CN113818709A - Anti-knock upgrading and transforming method and system for building - Google Patents

Anti-knock upgrading and transforming method and system for building Download PDF

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Publication number
CN113818709A
CN113818709A CN202010562134.8A CN202010562134A CN113818709A CN 113818709 A CN113818709 A CN 113818709A CN 202010562134 A CN202010562134 A CN 202010562134A CN 113818709 A CN113818709 A CN 113818709A
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explosion
building
source
probability
determining
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CN113818709B (en
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凌晓东
顾蒙
于安峰
党文义
陈国鑫
鲍磊
李厚达
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China Petroleum and Chemical Corp
Sinopec Safety Engineering Research Institute Co Ltd
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China Petroleum and Chemical Corp
Sinopec Qingdao Safety Engineering Institute
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00Working measures on existing buildings
    • E04G23/02Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218Increasing or restoring the load-bearing capacity of building construction elements
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62Insulation or other protection; Elements or use of specified material therefor
    • E04B1/92Protection against other undesired influences or dangers

Abstract

The embodiment of the invention provides an anti-knock upgrading and reconstruction method and system for a building, and belongs to the technical field of petrochemical industry. The method comprises the following steps: acquiring a target anti-explosion value of the building; detecting the strength of the building; applying the explosion shock wave corresponding to the target anti-explosion protection value to a simulated building of the building; calculating a ductility ratio or a support angle of a structural member of the simulated building after experiencing the blast shock wave action from the strength of the building; and determining the structure as a weak point of the building under the condition that the ductility ratio of the structure is greater than the ductility ratio threshold or the support rotation angle is greater than the support rotation angle threshold, so as to perform anti-knock upgrading modification on the weak point. The building anti-explosion device can realize targeted upgrading and reconstruction of the building, improve the anti-explosion capability of the building and reduce the safety risk.

Description

Anti-knock upgrading and transforming method and system for building
Technical Field
The invention relates to the technical field of petrochemical industry, in particular to an anti-knock upgrading and transforming method and system for a building.
Background
When explosion accidents (such as oil pipeline explosion accidents in yellow island, Tianjin harbor explosion accidents and Jiangsu water explosion accidents) occur, the destructive power is huge, and a great amount of casualties in non-explosion-proof buildings near the explosion source are often caused. At present, only a few newly-built chemical enterprises or devices in the petrochemical industry consider the anti-explosion safety design of occupied places of nearby personnel, for example, part of central control rooms or device control rooms adopt the anti-explosion control room design, and most of internal personnel close to a high-explosion danger device occupy buildings, only considering the fire protection requirement but not considering the anti-explosion performance. These buildings, once damaged by the shock waves, cause serious personal and property damage. Therefore, upgrading and modifying the building to improve the anti-explosion capability of the building is a technical problem which needs to be solved urgently at present.
Disclosure of Invention
The embodiment of the invention aims to provide an anti-explosion upgrading and reconstruction method and system for a building, which are used for upgrading and reconstructing the building so as to improve the anti-explosion capability of the building and reduce the safety risk.
In order to achieve the above object, an embodiment of the present invention provides an anti-knock upgrade reconstruction method for a building, including: acquiring a target anti-explosion value of the building; detecting the strength of the building, wherein the strength comprises the compressive strength of a concrete structure and mortar, the tensile strength of a steel bar and the shear strength of a brick wall; applying the explosion shock wave corresponding to the target anti-explosion protection value to a simulated building of the building; calculating a ductility ratio or a support angle of a structural member of the simulated building after experiencing the blast shock wave action from the strength of the building; and determining the structure as a weak point of the building under the condition that the ductility ratio of the structure is greater than the ductility ratio threshold or the support rotation angle is greater than the support rotation angle threshold, so as to perform anti-knock upgrading modification on the weak point.
Optionally, calculating a ductility ratio or a support angle of the structural member of the simulated building after experiencing the blast shock wave action based on the strength of the building comprises:
calculating a ductility ratio of the structural member according to the following formula:
Figure BDA0002546521740000021
calculating a seat angle of the structural member according to the following formula:
Figure BDA0002546521740000022
wherein the content of the first and second substances,
Xm=R/k
k=I/L0 3
Figure BDA0002546521740000023
Figure BDA0002546521740000024
Figure BDA0002546521740000025
wherein μ is the ductility ratio, XmRepresenting the elastoplastic deformation of said structural member after the action of said explosive shock wave, XyRepresenting the deformation of the structural member at the elastic limit, theta representing the angle of rotation of the support, L0Representing the span of the structural member, R representing the reflected pressure generated by the blast shock wave, k representing the stiffness of the structural member, I representing the section moment of inertia of the structural member, b representing the section width of the structural member, d representing the section effective height of the structural member, AsReinforcement area of the structural member, ES-expressing the tensile strength of said bars, EcdIndicating the compressive strength of the concrete structure and mortar or the shear strength of the brick wall.
Optionally, the obtaining of the target explosion-proof value of the building includes: determining an explosive source within a preset distance of the building; determining the frequency of occurrence of explosion accidents of the explosion source; for different explosion accident occurrence frequencies, carrying out explosion simulation on the explosion source to determine different explosion overpressure of the explosion source; carrying out curve simulation on different explosion accident occurrence frequencies and corresponding different explosion overpressures to obtain an anti-explosion value curve of the building; and determining the target blast resistance value of the building from a blast resistance value curve of the building according to an acceptable frequency of occurrence of blast accidents for the building.
Optionally, the determining the occurrence frequency of the explosion accident of the explosion source includes: determining a leak frequency of the explosive source; determining a firing probability of the explosive source; determining the weather condition probability of the area where the explosion source is located; determining an explosion probability of the explosion source; and taking the product of the leakage frequency, the ignition probability, the weather condition probability, and the explosion probability as the explosion accident occurrence frequency of the explosion source.
Optionally, the determining the leakage frequency of the explosive source includes calculating the leakage frequency of the explosive source according to the following formula:
F(d)=(a+cVn)dm/b
F(d1-d2)=F(d1)-F(d2)
wherein, F (d) represents the frequency of the explosion source generating leakage not less than d aperture, and the unit is times/year; f (d)1-d2) The range of the explosive source generating aperture is represented as d1To d2Frequency of pore size leakage in units of times per year; v is the volume of the explosive source in mm3;d,d1,d2The diameter of the leakage hole is d1 is not more than d2, and the unit is mm; a, b, c, n, m represent constants associated with the source of the explosion and the leakage scenario, respectively.
