DIN 18009-2 evacuation simulation

Briefly summarized: The DIN 18009-2

The goal of fire protection is the safety of people in buildings. An evacuation concept must be optimally adapted to the individual conditions on site. For this purpose, engineering methods are used, e.g. evacuation simulations, which virtually test the emergency case and calculate evacuation courses.

Evacuation simulations are used in particular when previous laws and standards do not offer a solution, e.g. in the case of deviations from the state building code or special building regulations, or when facilities are to be optimized in terms of fire protection.

In order to standardize these calculations in the future and to elevate them to the status of a recognized rule of technology, the procedure for evacuation simulations is laid down in DIN 18009-2. It builds on DIN 18009-1, in which the various engineering methods have already been set out.

Series of standards DIN 18009 Fire safety engineering

The specifications in fire protection in Germany are very strict, and the rules and specifications are correspondingly extensive. The need for this has been demonstrated time and again - from the fire at Düsseldorf Airport in the 1990s to the Grenfell Tower accident. In addition to the requirements of the state-specific building codes, more and more standards are being developed to provide proof of protection.

The aim of standardization within the framework of a DIN is to ensure that minimum technical requirements are met and comparable. For fire protection, DIN 18009 summarizes fire protection engineering methods as generally accepted rules of technology. Here, it is standardized how alternative proofs for the fire protection proof can be provided, e.g. the comparison between the necessary and the maximum available evacuation time (RSET vs. ASET) or the procedure for the proof of fire resistance duration of building components.

What is DIN 18009-2 on evacuation simulations all about?

The standard is now extended by a second part on evacuation calculations and defines the procedure for a performance-based verification: Based on the problem, relevant evacuation scenarios are defined and the relevant protection targets are specified. These are evaluated against agreed performance criteria. The most common criteria include clearance time and analysis of congestion, e.g., congestion time or congestion size.

Depending on which performance criteria need to be evaluated, different models of evacuation calculation are recommended. A distinction is made between pedestrian flow simulations, flow models or hand calculation methods. Microscopic, space-continuous models, such as our crowd:it software, are the most informative, as they fulfill all requirements for the evaluation and visualization of evacuation scenarios.

Procedure for DIN 18009-2

The procedure is as follows: the protection goals and their specific criteria are determined; ideally, these are defined together with the examining authority. The evacuation calculations are analyzed and evaluated with regard to these criteria (see What for evacuation simulations). If the protection goals and their performance criteria are met, the planning can be released. If this is not the case, the planning must be revised and the analysis performed again. This can ensure that all persons can leave the building in a desired time.