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Earthquakes and Structures
  Volume 15, Number 1, July 2018, pages 81-95

Methods of analysis for buildings with uni-axial and bi-axial asymmetry in regions of lower seismicity
Elisa Lumantarna, Nelson Lam and John Wilson

    Most buildings feature core walls (and shear walls) that are placed eccentrically within the building to fulfil architectural requirements. Contemporary earthquake design standards require three dimensional (3D) dynamic analysis to be undertaken to analyse the imposed seismic actions on this type of buildings. A static method of analysis is always appealing to design practitioners because results from the analysis can always be evaluated independently by manual calculation techniques for quality control purposes. However, the equivalent static analysis method (also known as the lateral load method) which involves application of an equivalent static load at a certain distance from the center of mass of the buildings can generate results that contradict with results from dynamic analysis. In this paper the Generalised Force Method of analysis has been introduced for multi-storey buildings. Algebraic expressions have been derived to provide estimates for the edge displacement ratio taking into account the effects of dynamic torsional actions. The Generalised Force Method which is based on static principles has been shown to be able to make accurate estimates of torsional actions in seismic conditions. The method is illustrated by examples of two multi-storey buildings. Importantly, the black box syndrome of a 3D dynamic analysis of the building can be circumvented.
Key Words
    generalised force method; static analysis method; plan irregularity; torsion
Elisa Lumantarna: Department of Infrastructure Engineering, The University of Melbourne, Parkville 3030, Victoria, Australia; Bushfire and Natural Hazards Cooperative Research Centre, Melbourne Australia
Nelson Lam and John Wilson: Swinburne University of Technology, Sarawak Campus, Kuching, Sarawak, Malaysia; Bushfire and Natural Hazards Cooperative Research Centre, Melbourne Australia

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