Optionally, the determining the firing probability of the explosion source includes: acquiring the temperature in the technological process of the explosive source and the self-ignition point of the explosive source; calculating the firing probability of the source of the explosion according to the following formula:
Figure BDA0002546521740000041
wherein, pai is the ignition probability, T is the temperature in the process of the explosive source, and AIT is the self-ignition point of the explosive source.
Optionally, the determining the explosion probability of the explosion source includes calculating the explosion probability according to the following formula:
POEGD=0.3×MCHEM×MMAGE×MIN/OUT×FEP
wherein POEGD is the explosion probability, MCHEMIs a chemical active factor, MMAGETo release the size factor, MIN/OUTFEP is the probability of failure of an explosion prevention measure, an indoor-outdoor factor.
Correspondingly, the embodiment of the invention also provides an upgrading and modifying system for a building, which comprises: the acquisition device is used for acquiring a target anti-explosion value of the building; the detection device is used for detecting the strength of the building, wherein the strength comprises the compressive strength of a concrete structure and mortar, the tensile strength of reinforcing steel bars and the shear strength of brick walls; the shock wave action device is used for acting the explosion shock wave corresponding to the target anti-explosion prevention value on a simulated building of the building; calculating means for calculating a ductility ratio or a bearing angle of a structural member of the simulated building after experiencing the blast shock wave action from the strength of the building; and the determining device is used for determining the structure as a weak point of the building under the condition that the ductility ratio of the structure is greater than the ductility ratio threshold or the support rotation angle is greater than the support rotation angle threshold, so that the anti-explosion upgrading transformation is carried out on the weak point.
Optionally, the calculating means calculating the ductility ratio or the support angle of the simulated building after experiencing the blast shock wave action comprises:
calculating a ductility ratio of the structural member according to the following formula:
Figure BDA0002546521740000042
calculating a seat angle of the structural member according to the following formula:
Figure BDA0002546521740000051
wherein the content of the first and second substances,
Xm=R/k
k=I/L0 3
Figure BDA0002546521740000052
Figure BDA0002546521740000053
Figure BDA0002546521740000054
wherein μ is the ductility ratio, XmRepresenting the elastoplastic deformation of said structural member after the action of said explosive shock wave, XyRepresenting the deformation of the structural member at the elastic limit, theta representing the angle of rotation of the support, L0Representing the span of the structural member, R representing the reflected pressure generated by the blast shock wave, k representing the stiffness of the structural member, I representing the section moment of inertia of the structural member, b representing the section width of the structural member, d representing the section effective height of the structural member, AsReinforcement area of the structural member, ES-expressing the tensile strength of said bars, EcdIndicating the compressive strength of the concrete structure and mortar or the shear strength of the brick wall.
Optionally, the obtaining device includes: the explosive source determining device is used for determining explosive sources within a preset distance of the building; the explosion accident occurrence frequency determining device is used for determining the explosion accident occurrence frequency of the explosion source; the explosion overpressure determining device is used for carrying out explosion simulation on the explosion source aiming at different explosion accident occurrence frequencies so as to determine different explosion overpressures of the explosion source; the curve simulation device is used for carrying out curve simulation on different explosion accident occurrence frequencies and corresponding different explosion overpressures so as to obtain an anti-explosion value curve of the building; and blast resistance value determining means for determining the target blast resistance value of the building from a blast resistance value curve of the building in accordance with an acceptable frequency of occurrence of blast accidents for the building.
Optionally, the device for determining the frequency of the explosion accident includes: a leakage frequency determination module for determining a leakage frequency of the explosive source; a firing probability determination module for determining a firing probability of the explosion source; the meteorological condition probability determining module is used for determining the meteorological condition probability of the area where the explosion source is located; an explosion probability determination module for determining an explosion probability of the explosion source; and an explosion accident occurrence frequency calculation module for taking the product of the leakage frequency, the ignition probability, the weather condition probability and the explosion probability as the explosion accident occurrence frequency of the explosion source.
Optionally, the leakage frequency determining module is configured to determine the leakage frequency of the explosive source according to the following formula:
F(d)=(a+cVn)dm/b
F(d1-d2)=F(d1)-F(d2)
wherein, F (d) represents the frequency of the explosion source generating leakage not less than d aperture, and the unit is times/year; f (d)1-d2) The range of the explosive source generating aperture is represented as d1To d2Frequency of pore size leakage in units of times per year; v is the volume of the explosive source in mm3;d,d1,d2The diameter of the leakage hole is d1 is not more than d2, and the unit is mm; a, b, c, n, m represent constants associated with the source of the explosion and the leakage scenario, respectively.
Optionally, the firing probability determining module is configured to determine the firing probability of the explosion source according to the following steps: acquiring the temperature in the technological process of the explosive source and the self-ignition point of the explosive source; calculating the firing probability of the source of the explosion according to the following formula:
Figure BDA0002546521740000061
wherein, pai is the ignition probability, T is the temperature in the process of the explosive source, and AIT is the self-ignition point of the explosive source.
Optionally, the explosion probability determination module calculates the explosion probability according to the following formula:
POEGD=0.3×MCHEM×MMAGE×MIN/OUT×FEP
wherein POEGD is the explosion probability, MCHEMIs a chemical active factor, MMAGETo release the size factor, MIN/OUTFEP is the probability of failure of an explosion prevention measure, an indoor-outdoor factor.
Accordingly, the embodiment of the present invention also provides a machine-readable storage medium, which stores instructions for causing a machine to execute the above-mentioned upgrade reconstruction method for a building.
