BSI PD 7974-7:2003
$215.11
Application of fire safety engineering principles to the design of buildings – Probabilistic risk assessment
| Published By | Publication Date | Number of Pages |
| BSI | 2003 | 88 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | PUBLISHED DOCUMENT |
| 2 | Committees responsible for this Published�Document |
| 3 | Contents |
| 7 | Introduction |
| 8 | Figure 1 BS 7974 and the Published Documents |
| 9 | 1 Scope 2 Terms and definitions, symbols and abbreviated terms 2.1 Terms and definitions As Low As Reasonably Practicable assessment availability common mode failure conditional probability consequences deterministic diversity |
| 10 | event extreme value failure cause failure mode fire hazard frequency hazard individual risk initiating event maintenance mean time between failures outcome probability distribution probabilistic model |
| 11 | scenario redundancy reliability revealed fault risk risk to life and health safety societal risk stochastic model tolerable risk 2.2 Symbols and abbreviated terms |
| 14 | 3 Design approach 3.1 General |
| 15 | Figure 2 General approach to probabilistic fire risk assessment |
| 16 | 3.2 Application of probabilistic risk assessment to fire safety engineering |
| 17 | 3.3 Identifying and selecting fire scenarios for deterministic analysis 3.4 Setting input data for deterministic analysis 3.5 Analysis of certain aspects of fire safety in building design 3.6 Analysis of the whole of fire safety of a building design |
| 18 | 4 Acceptance criteria 4.1 General Table 1 Typical types of acceptance criteria 4.2 Comparative criteria 4.3 Absolute criteria |
| 19 | Table 2 Number of deaths per building and the number of deaths per occupant |
| 20 | 5 Standard probabilistic analysis 5.1 General 5.2 Simple statistical analysis |
| 23 | Figure 3 Damage and building size, textile industry |
| 24 | Figure 4 Damage and compartment size, textile industry |
| 25 | 5.3 Logic trees |
| 26 | Figure 5 General form of an event tree Figure 6 Event tree of the early stages of fire event development |
| 28 | Figure 7 Simplified event tree for bus garage fires |
| 29 | Table 3 Discounted cash flow for bus garage sprinkler system |
| 31 | Figure 8 General form of a fault tree |
| 32 | Figure 9 Fault tree for the failure to detect a fire within 5 min of ignition |
| 33 | 5.4 Sensitivity analysis 6 Complex analysis 6.1 General |
| 34 | 6.2 Other statistical models |
| 36 | Figure 10 Probability of area damaged, textile industry |
| 37 | Figure 11 Pareto distribution of area damage – retail premises (assembly areas) |
| 38 | Figure 12 Fire frequency and large losses |
| 39 | Figure 13 The survivor probability distribution of fire loss for each class in the textile�industry |
| 47 | Figure 14 Event trees for sprinklered and non-sprinklered fires |
| 48 | Figure 15 Event trees for sprinklered and non-sprinklered fires in the production areas�of�the textile indu… |
| 50 | 6.3 Reliability analysis |
| 52 | 6.4 Stochastic models |
| 54 | Figure 16 Room layout and corresponding schematic |
| 55 | Figure 17 Probabilistic network of fire spread of room 1 to C |
| 56 | Figure 18 Equivalent fire spread network with 5 min unrated corridor doors |
| 57 | Table 4 Fire spread equivalent network assuming 5 min unrated corridor doors Figure 19 Equivalent fire spread network with self-closing 20 min rated corridor doors Table 5 Equivalent network assuming self-closing 20 min rated corridor doors |
| 58 | 6.5 Monte Carlo analysis |
| 60 | 6.6 Partial safety factors |
| 64 | 6.7 Beta method |
| 66 | Table 6 Probabilities of structural success and failure (normal distribution) |
| 69 | 7 Data 7.1 Collation of data for PRA |
| 73 | 7.2 Key issues in the application of PRA data |
| 74 | Figure 20 Flowchart for checking data suitability 8 Future developments 8.1 General 8.2 Data 8.3 Analysis |
| 75 | Annex A (normative) Tables Table A.1 Probability of fire starting Table A.2 Overall probability of fire starting in various types of occupancy Table A.3 Probability of fire starting within given floor area for various types of�occupancy |
| 76 | Table A.4 Area damage and percentage of fires for each category of fire spread (textile�industry) Table A.5 Area damage and percentage of fires for each category of fire spread (pubs,�clubs,�restaurants – … |
| 77 | Table A.6 Office buildings: frequency distribution of area damage (in terms of number�of�fires) Table A.7 Retail premises: frequency distribution of area damage (in terms of number�of�fires) |
| 78 | Table A.8 Hotels: frequency distribution of damage (in terms of number of fires) Table A.9 Probable damage in a fire: parameters of equation 2 |
| 79 | Table A.10 Spinning and doubling industry: places of origin of fires and sources of ignition Table A.11 Extent of fire spread and average area damaged (Textile industry, U.K.) |
| 80 | Table A.12 Average loss per fire at 1966 prices (£’000) Table A.13 Discovery time and fatal casualties Table A.14 Frequency distribution of number of deaths |
| 81 | Table A.15 Probability of flashover Table A.16 Building characteristics |
| 82 | Table A.17 Reliability data |
