Society for Earthquake and Civil Engineering Dynamics
Welcome to the website of the Society for Earthquake and Civil Engineering Dynamics (SECED). SECED was founded in 1969 to promote the study and practice of earthquake engineering and structural dynamics, including blast, impact, and other vibration problems. SECED is also concerned with the study of societal and economic ramifications of major earthquakes.
We are delighted to announce that Joe Gervin from Ireland is the winner of the SECED logo competition. Joe's design is shown here on the right (one version out of many). We would like to thank everyone who submitted one or more entries. We received many interesting designs, and it was not an easy task to choose the winner. In fact, it was a very close race between the finalists in the competition. We would also like to give a special commendation to three entries submitted by young people under the age of 18: all three were very accomplished designs. However, in the end the Committee felt that Joe's entry was the best design. We will now begin the process of incorporating the new logo into our website, newsletter and other promotional material.
We are also delighted to announce that Prof Julian Bommer has agreed to deliver the 17th Mallet-Milne Lecture. The lecture will provide insights from Julian's 35 years of experience in seismic hazard studies. The lecture was scheduled to take place in May 2021. However, following consultation with Julian, we have decided to postpone the event until June 2022. We have taken this decision because we believe that the Mallet-Milne Lecture should be delivered in front of a live audience. We consider that the performative, celebratory and social dimensions of the Mallet-Milne Lecture are essential, and we do not see how we can replicate those dimensions in an online event. For that reason, we hope that Julian will be able to deliver the Mallet-Milne Lecture in person in June 2022, and that the Covid-19 pandemic will be a memory of the past at that point in time.
Our usual evening meetings at the ICE headquarters in London are suspended due to the ongoing Covid-19 crisis. Instead, our meetings have moved online. Head to the Events section to see a list of upcoming events.
This study presents a methodology for selecting and scaling real earthquake ground motions to be used in the estimation of nonlinear structural response. The proposed procedure explicitly considers the uncertainty in the target intensity measure with the level of spectral variability preserved in the ground motion suite. The candidate ground motion sets are constructed based on dispersion statistics about the target spectral demand. The optimum ground-motion set is linearly scaled by using an optimization algorithm that minimizes the error between scaled median and target spectra. The scaling stage ensures that the median record spectrum provides a reasonable match to target median in a previously defined period interval. The effect of the spectral variability on seismic demand estimations is investigated using various inelastic single degree of freedom structural systems. In order to investigate the impact of different selection and scaling methodologies on nonlinear structural response, the results are compared with those obtained by the Conditional Spectrum (CS) based scaling methodology. The variability in the nonlinear structural response due to the use of different numbers of scaled recordings are also examined with the aim of finding optimum number of ground motions for reliable and stable estimation of nonlinear structural behavior.
SECED is the British branch of both the International Association and the European Association of Earthquake Engineering. SECED is an Associated Society of the Institution of Civil Engineers (ICE) and is sponsored by the Institution of Mechanical Engineers (IMechE), the Institution of Structural Engineers (IStructE) and The Geological Society.