According to the technical scheme, when the building is upgraded and modified, the target anti-explosion value of the building is obtained, the explosion shock wave corresponding to the target anti-explosion value acts on the simulation building, and the weak point of the building is determined according to the ductility or the support corner of the simulation building after the simulation building is subjected to the action of the explosion shock wave, so that the building is upgraded and modified in a targeted manner, the anti-explosion capability of the building is improved, and the safety risk is reduced.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 shows a schematic flow diagram of an upgrade retrofitting method for a building according to an embodiment of the invention;
FIG. 2 illustrates a schematic flow chart of obtaining a target blast resistance value of a building according to an embodiment of the present invention;
FIG. 3 illustrates a schematic diagram of an example graph of blast resistance values for a building;
FIG. 4 illustrates a flow diagram for determining the frequency of an occurrence of an explosion event of an explosive source in accordance with an embodiment of the present invention;
FIG. 5 shows a schematic view of a wind rose;
FIG. 6 illustrates a schematic flow diagram for determining explosive overpressure of an explosive source according to an embodiment of the present invention; and
fig. 7 shows a block diagram of an upgrade retrofitting system for a building according to an embodiment of the invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
In any embodiment of the invention, the explosion proof value means the explosion pressure that the building needs to resist.
Example one
Fig. 1 illustrates an upgrade retrofitting method for a building according to an embodiment of the present invention. As shown in fig. 1, an embodiment of the present invention provides an upgrade reconstruction method for a building, which includes steps S110 to S150.
In step S110, a target explosion-proof value of the building is acquired.
The building may be a building in the petrochemical industry, and particularly an important in-service building, and may include, for example, a factory-wide office building, a central control room, a central laboratory, a main substation, a cabinet room, a personnel-intensive outside operating room, and the like. These important buildings, once damaged by the blast shock waves, can cause serious personnel and property damage.
When obtaining a target anti-explosion value of a building, an anti-explosion value curve of the building may be obtained according to the explosion accident occurrence frequency of the explosion sources around the building and different explosion overpressure corresponding to different explosion accident occurrence frequencies, and then the target anti-explosion value of the building may be determined from the anti-explosion value curve of the building according to the acceptable explosion accident occurrence frequency for the building. The target blast resistance value is the blast overpressure that the building is expected to resist.
In step S120, the strength of the building is detected.
The strength includes compressive strength of concrete structures and mortar, tensile strength of steel bars, and shear strength of brick walls. That is, the compressive strength of concrete structures such as beams, columns and roof panels of buildings and main detectors of mortar; the tensile strength of the steel bar is mainly detected; the shear strength of brick walls is mainly tested. Methods of detecting the strength of a building include, but are not limited to: springback method, ultrasonic springback synthesis method, core drilling method, pulling out method, impact echo method, radar method, infrared imaging method, magnetic measurement method and the like.
In step S130, an explosion blast corresponding to the target explosion-proof value is applied to a simulated building of the building.
The simulated building may be a structural or physical model of a building block. That is, the strength of the building can be considered when the building is simulated by simulating the building in an equal proportion or simulating the building in a certain reduction proportion. The strength of the simulated building and the strength of the original building need to be substantially the same.
The detonation may be carried out using a detonation device capable of producing a target blast resistance value to obtain the detonation shock wave.
In step S140, a ductility ratio or a support angle of a structural member of the simulated building after undergoing the blast shock wave action is calculated from the strength of the building.
The method is mainly used for evaluating the bearing capacity and the damage condition of structures such as columns, beams, walls, doors, windows and the like of buildings under the explosion impact. Evaluation methods include, but are not limited to: building structure time-course analysis method, dynamic analysis method, equivalent static load method, CAE calculation method and the like.
Calculating a ductility ratio of the structural member according to the following formula:
Figure BDA0002546521740000091
calculating a seat angle of the structural member according to the following formula:
Figure BDA0002546521740000092
wherein the content of the first and second substances,
Xm=R/k (3)
k=I/L0 3 (4)
Figure BDA0002546521740000101
Figure BDA0002546521740000102
Figure BDA0002546521740000103
wherein μ is the ductility ratio, XmRepresenting the elastoplastic deformation of said structural member after the action of said explosive shock wave, XyRepresenting the deformation of the structural member at the elastic limit, theta representing the angle of rotation of the support, L0Representing the span of the structural member, R representing the reflected pressure generated by the blast shock wave, k representing the stiffness of the structural member, I representing the section moment of inertia of the structural member, b representing the section width of the structural member, d representing the section effective height of the structural member, AsReinforcement area of the structural member, ES-expressing the tensile strength of said bars, EcdIndicating the compressive strength of the concrete structure and mortar or the shear strength of the brick wall.
The reflection pressure R generated by the explosion shock wave may be equal to the explosion overpressure corresponding to the target explosion-proof value. Xy,L0,k,b,d,AsThe value of (c) can be obtained in advance.
In step S150, in the case that the ductility ratio of the structure is greater than the ductility ratio threshold or the support rotation angle is greater than the support rotation angle threshold, the structure is determined as a weak point of the building, so that upgrading and reconstruction are performed on the weak point.
The ductility ratio threshold may be an allowable ductility ratio of the structural member, or any other suitable value as desired. The seat rotation angle threshold may be a seat rotation angle allowable value of the structural member, or may be any other suitable value as needed.
Table 1 shows allowable ductility ratios or support rotation angle allowable values of the structural members. If the ductility ratio or the support corner of a certain structure is larger than the allowable value, the structure can be determined as a weak point of a building, and the structure needs to be subjected to anti-knock upgrading modification.
TABLE 1
Figure BDA0002546521740000111
After finding the weak point of the building under the explosion impact, the weak point can be engineered by adopting a targeted reinforcement measure, so that the structural bearing capacity of the building under the explosion impact is improved. Measures taken include, but are not limited to, adding carbon fiber, sticking steel, high pressure grouting, reinforcement of steel, polyurea coatings, such as: CFRP, GFRP, AFRP, BFRP and the like. Furthermore, the anti-explosion reconstruction can be carried out on the beam column, the wall, the door and window, the ventilation opening and the cable through-wall part of the building according to the damage condition of the building structure.
For the modified building, a simulated building can be constructed, namely a structural model of the modified building is built or a physical model is built for verification. For example, the blast shock wave corresponding to the target blast resistance value may be applied to a simulated building of the modified building, and the ductility ratio or the support angle of the simulated building after the blast shock wave is applied may be calculated from the strength of the modified building. Therefore, whether the modified building meets the target anti-explosion fortification value or not is determined, and if not, the weak point can be further modified.
According to the method for upgrading and reconstructing the building provided by the embodiment of the invention, the weak points of the building are obtained according to the target anti-explosion value, so that the building is upgraded and reconstructed in a targeted manner, the anti-explosion capability of the building is improved, the safety risk is reduced, and the production is not influenced by the upgrading and reconstruction.
