Dynamics Of Lightweight Roofs

TL;DRAbstract

The use of lightweight roofs for long span structures has become popular. Architects find these structures attractive because they allow for a wide scope of innovative design, and can be cost effective and aesthetically pleasing. Although extensive research has already been devoted to many aspects of lightweight structures, this thesis examines the effects of wall openings on self-supported roofs backed by cavities, the nature of the response of air-supported roofs to turbulent wind, and theoretical methods for response prediction.;The first part of the study comprises a free vibration analysis of self-supported, lightweight roofs backed by cavities with openings. A simplified theoretical approach is formulated to evaluate the modal parameters of the roof-air system considering air leakage through the openings, the pneumatic stiffness, and the structural and acoustical damping of the system. The accuracy of the approximate formulae is assessed by comparison with a complex eigenvalue an

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