Tall Buildings and Urban Habitat: Cities in the Third Millennium

By Council On Tall Buildings And Urban Habitat | Go to book overview

DESIGN CRITERIA AND LOADS


New CTBUH Monograph on Building Motion, Perception and Mitigation

N. Isyumov and T. Tschanz


ABSTRACT

This paper provides an overview of the new Monograph which deals with motions experienced by tall buildings and their impact on design. Of various types of building motions wind-induced vibrations are of greatest concern to designers since they can occur relatively frequently and are difficult to control and mitigate. The Monograph also treats floor vibrations caused by pedestrian traffic, in recognition of their importance for the satisfactory performance of buildings. The new Monograph includes recent findings of controlled "moving room" experiments and deals with the response of human to motions in actual buildings. This includes results by researchers from North America, Japan, Australia, Europe and other parts of the world. Methodologies for predicting wind-induced accelerations of tall buildings are presented and criteria used for their evaluation are discussed. Measures for reducing the wind-induced dynamic motions of tall buildings are discussed. These include the effects of altering the dynamic properties of tall buildings, notably their effective damping, as well as possible modifications to their aerodynamic characteristics, in order to reduce the wind-induced dynamic forces.

Finally, while significant progress has been made since the 1980 edition of this Monograph, many questions about how to predict, evaluate and if necessary mitigate wind-induced and other types of building motion still remain. While the need to limit motions of tall buildings is universally recognized there is still incomplete consensus on how to best gauge acceptable performance. As a result, different points of view are presented to express the diversity of practice in different parts of the world.


1.0 OVERVIEW

Motions can become perceptible and potentially unacceptable in situations where the response of buildings and other occupied structures to the action of external loads has a significant dynamic or oscillatory component. Oscillatory

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