Example two
The difference between the present embodiment and the first embodiment is only in obtaining the target anti-explosion value of the building, and other working principles and benefits are similar to the embodiments, which will not be described herein again. Fig. 2 is a schematic flow chart illustrating a process for obtaining a target explosion-proof value of a building according to an embodiment of the present invention, and as shown in fig. 2, the target explosion-proof value of the building may be obtained according to steps S210 to S250.
And step S210, determining an explosion source within a preset distance of the building.
Through the analysis of the overall plane arrangement of the periphery of the building, the device units of the possible explosion sources and other explosion hazard sources are determined, wherein the explosion sources include but are not limited to: physical explosion sources caused by overpressure in vessels (gas cylinders, pressure vessels, boilers, pipelines), chemical explosion sources (TNT decomposition explosion, VCE explosion, dust explosion), etc. Specifically, it can be determined whether the raw materials, intermediate products and final products stored and reacted in the peripheral devices and units of the building have the explosion danger. If the material is a material with explosion danger, judging whether the material has the explosion danger or not by combining the operation temperature and the operation pressure of the material; if the material has the explosion danger under the process operation temperature and the operation pressure, judging whether serious accidents are caused or not by combining the total stock of the material; if serious accidents are possible, the device involved in the material with explosion danger is determined as the explosion danger source.
Furthermore, for the identified explosion hazard source, the explosion hazard source is divided into different nodes according to the process flow of the explosion hazard source device and by combining the danger characteristics and distribution of the explosion hazard source, and the process danger is analyzed by adopting an identification method for each node to determine a specific dangerous process unit. The explosion source in the embodiment of the invention refers to the dangerous process unit, and the subsequent calculation is also based on the dangerous process unit. The identification methods include, but are not limited to, any one or more of: process Hazard Analysis (PHA), checklists, hazard and operability (HAZOP), BowTie analysis, protective layer analysis (LOPA), failure mode and outcome analysis (FMEA), Quantitative Risk Assessment (QRA), CFD and CAE based assessment of consequences of an explosion, wind tunnel experiment based assessment of an explosion of a leak, and the like.
The preset distance in any embodiment of the present invention can be set to any suitable value according to the requirement.
And step S220, determining the explosion accident occurrence frequency of the explosion source.
The frequency of the explosion accident is mainly influenced by the leakage frequency of the explosion source, the ignition probability of the explosion source, the weather condition probability of the area where the explosion source is located, the explosion probability of the explosion source and other factors. By determining these factors, the frequency of the occurrence of an explosion event of the source of the explosion can be determined.
And step S230, carrying out explosion simulation on the explosion source aiming at different explosion accident occurrence frequencies so as to determine different explosion overpressures of the explosion source.
The frequency of the explosion accident of the explosion source is different under different meteorological condition probabilities and different aperture sizes. The corresponding explosion overpressure of the explosion source can be calculated for different explosion accident occurrence frequencies.
And S240, performing curve simulation on different explosion accident occurrence frequencies and corresponding different explosion overpressures to obtain an anti-explosion value curve of the building.
The explosion accident occurrence frequency and the explosion overpressure have one-to-one corresponding values, and the explosion resistance value curve of the building relative to the explosion source can be obtained by simulating a plurality of pairs of the explosion accident occurrence frequency and the explosion overpressure. Under the condition that a plurality of explosive sources exist within a preset distance of a building, an anti-explosion value curve can be obtained for each explosive source. And taking the anti-explosion value curves aiming at all the explosion sources as the anti-explosion value curves of the building.
Step S250, determining the target explosion-proof value of the building from an explosion-proof value curve of the building according to the acceptable explosion accident occurrence frequency aiming at the building.
FIG. 3 shows a schematic diagram of an example graph of blast resistance values for a building. In fig. 3, the ordinate represents the frequency of occurrence of an explosion accident, and the abscissa represents the explosion overpressure. According to the frequency values of the vertical coordinates of different enterprises with different risk acceptance standards, and the acceptable explosion accident occurrence frequency of the enterprise, the curve diagram can be checked to obtain the corresponding explosion overpressure, and the corresponding explosion overpressure can be used as the target explosion defense value of the building of the enterprise.
The method for determining the anti-explosion value of the building provided by the embodiment includes the steps of firstly determining the explosion accident occurrence frequency of an explosion source within a preset distance of the building and the overpressure of the explosion source under different explosion accident occurrence frequencies, and then performing curve simulation on the two to obtain an anti-explosion value curve of the building, so that the anti-explosion value of the building can be quantitatively determined according to the acceptable explosion accident occurrence frequency of the building, a construction or reconstruction basis is provided for the anti-explosion design of the building, and the method is also suitable for protecting the building according to local conditions.
EXAMPLE III
The difference between this embodiment and the first or second embodiment is only the determination of the occurrence frequency of the explosion accident of the explosion source, and other working principles and benefits are similar to those of the first or second embodiment, which will not be described again here. Fig. 4 is a flowchart illustrating a process of determining an occurrence frequency of an explosion accident of an explosion source according to an embodiment of the present invention, and as shown in fig. 4, the occurrence frequency of the explosion accident of the explosion source may be determined according to steps S402 to S410.
In step S402, the leakage frequency of the explosive source is determined.
The number of reactors, towers, pumps, flanges, valves, pipelines and the like in the device and the process parameters of each device are mastered by acquiring a process unit P & ID drawing of the device of the explosive source, and the frequency of the device of the explosive source with leakage of different sizes is analyzed and determined. The leakage equipment may include process piping, process vessels, centrifugal pumps, positive displacement pumps, centrifugal compressors, reciprocating compressors, shell and tube heat exchangers, plate heat exchangers, air coolers, filters, long pipes, and the like.
Calculating the leakage frequency of the explosive source according to the following formula:
F(d)=(a+cVn)dm/b (8)
F(d1-d2)=F(d1)-F(d2) (9)
wherein, F (d) represents the frequency of the explosion source generating leakage not less than d aperture, and the unit is times/year; f (d)1-d2) The range of the explosive source generating aperture is represented as d1To d2Frequency of pore size leakage in units of times per year; v is the volume of the explosive source in mm3;d,d1,d2The diameter of the leakage hole is d1 is not more than d2, and the unit is mm; a, b, c, n, m represent constants associated with the source of the explosion and the leakage scenario, respectively.
