ABSTRACT
This chapter indicates how the round trip time equation might need to be changed to deal with a number of special situations. Such situations will be discussed with respect to considerations by lift function, building form and building function. For example a firefighting lift (lift function) installed in a tall building (building form) used as a hospital (building function). The target equation is Equation (4.11):
8.2CONSIDERATION BY LIFT FUNCTIONS
8.2.1Shuttle Lifts (with sky lobbies)
Many tall buildings are divided into several zones: low zone, mid zone, high zone, etc., with service direct from the main terminal floor, situated at ground level. These are called “local” zones. This becomes impractical with very tall buildings of 70 stories or more and shuttle lifts are employed (Schroeder, 1989b) to take passengers from the ground level main lobby to a “sky lobby” (Browne and Kelly, 1968). Passengers disembark at the sky lobby and then take the local lifts to their final destination. Service is then provided to further low, mid, high zones, etc. using the sky lobby as an upper main terminal floor. The advantage is that the core efficiency is improved (Fortune, 1995, 1996), as the hoistways extend the whole height of the building (except for the intervening equipment spaces) and occupy the same hoistway “footprint”. Sometimes passengers travel down from the sky lobby as well as up (Fortune, 1986, 1990). Most shuttle lifts are single deck, but there are a number of double deck installations. Schroeder (1989a) defines four basic sky lobby configurations:
1. Single deck shuttles, single deck locals, eg: World Trade Center. 2. Double deck shuttles, single deck locals, eg: Sears Tower. 3. Double deck shuttles, double deck locals, eg: Petronas Towers. 4. Single deck shuttles, single deck top/down locals, eg: none.
