Role of Indicial Functions in Buffeting Analysis of Bridges

Abstract

The problem of the wind buffeting of bluff bodies, in this instance bridge decks, is reexamined in the present paper from the standpoint of linearized theory. The links of flutter derivatives to aerodynamic indicial functions are first recalled and extended. The possibility that these functions offer of simplifying investigative aerodynamic tests of bridge models is discussed. Finally, the gust response problem is set up for a two‐dimensional model in the time domain, employing aerodynamic indicial functions. The equations are then Fourier transformed to the frequency domain, preserving in the process the correct relations between the frequency‐dependent flutter coefficients and the aerodynamic buffeting force spectra. Methods for estimating maximal excursions of the model are then recalled. The paper offers a theoretical framework for future wind tunnel model investigations under turbulent flow.