In step S404, the firing probability of the explosion source is determined.
When evaluating the probability of ignition inside the process equipment, the following factors should be considered: historical experience; explosive zoning within process equipment; the probability of failure of internal equipment or components due to improper installation; the possibility of static electricity generation in the material; accumulation of static electricity or poor grounding, etc.; sparks occurring under normal or abnormal conditions; the gas phase line is connected to other ignition sources; heat of absorption (e.g., activated carbon bed); internal and external temperatures; materials with low self-ignition points; a low ignition energy material; an autoxidisable material; internal normal or abnormal chemical reactions; thermal operations, including adjacent equipment; moving the equipment; and (4) adiabatic compression.
The present embodiment mainly considers the probability of ignition caused by autoignition. The temperature in the process of the explosive source and the self-ignition point of the explosive source can be obtained firstly when the ignition probability is calculated. The temperature during the process of the explosive source can be obtained from actual measurements, and here the highest or average temperature during the process of the explosive source can be taken. The self-ignition point of the explosive source can be determined according to the material of the explosive source. The probability of ignition of the source of the explosion can then be calculated according to the following formula:
Figure BDA0002546521740000151
wherein, pai is the ignition probability, T is the temperature in the process of the explosive source, and AIT is the self-ignition point of the explosive source.
Alternatively, Pai may be assumed to be 1 for a spark-generating material or source of an explosion.
In step S406, the weather condition probability of the area in which the explosion source is located is determined.
For a leakage accident, different wind directions lead to different explosion accident consequences, and the meteorological condition probability refers to the frequency of the explosion accidents caused by different wind direction frequencies. The weather condition probability may be obtained from the wind rose by obtaining the wind rose of the area in which the source of the explosion is located from a weather station. Wind rose diagram, also called wind direction frequency rose diagram, is a percentage value of each wind direction and wind speed according to the average statistics of a region for years and is drawn according to a certain proportion, as shown in fig. 5, and according to fig. 5, the wind frequency (i.e. the weather condition probability) of each direction can be determined to be roughly: north 0.1, south 0.3, west 0.1, east 0.05, north-west 0.2, etc. The probability of visible weather conditions may have multiple values, and thus the frequency of the occurrence of the finally calculated explosion accident may have multiple values.
For a certain leakage, the consequences of leakage diffusion accidents in different wind directions need to be considered, and the occurrence frequency of the wind direction needs to be considered. And comprehensively determining the severity of the leakage accident consequence by combining the accident consequences and the occurrence frequency under different wind directions.
In step S408, the probability of explosion of the explosion source is determined.
The probability of explosion can be calculated according to the following formula:
POEGD=0.3×MCHEM×MMAGE×MIN/OUT×FEP (11)
wherein POEGD is the explosion probability, MCHEMIs a chemical active factor, MMAGETo release the size factor, MIN/OUTFEP is the probability of failure of an explosion prevention measure, an indoor-outdoor factor.
MCHEMThe default value is 1. M if the base layer flow combustion speed FBV is less than 45cm/sCHEM0.5; if the base layer flow combustion speed FBV is less than or equal to 45cm/s and less than 75cm/s, MCHEM1.0; if the combustion speed of the base layer flow is less than or equal to 75cm/s FBV, MCHEM=2.0。
MMAGEThe following calculation method is adopted:
(1) when the explosion source is liquid and knows the liquid discharge:
MMAGE=MMAG-Amount Released(liquid)=(Amount Released/5000)0.3 (12)
MMAG-Amount Released(liquid)the explosive source is liquid and the chemical activity factor when the liquid discharge amount is known.
(2) When the explosive source is liquid and the size of the liquid vent hole is known:
MMAGE=MMAG-Hole Diameter(liquid)=(Hole Diameter)0.6 (13)
MMAG-Hole Diameter(liquid)the explosive source is liquid and the chemical activity factor is known when the liquid vent pore size is large.
(3) When the explosion source is gas and knows the liquid discharge:
MMAGE=MMAG-Amount Released(vapor)=(Amount Released/5000)0.5 (14)
(4) when the explosive source is gas and the size of the liquid discharge aperture is known:
MMAG-Hole Diameter(vapor)=(Hole Diameter) (15)
in the formulas (5) to (8), the Amount discharged represents the discharge Amount in Kg/h, and the Hole Diameter represents the pore size in mm. The amount of the bleed can be determined comprehensively from the pressure, the temperature and the reaction medium in the reactor.
When the bleeding amount is more than 0.3 and less than or equal to 3 and the bleeding pore diameter is more than or equal to 0.01 and less than or equal to 2, the limit value is taken, for example, the bleeding amount is less than 0.3kg/h, 0.3kg/h is taken, and the bleeding amount is more than 3kg/h, and 3kg/h is taken. When the bleed amount and the bleed aperture are known at the same time, the average of the two calculated values can be taken.
If in the process zone, MIN/OUT1 is ═ 1; if in a tank farm or other remote low density area, MIN/OUT0.5; if indoors, MIN/OUT=1.5。
The FEP may be a value predetermined empirically, and the PEP may range from 0 to 1.
In step S410, the product of the leakage frequency, the ignition probability, the weather condition probability, and the explosion probability is used as the frequency of the explosion accident of the explosion source.
That is, the frequency of occurrence of an explosion accident can be calculated according to the following formula: the explosion accident occurrence frequency is leakage frequency multiplied by weather condition probability multiplied by ignition probability multiplied by explosion probability. It is understood that the calculation method of the explosion accident occurrence frequency is not limited to this, and a correction coefficient may also be added to the calculation formula to obtain a more accurate explosion accident occurrence frequency.
Example four
The present embodiment is different from any of the foregoing embodiments in the manner of determining explosion overpressure, and other operation principles and benefits are similar to those of the foregoing embodiments, and will not be described herein again. Fig. 6 shows a schematic flow diagram for determining the explosion overpressure of an explosion source according to an embodiment of the invention. As shown in fig. 6, the explosion overpressure of the explosion source may be determined according to steps S602 to S608.
In step S602, the volume of the explosive source is determined.
In step S604, the explosive source energy of the explosive source is determined according to the volume of the explosive source.
