Theoretical evaluation of evacuation lift capacity

Evacuation lift capacity assessments are a requirement of the London Plan Guidance which states buildings should “be designed to incorporate safe and dignified emergency evacuation for all building users”. Where designated in the approved Fire Strategy, lifts are able to be used for evacuation purposes and “a minimum of one lift per core, or more subject to capacity assessments” should be provided. This paper proposes a theoretical methodology to assess the evacuation lift capacity for a 34 storey development in London, with the assessment required by the buildings Fire Strategy in line with the London Plan Guidance. A phased evacuation strategy has been specified by the Fire Engineer and theoretical lift traffic analysis has been undertaken to estimate the total time to complete Phase 1 of the evacuation, for a series of fire floors throughout the building. This report will highlight the agreed assumptions for the development, total evacuation times, and provide information regarding the minimum required space-take for passengers who require lifts for evacuation within the refuge space provided in the protected lobby. This study serves as a benchmark for the building design and evacuation planning, emphasizing the importance of incorporating theoretical traffic analysis in the early stages of development to ensure safety and compliance with fire safety regulations.