Rated Load and Maximum Available Car Area. A Proposal to Revise EN81-20, Table 6

Gina Barney

Wednesday 21st September 2022

In the USA during the 1920s, concerns were expressed that large lifts were being overloaded owing to the lift attendants in the cars pushing passengers into their cars. On group systems this was aggravated by the human despatchers forcing passengers into the cars. The result was the density of the passenger load increased as the cars got bigger. Non-domestic buildings were designed in the USA for a uniformly distributed load of 60 pound per square foot (psf) on open areas of building floors and this was used for lift car floors. To ensure passenger safety the load bearing was increased to 100psf for lifts carrying 10,000lb (A17.1:1925), and in 1937 to 127.5psf (A17.1:1937) for lifts carrying 37,500lb. This resulted in a nonlinear relationship between passenger load and the available car area on which they stand. This can be seen in Table 6 of BS EN81-20:2020/BS ISO8100-1:2019. NOTE 1: Whenever EN81-20 is referred to in this paper it means: BS EN81-20:2020/BS ISO8100-1:2019 Societal changes, where individuals do not tolerate the discomfort of other individuals intruding into their personal space; and technological advances in load weighing, demands a reconsideration of the space a passenger occupies and its corresponding rated load. A proposal to revise the relevant standards is presented. The concept of a Body Area Index is introduced to allow for a wide range of body weights across the world. NOTE 2: Imperial measures are referred to and these may be converted as one pound (lb) = 0.454 kg and one square foot (sf) = 0.093 m2.

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