The energy of the explosive source is different under different wind directions. The wind direction corresponds to the occurrence frequency of the explosion accidents one by one, so that the energy of the explosion source corresponds to the occurrence frequency of the explosion accidents one by one. The explosive source energy is the combustion energy of the fuel-air mixture within the explosive source.
And calculating the leakage accident possibly occurring in the explosion source, determining the amount of leaked combustible gas, comparing the amount with the volume of the explosion source, determining the amount of combustible gas contributing to the explosion shock wave, and further determining the energy of the explosion source.
The source of the explosion can be modeled as a regular geometric body, such as a rectangular body (measuring its length, width, height b1, b2, b3, respectively), a cylinder (measuring its height and diameter lc and dc, respectively), a sphere (measuring its diameter ds), and the like. And then calculating the volume as the volume of the explosion source according to the parameters of the geometric body.
There may be many potentially hazardous areas in a petrochemical plant area, with different hazardous areas potentially constituting one large explosive source if they are close together and a plurality of small explosive sources if they are far apart. The different shapes of the potential danger areas have an influence on whether a large explosion source is formed or not. The volume may specifically be determined according to the following steps:
(1) changing the equipment in the potentially hazardous area to a basic geometry: rectangles (length, width, height b1, b2, b3, respectively), cylinders (height and diameter lc and dc, respectively), balls (diameter ds);
(2) assuming an ignition position in the blockage area, so that the propagation direction of the flame relative to each device is known; the blocking area refers to an area where an explosion accident may occur.
(3) Determining the direction of the obstacle: d1 is the smallest dimension in the plane assuming the device is perpendicular to the direction of flame propagation, D2 is the device dimension parallel to the direction of flame propagation (cylinder: D1 may be dc or lc, cube: D1 may be b1, b2, b3, sphere: D1 is ds);
(4) build up of the hindered zone: an obstacle belonging to the obstacle area should satisfy the following condition: the distance from the center of the device to the center of any obstacle within the obstacle zone is less than 10D1 or 1.5D 2; an obstacle does not belong to the obstacle zone if it is more than 25m from the outer boundary of the obstacle zone.
(5) Defining a cube: defining a cube within the occlusion region, including all obstructions within the occlusion region, any obstruction within the occlusion region being less than 10D1 or 1.5D2 from the constrained surface; part of the tall chimney, the upper part of the distillation column or the pipe gallery connecting the pipes may not belong to this zone and these devices need to form respective hindering zones.
(6) Subdividing a large cube into a plurality of small cubes: in defining a cube, this cube would be defined as being oversized for a device containing the obstructed area, including a portion of the completely unobstructed area, the volume of which is reduced by subdividing the large cube. The volume after subtracting this part of the volume is the volume of the explosive source.
The determined volume of the explosive source is actually the volume of the combustible-air mixture in the explosive source, and the energy of the explosive source can be calculated according to the following formula:
E=aWVexplosive source (16)
In the formula: e is the energy of the explosive source and has the unit of J; vExplosive sourceIs the volume of explosive source in m3(ii) a a is a correlation constant; w is an active factor of different materials.
In step S606, the explosive source strength of the explosive source is determined.
The intensity of the explosive source can be determined according to the ignition energy, the blocking degree and the restrained degree of the explosive source.
The ignition energy is called weak ignition energy when the ignition energy is less than 100mJ, and is called strong ignition energy when the ignition energy is not more than 100 mJ. Ignition energy refers to the energy of an ignition source. For example, for the same explosion source, tribostatic electricity may ignite the same, and for matches, both static electricity and matches belong to the ignition source, and their ignition energy is different, and the resulting explosion effect may be different. Therefore, ignition energy needs to be considered.
The degree of blockage is determined by the condition of the obstruction in the area of the source of the explosion. Strong obstruction means that the volume of the obstacles is more than 30% of the volume of the whole obstruction area and the distance between the obstacles is less than 3 m; a weak obstruction indicates that an obstruction exists in the area, but the first two conditions cannot be met simultaneously.
The degree of constraint is characterized by both the presence and absence of constraints. The existence of constraints means that the combustible gas cloud of the explosive source is limited by 2 or 3 solid faces; the absence of a constraint means that the flammable gas cloud of the explosive source is limited to only one surface of the earth's surface.
After determining the ignition energy, the degree of blockage, and the degree of confinement of the explosive source, the intensity level may be determined according to table 2. The intensity ratings are divided into 1-10 ratings in table 2, where 10 represents the highest rating and 1 represents the lowest rating. It is clear here by way of example how the specific intensity level is determined. For example, if the ignition energy of a certain explosive source is strong ignition energy, the blocking degree is strong blocking degree, and there is a constraint, and the intensity level range thereof can be determined to be 7-10 levels according to table 1, then one level from 7-10 levels may be selected as the intensity level Q of the explosive source according to actual conditions.
Table 2 judging table of intensity level of explosive source
Figure BDA0002546521740000201
In step S608, the explosion overpressure at the preset distance from the explosion source is determined according to the energy of the explosion source and the intensity of the explosion source. Specifically, the explosion overpressure can be calculated according to the following formula:
Figure BDA0002546521740000202
wherein, P is explosion overpressure, the unit Pa is the overpressure duration, and the unit s is the overpressure duration; x is a coefficient related to pressure; y is a coefficient related to energy; e is the energy of an explosion source; l is the distance of the overpressure calculation point from the source of the explosion (i.e., the preset distance); r is the radius of the explosive source.
In equation (10), the overpressure duration t is calculated according to the following equation:
Figure BDA0002546521740000211
wherein v isaIs the speed of sound in air, p0Is ambient atmospheric pressure and E is the explosive source energy.
In equation (10), the radius R of the explosive source is calculated according to the following equation:
Figure BDA0002546521740000212
the calculation method of the explosion overpressure in the embodiment of the present invention is not limited to this, and for example, table 1 and equations (17) to (19) may be slightly modified to obtain the explosion overpressure. The calculation method of the explosion overpressure can accurately and quickly calculate the explosion overpressure of the explosion source.
EXAMPLE five
Fig. 7 shows a block diagram of an upgrade retrofitting system for a building according to an embodiment of the invention. As shown in fig. 7, an embodiment of the present invention further provides an upgrade retrofitting system for a building, including: an obtaining device 810, configured to obtain a target anti-explosion value of the building; a detection device 820 for detecting the strength of the building; a shock wave acting device 830 for acting an explosive shock wave corresponding to the target blast resistance value on a simulated building of the building; a calculating means 840 for calculating a ductility ratio or a support angle of said simulated building after experiencing said blast shock wave action based on said strength of said building; and a determining device 850, which is used for determining the weak point existing in the building according to the ductility ratio or the support corner so as to upgrade and modify the weak point.
The calculation means may calculate the ductility ratio or the support angle of the simulated building after experiencing the blast shock wave action using equations (1) - (7).
In some optional cases, the obtaining means may include: the explosive source determining device is used for determining explosive sources within a preset distance of the building; the explosion accident occurrence frequency determining device is used for determining the explosion accident occurrence frequency of the explosion source; the explosion overpressure determining device is used for carrying out explosion simulation on the explosion source aiming at different explosion accident occurrence frequencies so as to determine different explosion overpressures of the explosion source; the curve simulation device is used for carrying out curve simulation on different explosion accident occurrence frequencies and corresponding different explosion overpressures so as to obtain an anti-explosion value curve of the building; and blast resistance value determining means for determining the target blast resistance value of the building from a blast resistance value curve of the building in accordance with an acceptable frequency of occurrence of blast accidents for the building.
In some optional cases, the explosion accident occurrence frequency determining means may include: a leakage frequency determination module for determining a leakage frequency of the explosive source; a firing probability determination module for determining a firing probability of the explosion source; the meteorological condition probability determining module is used for determining the meteorological condition probability of the area where the explosion source is located; an explosion probability determination module for determining an explosion probability of the explosion source; and an explosion accident occurrence frequency calculation module for taking the product of the leakage frequency, the ignition probability, the weather condition probability and the explosion probability as the explosion accident occurrence frequency of the explosion source.
The leakage frequency determination module may determine the leakage frequency of the explosive source, for example, according to equation (8) or (9).
The ignition probability determination module may first obtain the temperature of the explosive source in the process, the self-ignition point of the explosive source, and then calculate the ignition probability of the explosive source according to equation (10).
The explosion probability determination module may calculate the explosion probability of the explosion source according to equation (11).
The explosion overpressure determination device is used for calculating the explosion overpressure of the explosion source according to the following steps: determining a volume of the explosive source; determining the explosive source energy of the explosive source according to the volume of the explosive source; determining an explosive source intensity of the explosive source; and determining explosion overpressure at the preset distance from the explosion source according to the energy of the explosion source and the intensity of the explosion source.
When the building is upgraded and modified, a target anti-explosion value of the building is obtained, the explosion shock wave corresponding to the target anti-explosion value acts on the simulated building, and then the weak point of the building is determined according to the ductility or the support corner of the simulated building after the explosion shock wave acts, so that the building is upgraded and modified in a targeted manner, the anti-explosion capability of the building is improved, and the safety risk is reduced.
The specific working principle and benefits of the system for upgrading and reconstructing a building provided by the embodiment of the present invention are the same as those of the method for upgrading and reconstructing a building provided by the embodiment of the present invention, and will not be described herein again.
Accordingly, the embodiment of the present invention further provides a machine-readable storage medium, which stores instructions for causing a machine to execute the method for upgrading and transforming a building according to any embodiment of the present invention.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (15)

1. A method for blast resistant up-grading renovation of a building, the method comprising:
acquiring a target anti-explosion value of the building;
detecting the strength of the building, wherein the strength comprises the compressive strength of a concrete structure and mortar, the tensile strength of a steel bar and the shear strength of a brick wall;
applying the explosion shock wave corresponding to the target anti-explosion protection value to a simulated building of the building;
calculating a ductility ratio or a support angle of a structural member of the simulated building after experiencing the blast shock wave action from the strength of the building; and
and in the case that the ductility ratio of the structure is greater than the ductility ratio threshold value or the support rotation angle is greater than the support rotation angle threshold value, determining the structure as a weak point of the building, and performing anti-knock upgrading modification on the weak point.
2. The method of claim 1, wherein calculating a ductility ratio or a bearing angle of a structural member of the simulated building after experiencing the blast shock wave action from the strength of the building comprises:
calculating a ductility ratio of the structural member according to the following formula:
Figure FDA0002546521730000011
calculating a seat angle of the structural member according to the following formula:
Figure FDA0002546521730000012
wherein the content of the first and second substances,
Xm=R/k
k=I/L0 3
Figure FDA0002546521730000013
Figure FDA0002546521730000021
Figure FDA0002546521730000022
wherein μ is the ductility ratio, XmRepresenting the elastoplastic deformation of said structural member after the action of said explosive shock wave, XyRepresenting the deformation of the structural member at the elastic limit, theta representing the angle of rotation of the support, L0Representing the span of the structural member, R representing the reflected pressure generated by the blast shock wave, k representing the stiffness of the structural member, I representing the section moment of inertia of the structural member, b representing the section width of the structural member, d representing the section effective height of the structural member, AsReinforcement area of the structural member, ESShowing the tensile strength of the above-mentioned reinforcing bar, EcdIndicating the compressive strength of the concrete structure and mortar or the shear strength of the brick wall.
3. The method of claim 1, wherein obtaining a target blast resistance value for the building comprises:
determining an explosive source within a preset distance of the building;
determining the frequency of occurrence of explosion accidents of the explosion source;
for different explosion accident occurrence frequencies, carrying out explosion simulation on the explosion source to determine different explosion overpressure of the explosion source;
carrying out curve simulation on different explosion accident occurrence frequencies and corresponding different explosion overpressures to obtain an anti-explosion value curve of the building; and
determining the target blast resistance value for the building from a blast resistance value curve for the building according to an acceptable frequency of occurrence of blast accidents for the building.
4. The method of claim 3, wherein the determining the frequency of occurrence of an explosion event for the explosive source comprises:
determining a leak frequency of the explosive source;
determining a firing probability of the explosive source;
determining the weather condition probability of the area where the explosion source is located;
determining an explosion probability of the explosion source; and
taking the product of the leakage frequency, the ignition probability, the weather condition probability, and the explosion probability as the explosion accident occurrence frequency of the explosion source.
