| Summary: | 碩士 === 國立中央大學 === 土木工程學系 === 101 === Coupled walls are often used in mid- to high-rise structural systems to provide adequate lateral stiffness and strength to resist earthquakes. A coupled wall is composed by two or more structural walls connected by coupling beams. It has been shown that coupled walls are able to effectively reduce the drift response and overturning moment that a structure experiences during earthquakes. Under the action of an earthquake, coupling beams have to provide sufficient strength in order to transmit large forces between walls. In addition, coupling beams have to be designed with high ductility since they are expected to undergo large deformation reversals under earthquakes. In order to discuss the influence of different designs of coupling beams on the seismic behavior of coupled walls, the paper presented herein designs a series of coupled wall systems with different coupling ratios; coupling ratio is defined as a ratio of the additional moment resistance generated by coupling actions to the overall overturning moment. It is found that for coupled walls with low coupling ratios, their lateral stiffness will decrease substantially as soon as coupling beams yield. On the other hand, the coupled walls that are designed with high coupling ratios have several beneficial effects. For example, while the material used can be reduced, their stiffness is able to maintain at a relatively higher level as coupling beams start to yield. Nevertheless, detrimental effects are also found for coupled walls with high coupling ratios. Based on the analysis results, the paper suggests an appropriate range of coupling ratios for coupled walls with different heights.
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