Theory of Bridge Aerodynamics

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This text book is intended for studies in wind engineering, with focus on the stochastic
theory of wind induced dynamic response calculations for slender bridges or other
line−like civil engineering type of structures. It contains the background assumptions
and hypothesis as well as the development of the computational theory that is necessary
for the prediction of wind induced fluctuating displacements and cross sectional forces.
The simple cases of static and quasi-static structural response calculations are for the
sake of completeness also included.
The text is at an advanced level in the sense that it requires a fairly comprehensive
knowledge of basic structural dynamics, particularly of solution procedures in a modal
format. None of the theory related to the determination of eigen−values and the
corresponding eigen−modes are included in this book, i.e. it is taken for granted that the
reader is familiar with this part of the theory of structural dynamics. Otherwise, the
reader will find the necessary subjects covered by e.g. Clough & Penzien [2] and
Meirovitch [3]. It is also advantageous that the reader has some knowledge of the theory
of statistical properties of stationary time series. However, while the theory of structural
dynamics is covered in a good number of text books, the theory of time series is not, and
therefore, the book contains most of the necessary treatment of stationary time series
(chapter 2).
The book does not cover special subjects such as rain-wind induced cable vibrations.
Nor does it cover all the various available theories for the description of vortex shedding,
as only one particular approach has been chosen. The same applies to the presentation of
time domain simulation procedures. Also, the book does not contain a large data base for
this particular field of engineering. For such a data base the reader should turn to e.g.
Engineering Science Data Unit (ESDU) [7] as well as the relevant standards in wind and
structural engineering.
The writing of this book would not have been possible had I not had the fortune of
working for nearly fifteen years together with Professor Erik Hjorth–Hansen on a
considerable number of wind engineering projects.
The drawings have been prepared by Anne Gaarden. Thanks to her and all others who
have contributed to the writing of this book.

เครดิตไฟล์ :

Professor Dr. Einar N. Strømmen
Department of Structural Engineering
Norwegian University
of Science and Technology
7491 Trondheim, Norway
E-mail: einar.strommen@ntnu.no

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