Energy Conservation Through Improved Aerodynamics
Freestream Turbulence Effects on Galloping
Galloping is the term used to describe large amplitude single degree-of-freedom motions of a structure associated with a sectional aerodynamic force characteristic which produces a force...
Aerodynamic Response of Long H-Sections
Section models of several long H-section members of the Commodore Barry Bridge were tested in wind tunnels for aerodynamic coefficients and for vibration response when supported in a three...
Windspeed Analysis of 1977 Birmingham Tornado
A set of postmortem force-response type analyses have been conducted and windspeeds quantified for the April 4, 1977, North Birmingham, Ala. tornado. Immediate field damage surveys and...
Aerodynamics in Air Pollution Modeling
The mechanism of pollutant transport and dispersion processes in the atmosphere is described with emphasis on aerodynamic effects due to the presence of structures, urban complex, and...
Active Turbulence Generator for Study of Bridge Aerodynamics
Effect of Free-Stream Turbulence on Drag of Bluff Bodies
Free Fall of Large Pipes
The design of nuclear plant facilities to withstand the effects of tornadoes has required estimates of the motion of objects accelerated in a tornado windfield. This has inspired investigations...
Analytical Study of Suspension Bridge Flutter
A systematic procedure for investigating suspension bridge flutter is presented. As a prerequisite for flutter analysis the free vibration problem is considered first. The bridge is idealized...
Experimental Identification of Aerodynamic Forces
A semi-empirical method to assess aerodynamic forces acting on a two-dimensional bridge model is proposed. By integrating or differentiating numerically the acceleration or the displacement...
Effects of Turbulence on Bridge Flutter Derivatives
Bridge flutter derivatives have heretofore been obtained from models almost exclusively tested under oncoming laminar flow conditions. This paper demonstrates how a section model teest...
Natural Frequencies of Axially Loaded Bridge Members
The purpose of this paper is to present some formulas that can be used to check the aerodynamic stability of the more typical bridge members having two axes of symmetry. The principal...
Cable Equilibrium and Stability in a Steady Wind
A finite element representation for a cable subject to steady airflow is developed. Quasi-steady aerodynamics consisting of normal and tangential components is used. The model results...
Motion of Suspension Bridge Subject to Wind Loads
Vertical and torsional motions of a suspension bridge due to wind loading are studied. Both, self-excited, due to bridge motion, and buffeting, independent of bridge motion, wind loads...
Analytical Study of Suspension Bridge Flutter
Binary Flutter of Suspension Bridge Deck Sections
Wind tunnel experiments on models of suspension bridge deck sections with plate girders of various heights are made to show that binary flutter of suspension bridge deck sections can be...
Recent Aerodynamic Studies of Long-Span Bridges
Wind forces have taken on increased significance and can be a major problem in the design of cable-supported bridge systems. The determination of the response of long-span bridge structures...
Aerodynamic Investigations of In-Line Slender Towers
Aspects of Dynamic Stability of Structures
The dynamic nature of the transient of a structure from stability to instability is emphasized. The need to consider flutter and the paradoxical effect of mass distribution and damping...
Yaw Effects on Galloping Instability
Quasisteady theory of galloping oscillations of slender prismatic structures, such as transmission lines, stay cables, etc. is extended to cover flows approaching at a yaw angle. From...
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