SUMMARYSeismic hazard disaggregation is commonly used as an aid in ground-motion selection for the seismic response analysis of structures. This short communication investigates two different approaches to disaggregation related to the exceedance and occurrence of a particular intensity. The impact the different approaches might have on a subsequent structural analysis at a given intensity is explored through the calculation of conditional spectra. It is found that the exceedance approach results in conditional spectra that will be conservative when used as targets for ground-motion selection. It is however argued that the use of the occurrence disaggregation is more consistent with the objectives of seismic response analyses in the context of Performance-Based Earthquake Engineering.
Acknowledgements: The authors would like to thank Professor Nigel Priestley for his input at various stages of this research. The first author would also like to acknowledge the funding provided by the MEEES programme (www.meees.org).Capacity design aims to ensure controlled ductile response of structures when subjected to earthquakes. This research investigates the performance of existing capacity design equations for reinforced concrete coupled walls and then proposes a new simplified capacity design method based on state-of-the-art-knowledge. The new method is verified through a case study in which a set of 15 coupled walls are subject to non-linear time-history analyses. The work includes examination of the maximum shear force in individual walls in relation to the total maximum shear force in the coupled wall system, and subsequently provides recommendations for design.
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