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


Analysis and Model Techniques for Determining Dynamic Behaviour of Civil Structures with Various Damping Systems

B. Breukelman, T. Haskett, S. Gamble and P. Irwin


1 INTRODUCTION

Controlling vibrations of structures through the use of damping systems continues to increase as structures become lighter and more slender. This includes buildings, towers, vehicular bridges and pedestrian bridges. As a result, the tools used for design of these supplemental damping systems need to take into account the nature of the applied loads to get a more accurate determination of the way the structure will behave with the damping system.

Wind tunnel testing to determine the wind-induced forces on structures has been common for many years. It is common for significant buildings and towers to have wind tunnel testing performed, beginning with the High-Frequency Force-Balance (HFFB) test and occasionally an aeroelastic wind tunnel test is performed to better determine aeroelastic effects such as aerodynamic damping and vortex-induced phenomena. Detailed knowledge of the nature of the wind-induced forces can be used with advanced analysis techniques to accurately describe the behaviour of a supplemental damping system. In addition to wind-induced forces, it may be necessary to consider seismic forces if the structure is located in a region with seismic activity.

To date, damping systems which have been implemented to reduce vibrations of structures have been primarily designed using frequency domain analysis techniques. Beginning with the work of Den-Hartog (1956), many have produced estimates of effective damping of a damped structure and reduction in motion and amplitudes of the damping system. Computing limitations have limited the ability to perform time-domain analysis of the combined structure and damping system. More recently, software commonly available to structural

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