caa a22 4500 467930996 CHVBK 20180406152943.0 cr unu---uuuuu 170328e20060801xx s 000 0 eng 10.1007/s10706-005-5035-9 doi (NATIONALLICENCE)springer-10.1007/s10706-005-5035-9 Centrifuge modelling-based verification of response spectra design methods for some vulnerable structures [Elektronische Daten] [S. Madabhushi, C. Lawson] Residential RC framed structures suffered heavily during the 2001 Bhuj earthquake in Gujarat, India. These types of structures also saw severe damage in other earthquakes such as the 1999 Kocaeli earthquake in Turkey and 921 Ji-Ji earthquake in Taiwan. In this paper the seismic response of residential structures was investigated using physical modelling. Idealised soft storey and top heavy, two degrees of freedom (2DOF) portal frame structures were developed and tested on saturated and dry sand models at 25g using the Schofield Centre 10-m Beam Centrifuge. It was possible to recreate observed field behaviour using these models. As observed in many of the recent earthquakes, soft storey structures were found to be particularly vulnerable to seismic loads. Elastic response spectra methods are often used in the design of simple portal frame structures. The seismic risk of these structures can be significantly increased due to modifications such as removal of a column or addition of heavy water tanks on the roof. The experimental data from the dynamic centrifuge tests on such soft storey or top-heavy models was used to evaluate the predictions obtained from the response spectra. Response spectra were able to predict seismic response during small to moderate intensity earthquakes, but became inaccurate during strong earthquakes and when soil structure interaction effects became important. Re-evaluation of seismic risk of such modified structures is required and time domain analyses suggested by building codes such as IBC, UBC or NEHRP may be more appropriate. Springer, 2006 centrifuge modelling nationallicence earthquakes nationallicence response Spectra nationallicence single and multi-storied buildings nationallicence Γ : Modal participation factor nationallicence r u : Excess pore pressure ratio nationallicence σ v ′ : Effective vertical stress nationallicence u : Measured pore pressure nationallicence u hydrostatic : Initial hydrostatic pore pressure nationallicence Madabhushi S. Schofield Centre, Department of Engineering, University of Cambridge, Trumpington Street, CB2 1PZ, Cambridge, UK aut Lawson C. Mott MacDonald, St Anne House,Wellesley Road, Croydon, UK aut Geotechnical & Geological Engineering Kluwer Academic Publishers 24/4(2006-08-01), 793-808 0960-3182 24:4<793 2006 24 10706 https://doi.org/10.1007/s10706-005-5035-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10706-005-5035-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Madabhushi S. Schofield Centre, Department of Engineering, University of Cambridge, Trumpington Street, CB2 1PZ, Cambridge, UK aut NATIONALLICENCE 700 1- Lawson C. Mott MacDonald, St Anne House,Wellesley Road, Croydon, UK aut NATIONALLICENCE 773 0- Geotechnical & Geological Engineering Kluwer Academic Publishers 24/4(2006-08-01), 793-808 0960-3182 24:4<793 2006 24 10706 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer