However, long travel down the stairs is slow compared to egress through corridors and exit passageways. Regarding egress, most high-rise buildings have relatively small floor areas making the travel distance to an exit stairway well within the limitations of the International Building Code (IBC). The “safety” aspect is a braking device that would stop the elevator cab should it drop uncontrollably from equipment or cable failure.įrom a life safety perspective, the high-rise poses unique situations not found in buildings of lower height. The safety elevator provided a rapid means of travel to the upper floors without having to use stairs. Steel frame construction acts like a skeleton upon which the lighter weight building skin is attached. Steel frame construction allowed buildings of great height without the use of loadbearing walls, since this would have required thick walls at the base that would have rendered the lower stories useless. The modern high-rise rose to prominence when two significant developments were achieved: steel frame construction and the safety elevator. The purpose of the modern high-rise building is to maximize building area in the smallest lot area. Although these were tall structures, they did not perform the same functions that today’s modern high-rise does. The Towers of Bologna, constructed in the 12 th Century AD, topped out at about 320 feet for the tallest tower. The Great Pyramid of Giza, built in the 26 th Century BC, was as high as 480 feet high. Tall structures have been in existence for centuries.
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