Influence of Coupled Shear Wall Components on Structural Behaviour under Dynamic Loads
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Date
2017-06
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Addis Ababa University
Abstract
The growth of population density and shortage of land in urban areas are two major problems for all developing countries including Ethiopia. In order to mitigate these two problems, the designers resort to high-rise buildings, which are rapidly increasing in number, with various architectural configurations and ingenious use of structural materials. Shear walls are usually provided in tall buildings to avoid collapse of buildings under seismic forces. More often than not, such walls are pierced by numerous openings for windows, doors, service holes and other purposes. The effects of these openings on the stress distribution in the walls can be neglected if the openings are small. But in the case of larger openings, the wall could not work as one vertical element but as two or more coupled shear walls, depending on the number of rows of openings.
In this paper, a general formulation of the analysis of plane coupled shear walls is presented to investigate the behaviour of coupled shear walls subjected to lateral loads with more than one coupling beam in a story. The continuous medium method of analysis of coupled shear walls is reformulated with an additional beam parameter, number of connecting beams per story (nb).
First the behaviour of coupled shear wall has been studied and the equations for the system have been reformulated for the beam parameter in consideration. The corresponding charts are also developed for the structural responses in question. Based on the curves plotted an illustrative example is solved and comparisons are made with solution from Extended Three dimensional Analysis of Building Systems (ETABS 2015) output.
Finally the theory of the continuous medium method is extended to give an approximate solution to the natural frequency of the coupled shear wall system.
Key words: Coupled shear walls, Continuous medium method, Generalized Single Degree of Freedom systems, Natural frequency of coupled shear walls.
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Keywords
Coupled shear walls;Continuous medium method; Generalized Single Degree of Freedom systems; Natural frequency of coupled shear walls