WIND-INDUCED VIBRATIONS OF CHIMNEYS USING AN IMPROVED QUASI-STEADY THEORY FOR GALLOPING

Aeroelastic phenomena play a very significant part in the design of la rge civil engineering structures. This paper deals with the interferen ce galloping occurring on in-line low rise 3D-shaped chimneys. The qua si-steady and 2D assumptions are not well adapted to this problem. A w eak quasi-steady model is introduced to improve the reliability of pre dictions. The originality of this work lies principally in its physica l interpretations and in the calculation of the time lag between aeroe lastic forces and structural deflection. The 3D nature of the problem is taken into account by using local pressure coefficients from wind t unnel tests. Some typical results are presented for cases where a crit ical wind velocity appears. (C) 1998 Elsevier Science Ltd. All rights reserved.