![]() ![]() The refined method requires knowledge of the torsional stiffness properties to be known, whereas the detailed method requires the eccentricity properties to be known as well. The quick method provides predictions of the 3D/2D ratio and only requires the gross plan dimensions of the building to be known. ![]() The estimate can be used for verifying results reported from a computer package conveniently. This article presents a three-tiered approach of estimating the displacement behaviour of the building in term of 3D/2D displacement ratio. As a result of challenges in dealing with real multi-storey buildings, there has been very limited uptake of research findings in design practices. Much of the published technical articles present findings for buildings based on an idealised single-storey model. Whilst most design practices are well equipped with commercial software for undertaking such analyses, designers often find it difficult to verify results. Building codes of practices typically recommend the use of three-dimensional dynamic analysis to determine the seismic demands of a multi-storey building. Buildings possessing an asymmetrical arrangement of structural elements are torsionally unbalanced and can be vulnerable in a seismic event. ![]()
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