I would like to remind you about the research talk that will take place this afternoon, between 14:30 and 15:30, in room Professor Joaquim Sarmento. The talk will be delivered by Prof. Nouredine Bourahla from University Saad Dahlab Blida1 (Algeria) and will be entitled:
"Seismic accidental eccentricity: Origins, Effects and Evaluation"
Below you can find a summary of the talk along with a short biography of Prof. Bourahla.
Seismic accidental eccentricity: Origins, Effects and Evaluation
Prof. Nouredine Bourahla
University Saad Dahlab Blida1, Algeria
Seismic codes specify the accidental eccentricity as a percentage (5% or 10%) of the building dimension perpendicular to the direction of excitation, to account for the uncertainties and errors in evaluating the mass and stiffness centres of the building floors and the earthquake rotational component. Because of the random and uncertain nature of the factors responsible for the accidental eccentricity, it is very difficult or impossible to evaluate explicitly and accurately its effect on the total seismic response of constructions. The main objective of this talk is to define the major factors contributing to the accidental eccentricity and how the modern seismic codes are dealing with it. Several approaches to assess the effect of some of these factors such as the stiffness and strength uncertainties and the rotational component of the earthquake ground motion or the global eccentricity using artificial neural networks are presented.
Nouredine Bourahla is a Professor of structural dynamics and earthquake engineering and head of the doctoral school of the civil engineering department at the University Saad Dahlab, Blida1, Algeria.
After graduating from ENP Algiers (Ecole National Polytechnique d’Ager), he joined Bristol University (UK) where he completed a PhD in 1990. At the Earthquake Engineering Research Centre (EERC, Bristol) he was heavily involved in seismic small-scale testing of steel frames on the six axis shaking table. He was also involved in data processing of seismic qualification testing. Beside the research activity, he performed teaching activity as tutor of strength of materials and structural computer aided learning for undergraduate students.
In 1991 he joined the University of Blida (Algeria) as a lecturer, where he founded a research team and build up a resource of tools for full-scale ambient vibration testing of buildings. The interest in structural dynamics continued and extended to the use of neural networks to extract structural responses from recorded signals. In 2003, he received the T.K. Shieh award from the Institution of Civil Engineers (UK) as a co-author of a publication on seismic behaviour of knee bracing system. Since 2009, he has been working on cold formed steel to help the implementation of the newly constructed CFS buildings in Algeria.
As specialist consultant he has worked on numerous engineering projects such as the design and construction of a world class earthquake laboratory having a 6m x 6m six axis shaking table.
Professor Bourahla is a member of the scientific board of the national earthquake engineering centre in Algiers and he is a member of the national committee of the seismic code of buildings and bridges.