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A method for evaluating the collapse probability of steel structures in fire

A steel structure and fire technology, applied in data processing applications, instruments, geometric CAD, etc., can solve problems such as neglect, and achieve the effect of many calculation steps, reasonable design, and simple steps

Inactive Publication Date: 2020-03-17
CHINA UNIV OF MINING & TECH
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  • Abstract
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Problems solved by technology

However, most of the existing collapse risk assessment methods use certain fire scenarios to analyze the collapse probability of structures, ignoring the influence of the uncertainty of random factors in real fires on the collapse probability of structures

Method used

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  • A method for evaluating the collapse probability of steel structures in fire
  • A method for evaluating the collapse probability of steel structures in fire
  • A method for evaluating the collapse probability of steel structures in fire

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Experimental program
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Embodiment Construction

[0044] Such as figure 1 As shown, the method for evaluating the collapse probability of a steel structure in a fire of the present invention includes the following steps:

[0045] Step 1: Determine the probability distribution function of the randomness factor: According to the statistical law followed by the randomness of the tall space building fire, through on-site investigation or data query method, determine the fire randomness factor and its distribution function in the building. Then construct the probability distribution function of random factors.

[0046] Step 2. Design random fire scenes: adopt Latin hypercube method to sample random factors in Latin hypercube, and use probability density function to describe the uncertainty of random factors, so as to determine all the random fire scene groups that may occur in building fires , After statistical analysis of the model output results, the statistical characteristics of the output results are given, thereby quantitativel...

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Abstract

The invention discloses a method for assessing collapse probability of a steel structure in a fire. The method includes steps: 1, determining a probability distribution function of random factors; 2, designing a random fire scene; 3, building a steel structure instability probability model; 4, determining steel structure collapse critical temperature; 5, calculating a temperature field of a large-span steel structure component in a natural fire: 501, building a steel structure heat balance equation; 502, calculating net absorption heat of the steel structure; 503, calculating temperature rise of the steel structure; 6, determining failure probability of the steel structure component. The method is simple in step, reasonable in design, convenient to realize, good in using effect and high in universality, can realize assessment on collapse probability of the steel structure in the fire and makes up the defect that influence of fire randomness is not taken into consideration in existing steel structure collapse probability assessment methods.

Description

Technical field [0001] The invention belongs to the technical field of steel structure collapse risk assessment, and in particular relates to a steel structure collapse probability assessment method based on Latin hypercube sampling. Background technique [0002] The large-span steel structure has excellent mechanical properties and convenient construction technology, making it an ideal choice for building tall and large space buildings. However, this type of building has poor fire resistance, and once a fire occurs, it will cause serious casualties and property losses. Therefore, scientifically carrying out the collapse risk assessment of tall and large space steel structure buildings is very important for fire rescue and emergency command in fire. However, the existing collapse risk assessment methods mostly use certain fire scenarios to analyze the collapse probability of structures, and ignore the influence of the uncertainty of random factors in real fires on the collapse p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q50/08G06Q10/06G06F30/13
CPCG06F30/13G06Q10/0635G06Q50/08
Inventor 张国维赵永昌朱国庆陶海军潘荣亮孟庆璇于淼淼黄迪
Owner CHINA UNIV OF MINING & TECH
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