Discussion on fire risk analysis of the most combu

Discussion on performance-based building fire risk analysis

building fire risk analysis is an important part of fire science research. The tensile machine can analyze all the test results. It is a method to judge whether it meets the specification. It includes not only the risk of property loss, but also the risk of life. Because the acceptable level of risk is reflected by people's attitude. Therefore, it is variable and uncertain. People accept different degrees of life risk and property risk. The risk of life cannot be simply measured by a measurement standard, but must consider the value of human life. Using people's attitude towards risk and determining the fire risk of buildings according to the risk probability can better reflect the possible consequences of fire accidents. In recent years, the complexity of building functions and the emergence of new technologies have also brought some new risks and new harm problems, for which people have different reactions to different types of risk problems. Due to the differences in people's understanding of risks, it has also had a certain impact on the current fire prevention code of building design. For example, the relevant provisions of the code for fire protection design of buildings have been modified to meet the new social requirements due to the fire in song and dance entertainment screening and entertainment venues

2 Introduction to two performance-based building fire risk analysis methods

building fire risk analysis method is an important evaluation standard in performance-based design. Nowadays, the more perfect methods include BCA structural system in Australia and building fire protection analysis method (bfsem: T) in the United States

    2. 1 BCA structural system in Australia

the risk assessment model of BCA structural system in Australia CW sale-r isk is a risk assessment model used to quantify the fire safety performance of buildings. Its characteristic is that it uses the fault tree to set up a variety of fire scenarios, each of which has an occurrence probability. What is related to each scenario is the fire development and smoke flow model to get a deterministic reality related to it, and what is related to each actual situation is the reaction model of human behavior and fire brigade rescue

    2. 1.1 the BCA structure system in Australia includes nine parts

volume a, general. Including a 0, the overall description of BCA and the relevant provisions on the application of this method; A 1, the explanation part, explaining the relevant words; A 2. Acceptable design and construction scheme, including the suitability of building materials, evidence of suitability, fire resistance of building elements and early risk index; A 3 easy to use building classification. The classification standard of buildings is given, and the classification is divided, and the situation of conforming to the class is considered. In this part, buildings are divided into 10 categories according to the design and purpose of construction

volume B, building structure. First, give the objectives, function descriptions and performance requirements of this volume, and then give the safety performance regulations recognized in this volume, which respectively give the corresponding load that the building should meet and the requirements of building material construction

volume C, fire resistance part. Firstly, the objectives, function descriptions and performance requirements of this volume are given, and the approved safety regulations are given respectively corresponding to different contents. Part C1 gives the requirements for fire resistance and thermal stability; C2 part gives the requirements for fire compartment and isolation; C3 part gives the opening protection measures, but the dynamic fatigue testing machine and electro-hydraulic servo message universal testing machine are particularly prominent requirements. Give some contents that need to be explained in detail, such as the division of fire resistance rating, the requirements of fire resistance characteristics of external walls, etc

Volume D, channel exit part. First, give the objectives, function descriptions and performance requirements of this volume, and then give the approved safety regulations by content. D1 is the requirement for setting escape routes in buildings; D2 refers to the construction requirements for various types of exports; D3 is the requirement of setting facilities for the disabled. Then, the detailed requirements for stairs, slopes and escalators are given

volume e, public facilities and equipment. Give objectives, function descriptions, performance requirements and approved safety regulations and rules corresponding to different contents. E1 refers to the requirements for fire extinguishing equipment; E2 refers to the requirements for elevator devices; E3 refers to the requirements for emergency lighting, exit indication signs and alarm system

volume f, health and comfort. Give objectives, function descriptions, performance requirements and approved safety regulations and rules corresponding to different contents. F1 refers to the requirements for humidity and weatherproof structure of the room; F2 refers to the requirements for sanitary equipment and other equipment; F3 is the requirement for room size; F4 requirements for general lighting and ventilation; F5 refers to the requirements for sound insulation and sound transmission

volume g, auxiliary requirements. Give objectives, function descriptions, performance requirements and approved safety regulations and rules corresponding to different contents. G1 refers to the requirements for small components and components, mainly for swimming pools, air-conditioned vaults and cellars; G2 requirements for heating equipment, fireplace, chimney and vent pipe; G3 is the construction requirements of the atrium; G4 refers to the requirements for the high area of the building; G5 is the requirement for areas with forest fire trend

volume h, special purpose buildings. It mainly gives requirements for the theater, stage and the hall where public and private parties gather. It is also divided into fire compartment, stage wall structure, seat part, stage exit and other parts

Volume I, maintenance and detection standard part. First, give the objectives, function descriptions and performance requirements of this volume, and then give the approved safety regulations. Including the requirements for installation safety, mechanical ventilation and water heating system

    2. 1.2 overall structure of performance-based design standard

BCA structural system is based on the overall performance requirements and divided into different volumes for discussion according to different aspects required by performance; From the perspective of structure, BCA fully embodies the characteristics of performance-based design. The main body of each volume is divided into four parts, including objectives, function descriptions, performance requirements and approved safety regulations. BCA is more flexible in evaluating the design. On the one hand, it gives some performance-based indicators for the reference of designers and evaluators, and at the same time, it also gives some acceptable evaluation schemes. This makes it more flexible and reasonable

    2. 2 American building fire protection analysis method bfsem

bfsem method believes that all buildings are combinations of space and partitions. For specific buildings, the fire performance analysis should clearly identify the space partition system. Fire itself is also divided into two parts: flame/heat and smoke, which affect buildings, people and various objects at different speeds and in different ways. The evaluation of building fire performance by bfsem method mainly includes five aspects: (1) preventing fire; (2) Flame/thermal analysis (the building limits the fire in its space and partitions through active and passive protection measures); (3) Smoke/gas analysis (the ability of the building to maintain the survivable conditions of the selected space for a specified time); (4) Structural frame analysis (structural frame for unrestrained fire to avoid unacceptable deformation and collapse); (5) Personnel mobility analysis (the time required for personnel to move in the building or arrive at a safe place). In the evaluation process, for various parameters such as the possibility of fire, the possibility of fire expansion in the fire space, the performance of partitions, the spread of fire beyond the fire space, and personnel safety, the user can specify the subjective probability based on experience and engineering judgment, or estimate the possibility of each event based on statistical data. Bfsem provides a comprehensive method to identify the factors that affect the fire performance of buildings. However, there is great uncertainty in determining various evaluation parameters