Generally, the taller the structure the more important the role of wind. Yet most designers of tall building structures lack a basic understanding of the response of these structures to wind loading. Analysing the dynamic behaviour of existing flexible building structures under wind loading is essential for their management over a long service life. All of this requires knowledge and understanding beyond a traditional structural engineering background. This heavily practical book formalizes a great deal of information and understanding from the authors’ practice and their work in developing AISC, ACI and ASCE codes of practice.