5. The method of claim 4, wherein the determining the leakage frequency of the explosive source comprises calculating the leakage frequency of the explosive source according to the following equation:
F(d)=(a+cVn)dm/b
F(d1-d2)=F(d1)-F(d2)
wherein, F (d) represents the frequency of the explosion source generating leakage not less than d aperture, and the unit is times/year; f (d)1-d2) Presentation instrumentThe range of the explosive source generating aperture is d1To d2Frequency of pore size leakage in units of times per year; v is the volume of the explosive source in mm3;d,d1,d2The diameter of the leakage hole is d1 is not more than d2, and the unit is mm; a, b, c, n, m represent constants associated with the source of the explosion and the leakage scenario, respectively.
6. The method of claim 4, wherein the determining the firing probability of the explosive source comprises:
acquiring the temperature in the technological process of the explosive source and the self-ignition point of the explosive source;
calculating the firing probability of the source of the explosion according to the following formula:
Figure FDA0002546521730000031
wherein, pai is the ignition probability, T is the temperature in the process of the explosive source, and AIT is the self-ignition point of the explosive source.
7. The method of claim 4, wherein said determining the probability of detonation of the source of detonation comprises calculating the probability of detonation according to the formula:
POEGD=0.3×MCHEM×MMAGE×MIN/OUT×FEP
wherein POEGD is the explosion probability, MCHEMIs a chemical active factor, MMAGETo release the size factor, MIN/OUTFEP is the probability of failure of an explosion prevention measure, an indoor-outdoor factor.
8. An explosion-proof upgrade retrofitting system for a building, the system comprising:
the acquisition device is used for acquiring a target anti-explosion value of the building;
the detection device is used for detecting the strength of the building, wherein the strength comprises the compressive strength of a concrete structure and mortar, the tensile strength of reinforcing steel bars and the shear strength of brick walls;
the shock wave action device is used for acting the explosion shock wave corresponding to the target anti-explosion prevention value on a simulated building of the building;
calculating means for calculating a ductility ratio or a bearing angle of a structural member of the simulated building after experiencing the blast shock wave action from the strength of the building; and
and the determining device is used for determining the structure as a weak point of the building under the condition that the ductility ratio of the structure is greater than the ductility ratio threshold or the support rotation angle is greater than the support rotation angle threshold, so that the anti-knock upgrading transformation is carried out on the weak point.
9. The system of claim 8, wherein the computing device calculating a ductility ratio or a support angle of the simulated building after experiencing the blast shock wave action comprises:
calculating a ductility ratio of the structural member according to the following formula:
Figure FDA0002546521730000041
calculating a seat angle of the structural member according to the following formula:
Figure FDA0002546521730000051
wherein the content of the first and second substances,
Xm=R/k
k=I/L0 3
Figure FDA0002546521730000052
Figure FDA0002546521730000053
Figure FDA0002546521730000054
wherein μ is the ductility ratio, XmRepresenting the elastoplastic deformation of said structural member after the action of said explosive shock wave, XyRepresenting the deformation of the structural member at the elastic limit, theta representing the angle of rotation of the support, L0Representing the span of the structural member, R representing the reflected pressure generated by the blast shock wave, k representing the stiffness of the structural member, I representing the section moment of inertia of the structural member, b representing the section width of the structural member, d representing the section effective height of the structural member, AsReinforcement area of the structural member, ESShowing the tensile strength of the above-mentioned reinforcing bar, EcdIndicating the compressive strength of the concrete structure and mortar or the shear strength of the brick wall.
10. The system of claim 8, wherein the means for obtaining comprises:
the explosive source determining device is used for determining explosive sources within a preset distance of the building;
the explosion accident occurrence frequency determining device is used for determining the explosion accident occurrence frequency of the explosion source;
the explosion overpressure determining device is used for carrying out explosion simulation on the explosion source aiming at different explosion accident occurrence frequencies so as to determine different explosion overpressures of the explosion source;
the curve simulation device is used for carrying out curve simulation on different explosion accident occurrence frequencies and corresponding different explosion overpressures so as to obtain an anti-explosion value curve of the building; and
blast resistance value determining means for determining the target blast resistance value of the building from a blast resistance value curve for the building in accordance with an acceptable frequency of occurrence of blast incidents for the building.
11. The system according to claim 10, wherein the explosion incident occurrence frequency determining means comprises:
a leakage frequency determination module for determining a leakage frequency of the explosive source;
a firing probability determination module for determining a firing probability of the explosion source;
the meteorological condition probability determining module is used for determining the meteorological condition probability of the area where the explosion source is located;
an explosion probability determination module for determining an explosion probability of the explosion source; and
and the explosion accident occurrence frequency calculation module is used for taking the product of the leakage frequency, the ignition probability, the meteorological condition probability and the explosion probability as the explosion accident occurrence frequency of the explosion source.
12. The system of claim 11, wherein the leakage frequency determination module is configured to determine the leakage frequency of the explosive source according to the following equation:
F(d)=(a+cVn)dm/b
F(d1-d2)=F(d1)-F(d2)
wherein, F (d) represents the frequency of the explosion source generating leakage not less than d aperture, and the unit is times/year; f (d)1-d2) The range of the explosive source generating aperture is represented as d1To d2Frequency of pore size leakage in units of times per year; v is the volume of the explosive source in mm3;d,d1,d2The diameter of the leakage hole is d1 is not more than d2, and the unit is mm; a, b, c, n, m represent constants associated with the source of the explosion and the leakage scenario, respectively.
13. The system of claim 11, wherein the firing probability determination module is configured to determine the firing probability of the explosive source according to the following steps:
acquiring the temperature in the technological process of the explosive source and the self-ignition point of the explosive source;
calculating the firing probability of the source of the explosion according to the following formula:
Figure FDA0002546521730000071
wherein, pai is the ignition probability, T is the temperature in the process of the explosive source, and AIT is the self-ignition point of the explosive source.
14. The system of claim 11, wherein the detonation probability determination module calculates the detonation probability according to the formula:
POEGD=0.3×MCHEM×MMAGE×MIN/OUT×FEP
wherein POEGD is the explosion probability, MCHEMIs a chemical active factor, MMAGETo release the size factor, MIN/OUTFEP is the probability of failure of an explosion prevention measure, an indoor-outdoor factor.
15. A machine-readable storage medium having stored thereon instructions for causing a machine to perform the method of upgrading a building according to any of claims 1 to 7.
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