Quasisteady theory in aerodynamics of slender structures

A systematic and multi-aspect way of presenting the basis of the quasisteady theory of constructing mathematical models of wind load on slender structures is given in this paper. These models take into account both the influence of wind velocity fluctuations and wind direction fluctuations in front of the structure as well as transverse i.e. along- and across-wind vibrations and torsional vibrations of the structure itself. In these models neither velocity nor wind direction are local quantities but spatially averaged quantities from a characteristic for a given structure averaging area located in front of the structure. The paper consist of three parts. Parts I and II concern the basis of the quasisteady theory for a motionless and vibrating structure, respectively. Part III concerns practical applications. Analysis of chosen particular cases of wind load on slender structures and chosen problems of dynamic analysis of slender tower-shaped structures under wind load are presented in it. In part I, moreover, a list is given for comparative purposes of various aerodynamic coefficients occurring in the quasisteady theory, elaborated on the basis of numerous results of investigations in wind tunnels carried out by various researchers. Difficulties occurring in practice in determining values of aerodynamic coefficients basing upon investigation results are also discussed. Many solutions from part I and III are illustrated with examples. (orig.)SIGLEAvailable from TIB Hannover: RO 1209(25) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Numerical stability analysis of arbitrary structural responses

The present work is concerned with the development of algorithms for numerical stability investigations of stationary and unstationary solutions of nonlinear systems of ordinary differential equations, which determinate the behaviour of mechanical structures. The stability concepts of characteristic exponents and characteristic multipliers based on Lyapunow's first method are analyzed, and their connection with stability assessments utilizing Lyapunow exponents is demonstrated. The proceeding for the determination of Lyapunow exponents is discussed to deduce an alternative numerical concept for stability investigation of time-dependently loaded, multi-dimensional structures. (WEN)SIGLEDEGerman

Sonderforschungsbereich 151 - Tragverhalten und Tragfaehigkeit von Baukonstruktionen unter dynamischen Einwirkungen der Ruhr-Universitaet Bochum. Forschungsprogramm 1992/1994

SIGLEAvailable from TIB Hannover: RO1209(21) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Arbeitsbericht fuer die Jahre 1983/85. Forschungsprogramm 1986/88. Sonderforschungsbereich Tragwerksdynamik, Ruhr-Universitaet Bochum

SIGLETIB: RO 1209 (4) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Sonderforschungsbereich 151 - Tragverhalten und Tragfaehigkeit von Baukonstruktionen unter dynamischen Einwirkungen der Ruhr-Universitaet Bochum. Arbeitsbericht fuer die Jahre 1989/1991

SIGLEAvailable from TIB Hannover: RO1209(20) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Linear and nonlinear analysis of profiled steel shear panel action in vibrating framed structures

SIGLEAvailable from TIB Hannover: RO1209(22) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Fast online earthquake simulation of friction-damped systems

SIGLEAvailable from TIB Hannover: RO 1209(15) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Erschuetterungs-Uebertragungsverhalten von Stahlbetonbauteilen unter extremen Stossbeanspruchungen

SIGLECopy held by UB/TIB Hannover / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Dynamische Stabilitaetsanalyse elasto-viskoplastischer Flaechentragwerke unter zeitvarianten Einwirkungen

SIGLEAvailable from TIB Hannover: RA3043(92-2) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

SSI-FEBEM: A computer program for dynamic soil-structure interaction analysis using finite element and boundary element methods

Available from TIB Hannover: RO 1209(18) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman