- Prediction of Higher-Mode Response of Tall RC Wall Buildings
- D. Pennucci ; T.J. Sullivan ; G.M. Calvi
- Book Title / Journal: Proceedings of the 15th World Conference on Earthquake Engineering, Lisbon, Portugal
- Year: 2012 , Volume: , Series:
- Earthquake engineering
- Keywords: performance-based design ; tall buildings ; higher-mode response
- Recent years have seen a great expansion of the tall building industry, even in areas characterised by high seismicity. With the increase of structural height, the importance of higher-modes in the dynamic response of buildings becomes predominant. However, the effects that ductility has on the response of higher-modes is not yet well understood, and traditional design procedures, based on response spectrum analysis, do not allow for an accurate estimation of higher-mode response of ductile systems. In this study a new approach for estimating the ductile higher-mode response is presented. The procedure consists of a modal analysis combination based on the so-called “substitute structure method”, in which structural properties are suitably modified to account for the
effects of ductility development. The method requires only elastic analysis and can be easily implemented at early stages of design. The proposed approach is validated against the results of an extensive non-linear time history investigation in which several RC wall systems are analysed. It is shown how the proposed methodology gives an improved prediction over the most traditional response spectrum approach for a wide range of different structural parameters and without a significant increase in computational requirements.