Dynamic along-wind response of simple structures

The paper presents three essential modifications of the current analysis of the dynamic along-wind response of simple structures. It is demonstrated that the consistency requirement of zero mean turbulent flow leads to a reduction of the high-frequency response. A simple representation of the joint acceptance function via an accurate explicit approximation to the two-dimensional area of the joint acceptance integral of the cross-spectrum is presented.

The total response is obtained from superposition of a quasistatic and a modal part. The new proposals are presented as an integral part of a critical appraisal of basis of analysis of dynamic along-wind response, suggesting that the turbulence length-scale is adequately represented by a simple power function of height.

The results are summarised in the form of a design procedure, illustrated by examples.