and secondary fire according to claim 1, wherein The step S6 of calculating the economic loss of each component according to the damage state of the structural entity part, the damage state of the non-structural entity part and the smoke pollution of the outer surface includes: The calculation method for the economic loss of the solid part of the structure is: burn rate × construction cost × component volume; The calculation method for the economic loss of the main load-bearing and load-bearing components of the non-structural entity is: burn rate × construction cost × component volume; The calculation method for the economic losses of non-structural entities other than the main load-bearing and load-bearing components is: (maximum construction cost × repair cost corresponding to the final damage level) / repair cost under the maximum damage level; The calculation method for the economic loss of the outer surface of the component is: smoke passage area × unit area cost; The total loss of each component is obtained based on the economic loss of the structural entity part, the economic loss of the non-structural entity part and the economic loss of the outer surface, and the total loss shall not exceed the construction cost of the complete component.

8. An apparatus for evaluating the economic loss of a building under the coupled action of an earthquake and a secondary fire, the apparatus for evaluating the economic loss of a building under the coupled action of an earthquake and a secondary fire is used to implement the method for evaluating the economic loss of a building under the coupled action of an earthquake and a secondary fire according to any one of claims 1-7, characterized in that, The device comprises: An acquisition module is used to acquire a three-dimensional model of the building to be evaluated, and obtain the building post-earthquake damage data through nonlinear time history analysis based on the three-dimensional model and earthquake input data; Establish a module for establishing a secondary fire CFD analysis model based on the building post-earthquake damage data, determine the highest probability fire point for CFD analysis, and output the temperature field data of the structural entity part of each component of the building, the temperature field data of the non-structural entity part, and the smoke spread data of the external surface part; The damage state analysis module of the structural entity part is used to analyze the structure under temperature load and determine the damage state of the structural entity part according to the temperature field data of the structural entity part of each component; The damage state analysis module for the non-structural entity part is used to judge the damage state of the non-structural entity part according to the temperature field data of the non-structural entity part of each component and in combination with the material fire resistance threshold; The flue gas fouling condition analysis module for the outer surface is used to obtain the flue gas fouling condition of the outer surface of each component according to the flue gas spread data of the outer surface part; The output module is used to calculate the economic loss of each component according to the damage state of the structural entity part, the damage state of the non-structural entity part and the flue gas fouling condition of the outer surface, and obtain the total building loss according to the economic losses of all components.

9. An equipment for evaluating the economic loss of a building, characterized in that, The building economic loss assessment device includes: A processor; A memory, on which computer-readable instructions are stored, and when the computer-readable instructions are executed by the processor, the method described in any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that, Program code is stored in the computer-readable storage medium, and the program code can be called by the processor to execute the method described in any one of claims 1 to 7.

Images